IOS电影播放器播放一次视频后的未知加载状态MPMoviePlayerController
我试图弄明白为什么在我播放了一次视频后，我会看到一个闪烁的黑屏。我发现当加载状态为MPMovieLoadStatePlayable时，就不会出现黑屏，视频可以顺利播放。但是，一旦加载状态变为MPMovieLoadStateUnknown，视频播放完毕后。我注意到，当加载状态未知时，会出现闪烁的黑屏，可能是因为它必须首先调用prepareToPlay 以下是我如何设置视频：IOS电影播放器播放一次视频后的未知加载状态MPMoviePlayerController,ios,objective-c,mpmovieplayercontroller,mpmovieplayer,Ios,Objective C,Mpmovieplayercontroller,Mpmovieplayer,我试图弄明白为什么在我播放了一次视频后，我会看到一个闪烁的黑屏。我发现当加载状态为MPMovieLoadStatePlayable时，就不会出现黑屏，视频可以顺利播放。但是，一旦加载状态变为MPMovieLoadStateUnknown，视频播放完毕后。我注意到，当加载状态未知时，会出现闪烁的黑屏，可能是因为它必须首先调用prepareToPlay 以下是我如何设置视频： - (void)setVideo:(PFObject *)aVideo { video = aVideo;
- (void)setVideo:(PFObject *)aVideo {
video = aVideo;
if(self.moviePlayer) {
self.moviePlayer = nil;
}
// Get the profile image
PFUser *user = [self.video objectForKey:kFTPostUserKey];
PFFile *profilePictureSmall = [user objectForKey:kFTUserProfilePicSmallKey];
NSString *authorName = [user objectForKey:kFTUserDisplayNameKey];
// Get the video file
PFFile *videoFile = [video objectForKey:kFTPostVideoKey];
NSURL *url = [NSURL URLWithString:videoFile.url];
self.moviePlayer = [[MPMoviePlayerController alloc] init];
[self.moviePlayer.view setFrame:CGRectMake(0.0f,0.0f,320.0f,320.0f)];
[self.moviePlayer setControlStyle:MPMovieControlStyleNone];
[self.moviePlayer setScalingMode:MPMovieScalingModeAspectFill];
[self.moviePlayer setMovieSourceType:MPMovieSourceTypeFile];
[self.moviePlayer setContentURL:url];
[self.moviePlayer requestThumbnailImagesAtTimes:@[ @0.1f, @1.0f ] timeOption:MPMovieTimeOptionExact];
[self.moviePlayer setShouldAutoplay:NO];
[self.moviePlayer.view setBackgroundColor:[UIColor clearColor]];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(movieFinishedCallBack)
name:MPMoviePlayerPlaybackDidFinishNotification
object:self.moviePlayer];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(moviePlayerStateChange:)
name:MPMoviePlayerPlaybackStateDidChangeNotification
object:self.moviePlayer];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(loadStateDidChange:)
name:MPMoviePlayerLoadStateDidChangeNotification
object:self.moviePlayer];
}
- (void)didTapVideoPlayButtonAction:(UIButton *)sender{
[self.playButton setHidden:YES];
[self.moviePlayer prepareToPlay];
[self.moviePlayer requestThumbnailImagesAtTimes:@[ @0.1f, @1.0f ] timeOption:MPMovieTimeOptionExact];
[self.moviePlayer play];
}
-(void)movieFinishedCallBack{
[[NSNotificationCenter defaultCenter] removeObserver:self
name:MPMoviePlayerPlaybackDidFinishNotification
object:self.moviePlayer];
}
-(void)loadStateDidChange:(NSNotification *)notification{
//NSLog(@"loadStateDidChange: %@",notification);
if (self.moviePlayer.loadState == MPMovieLoadStatePlayable) {
NSLog(@"loadState... MPMovieLoadStatePlayable");
}
if (self.moviePlayer.loadState == MPMovieLoadStatePlaythroughOK) {
NSLog(@"loadState... MPMovieLoadStatePlaythroughOK");
}
if (self.moviePlayer.loadState == MPMovieLoadStateStalled) {
NSLog(@"loadState... MPMovieLoadStateStalled");
}
if (self.moviePlayer.loadState == MPMovieLoadStateUnknown) {
NSLog(@"loadState... MPMovieLoadStateUnknown");
//[self.moviePlayer prepareToPlay];
}
}
-(void)moviePlayerStateChange:(NSNotification *)notification{
//NSLog(@"moviePlayerStateChange: %@",notification);
if (self.moviePlayer.playbackState == MPMoviePlaybackStatePlaying){
[self.imageView addSubview:self.moviePlayer.view];
}
if (self.moviePlayer.playbackState == MPMoviePlaybackStateStopped){
NSLog(@"moviePlayer... Stopped");
[self.playButton setHidden:NO];
//[self.moviePlayer.view removeFromSuperview];
[self.moviePlayer prepareToPlay];
}
if (self.moviePlayer.playbackState == MPMoviePlaybackStatePaused){
NSLog(@"moviePlayer... Paused");
[self.moviePlayer stop];
}
f (self.moviePlayer.playbackState == MPMoviePlaybackStateInterrupted){
NSLog(@"moviePlayer... Interrupted");
[self.moviePlayer stop];
}
if (self.moviePlayer.playbackState == MPMoviePlaybackStateSeekingForward){
NSLog(@"moviePlayer... Forward");
}
if (self.moviePlayer.playbackState == MPMoviePlaybackStateSeekingBackward){
NSLog(@"moviePlayer... Backward");
}
}
我试过了，但这并没有让球员做好上场的准备。有什么想法/建议/帮助吗 视频可以播放一次，但以后不能再播放这一事实并不是MPMoviePlayerController的内置功能-我从来没有使用过MPMoviePlayerController这样的功能-所以你应该寻找其他可能发生的事情，以破坏你的MPMoviePlayerController的状态，例如将其
contentURLMPLoadStateUnknown- 我注意到，配置MPMoviePlayerController的方法不是普通的方法；事实上，它是属性的setter（
）。这可能与问题有关，因为这意味着每次任何代码在任何地方显示video
时，您都在运行此方法，这意味着拆下整个电影播放器并制作一个新的。现在假设其他地方的某个代码显示video=/…
或其他一些错误值。这肯定会使您的movie player视图变黑并阻止进一步播放。我建议中断此方法以查看是否发生这种情况。然后设置更好的体系结构：setter应该只设置属性，而不是更多。电影播放器的配置应该只发生一次，并且需要以其自己的方法进行video=nil - 请注意，如果您意外地在MPMoviePlayerController上生成了多个。有一条法律规定，“只能有一个”——如果另一个MPMoviePlayerController出现并调用
，则所有其他MPMoviePlayerController都将被禁用prepareToPlay
（最后，尽管这不是问题的直接根源，但请注意，您确定的加载状态不正确。您使用的是相等，但这很容易失败，因为加载状态是位掩码；您必须使用逻辑和来比较掩码。）首先，这个代码是错误的：
self.moviePlayer.loadState==/…MPMovieLoadStateUnknownvideovideo=/…video=nil