ios - 显示缩略图 UIImageView

Question

请求生成我的缩略图后，我将如何在 UIImageView 中显示它？

 NSURL *videoURL = [NSURL URLWithString:_videoPathString] ;
moviePlayer = [[MPMoviePlayerController alloc] initWithContentURL:videoURL];
[moviePlayer requestThumbnailImagesAtTimes:[NSArray arrayWithObject:[NSNumber numberWithFloat:2.0f]] timeOption:MPMovieTimeOptionExact];

有什么想法吗？

Answer 1

requestThumbnailImagesAtTimes:timeOption: 方法将在图像请求完成时发布一个 MPMoviePlayerThumbnailImageRequestDidFinishNotification 通知。

您需要缩略图的代码应使用 NSNotificationCenter 订阅此通知，并在收到通知时使用该图像。

例子。

首先注册MPMoviePlayerThumbnailImageRequestDidFinishNotification通知:

[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(handleThumbnailImageRequestFinishNotification:)
                                             name:MPMoviePlayerThumbnailImageRequestDidFinishNotification
                                           object:nil];

然后请求缩略图:

[movie requestThumbnailImagesAtTimes:YOUR_TIMES timeOption:MPMovieTimeOptionExact];

然后获取图片:

-(void)handleThumbnailImageRequestFinishNotification:(NSNotification*)notification
{
    NSDictionary *userInfo = [notification userInfo];
    UIImage *image = [userInfo valueForKey:MPMoviePlayerThumbnailImageKey];
}

来源:MPMoviePlayerController Class Reference