• 1、导入头文件

  import ImageIO

• 2、示例代码

      class ViewController: UIViewController {
      @IBOutlet weak var imgView: UIImageView!
      override func viewDidLoad() {
          super.viewDidLoad()
        
        // 1、加载gif图片，并转成Data类型
        guard let imgPath = Bundle.main.path(forResource: "dancer.gif", ofType: nil) else { return }
        guard let imgData = NSData(contentsOfFile: imgPath) else { return }
        
        // 2、从data中读取数据：将data转成CGImageSource对象
        guard let imgSource = CGImageSourceCreateWithData(imgData, nil) else {
            return
        }
        
        // 3、获取在CGImageSource中图片的个数
        let imgCount = CGImageSourceGetCount(imgSource)
        
        // 4、遍历所有图片
        var imgs = [UIImage]()
        var totalDuration: TimeInterval = 0
        for i in 0..<imgCount {
             // 4.1、取出图片
            guard let cgimg = CGImageSourceCreateImageAtIndex(imgSource, i, nil) else { continue }
            let img = UIImage(cgImage: cgimg)
            if i == 0 { // 保证执行完一次gif后不消失
                imgView.image = img
            }
            imgs.append(img)
            
            // 4.2、取出持续的时间
            guard let properties = CGImageSourceCopyPropertiesAtIndex(imgSource, i, nil) as? NSDictionary else { continue }
            guard let dict = properties[kCGImagePropertyGIFDictionary] as? NSDictionary else { continue }
            guard let duration = dict[kCGImagePropertyGIFDelayTime] as? NSNumber else { continue }
            totalDuration += duration.doubleValue
        }
        
        // 5、设置imageView的属性
        imgView.animationImages = imgs
        imgView.animationDuration = totalDuration
        imgView.animationRepeatCount = 1  // 执行一次，设置为0时无限执行
        
        // 6、开始播放
          imgView.startAnimating()
      }
  }

3、视图效果

dancer.gif