ZamzamKit alternatives and similar libraries

ZamzamKit

ZamzamKit is a Swift package for rapid development using a collection of micro utility extensions for Standard Library, Foundation, and other native frameworks.

Installation

Swift Package Manager

.package(url: "[email protected]:ZamzamInc/ZamzamKit.git", .upToNextMajor(from: "5.1.0"))

The ZamzamKit package contains four different products you can import. Add any combination of these to your target's dependencies within your Package.swift manifest:

.target(
    name: "MyAppExample",
    dependencies: [
        .product(name: "ZamzamCore", package: "ZamzamKit"),
        .product(name: "ZamzamLocation", package: "ZamzamKit"),
        .product(name: "ZamzamNotification", package: "ZamzamKit"),
        .product(name: "ZamzamUI", package: "ZamzamKit"),
    ]
)

A limitation with Swift Package Manager requires resources to be embedded manually. Drag /Resources/ZamzamCore.bundle to your Xcode project's Build Phases > Copy Bundle section.

ZamzamCore

Standard+

Collection

Get distinct elements from an array:

[1, 1, 3, 3, 5, 5, 7, 9, 9].distinct // [1, 3, 5, 7, 9]

Remove an element from an array by the value:

var array = ["a", "b", "c", "d", "e"]
array.remove("c")
array // ["a", "b", "d", "e"]

Easily get the array version of an array slice:

["a", "b", "c", "d", "e"].prefix(3).array

Safely retrieve an element at the given index if it exists:

// Before
if let items = tabBarController.tabBar.items, items.count > 4 {
    items[3].selectedImage = UIImage("my-image")
}

// After
tabBarController.tabBar.items?[safe: 3]?.selectedImage = UIImage("my-image")

[1, 3, 5, 7, 9][safe: 1] // Optional(3) [1, 3, 5, 7, 9][safe: 12] // nil

> Determine if a value is contained within the array of equatable values:
```swift
"b".within(["a", "b", "c"]) // true

let status: OrderStatus = .cancelled
status.within([.requested, .accepted, .inProgress]) // false

Dictionary

Convert to JSON string or data:

// Before
guard let data = try? JSONSerialization.data(withJSONObject: merged, options: []),
    let log = String(data: data, encoding: .utf8) else {
        return
}

// After guard let log = merged.jsonString else { return }

</details>

<details>
<summary>Number</summary>

> Round doubles, floats, or any floating-point type:
```swift
123.12312421.rounded(toPlaces: 3) // 123.123
Double.pi.rounded(toPlaces: 2) // 3.14

String

Create a new random string of given length:

String(random: 10) // "zXWG4hSgL9"
String(random: 4, prefix: "PIN-") // "PIN-uSjm"

Safely use subscript indexes and ranges on strings:

let value = "Abcdef123456"
value[3] // "d"
value[3..<6] // "def"
value[3...6] // "def1"
value[3...] // "def123456"
value[3...99] // nil
value[99] // nil

Validate string against common formats:

"[email protected]".isEmail // true
"123456789".isNumber // true
"zamzam".isAlpha // true
"zamzam123".isAlphaNumeric // true

Remove spaces or new lines from both ends:

" Abcdef123456 \n\r  ".trimmed // "Abcdef123456"

Truncate to a given number of characters:

"Abcdef123456".truncated(3) // "Abc..."
"Abcdef123456".truncated(6, trailing: "***") // "Abcdef***"

Determine if a given value is contained:

"1234567890".contains("567") // true
"abc123xyz".contains("ghi") // false

Injects a separator every nth characters:

"1234567890".separated(every: 2, with: "-") // "12-34-56-78-90"

Remove the characters contained in a given set:

let string = """
    { 0         1
    2                  34
    56       7             8
    9
    }
    """

