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开源软件介绍：

FLAnimatedImage is a performant animated GIF engine for iOS:

• Plays multiple GIFs simultaneously with a playback speed comparable to desktop browsers
• Honors variable frame delays
• Behaves gracefully under memory pressure
• Eliminates delays or blocking during the first playback loop
• Interprets the frame delays of fast GIFs the same way modern browsers do

It's a well-tested component that powers all GIFs in Flipboard. To understand its behavior it comes with an interactive demo:

Who is this for?

• Apps that don't support animated GIFs yet
• Apps that already support animated GIFs but want a higher performance solution
• People who want to tinker with the code (the corresponding blog post is a great place to start; also see the To Do section below)

Installation & Usage

FLAnimatedImage is a well-encapsulated drop-in component. Simply replace your UIImageView instances with instances of FLAnimatedImageView to get animated GIF support. There is no central cache or state to manage.

If using CocoaPods, the quickest way to try it out is to type this on the command line:

$ pod try FLAnimatedImage

To add it to your app, copy the two classes FLAnimatedImage.h/.m and FLAnimatedImageView.h/.m into your Xcode project or add via CocoaPods by adding this to your Podfile:

pod 'FLAnimatedImage', '~> 1.0'

If using Carthage, add the following line into your Cartfile

github "Flipboard/FLAnimatedImage"

If using Swift Package Manager, add the following to your Package.swift or add via XCode:

dependencies: [
    .package(url: "https://github.com/Flipboard/FLAnimatedImage.git", .upToNextMajor(from: "1.0.16"))
],
targets: [
    .target(name: "TestProject", dependencies: ["FLAnimatedImage""])
]

In your code, #import "FLAnimatedImage.h", create an image from an animated GIF, and setup the image view to display it:

FLAnimatedImage *image = [FLAnimatedImage animatedImageWithGIFData:[NSData dataWithContentsOfURL:[NSURL URLWithString:@"https://upload.wikimedia.org/wikipedia/commons/2/2c/Rotating_earth_%28large%29.gif"]]];
FLAnimatedImageView *imageView = [[FLAnimatedImageView alloc] init];
imageView.animatedImage = image;
imageView.frame = CGRectMake(0.0, 0.0, 100.0, 100.0);
[self.view addSubview:imageView];

It's flexible to integrate in your custom image loading stack and backwards compatible to iOS 9.

It uses ARC and the Apple frameworks QuartzCore, ImageIO, MobileCoreServices, and CoreGraphics.

It is capable of fine-grained logging. A block can be set on FLAnimatedImage that's invoked when logging occurs with various log levels via the +setLogBlock:logLevel: method. For example:

// Set up FLAnimatedImage logging.
[FLAnimatedImage setLogBlock:^(NSString *logString, FLLogLevel logLevel) {
    // Using NSLog
    NSLog(@"%@", logString);

    // ...or CocoaLumberjackLogger only logging warnings and errors
    if (logLevel == FLLogLevelError) {
        DDLogError(@"%@", logString);
    } else if (logLevel == FLLogLevelWarn) {
        DDLogWarn(@"%@", logString);
    }
} logLevel:FLLogLevelWarn];

Since FLAnimatedImage is licensed under MIT, it's compatible with the terms of using it for any app on the App Store.

Release process

1. Bump version in FLAnimatedImage.podspec, update CHANGES, and commit.
2. Tag commit with > git tag -a <VERSION> -m "<VERSION>" and > git push --tags.
3. Submit Podspec to Trunk with > pod trunk push FLAnimatedImage.podspec (ensure you're auth'ed).

To Do

• Support other animated image formats such as APNG or WebP (WebP support implemented here)
• Integration into network libraries and image caches
• Investigate whether FLAnimatedImage should become a UIImage subclass
• Smarter buffering
• Bring demo app to iPhone

This code has successfully shipped to many people as is, but please do come with your questions, issues and pull requests!

Select apps using FLAnimatedImage

(alphabetically)

• Close-up
• Design Shots
• Dropbox
• Dumpert
• Ello
• Facebook
• Flipboard
• getGIF
• Gifalicious
• HashPhotos
• Instagram
• LiveBooth
• lWlVl Festival
• Medium
• Pinterest
• Slack
• Telegram
• Zip Code Finder

If you're using FLAnimatedImage in your app, please open a PR to add it to this list!