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Code Quality Rank: L5
Programming language: Swift
License: MIT License
Tags: UI     Transition    
Latest version: v2.0

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README

TransitionManager

Painless custom transitioning. Easy extend, easy setup, just focus on animations.

Installation

CocoaPods

You can use CocoaPods to install TransitionManager by adding it to your Podfile:

platform :ios, '8.0'
use_frameworks!
pod 'TransitionManager'

To get the full benefits import TransitionManager wherever you import UIKit

import UIKit
import TransitionManager

Manually

  1. Download and drop /TransitionManagerfolder in your project.
  2. Congratulations!

Usage

Copy & paste TransitionManager.swift into your project.

  • Declare a TransitionManager object.
  • Init it with a TransitionManagerAnimation
  • Assign it as your navigation controller's delegate if you use navigation controller.
    • Else assign it as your view controller's transitioningDelegate.

    var transition: TransitionManager!

    override func viewDidLoad() {
       super.viewDidLoad()

       transition = TransitionManager (transitionAnimation: FadeTransitionAnimation())
       navigationController?.delegate = transition
    }

Creating Transition Animations

Create a subclass of TransitionManagerAnimation

    class FadeTransitionAnimation: TransitionManagerAnimation {

    }

TransitionManagerAnimation class implements TransitionManagerDelegate protocol.

TransitionManagerDelegate
protocol TransitionManagerDelegate {

    /// Transition nimation method implementation
    func transition(
        container: UIView,
        fromViewController: UIViewController,
        toViewController: UIViewController,
        isDismissing: Bool,
        duration: NSTimeInterval,
        completion: () -> Void)

    /// Interactive transitions,
    /// update percent in gesture handler
    var interactionTransitionController: UIPercentDrivenInteractiveTransition? { get set }
}

For transition animation, we should override transition func and write our custom animation in it.


class FadeTransitionAnimation: TransitionManagerAnimation {
    override func transition(
        container: UIView,
        fromViewController: UIViewController,
        toViewController: UIViewController,
        isDismissing: Bool,
        duration: NSTimeInterval,
        completion: () -> Void) {
        if isDismissing {
            closeAnimation(container,
                fromViewController: fromViewController,
                toViewController: toViewController,
                duration: duration,
                completion: completion)
        } else {
            openAnimation(container,
                fromViewController: fromViewController,
                toViewController: toViewController,
                duration: duration,
                completion: completion)
        }
    }    
}

One important part is completion() must be called because the TransitionManager finishes transition after it gets called.

Interaction Transition

Interaction transition has 3 parts:

  • Init interactionTransitionController and either pop or push navigation controller when gesture (interaction) starts.
  • Calculate your percents on gesture change and updateInteractiveTransition: with that percent
  • When gesture ended, decide if your transition complete or not and give information to your interactionTransitionController with finishInteractiveTransition () and cancelInteractiveTransition ()

Easier TransitionManager setup

You can create a TransitionManagerAnimation container enum and give it all your animations

    enum TransitionManagerAnimations {
        case Fade
        case Pull
    }

Write a func that returns correct transition animation in enum

enum TransitionManagerAnimations {
    case Fade
    case Pull

    func transitionAnimation () -> TransitionManagerAnimation {
        switch self {
        case .Fade:
            return FadeTransitionAnimation()
        case .Pull:
            return PullTransitionAnimation()
        }
    }
}

Extend TransitionManager and write a new init method like

extension TransitionManager {
    convenience init(transition: TransitionManagerAnimations) {
        self.init(transitionAnimation: transition.transitionAnimation())
    }
}

Now you can create TransitionManager in your view controller like

transition = TransitionManager(transition: .Pull)
navigationController?.delegate = transition