string.strippingCharacters(in: .whitespacesAndNewlines) // {0123456789}

> Replace the characters contained in a givenharacter set with another string:
```swift
let set = CharacterSet.alphanumerics
    .insert(charactersIn: "_")
    .inverted

let string = """
    _abcdefghijklmnopqrstuvwxyz
    ABCDEFGHIJKLMNOPQRSTUVWXYZ
    0{1 2<3>[email protected]#6`7~8?9,0

    1
    """

string.replacingCharacters(in: set, with: "_") //_abcdefghijklmnopqrstuvwxyz_ABCDEFGHIJKLMNOPQRSTUVWXYZ_0_1_2_3_4_5_6_7_8_9_0__1

Match using a regular expression pattern:

"1234567890".match(regex: "^[0-9]+?$") // true
"abc123xyz".match(regex: "^[A-Za-z]+$") // false

Replace occurrences of a regular expression pattern:

"aa1bb22cc3d888d4ee5".replacing(regex: "\\d", with: "*") // "aa*bb**cc*d***d*ee*"

Remove HTML for plain text:

"<p>This is <em>web</em> content with a <a href=\"http://example.com\">link</a>.</p>".htmlStripped // "This is web content with a link."

Encoders and decoders:

value.urlEncoded()
value.urlDecoded()
value.htmlDecoded()
value.base64Encoded()
value.base64Decoded()
value.base64URLEncoded()

Get an encrypted version of the string in hex format:

"[email protected]".sha256() // 973dfe463ec85785f5f95af5ba3906eedb2d931c24e69824a89ea65dba4e813b

Easily get the string version of substring:

"hello world".prefix(5).string

Determine if an optional string is nil or has no characters

var value: String? = "test 123"
value.isNilOrEmpty

Foundation+

Bundle

Get the string from a file within any bundle:

Bundle.main.string(file: "Test.txt") // "This is a test. Abc 123.\n"

Get a generic array from a property list file within any bundle:

let values: [String] = Bundle.main.array(plist: "Array.plist")

values[0] // "Abc"
values[1] // "Def"
values[2] // "Ghi"

[Image of BundleArray](./Documentation/Images/BundleArray.png)

let values: [[String: Any]] = Bundle.main.array(plist: "Things.plist")

values[0]["id"] as? Int // 1
values[0]["name"] as? String // "Test 1"
values[0]["description"] as? String // "This is a test for 1.")

values[1]["id"] as? Int // 2)
values[1]["name"] as? String // "Test 2")
values[1]["description"] as? String // "This is a test for 2.")

values[2]["id"] as? Int // 3)
values[2]["name"] as? String // "Test 3")
values[2]["description"] as? String // "This is a test for 3.")

[Image of BundleArray](./Documentation/Images/BundleArray2.png)

Get a dictionary from a property list file within any bundle:

let values: [String: Any] = Bundle.main.contents(plist: "Settings.plist")

values["MyString1"] as? String // "My string value 1." values["MyNumber1"] as? Int // 123 values["MyBool1"] as? Bool // false values["MyDate1"] as? Date // 2018-11-21 15:40:03 +0000

![Image of BundleDictionary](./Documentation/Images/BundleDictionary.png)
</details>

<details>
<summary>Color</summary>

> Additional color initializers:
```swift
UIColor(hex: 0x990000)
UIColor(hex: 0x4286F4)
UIColor(rgb: (66, 134, 244))
UIColor.random

Currency

A formatter that converts between numeric values and their textual currency representations:

let formatter = CurrencyFormatter()
formatter.string(fromAmount: 123456789.987) // "$123,456,789.99"

let formatter2 = CurrencyFormatter(for: Locale(identifier: "fr-FR")) formatter2.string(fromCents: 123456789) // "1 234 567,89 €"

</details>

<details>
<summary>Data</summary>

> Get a hex string representation of the data:
```swift
Data()?.hexString() // 68626a4a424a6a68626a68616420663773376474663720737567796f3837545e49542a69797567

Get an encrypted version of the data:

Data()?.sha256()

Date

Determine if a date is in the past or future:

Date(timeIntervalSinceNow: -100).isPast // true
Date(timeIntervalSinceNow: 100).isPast // false

Date(timeIntervalSinceNow: 100).isFuture // true Date(timeIntervalSinceNow: -100).isFuture // false

> Determine if a date is today, yesterday, or tomorrow:
```swift
Date().isToday // true
Date(timeIntervalSinceNow: -90_000).isYesterday // true
Date(timeIntervalSinceNow: 90_000).isTomorrow // true

Determine if a date is within a weekday or weekend period:

Date().isWeekday // false
Date().isWeekend // true

Get the beginning or end of the day:

Date().startOfDay // "2018/11/21 00:00:00"
Date().endOfDay // "2018/11/21 23:59:59"

Get the beginning or end of the month:

Date().startOfMonth // "2018/11/01 00:00:00"
Date().endOfMonth // "2018/11/30 23:59:59"

Determine if a date is current:

let date = Date(fromString: "2018/03/22 09:40")
date.isCurrentWeek
date.isCurrentMonth
date.isCurrentYear

Determine if a date is between two other dates:

let date = Date()
let date1 = Date(timeIntervalSinceNow: 1000)
let date2 = Date(timeIntervalSinceNow: -1000)

date.isBetween(date1, date2) // true

> Determine if a date is beyond a specified time window:
```swift
let date = Date(fromString: "2018/03/22 09:40")
let fromDate = Date(fromString: "2018/03/22 09:30")

date.isBeyond(fromDate, bySeconds: 300) // true
date.isBeyond(fromDate, bySeconds: 1200) // false

Use specific calendar for data manipulations:

let date = Date(fromString: "2018/03/22 09:40")
let calendar = Calendar(identifier: .chinese)

date.isToday(for: calendar) date.isWeekday(for: calendar) date.isCurrentMonth(for: calendar) date.isToday(for: calendar) date.startOfDay(for: calendar) date.startOfMonth(for: calendar)

> Determine if a date is beyond a specified time window:
```swift
let date = Date(fromString: "2018/03/22 09:40")
let fromDate = Date(fromString: "2018/03/22 09:30")

date.isBeyond(fromDate, bySeconds: 300) // true
date.isBeyond(fromDate, bySeconds: 1200) // false

Create a date from a string:

Date(fromString: "2018/11/01 18:15")
Date(fromString: "1440/03/01 18:31", calendar: Calendar(identifier: .islamic))

Format a date to a string:

Date().string(format: "MMM d, h:mm a") // "Jan 3, 8:43 PM"
Date().string(style: .full, calendar: Calendar(identifier: .hebrew)) // "Friday, 1 Kislev 5779"
Date().string(formatter: .MM_dd_yyyy_HH_mm)

Format a time interval to display as a timer.

let date = Date(fromString: "2016/03/22 09:45")
let fromDate = Date(fromString: "2016/03/22 09:40")

date.timerString(from: fromDate)

// Prints "00:05:00"

