This library provides an async image downloader with cache support. For convenience, we added categories for UI elements like UIImageView, UIButton, MKAnnotationView.
SDWebImage alternatives and similar libraries
Based on the "Images" category
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This library provides an async image downloader with cache support. For convenience, we added categories for UI elements like
- [x] Categories for
MKAnnotationViewadding web image and cache management
- [x] An asynchronous image downloader
- [x] An asynchronous memory + disk image caching with automatic cache expiration handling
- [x] A background image decompression
- [x] Improved support for animated images
- [x] Customizable and composable transformations can be applied to the images right after download
- [x] Custom cache control
- [x] Expand the image loading capabilites by adding your own custom loaders or using prebuilt loaders like FLAnimatedImage plugin or Photos Library plugin
- [x] Loading indicators
- [x] A guarantee that the same URL won't be downloaded several times
- [x] A guarantee that bogus URLs won't be retried again and again
- [x] A guarantee that main thread will never be blocked
- [x] Performances!
- [x] Use GCD and ARC
Supported Image Formats
- Image formats supported by UIImage (JPEG, PNG, ...), including GIF
- WebP format, including animated WebP (use the SDWebImageWebPCoder project)
- Support extendable coder plugins for new image formats. Like APNG, BPG, HFIF, SVG, etc. See all the list in Image coder plugin List
In order to keep SDWebImage focused and limited to the core features, but also allow extensibility and custom behaviors, during the 5.0 refactoring we focused on modularizing the library. As such, we have moved/built new modules to SDWebImage org.
Coders for additional image formats
- SDWebImageWebPCoder - coder for WebP image format. Based on libwebp
- SDWebImageHEIFCoder - coder to support HEIF image without Apple's
Image/IO framework, iOS 8+/macOS 10.10+ support.
- SDWebImageBPGCoder - coder for BPG format
- SDWebImageFLIFCoder - coder for FLIF format
- and more from community!
- SDWebImagePhotosPlugin - plugin to support loading images from Photos (using
Integration with 3rd party libraries
- SDWebImageFLPlugin - plugin to support FLAnimatedImage as the engine for animated GIFs
- SDWebImageYYPlugin - plugin to integrate YYImage & YYCache for image rendering & caching
- SDWebImageProgressiveJPEGDemo - demo project for using
SDWebImage+ Concorde library for Progressive JPEG decoding
Make our lives easier
- libwebp-Xcode - A wrapper for libwebp + an Xcode project.
- libheif-Xcode - A wrapper for libheif + an Xcode project.
- and more third-party C/C++ image codec libraries with CocoaPods/Carthage support.
You can use those directly, or create similar components of your own.
- iOS 8.0 or later
- tvOS 9.0 or later
- watchOS 2.0 or later
- macOS 10.10 or later
- Xcode 10.0 or later
- For iOS 7, macOS 10.9 or Xcode < 8, use any 4.x version up to 4.4.6
- For macOS 10.8, use any 4.x version up to 4.3.0
- For iOS 5 and 6, use any 3.x version up to 3.7.6
- For iOS < 5.0, please use the last 2.0 version.
- Read this Readme doc
- Read the How to use section
- Read the Latest Documentation and CocoaDocs for old version
- Try the example by downloading the project from Github or even easier using CocoaPods try
pod try SDWebImage
- Read the Installation Guide
- Read the SDWebImage 5.0 Migration Guide to get an idea of the changes from 4.x to 5.x
- Read the SDWebImage 4.0 Migration Guide to get an idea of the changes from 3.x to 4.x
- Read the Common Problems to find the solution for common problems
- Go to the Wiki Page for more information such as Advanced Usage
Who Uses It
- Find out who uses SDWebImage and add your app to the list.
- If you need help, use Stack Overflow. (Tag 'sdwebimage')
- If you'd like to ask a general question, use Stack Overflow.
- If you found a bug, open an issue.
- If you have a feature request, open an issue.
