ios - swift 3 : how to save Animated images from imageView (GIF)?

Question

我是 swift 的新手，我有一些 images 在一个 imageView 中动画，现在我想把它保存在画廊中，因为我们保存简单的图像，我该怎么做？

imageView.animationImages = [
            UIImage(named:"1.jpg")!,
            UIImage(named:"2.jpg")!,
            UIImage(named:"3.jpg")!,
            UIImage(named:"4.jpg")!,
            UIImage(named:"5.jpg")!
        ]

        imageView.animationDuration = 3
        imageView.startAnimating()

我们将不胜感激...(:

Answer 1

请引用这里的代码 -> swift-create-a-gif-from-images-and-turn-it-into-nsdata

上面的代码是针对OS X的，所以稍微调整了一下。

导入 ImageIO 和 MobileCoreServices

func createGIF(with images: [UIImage], name: URL, loopCount: Int = 0, frameDelay: Double) {

    let destinationURL = name
    let destinationGIF = CGImageDestinationCreateWithURL(destinationURL as CFURL, kUTTypeGIF, images.count, nil)!

    // This dictionary controls the delay between frames
    // If you don't specify this, CGImage will apply a default delay
    let properties = [
        (kCGImagePropertyGIFDictionary as String): [(kCGImagePropertyGIFDelayTime as String): frameDelay]
    ]


    for img in images {
        // Convert an UIImage to CGImage, fitting within the specified rect
        let cgImage = img.cgImage
        // Add the frame to the GIF image
        CGImageDestinationAddImage(destinationGIF, cgImage!, properties as CFDictionary?)
    }

    // Write the GIF file to disk
    CGImageDestinationFinalize(destinationGIF)
}

这样使用:

let documentsURL = FileManager.default.urls(for: .documentDirectory,
                                                   in: .userDomainMask).first
let path = documentsURL!.appendingPathComponent("1.gif")
createGIF(with: images, name: path, frameDelay: 0.1)
// you can check the path and open it in Finder, then you can see the file
print(path)

我也在github上做了一个demo -> saveImagesAsGif