> Get the decimal representation of the time:
```swift
Date(fromString: "2018/10/23 18:15").timeToDecimal // 18.25

Increment years, months, days, hours, or minutes:

let date = Date()
date + .years(1)
date + .months(2)
date - .days(4)
date - .hours(6)
date + .minutes(12)
date + .days(5, Calendar(identifier: .chinese))

Convert between time interval units:

let diff = date.timeIntervalSince(date2) // 172,800 seconds
diff.minutes // 2,800 minutes
diff.hours // 48 hours
diff.days // 2 days

Time zone context and offset:

let timeZone = TimeZone(identifier: "Europe/Paris")
timeZone?.isCurrent // false
timeZone?.offsetFromCurrent // -21600

Normalize date calculations and data storage:

let timeZone: TimeZone = .posix // GMT
let locale: Locale = .posix // en_US_POSIX

Decodable

Get a value of the type you specify, decoded from a JSON string.

let jsonString = "{\"test1\":29,\"test2\":62,\"test3\":33,\"test4\":24,\"test5\":14,\"test6\":72}"
let jsonObject: [String: Int] = jsonString.decode()

// Result [ "test1": 29, "test2": 62, "test3": 33, "test4": 24, "test5": 14, "test6": 72 ]

> Get a type-erased `Decodable` value:
```swift
let json = """
{
    "boolean": true,
    "integer": 1,
    "double": 3.14159265358979323846,
    "string": "Abc123",
    "date": "2018-12-05T15:28:25+00:00",
    "array": [1, 2, 3],
    "nested": {
        "a": "alpha",
        "b": "bravo",
        "c": "charlie"
    }
}
""".data(using: .utf8)

let decoder = JSONDecoder()
let dictionary = try decoder.decode([String: AnyDecodable].self, from: json)

dictionary["boolean"].value // true
dictionary["integer"].value // 1
dictionary["string"].value // Abc123

Skip failed elements during decoding instead exiting collection completely; lossy array decoding.

init(from decoder: Decoder) throws {
    let container = try decoder.container(keyedBy: CodingKeys.self)

self.authors = try container.decode(FailableCodableArray<Author>.self, forKey: .author)

}

</details>

<details>
<summary>DispatchQueue</summary>

> Provides configured queues for executing commonly related work items:
```swift
DispatchQueue.database.async {
    // Database work here
}

DispatchQueue.transform.async {
    // Parse or decode work here
}

DispatchQueue.logger.async {
    // Logging work here
}

FileManager

Get URL or file system path for a file:

FileManager.default.url(of: fileName, from: .documentDirectory)
FileManager.default.path(of: fileName, from: .cachesDirectory)

Get URL or file system paths of files within a directory:

FileManager.default.urls(from: .documentDirectory)
FileManager.default.paths(from: .downloadsDirectory)

Retrieve a file remotely and persist to local disk:

FileManager.default.download(from: "http://example.com/test.pdf") { url, response, error in
    // The `url` parameter represents location on local disk where remote file was downloaded.
}

Location

Get the location details for coordinates:

CLLocation(latitude: 43.6532, longitude: -79.3832).geocoder { meta in
    print(meta.locality)
    print(meta.country)
    print(meta.countryCode)
    print(meta.timezone)
    print(meta.administrativeArea)
}

Get the closest or farthest location from a list of coordinates:

let coordinates = [
    CLLocationCoordinate2D(latitude: 43.6532, longitude: -79.3832),
    CLLocationCoordinate2D(latitude: 59.9094, longitude: 10.7349),
    CLLocationCoordinate2D(latitude: 35.7750, longitude: -78.6336),
    CLLocationCoordinate2D(latitude: 33.720817, longitude: 73.090032)
]

coordinates.closest(to: homeCoordinate) coordinates.farthest(from: homeCoordinate)

> Approximate comparison of coordinates rounded to 3 decimal places (about 100 meters):
```swift
let coordinate1 = CLLocationCoordinate2D(latitude: 43.6532, longitude: -79.3832)
let coordinate2 = CLLocationCoordinate2D(latitude: 43.6531, longitude: -79.3834)
let coordinate3 = CLLocationCoordinate2D(latitude: 43.6522, longitude: -79.3822)

coordinate1 ~~ coordinate2 // true
coordinate1 ~~ coordinate3 // false

Determine if location services is enabled and authorized for always or when in use:

CLLocationManager.isAuthorized // bool

NotificationCenter

Auto released block-based notifications using a token property:

class MyObserver: NSObject {
    var token: NotificationCenter.Token? // Auto-released in deinit

func setup() {
    NotificationCenter.default.addObserver(forName: .SomeName, in: &token) {
        print("test")
    }
}

