在MPMoviePlayerController上調用renderInContext

Question

我試圖以編程方式從MPMoviePlayerController視頻的當前幀創建一個圖像。我使用renderInContext呼籲玩家的view.layer但創建的圖像是全黑與視頻播放器的控制，但我期待看到該視頻的當前幀

我的代碼（http://pastie.org/1020066）

UIGraphicsBeginImageContext(moviePlayer.view.bounds.size); 
[moviePlayer.view.layer renderInContext:UIGraphicsGetCurrentContext()]; 
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext(); 
UIGraphicsEndImageContext(); 

// I also tried this code (same results) 

// moviePlayer is a subview of videoView (UIView object) 
UIGraphicsBeginImageContext(videoView.bounds.size); 
[videoView.layer renderInContext:UIGraphicsGetCurrentContext()]; 
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext(); 
UIGraphicsEndImageContext(); 

Answer 1

如果您試圖獲取電影的縮略圖，則應該檢查MPMoviePlayerController的thumbnailImageAtTime:timeOption:方法。