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iOS 11在UIImageView中显示动画gif

ios11 animated-gif uiimageview animation ios

matt · 技术社区 · 8 年前

我以为iOS 11最终会为动画GIF带来原生支持?但我试过了,没有看到任何动画:

let im = UIImage(named:"wireframe.gif")!
let iv = UIImageView(image:im)
iv.animationImages = [im] // didn't help
iv.frame.origin = CGPoint(0,100)
iv.frame.size = im.size
self.view.addSubview(iv)
delay(2) {
    iv.startAnimating() // nope
}

2 回复 | 直到 8 年前

matt 8 年前

iOS 11确实带来了对动画GIF的原生理解,但令人恼火的是,这种理解并没有内置到UIImageView中。这仍然取决于你

https://developer.apple.com/library/content/samplecode/UsingPhotosFramework/Listings/Shared_AnimatedImage_swift.html

该代码实现了一个AnimatedImage类,它本质上是从原始动画gif中提取的CGImages的集合。因此,使用该类,我们可以在UIImageView中显示动画gif并设置动画,如下所示:

let url = Bundle.main.url(forResource: "wireframe", withExtension: "gif")!
let anim = AnimatedImage(url: url)!
var arr = [CGImage]()
for ix in 0..<anim.frameCount {
    arr.append(anim.imageAtIndex(index: ix)!)
}
var arr2 = arr.map {UIImage(cgImage:$0)}
let iv = UIImageView()
iv.animationImages = arr2
iv.animationDuration = anim.duration
iv.frame.origin = CGPoint(0,100)
iv.frame.size = arr2[0].size
self.view.addSubview(iv)
delay(2) {
    iv.startAnimating()
}