}

</details>

<details>
<summary>NSAttributedString</summary>

> Easily get the attributed string version of a string:
```swift
"Abc".attributed
"Lmn".mutableAttributed
"Xyz".mutableAttributed([
    .font: UIFont.italicSystemFont(ofSize: .systemFontSize),
    .foregroundColor: UIColor.green
])

Add attributed strings together:

label.attributedText = "Abc".attributed + " def " +
    "ghi".mutableAttributed([
        .underlineStyle: NSUnderlineStyle.single.rawValue
    ])

URL

Append a query string parameter to a URL:

let url = URL(string: "https://example.com?abc=123&lmn=tuv&xyz=987")
url?.appendingQueryItem("def", value: "456") // "https://example.com?abc=123&lmn=tuv&xyz=987&def=456"
url?.appendingQueryItem("xyz", value: "999") // "https://example.com?abc=123&lmn=tuv&xyz=999"

Append a dictionary of query string parameters to a URL:

let url = URL(string: "https://example.com?abc=123&lmn=tuv&xyz=987")
url?.appendingQueryItems([
    "def": "456",
    "jkl": "777",
    "abc": "333",
    "lmn": nil
]) // "https://example.com?xyz=987&def=456&abc=333&jkl=777"

Remove a query string parameter to a URL:

let url = URL(string: "https://example.com?abc=123&lmn=tuv&xyz=987")
url?.removeQueryItem("xyz") // "https://example.com?abc=123&lmn=tuv"

Query a URL from a parameter name:

let url = URL(string: "https://example.com?abc=123&lmn=tuv&xyz=987")
url?.queryItem("aBc") // "123"
url?.queryItem("lmn") // "tuv"
url?.queryItem("yyy") // nil

URLSession

A thin wrapper around URLSession and URLRequest for simple network requests:

let request = URLRequest(
    url: URL(string: "https://httpbin.org/get")!,
    method: .get,
    parameters: [
        "abc": 123,
        "def": "test456",
        "xyz": true
    ],
    headers: [
        "Abc": "test123",
        "Def": "test456",
        "Xyz": "test789"
    ]
)

let networkRepository = NetworkRepository( service: NetworkFoundationService() )

networkRepository.send(with: request) { result in switch result { case let .success(response): response.data response.headers response.statusCode case let .failure(error): error.statusCode } }

Or call multiple URL requests simultaneously:
```swift
let request1 = URLRequest(
    url: URL(string: "https://httpbin.org/get")!,
    method: .get
)

let request2 = URLRequest(
    url: URL(string: "https://httpbin.org/post")!,
    method: .post
)

let request3 = URLRequest(
    url: URL(string: "https://httpbin.org/delete")!,
    method: .delete
)

networkRepository.send(requests: request1, request2, request3) { firstResult, anotherResult, otherResult in
    switch firstResult {
    case let .success(response):
        response.data
    case let .failure(error):
        error.statusCode
    }

    switch anotherResult {
    case let .success(response):
        response.data
    case let .failure(error):
        error.statusCode
    }

    switch otherResult {
    case let .success(response):
        response.data
    case let .failure(error):
        error.statusCode
    }
}

Use an adapter to intercept any URLRequest and modify for all network requests:

struct CustomURLRequestAdapter: URLRequestAdapter {

func adapt(_ request: URLRequest) -> URLRequest {
    var request = request
    request.setValue("1", forHTTPHeaderField: "X-Test-1")
    request.setValue("2", forHTTPHeaderField: "X-Test-2")
    return request
}

}

let request = URLRequest( url: URL(string: "https://httpbin.org/get")!, method: .get )

let networkRepository = NetworkRepository( service: NetworkFoundationService(), adapter: CustomURLRequestAdapter() )

networkRepository.send(with: request) { result in guard case let .success(response) else { return }

request.value(forHTTPHeaderField: "X-Test-1") == nil // true
request.value(forHTTPHeaderField: "X-Test-2") == nil // true

response.request.value(forHTTPHeaderField: "X-Test-1") == "1" // true
response.request.value(forHTTPHeaderField: "X-Test-2") == "2" // true

}

</details>

### Application

<details>
<summary>AppInfo</summary>

> Get details of the current app:
```swift
struct SomeStruct: AppInfo {

}

let someStruct = SomeStruct()

someStruct.appDisplayName // "Zamzam App"
someStruct.appBundleID // "io.zamzam.app"
someStruct.appVersion // "1.0.0"
someStruct.appBuild // "23"
someStruct.isInTestFlight // false
someStruct.isRunningOnSimulator // false

ApplicationPlugin

Split up AppDelegate into plugins (also available for WKExtensionDelegate):

// Subclass and install to pass lifecycle events to loaded plugins
@UIApplicationMain
class AppDelegate: ApplicationPluggableDelegate {

override func plugins() -> [ApplicationPlugin] {[
    LoggerPlugin(),
    NotificationPlugin()
]}

}

```swift
// Each application plugin has access to the `AppDelegate` lifecycle events
final class LoggerPlugin: ApplicationPlugin {
    private let log = Logger()

    func application(_ application: UIApplication, willFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        log.config(for: application)
        return true
    }

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey : Any]?) -> Bool {
        log.info("App did finish launching.")
        return true
    }

    func applicationDidReceiveMemoryWarning(_ application: UIApplication) {
        log.warning("App did receive memory warning.")
    }

    func applicationWillTerminate(_ application: UIApplication) {
        log.warning("App will terminate.")
    }
}

Split up SceneDelegate into plugins:

// Subclass and install to pass lifecycle events to loaded plugins
class SceneDelegate: ScenePluggableDelegate {

override func plugins() -> [ScenePlugin] {[
    LoggerPlugin(),
    NotificationPlugin()
]}

}

```swift
// Each application plugin has access to the `SceneDelegate` lifecycle events
final class LoggerPlugin: ScenePlugin {
    private let log = Logger()

    func sceneWillEnterForeground() {
        log.info("Scene will enter foreground.")
    }

    func sceneDidEnterBackground() {
        log.info("Scene did enter background.")
    }
}

Apply

Set properties with closures just after initializing:

let paragraph = NSMutableParagraphStyle().apply {
    $0.alignment = .center
    $0.lineSpacing = 8
}

let label = UILabel().apply { $0.textAlignment = .center $0.textColor = UIColor.black $0.text = "Hello, World!" }

UITabBar.appearance().apply { $0.barStyle = .dark $0.tintColor = .blue }

</details>

<details>
<summary>AppMigration</summary>

> Manages blocks of code that only need to run once on version updates in apps:
```swift
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?
    let migration = AppMigration()

    func application(_ application: UIApplication, willFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]? = nil) -> Bool {
        migration
            .performUpdate {
                print("Migrate update occurred.")
            }
            .perform(forVersion: "1.0") {
                print("Migrate to 1.0 occurred.")
            }
            .perform(forVersion: "1.7") {
                print("Migrate to 1.7 occurred.")
            }
            .perform(forVersion: "2.4") {
                print("Migrate to 2.4 occurred.")
            }

        return true
    }
}

BackgroundTask

Easily execute a long-running background task:

