Question

我正在编写一个应用程序，它将使用iPad上的MPMoviePlayerController播放视频。问题是，当我在15个小时前停止工作时，应用程序工作正常并播放视频，但现在视频无法播放。 MPMoviePlayerController将显示视频中的第一帧，并且在全屏视图中我可以很好地浏览电影但是当我点击播放时它会立即暂停。我有下面的代码，在调试时我注意到当我调用play时，它发送一个MPMoviePlayerPlaybackStateDidChangeNotification，其中playbackState为MPMoviePlaybackStatePlaying，然后它立即发送另一个MPMoviePlayerPlaybackStateDidChangeNotification通知，其中playbackState为MPMoviePlaybackStatePaused。不确定这是否有帮助，但如果您在我的代码中发现任何错误或有想法，请告诉我，谢谢。

- (void)handleNotification:(NSNotification *)notification {
    if ([[notification name] isEqualToString:MPMoviePlayerPlaybackStateDidChangeNotification]) {
        if (_videoPlayer.playbackState == MPMoviePlaybackStatePlaying) {
            _playButtonLarge.hidden = YES;
            _scrubber.maximumValue = _videoPlayer.duration;
            [_playPauseButton setBackgroundImage:[UIImage imageNamed:@"video_controls_pause.png"] forState:UIControlStateNormal];
            if (_updateScrubberTimer == nil) {
                _updateScrubberTimer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(updateScrubber) userInfo:nil repeats:YES];
            }
        } else if (_videoPlayer.playbackState == MPMoviePlaybackStatePaused || _videoPlayer.playbackState == MPMoviePlaybackStateStopped) {
            [_playPauseButton setBackgroundImage:[UIImage imageNamed:@"video_controls_play.png"] forState:UIControlStateNormal];
            _playButtonLarge.hidden = NO;
            if (_updateScrubberTimer != nil) {
                [_updateScrubberTimer invalidate];
                _updateScrubberTimer = nil;
            }
            if (_videoPlayer.playbackState == MPMoviePlaybackStateStopped) {
                _scrubber.value = 0.0f;
                _timePlayedLabel.text = @"0:00";
                _timeRemainingLabel.text = @"-0:00";
                _videoPlayerBG.hidden = NO;
            }
        }
    } else if ([[notification name] isEqualToString:MPMoviePlayerPlaybackDidFinishNotification]) {
        NSNumber *reason = [[notification userInfo] objectForKey:MPMoviePlayerPlaybackDidFinishReasonUserInfoKey];
        if ([reason intValue] == MPMovieFinishReasonPlaybackEnded) {
            _videoPlayerBG.hidden = NO;
        }
        _scrubber.value = _scrubber.maximumValue;
    }
}

- (void)playPause {
    if ([_videos count] > 0) {
        if (_videoPlayer.playbackState == MPMoviePlaybackStatePaused || _videoPlayer.playbackState == MPMoviePlaybackStateStopped) {
            _playButtonLarge.hidden = YES;
            _videoPlayerBG.hidden = YES;
            if ([_videoPlayer contentURL] == nil) {
                Video *video = [_videos objectAtIndex:0];
                [_videoPlayer setContentURL:video.videoURL];
            }
            if (![_videoPlayer isPreparedToPlay]) {
                [_videoPlayer prepareToPlay];
            }
            [_videoPlayer play];
        } else if (_videoPlayer.playbackState == MPMoviePlaybackStatePlaying) {
            _playButtonLarge.hidden = NO;
            [_videoPlayer pause];
        }
    }
}

Answer 1

我想我想通了，我在每次调用之前都会输入以下代码

if (![_videoPlayer isPreparedToPlay]) { [_videoPlayer prepareToPlay]; }

现在有效，如果有其他人有任何意见，请告诉我

MPMoviePlayerController在iPad上播放错误

1 个答案: