mirror of
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204 lines
8.7 KiB
Markdown
204 lines
8.7 KiB
Markdown
<p align="center">
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<img src="SDWebImage_logo.png" title="SDWebImage logo" float=left>
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</p>
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[](https://travis-ci.org/SDWebImage/SDWebImage)
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[](http://cocoadocs.org/docsets/SDWebImage/)
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[](http://cocoadocs.org/docsets/SDWebImage/)
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[](https://www.apache.org/licenses/LICENSE-2.0.html)
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[](https://github.com/SDWebImage/SDWebImage)
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[](https://codecov.io/gh/SDWebImage/SDWebImage)
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This library provides an async image downloader with cache support. For convenience, we added categories for UI elements like `UIImageView`, `UIButton`, `MKAnnotationView`.
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## Features
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- [x] Categories for `UIImageView`, `UIButton`, `MKAnnotationView` adding web image and cache management
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- [x] An asynchronous image downloader
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- [x] An asynchronous memory + disk image caching with automatic cache expiration handling
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- [x] A background image decompression
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- [x] A guarantee that the same URL won't be downloaded several times
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- [x] A guarantee that bogus URLs won't be retried again and again
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- [x] A guarantee that main thread will never be blocked
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- [x] Performances!
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- [x] Use GCD and ARC
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## Supported Image Formats
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- Image formats supported by UIImage (JPEG, PNG, ...), including GIF
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- WebP format, including animated WebP (use the `WebP` subspec)
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- Support extendable coder plugins for new image formats. Like APNG, BPG, HFIF, SVG, etc. See all the list in [Image coder plugin List](https://github.com/SDWebImage/SDWebImage/wiki/Coder-Plugin-List)
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## Beta version
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SDWebImage's 5.0 version is nearing completion. Which introduce many new features like Animated ImageView and Transformer. We also provide a more modularized design used for advanced user customization.
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You can check the latest [5.x branch](https://github.com/SDWebImage/SDWebImage/tree/5.x) to know about the current status. We'd love you to have a try with the beta version and provide any feedback. If you'd love, check [SDWebImage 5.0 Migration Guide](https://github.com/SDWebImage/SDWebImage/wiki/5.0-Migration-guide) and prepare for the migration.
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## Requirements
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- iOS 7.0 or later
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- tvOS 9.0 or later
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- watchOS 2.0 or later
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- macOS 10.9 or later
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- Xcode 7.3 or later
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#### Backwards compatibility
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- For iOS 5 and 6, use [any 3.x version up to 3.7.6](https://github.com/SDWebImage/SDWebImage/tree/3.7.6)
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- For iOS < 5.0, please use the last [2.0 version](https://github.com/SDWebImage/SDWebImage/tree/2.0-compat).
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## Getting Started
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- Read this Readme doc
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- Read the [How to use section](https://github.com/SDWebImage/SDWebImage#how-to-use)
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- Read the [Documentation @ CocoaDocs](http://cocoadocs.org/docsets/SDWebImage/)
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- Try the example by downloading the project from Github or even easier using CocoaPods try `pod try SDWebImage`
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- Read the [Installation Guide](https://github.com/SDWebImage/SDWebImage/wiki/Installation-Guide)
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- Read the [SDWebImage 4.0 Migration Guide](Docs/SDWebImage-4.0-Migration-guide.md) to get an idea of the changes from 3.x to 4.x
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- Read the [Common Problems](https://github.com/SDWebImage/SDWebImage/wiki/Common-Problems) to find the solution for common problems
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- Go to the [Wiki Page](https://github.com/SDWebImage/SDWebImage/wiki) for more information such as [Advanced Usage](https://github.com/SDWebImage/SDWebImage/wiki/Advanced-Usage)
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## Who Uses It
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- Find out [who uses SDWebImage](https://github.com/SDWebImage/SDWebImage/wiki/Who-Uses-SDWebImage) and add your app to the list.
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## Communication
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- If you **need help**, use [Stack Overflow](http://stackoverflow.com/questions/tagged/sdwebimage). (Tag 'sdwebimage')
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- If you'd like to **ask a general question**, use [Stack Overflow](http://stackoverflow.com/questions/tagged/sdwebimage).
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- If you **found a bug**, open an issue.
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- If you **have a feature request**, open an issue.
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- If you **want to contribute**, submit a pull request.
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## How To Use
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* Objective-C
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```objective-c
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#import <SDWebImage/UIImageView+WebCache.h>
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...