BackgroundTask.run(for: application) { task in
    // Perform finite-length task...
    task.end()
}

Preferences

Keychain

A thin wrapper to manage Keychain, or other services that conform to SecuredPreferencesService:

let keychain = SecuredPreferences(
    service: SecuredPreferencesKeychainService()
)

keychain.set("kjn989hi", forKey: .token)

keychain.get(.token) { print($0) // "kjn989hi" }

// Define strongly-typed keys extension SecuredPreferencesAPI.Key { static let token = SecuredPreferencesAPI.Key("token") }

</details>

<details>
<summary>UserDefaults</summary>

> A thin wrapper to manage `UserDefaults`, or other services that conform to `PreferencesService`:
```swift
let preferences = Preferences(
    service: PreferencesDefaultsService(
        defaults: UserDefaults.standard
    )
)

preferences.set(123, forKey: .abc)
preferences.get(.token) // 123

// Define strongly-typed keys
extension PreferencesAPI.Keys {
    static let abc = PreferencesAPI.Key<String>("abc")
}

Utilities

Localization

Strongly-typed localizable keys that's also XLIFF export friendly (read more):

// First define localization keys
extension Localizable {
    static let ok = Localizable(NSLocalizedString("ok.dialog", comment: "OK text for dialogs"))
    static let cancel = Localizable(NSLocalizedString("cancel.dialog", comment: "Cancel text for dialogs"))
    static let next = Localizable(NSLocalizedString("next.dialog", comment: "Next text for dialogs"))
}

// Then use strongly-typed localization keys myLabel1.text = .localized(.ok) myLabel2.text = .localized(.cancel) myLabel3.text = .localized(.next)

</details>

<details>
<summary>Logger</summary>

> Create loggers that conform to `LogService` and add to `LogRepository` (console and `os_log` are included):
```swift
let log = LogRepository(
    services: [
        LogConsoleService(minLevel: .debug),
        LogOSService(
            minLevel: .warning,
            subsystem: "io.zamzam.Basem-Emara",
            category: "Application"
        ),
        MyCustomLogger()
    ]
)

log.error("There was an error.")

SystemConfiguration

Determine if the device is connected to a network:

import SystemConfiguration

SCNetworkReachability.isOnline

</details>

<details>
<summary>Synchronized</summary>

> A thread-safe value that handles concurrent reads and writes ([read more](https://basememara.com/creating-thread-safe-generic-values-in-swift/)):
```swift
var temp = Synchronized<Int>(0)

DispatchQueue.concurrentPerform(iterations: 1_000_000) { index in
    temp.value { $0 += 1 }
}

XCTAssertEqual(temp.value, 1_000_000) // true

Throttle & Debounce

A throttler that will ignore work items until the time limit for the preceding call is over:

let limiter = Throttler(limit: 5)
var value = 0

limiter.execute { value += 1 }

limiter.execute { value += 1 }

limiter.execute { value += 1 }

sleep(5)

limiter.execute { value += 1 }

// value == 2

> A debouncer that will delay work items until time limit for the preceding call is over:
```swift
let limiter = Debouncer(limit: 5)
var value = ""

func sendToServer() {
    limiter.execute {
        // Sends to server after no typing for 5 seconds
        // instead of once per character, so:
        value == "hello" // true
    }
}

value.append("h")
sendToServer() // Waits until 5 seconds

value.append("e")
sendToServer() // Waits until 5 seconds

value.append("l")
sendToServer() // Waits until 5 seconds

value.append("l")
sendToServer() // Waits until 5 seconds

value.append("o")
sendToServer() // Fires after 5 seconds

Infixes

ConditionalAssignment ?=

Assign a value if not nil:

