iOS-GIF图播放

封装播放GIF图片的Imageview分类

• GIF图片来源为本地或网络
• 导入系统库： import ImageIO

• 加载本地GIF

 func setGIFImage(gifname: String?) {
        guard let name = gifname else { return }
        guard let path = Bundle.main.path(forResource: name, ofType: nil) else { return }
        guard let data = NSData(contentsOfFile: path) else { return }
        guard let imageSource = CGImageSourceCreateWithData(data as CFData, nil) else { return }
        playGIFWhit(imageSource)
    }

• 加载网络GIF

 func setGIFImage(urlString: String?) {
        guard let urlStr = urlString else { return }
        guard let url = URL(string: urlStr) else { return }
        guard let imageSource = CGImageSourceCreateWithURL(url as CFURL, nil) else { return }
        playGIFWhit(imageSource)
    }

• 播放GIF图

private func playGIFWhit(_ source: CGImageSource) {
    let keyframeCount = CGImageSourceGetCount(source)
    var images = [UIImage]()
    var duration: TimeInterval = 0
    for i in 0..<keyframeCount {
        guard let cgimage = CGImageSourceCreateImageAtIndex(source, i, nil) else { continue }
        guard let properties = CGImageSourceCopyPropertiesAtIndex(source, i, nil) ,
            let giftInfo = (properties as NSDictionary)[kCGImagePropertyGIFDictionary as String] as? NSDictionary,
            let keyframeDuration = giftInfo[kCGImagePropertyGIFDelayTime as String] as? NSNumber else { continue }
        images.append(UIImage(cgImage: cgimage))
        duration += keyframeDuration.doubleValue
    }
    
    self.animationImages = images
    self.animationDuration = duration
    self.animationRepeatCount = 0
    self.startAnimating()
}