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[imageView sd_setImageWithURL:[NSURL URLWithString:@"http://www.domain.com/path/to/image.jpg"]
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placeholderImage:[UIImage imageNamed:@"placeholder.png"]];
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```
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* Swift
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```swift
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import SDWebImage
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imageView.sd_setImage(with: URL(string: "http://www.domain.com/path/to/image.jpg"), placeholderImage: UIImage(named: "placeholder.png"))
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```
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- For details about how to use the library and clear examples, see [The detailed How to use](Docs/HowToUse.md)
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## Animated Images (GIF) support
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- Starting with the 4.0 version, we rely on [FLAnimatedImage](https://github.com/Flipboard/FLAnimatedImage) to take care of our animated images.
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- If you use cocoapods, add `pod 'SDWebImage/GIF'` to your podfile.
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- To use it, simply make sure you use `FLAnimatedImageView` instead of `UIImageView`.
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- **Note**: there is a backwards compatible feature, so if you are still trying to load a GIF into a `UIImageView`, it will only show the 1st frame as a static image by default. However, you can enable the full GIF support by using the built-in GIF coder. See [GIF coder](https://github.com/SDWebImage/SDWebImage/wiki/Advanced-Usage#gif-coder)
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- **Important**: FLAnimatedImage only works on the iOS platform. For macOS, use `NSImageView` with `animates` set to `YES` to show the entire animated images and `NO` to only show the 1st frame. For all the other platforms (tvOS, watchOS) we will fallback to the backwards compatibility feature described above
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## Installation
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There are three ways to use SDWebImage in your project:
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- using CocoaPods
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- using Carthage
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- by cloning the project into your repository
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### Installation with CocoaPods
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[CocoaPods](http://cocoapods.org/) is a dependency manager for Objective-C, which automates and simplifies the process of using 3rd-party libraries in your projects. See the [Get Started](http://cocoapods.org/#get_started) section for more details.
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#### Podfile
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```
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platform :ios, '7.0'
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pod 'SDWebImage', '~> 4.0'
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```
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##### Swift and static framework
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Swift project previously have to use `use_frameworks!` to make all Pods into dynamic framework to let CocoaPods works.
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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 `use_frameworks!`:
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```
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platform :ios, '8.0'
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# Uncomment the next line when you want all Pods as static framework
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# use_modular_headers!
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pod 'SDWebImage', :modular_headers => true
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```
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See more on [CocoaPods 1.5.0 — Swift Static Libraries](http://blog.cocoapods.org/CocoaPods-1.5.0/)
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If not, you still need to add `use_frameworks!` to use SDWebImage as dynamic framework:
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```
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platform :ios, '8.0'
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use_frameworks!
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pod 'SDWebImage'
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```
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#### Subspecs
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There are 4 subspecs available now: `Core`, `MapKit`, `GIF` and `WebP` (this means you can install only some of the SDWebImage modules. By default, you get just `Core`, so if you need `WebP`, you need to specify it).
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Podfile example:
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```
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pod 'SDWebImage/WebP'
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```
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### Installation with Carthage (iOS 8+)
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[Carthage](https://github.com/Carthage/Carthage) is a lightweight dependency manager for Swift and Objective-C. It leverages CocoaTouch modules and is less invasive than CocoaPods.
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To install with carthage, follow the instruction on [Carthage](https://github.com/Carthage/Carthage)
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#### Cartfile
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```
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github "SDWebImage/SDWebImage"
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```
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### Installation by cloning the repository
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- see [Manual install](Docs/ManualInstallation.md)
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### Import headers in your source files
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In the source files where you need to use the library, import the header file:
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```objective-c
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#import <SDWebImage/UIImageView+WebCache.h>
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```
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### Build Project
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At this point your workspace should build without error. If you are having problem, post to the Issue and the
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community can help you solve it.
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## Author
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- [Olivier Poitrey](https://github.com/rs)
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## Collaborators
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- [Konstantinos K.](https://github.com/mythodeia)
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- [Bogdan Poplauschi](https://github.com/bpoplauschi)
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- [Chester Liu](https://github.com/skyline75489)
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- [DreamPiggy](https://github.com/dreampiggy)
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- [Wu Zhong](https://github.com/zhongwuzw)
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## Licenses
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All source code is licensed under the [MIT License](https://raw.github.com/SDWebImage/SDWebImage/master/LICENSE).
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## Architecture
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<p align="center">
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<img src="Docs/SDWebImageClassDiagram.png" title="SDWebImage class diagram">
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</p>
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<p align="center">
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<img src="Docs/SDWebImageSequenceDiagram.png" title="SDWebImage sequence diagram">
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</p>
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