如何从照片库加载动画GIF

问题描述：

在iOS Swift中，我很难将动画GIF从设备照片库加载到UIImageView或从中创建.gif文件。如果它是服务器上的文件或者它在应用程序中是正确的，我可以显示动画GIF。但是，当我从照片库加载它时，我丢失了动画。我发现了一些Objective-C解决方案并尝试将它们转换为Swift，但没有任何运气。

In iOS Swift I'm having difficulty loading an animated GIF from the device photo library to a UIImageView or creating a .gif file from it. I have no problem displaying the animated GIF if it's a file on a server or if it's right in the app. However, when I load it from the photo library, I lose the animation. I found some Objective-C solutions and tried to convert them over to Swift, but haven't had any luck.

这是我到目前为止所拥有的：

Here is what I have so far:

@IBAction func buttonTapped(sender: UIButton) {
    selectPhoto()
}

func selectPhoto() {
    let photoLibraryController = UIImagePickerController()
    photoLibraryController.delegate = self
    photoLibraryController.sourceType = UIImagePickerControllerSourceType.PhotoLibrary

    let mediaTypes:[String] = [kUTTypeImage as String]
    photoLibraryController.mediaTypes = mediaTypes
    photoLibraryController.allowsEditing = false

    self.presentViewController(photoLibraryController, animated: true, completion: nil)
}

// UIImagePickerControllerDelegate
func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {
    let origImage = info[UIImagePickerControllerOriginalImage] as! UIImage

    self.imageView.image = origImage

    picker.dismissViewControllerAnimated(true, completion: nil)

}

最好，我想将照片库图像保存到服务器上的gif文件中。从那里我可以毫不费力地显示它。但是，我需要一些帮助将照片库中的数据转换为某种类型的属性，而不会丢失动画。我是否需要使用像ALAssetsLibrary这样的东西？

Optimally, I would like to save the photo library image to a gif file on the server. From there I have no trouble displaying it. However, I need some help getting the data from the photo library into some type of property, without losing the animation. Do I need to use something like ALAssetsLibrary for this?

谢谢。

答

是的，使用ALAssetsLibrary→现在称为PHAsset。

Yes, Use ALAssetsLibrary → now called PHAsset.

你应该得到gif的NSData，而不是UIImage（因为UIImage只能得到第一帧。）

You should get the NSData of the gif, not UIImage( because UIImage will only get the first frame.)

所以基本上你会做这样的事情：

So basically you would do something like this:

你获得资产

let requestOptions = PHImageRequestOptions()
requestOptions.isSynchronous = true // adjust the parameters as you wish    

PHImageManager.default().requestImageData(for: asset, options: requestOptions, resultHandler: { (imageData, UTI, _, _) in
    if let uti = UTI,let data = imageData ,
        // you can also use UTI to make sure it's a gif
       UTTypeConformsTo(uti as CFString, kUTTypeGIF) {
        // save data here
    }
})

资源： PHAsset

如何从照片库加载动画GIF

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