- If you want to contribute, read the Contributing Guide
How To Use
#import <SDWebImage/SDWebImage.h> ... [imageView sd_setImageWithURL:[NSURL URLWithString:@"http://www.domain.com/path/to/image.jpg"] placeholderImage:[UIImage imageNamed:@"placeholder.png"]];
import SDWebImage imageView.sd_setImage(with: URL(string: "http://www.domain.com/path/to/image.jpg"), placeholderImage: UIImage(named: "placeholder.png"))
- For details about how to use the library and clear examples, see The detailed How to use
Animated Images (GIF) support
In 5.0, we introduced a brand new mechanism for supporting animated images. This includes animated image loading, rendering, decoding, and also supports customizations (for advanced users).
This animated image solution is available for
SDAnimatedImage is subclass of
SDAnimatedImageView is subclass of
UIImageView/NSImageView, to make them compatible with the common frameworks APIs. See Animated Image for more detailed information.
FLAnimatedImage integration has its own dedicated repo
In order to clean up things and make our core project do less things, we decided that the
FLAnimatedImage integration does not belong here. From 5.0, this will still be available, but under a dedicated repo SDWebImageFLPlugin.
There are four ways to use SDWebImage in your project:
- using CocoaPods
- using Carthage
- using Swift Package Manager
- manual install (build frameworks or embed Xcode Project)
Installation with CocoaPods
platform :ios, '8.0' pod 'SDWebImage', '~> 5.0'
Swift and static framework
Swift project previously have to use
use_frameworks! to make all Pods into dynamic framework to let CocoaPods works.
However, start with
CocoaPods 1.5.0+ (with
Xcode 9+), which supports to build both Objective-C && Swift code into static framework. You can use modular headers to use SDWebImage as static framework, without the need of
platform :ios, '8.0' # Uncomment the next line when you want all Pods as static framework # use_modular_headers! pod 'SDWebImage', :modular_headers => true
See more on CocoaPods 1.5.0 — Swift Static Libraries
If not, you still need to add
use_frameworks! to use SDWebImage as dynamic framework:
platform :ios, '8.0' use_frameworks! pod 'SDWebImage'
There are 2 subspecs available now:
MapKit (this means you can install only some of the SDWebImage modules. By default, you get just
Core, so if you need
MapKit, you need to specify it).
Installation with Carthage (iOS 8+)
Carthage is a lightweight dependency manager for Swift and Objective-C. It leverages CocoaTouch modules and is less invasive than CocoaPods.
To install with carthage, follow the instruction on Carthage
Carthage users can point to this repository and use whichever generated framework they'd like: SDWebImage, SDWebImageMapKit or both.
Make the following entry in your Cartfile:
If this is your first time using Carthage in the project, you'll need to go through some additional steps as explained over at Carthage.
NOTE: At this time, Carthage does not provide a way to build only specific repository subcomponents (or equivalent of CocoaPods's subspecs). All components and their dependencies will be built with the above command. However, you don't need to copy frameworks you aren't using into your project. For instance, if you aren't using
SDWebImageMapKit, feel free to delete that framework from the Carthage Build directory after
Installation with Swift Package Manager (Xcode 11+)
Swift Package Manager (SwiftPM) is a tool for managing the distribution of Swift code as well as C-family dependency. From Xcode 11, SwiftPM got natively integrated with Xcode.
SDWebImage support SwiftPM from version 5.1.0. To use SwiftPM, you should use Xcode 11 to open your project. Click
Swift Packages ->
Add Package Dependency, enter SDWebImage repo's URL. Or you can login Xcode with your GitHub account and just type
SDWebImage to search.
After select the package, you can choose the dependency type (tagged version, branch or commit). Then Xcode will setup all the stuff for you.
If you're a framework author and use SDWebImage as a dependency, update your
let package = Package( // 5.1.0 ..< 6.0.0 dependencies: [ .package(url: "https://github.com/SDWebImage/SDWebImage.git", from: "5.1.0") ], // ... )
Manual Installation Guide
See more on Manual install Guide
Import headers in your source files
In the source files where you need to use the library, import the umbrella header file:
At this point your workspace should build without error. If you are having problem, post to the Issue and the community can help you solve it.
All source code is licensed under the MIT License.
High Level Diagram
Overall Class Diagram
Top Level API Diagram
Main Sequence Diagram
More detailed diagrams
*Note that all licence references and agreements mentioned in the SDWebImage README section above are relevant to that project's source code only.