我正在使用AVFoundation为iOS开发自定义视频播放器。我的想法是通过手势（轻击、滑动等）来切换不同的视频。目前在模拟器上，播放器运行得非常顺畅，但当我在实际设备上测试时，视图在3或4次切换后就会变空白。我甚至为我的播放器创建了播放控件，但当视图变空白时，这些控件虽然正确加载，但无法操作。大家有什么想法吗？ 以下是播放器的初始化代码：
- (id)initWithContentURL:(NSString *)aContentURL delegate:(id)aDelegate {
self = [super initWithNibName:@"NoCashMoviePlayer" bundle:nil];
if (self == nil)
return nil;
delegate = aDelegate;
systemPath = [aContentURL retain];
contentURL = [[NSURL alloc]initFileURLWithPath:systemPath];
asset = [AVURLAsset URLAssetWithURL:contentURL options:nil];
playerItem = [AVPlayerItem playerItemWithAsset:asset];
isPaused = false;
controlsHidden = false;
self.player = [[AVPlayer playerWithPlayerItem:playerItem] retain];
duration = self.player.currentItem.asset.duration;
return self;
}
这是播放视频的代码：
-(void)playMovie{
UITapGestureRecognizer *tapRecon = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(toggleControls:)];
[tapRecon setNumberOfTapsRequired:2];
[self.movieContainer addGestureRecognizer:tapRecon];
[tapRecon release];
NSLog(@"Playing item: %@",contentURL);
playerLayer = [AVPlayerLayer playerLayerWithPlayer:player];
[movieContainer.layer addSublayer:playerLayer];
playerLayer.frame = movieContainer.layer.bounds;
playerLayer.videoGravity = AVLayerVideoGravityResizeAspect;
self.seeker.alpha = 1.0;
[self.view addSubview:movieContainer];
[self.movieContainer addSubview:controls];
[self setSlider];
[player play];
player.actionAtItemEnd = AVPlayerActionAtItemEndNone;
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(playerItemDidReachEnd:)
name:AVPlayerItemDidPlayToEndTimeNotification
object:[player currentItem]];
}
选择要播放的剪辑的代码：
-(void)viewSelect: (double) curTime{
self.myView.backgroundColor = [UIColor blackColor];
UISwipeGestureRecognizer *swipeRecognizer = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(handleSwipeFrom:)];
swipeRecognizer.direction = UISwipeGestureRecognizerDirectionRight;
[self.myView addGestureRecognizer:swipeRecognizer];
[swipeRecognizer release];
UISwipeGestureRecognizer *leftRecognizer = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(handleSwipeFromLeft:)];
swipeRecognizer.direction = UISwipeGestureRecognizerDirectionLeft;
[self.myView addGestureRecognizer:leftRecognizer];
[leftRecognizer release];
if(isMain){
[UIView animateWithDuration:0.5 delay:0.0 options:UIViewAnimationTransitionFlipFromLeft animations:^{
self.myView.alpha = 1.0;
moviePlayer = [[NoCashMoviePlayer alloc]initWithContentURL:[self movieURL:vidIndex] delegate:self];
self.moviePlayer.view.frame = self.myView.bounds;
self.moviePlayer.view.autoresizingMask = UIViewAutoresizingFlexibleWidth |UIViewAutoresizingFlexibleHeight;
[self.myView addSubview:moviePlayer.view];
}completion:^(BOOL finished) {
[self.moviePlayer.player seekToTime:CMTimeMake(curTime, 1)];
[self.moviePlayer playMovie];
}];
}else{
[UIView animateWithDuration:0.5 delay:0.0 options:UIViewAnimationTransitionFlipFromLeft animations:^{
self.otherView.alpha = 1.0;
moviePlayer = [[NoCashMoviePlayer alloc]initWithContentURL:[self movieURL:vidIndex] delegate:self];
self.moviePlayer.view.frame = self.otherView.bounds;
self.moviePlayer.view.autoresizingMask = UIViewAutoresizingFlexibleWidth |UIViewAutoresizingFlexibleHeight;
[self.otherView addSubview:moviePlayer.view];
}completion:^(BOOL finished) {
[self.moviePlayer.player seekToTime:CMTimeMake(curTime, 1)];
[self.moviePlayer playMovie];
}];
}
}
最后是手势操作：
- (void)handleSwipeFromLeft:(UISwipeGestureRecognizer *)recognizer {
double elapsedTime = 0.0;
if(vidIndex==0){
vidIndex = 3;
}else vidIndex = vidIndex --;
elapsedTime = [self.moviePlayer currentTimeInSeconds];
[self.moviePlayer stopMovie];
isMain = !isMain;
[self viewSelect: elapsedTime];
}
编辑：尝试为每个视频文件使用不同的AVPlayerLayer，但情况相同，在模拟器中可以运行，但在iPad上无法运行。
编辑2：我使用instruments来分析核心动画性能，当视频正在播放时，它显示约30 fps的帧率，当播放器变空白时，帧率降至1或2 fps。这可能很明显，但如果它有助于提供更多信息.....
编辑3：好了，我终于有所进展，我知道问题出在哪里了，我有一个核心动画内存泄漏，在模拟器中它“工作”，因为计算机比iPad具有更多的内存，但由于iPad的内存非常有限，它会很快停止工作。如果有人对核心动画泄漏有任何建议，那将非常受欢迎。