var test: Int? = 123
var value: Int? = nil

test ?= value // test == 123

value = 456 test ?= value // test == 456

</details>

<details>
<summary>NilOrEmptyAssignment ??+</summary>

> Assign a value if not nil or empty:
```swift
var test: String
var value: String?

test = value ??+ "Abc"
// test == "Abc"

value = ""
test = value ??+ "Lmn"
// test == "Lmn"

value = "Xyz"
test = value ??+ "Rst"
// test == "Xyz"

ZamzamLocation

LocationsRepository

Location worker that offers easy authorization and observable closures (read more):

class LocationViewController: UIViewController {

@IBOutlet weak var outputLabel: UILabel!

var locationsRepository: LocationsRepositoryType = LocationsRepository(
    desiredAccuracy: kCLLocationAccuracyThreeKilometers,
    distanceFilter: 1000
)

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)

    locationsRepository.addObserver(locationObserver)
    locationsRepository.addObserver(headingObserver)

    locationsRepository.requestAuthorization(
        for: .whenInUse,
        startUpdatingLocation: true,
        completion: { granted in
            guard granted else { return }
            self.locationsProvider.startUpdatingHeading()
        }
    )
}

override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)
    locationsRepository.removeObservers()
}

deinit {
    locationsRepository.removeObservers()
}

}

extension LocationViewController {

var locationObserver: Observer<LocationsRepository.LocationHandler> {
    Observer { [weak self] in
        self?.outputLabel.text = $0.description
    }
}

var headingObserver: Observer<LocationsRepository.HeadingHandler> {
    Observer {
        print($0.description)
    }
}

}

</details>

## ZamzamNotification

<details>
<summary>UserNotification</summary>

> Registers the local and remote notifications with the categories and actions it supports:
```swift
UNUserNotificationCenter.current().register(
    delegate: self,
    categories: [
        "order": [
            UNNotificationAction(
                identifier: "confirmAction",
                title: "Confirm",
                options: [.foreground]
            )
        ],
        "chat": [
            UNTextInputNotificationAction(
                identifier: "replyAction",
                title: "Reply",
                options: [],
                textInputButtonTitle: "Send",
                textInputPlaceholder: "Type your message"
            )
        ],
        "offer": nil
    ],
    authorizations: [.alert, .badge, .sound],
    completion: { granted in
        granted
            ? log.debug("Authorization for notification succeeded.")
            : log.warn("Authorization for notification not given.")
    }
)

Get a list of all pending or delivered user notifications:

UNUserNotificationCenter.current().getNotificationRequests { notifications in
    notifications.forEach {
        print($0.identifier)
    }
}

Find the pending or delivered notification request by identifier:

UNUserNotificationCenter.current().get(withIdentifier: "abc123") {
    print($0?.identifier)
}

UNUserNotificationCenter.current().get(withIdentifiers: ["abc123", "xyz789"]) { $0.forEach { print($0.identifier) } }

> Determine if the pending or delivered notification request exists:
```swift
UNUserNotificationCenter.current().exists(withIdentifier: "abc123") {
    print("Does notification exist: \($0)")
}

Schedules local notifications for delivery:

UNUserNotificationCenter.current().add(
    body: "This is the body for time interval",
    timeInterval: 5
)

UNUserNotificationCenter.current().add( body: "This is the body for time interval", title: "This is the snooze title", timeInterval: 60, identifier: "abc123-main" )

UNUserNotificationCenter.current().add( body: "This is the body for time interval", title: "This is the misc1 title", timeInterval: 60, identifier: "abc123-misc1", category: "misc1Category" )

UNUserNotificationCenter.current().add( body: "This is the body for time interval", title: "This is the misc2 title", timeInterval: 60, identifier: "abc123-misc2", category: "misc2Category", userInfo: [ "id": post.id, "link": post.link, "mediaURL": mediaURL ], completion: { error in guard error == nil else { return } // Added successfully } )

UNUserNotificationCenter.current().add( date: Date(timeIntervalSinceNow: 5), body: "This is the body for date", repeats: .minute, identifier: "abc123-repeat" )

> Get a remote image from the web and convert to a user notification attachment:
```swift
UNNotificationAttachment.download(from: urlString) {
    guard case let .success(attachment) = $0 else {
        log.error("Could not download the remote resource (\(urlString)): \($0.error?.debugDescription).")
        return
    }

    UNUserNotificationCenter.current().add(
        body: "This is the body",
        attachments: [attachment]
    )
}

Remove pending or delivered notification requests by identifiers, categories, or all:

UNUserNotificationCenter.current().remove(withIdentifier: "abc123")
UNUserNotificationCenter.current().remove(withIdentifiers: ["abc123", "xyz789"])
UNUserNotificationCenter.current().remove(withCategory: "chat") { /* Done */ }
UNUserNotificationCenter.current().remove(withCategories: ["order", "chat"]) { /* Done */ }
UNUserNotificationCenter.current().removeAll()

ZamzamUI

UIKit

BadgeBarButtonItem

A bar button item with a badge value:

[Image of BadgeBarButtonItem](./Documentation/Images/BadgeBarButtonItem.png)

navigationItem.rightBarButtonItems = [
    BadgeBarButtonItem(
        button: UIButton(type: .contactAdd),
        badgeText: "123",
        target: self,
        action: #selector(test)
    )
]

navigationItem.leftBarButtonItems = [
    BadgeBarButtonItem(
        button: UIButton(type: .detailDisclosure),
        badgeText: SCNetworkReachability.isOnline ? "On" : "Off",
        target: self,
        action: #selector(test)
    ).apply {
        $0.badgeFontColor = SCNetworkReachability.isOnline ? .black : .white
        $0.badgeBackgroundColor = SCNetworkReachability.isOnline ? .green : .red
    }
]

GradientView

A UIView with gradient effects:

@IBOutlet weak var gradientView: GradientView! {
    didSet {
        gradientView.firstColor = .blue
        gradientView.secondColor = .red
    }
}

Interface Builder compatible via "User Defined Runtime Attributes":

[Image of GradientView](./Documentation/Images/GradientView-Storyboard.png)

MailComposer

Compose an email with optional subject, body, or attachment:

// Before
extension MyViewController: MFMailComposeViewControllerDelegate {

func sendEmail() {
    guard MFMailComposeViewController.canSendMail() else {
        return present(alert: "Could Not Send Email", message: "Your device could not send e-mail.")
    }

    let mail = MFMailComposeViewController()
    mail.mailComposeDelegate = self
    mail.setToRecipients(["[email protected]"])

    present(mail, animated: true)
}

func mailComposeController(_ controller: MFMailComposeViewController, didFinishWith result: MFMailComposeResult, error: Error?) {
    controller.dismiss(animated: true)
}

