可以尝试使用AVPlayer的timeControlStatus属性来检测视频是否冻结，然后根据需要更新播放状态。以下是一个可能的解决方法的示例代码：

import UIKit
import AVFoundation

class ViewController: UIViewController {
    
    var player: AVPlayer!
    var playerLayer: AVPlayerLayer!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 创建AVPlayer实例
        let videoURL = URL(string: "your_video_url_here")
        player = AVPlayer(url: videoURL!)
        
        // 创建AVPlayerLayer以显示视频
        playerLayer = AVPlayerLayer(player: player)
        playerLayer.frame = view.bounds
        view.layer.addSublayer(playerLayer)
        
        // 监听AVPlayerItem的状态改变通知
        NotificationCenter.default.addObserver(self, selector: #selector(playerItemDidReachEnd), name: .AVPlayerItemDidPlayToEndTime, object: player.currentItem)
        
        // 播放视频
        player.play()
    }
    
    // 播放结束时调用
    @objc func playerItemDidReachEnd() {
        player.seek(to: CMTime.zero) // 将播放进度设置为0，实现循环播放
    }
    
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        
        // 监听AVPlayer的timeControlStatus属性
        player.addObserver(self, forKeyPath: "timeControlStatus", options: [.initial, .new], context: nil)
    }
    
    override func viewDidDisappear(_ animated: Bool) {
        super.viewDidDisappear(animated)
        
        // 移除观察者
        player.removeObserver(self, forKeyPath: "timeControlStatus")
    }
    
    // 观察者回调方法
    override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
        if keyPath == "timeControlStatus" {
            if player.timeControlStatus == .paused {
                // 视频冻结，可以在此处执行相应的操作，比如更新播放按钮的状态或显示一个提示
                print("视频冻结")
            } else if player.timeControlStatus == .playing {
                // 视频继续播放
                print("视频继续播放")
            }
        }
    }
}

在上面的示例代码中，我们创建了一个AVPlayer实例并将其与AVPlayerLayer关联以显示视频。然后，我们添加了一个观察者来监听AVPlayer的timeControlStatus属性的变化。当视频冻结时，我们可以在观察者回调方法中执行相应的操作。