}

```swift
// After
class MyViewController: UIViewController {
    private let mailComposer = MailComposer()

    func sendEmail() {
        guard let controller = mailComposer.makeViewController(email: "[email protected]") else {
            return present(alert: "Could Not Send Email", message: "Your device could not send e-mail.")
        }

        present(controller, animated: true)
    }

NextResponderTextField

An extended UITextView that wires the "Return Key" to another UIResponder:

[Image of NextResponderTextField](./Documentation/Images/NextResponderTextField.png)

[Image of NextResponderTextField2](./Documentation/Images/NextResponderTextField2.png)

RoundedView

A UIView, UIImage, and UIButton subclasses with circular masking:

[Image of RoundedView](./Documentation/Images/RoundedView.png)

ScrollViewWithKeyboard

Automatically extends the scroll view insets when the keyboard is shown:

[Image of KeyboardScrollView](./Documentation/Images/KeyboardScrollView.png)

StatusBarable

Manages the status bar view:

class ViewController: UIViewController, StatusBarable {

let application = UIApplication.shared
var statusBar: UIView?

override func viewDidLoad() {
    showStatusBar()

    NotificationCenter.default.addObserver(
        for: UIDevice.orientationDidChangeNotification,
        selector: #selector(deviceOrientationDidChange),
        from: self
    )
}

}

private extension ViewController {

@objc func deviceOrientationDidChange() {
    removeStatusBar()
    showStatusBar()
}

}

![Image of StatusBarable](./Documentation/Images/StatusBarable.png)
</details>

<details>
<summary>UICollectionView</summary>

> Register cells in strongly-typed manner:
```swift
collectionView.register(nib: TransactionViewCell.self)

Get reusable cells through subscript:

// Before
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath) as? TransactionViewCell 

// After
let cell: TransactionViewCell = collectionView[indexPath]

UIImage

Save an image to disk as .png:

imageView.image.pngToDisk() // "/.../Library/Caches/img_ezoPU8.png"

Convert a color to an image:

let image = UIImage(from: .lightGray)
button.setBackgroundImage(image, for: .selected)

UILabel

Enable data detectors like in UITextView:

// Before
let label = UITextView()
label.isEditable = false
label.isScrollEnabled = false
label.textContainer.lineFragmentPadding = 0
label.textContainerInset = .zero
label.backgroundColor = .clear
label.dataDetectorTypes = [.phoneNumber, .link, .address, .calendarEvent]

// After
let label = UILabelView(
    dataDetectorTypes: [.phoneNumber, .link, .address, .calendarEvent]
)

UIStackView

Add a view with animation:

stackView.addArrangedSubview(view1, animated: true)

Add a list of views:

stackView.addArrangedSubviews([view1, view2, view3])
stackView.addArrangedSubviews([view1, view3], animated: true)

Remove and deinitialize all views:

stackView
    .deleteArrangedSubviews()
    .addArrangedSubviews([view2, view3]) // Chain commands

UIStoryboard

Instantiate a view controller using convention of storyboard identifier matching class name:

let storyboard = UIStoryboard(name: "Main")
let controller: MyViewController = storyboard.instantiateViewController()

UITableView

Register cells in strongly-typed manner:

tableView.register(nib: TransactionViewCell.self)

Get reusable cells through subscript:

// Before
let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath) as? TransactionViewCell 

// After
let cell: TransactionViewCell = tableView[indexPath]

Scroll to top or bottom:

tableView.scrollToTop()
tableView.scrollToBottom()

Set selection color of cell:

// Before
let backgroundView = UIView()
backgroundView.backgroundColor = .lightGray
cell.selectedBackgroundView = backgroundView

// After
cell.selectionColor = .lightGray

Strongly-typed cell identifiers for static tables:

class ViewController: UITableViewController {

}

extension ViewController: CellIdentifiable {

// Each table view cell must have an identifier that matches a case
enum CellIdentifier: String {
    case about
    case subscribe
    case feedback
    case tutorial
}

}

extension ViewController {

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    tableView.deselectRow(at: indexPath, animated: true)

    guard let cell = tableView.cellForRow(at: indexPath),
        let identifier = CellIdentifier(from: cell) else {
            return
    }

    // Easily reference the associated cell
    switch identifier {
    case .about:
        router.showAbout()
    case .subscribe:
        router.showSubscribe()
    case .feedback:
        router.sendFeedback(
            subject: .localizedFormat(.emailFeedbackSubject, constants.appDisplayName!)
        )
    case .tutorial:
        router.startTutorial()
    }
}

}

</details>

<details>
<summary>UITextView</summary>

> A placeholder like in `UITextField`:
```swift
let textView = PlaceholderTextView()
textView.placeholder = "Enter message..."

Interface Builder compatible via Attributes inspector:

[Image of GradientView](./Documentation/Images/PlaceholderTextView-Storyboard.png)

UIToolbar

Create a toolbar that toggles to next field or dismisses keyboard:

class ViewController: UIViewController {

private lazy var inputDoneToolbar: UIToolbar = .makeInputDoneToolbar(
    target: self,
    action: #selector(endEditing)
)

}

extension ViewController: UITextViewDelegate {

func textViewShouldBeginEditing(_ textView: UITextView) -> Bool {
    textView.inputAccessoryView = inputDoneToolbar
    return true
}

}

![Image of UIToolbar](./Documentation/Images/UIToolbar.png)
</details>

<details>
<summary>UIView</summary>

> Sometimes `isHidden` can be unintuitive:
```swift
myView.isVisible = isAuthorized && role.within[.admin, .author]

Adjust border, corners, and shadows conveniently:

myView.borderColor = .red
myView.borderWidth = 1
myView.cornerRadius = 3
myView.addShadow()

[Image of UIView-Shadow](./Documentation/Images/UIView-Shadow.png)

Animate visibility:

myView.fadeIn()
myView.fadeOut()

Add activity indicator to center of view:

let activityIndicator = myView.makeActivityIndicator()
activityIndicator.startAnimating()

Create instance from XIB:

let control = MyView.loadNIB()
control.isAwesome = true
addSubview(control)

Present a view modally:

class ModalView: UIView, PresentableView {

@IBOutlet weak var contentView: UIView!

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    // Dismiss self when tapped on background
    dismiss()
}

@IBAction func closeButtonTapped() {
    dismiss()
}

}

class ViewController: UIViewController {

@IBAction func modalButtonTapped() {
    let modalView = ModalView.loadNIB()
    present(control: modalView)
}

}

![Image of PresentableView](./Documentation/Images/PresentableView.gif)
</details>

<details>
<summary>UIViewController</summary>

> Display an alert to the user:
```swift
// Before
let alertController = UIAlertController(title: "My Title", message: "This is my message.", preferredStyle: .alert)
alertController.addAction(UIAlertAction(title: "OK", style: .default) { alert in
    print("OK tapped")
}
present(alertController, animated: true, completion: nil)

// After
present(alertController: "My Title", message: "This is my message.") {
    print("OK tapped")
}

Display a Safari web page to the user:

// Before
let safariController = SFSafariViewController(URL: URL(string: "https://apple.com")!)
safariController.modalPresentationStyle = .overFullScreen
present(safariController, animated: true, completion: nil)

// After
present(safari: "https://apple.com")
show(safari: "https://apple.com")

Display an action sheet to the user:

present(
    actionSheet: "Test Action Sheet",
    message: "Choose your action",
    popoverFrom: sender,
    additionalActions: [
        UIAlertAction(title: "Action 1") { },
        UIAlertAction(title: "Action 2") { },
        UIAlertAction(title: "Action 3") { }
    ],
    includeCancelAction: true
)

Display a prompt to the user:

// Before
let alertController = UIAlertController(
    title: "Test Prompt",
    message: "Enter user input.",
    preferredStyle: .alert
)

alertController.addAction( UIAlertAction(title: "Cancel", style: .cancel) { _ in } )

alertController.addTextField { $0.placeholder = "Your placeholder here" $0.keyboardType = .phonePad $0.textContentType = .telephoneNumber }

alertController.addAction( UIAlertAction(title: "Ok", style: .default) { _ in guard let text = alertController.textFields?.first?.text else { return }

    print("User response: \($0)")
}

)

present(alertController, animated: animated, completion: nil)

```swift
// After
present(
    prompt: "Test Prompt",
    message: "Enter user input.",
    placeholder: "Your placeholder here",
    configure: {
        $0.keyboardType = .phonePad
        $0.textContentType = .telephoneNumber
    },
    response: {
        print("User response: \($0)")
    }
)

[Image of UIViewController Prompt](./Documentation/Images/UIViewController-Prompt.png)

Display a share activity with Safari added:

let safariActivity = UIActivity.make(
    title: .localized(.openInSafari),
    imageName: "safari-share",
    imageBundle: .zamzamKit,
    handler: {
        guard SCNetworkReachability.isOnline else {
            return self.present(alert: "Device must be online to view within the browser.")
        }

    UIApplication.shared.open(link)
}

)

present( activities: ["Test Title", link], popoverFrom: sender, applicationActivities: [safariActivity] )

</details>

<details>
<summary>UIWindow</summary>

> Get the top view controller for the window:
```swift
window?.topViewController

WatchKit

CLKComplicationServer

Invalidates and reloads all timeline data for all complications:

// Before
guard let complications = activeComplications, !complications.isEmpty else { return }
complications.forEach { reloadTimeline(for: $0) }

// After
CLKComplicationServer.sharedInstance().reloadTimelineForComplications()

Extends all timeline data for all complications:

// Before
guard let complications = activeComplications, !complications.isEmpty else { return }
complications.forEach { extendTimeline(for: $0) }

// After
CLKComplicationServer.sharedInstance().extendTimelineForComplications()

WKViewController

Display an alert to the user:

present(alert: "Test Alert")

Display an action sheet to the user:

present(
    actionSheet: "Test",
    message: "This is the message.",
    additionalActions: [
        WKAlertAction(title: "Action 1", handler: {}),
        WKAlertAction(title: "Action 2", handler: {}),
        WKAlertAction(title: "Action 3", style: .destructive, handler: {})
    ],
    includeCancelAction: true
)

Display an side-by-side alert to the user:

present(
    sideBySideAlert: "Test",
    message: "This is the message.",
    additionalActions: [
        WKAlertAction(title: "Action 1", handler: {}),
        WKAlertAction(title: "Action 2", style: .destructive, handler: {}),
        WKAlertAction(title: "Action 3", handler: {})
    ]
)

Author

• Zamzam, https://zamzam.io
• Basem Emara, https://basememara.com

License

ZamzamKit is available under the MIT license. See the LICENSE file for more info.