我正在使用 MPMoviePlayerViewController
播放视频。在我的应用程序中,我使用标准的 MPMoviePlayerController
类播放应用程序中的视频。它在 iOS 7 和 8 上运行良好
第一次解决这个问题时效果很好,但是在观看了 1 个视频后,如果您尝试观看其他内容,应用程序会在 MPMoviePlayerController
的播放方法上崩溃并出现错误:
: CGContextSaveGState: invalid context 0x0
: CGContextClipToRect: invalid context 0x0
: CGContextTranslateCTM: invalid context 0x0
: CGContextDrawShading: invalid context 0x0
: CGContextRestoreGState: invalid context 0x0
*** -[MPMoviePlayerController retain]: message sent to deallocated instance 0x1e5718b0
我不明白为什么会发生这种情况。
这是我的代码:
AFPlayerViewController.h
@property (strong, nonatomic) MPMoviePlayerViewController *playerViewController;
- (id)initWithContentURL:(NSString*)movieUrl
andSubtitlePath:(NSString*)subPath
withTypeServer:(NSString*)serverType
withName:(NSString*)name
withEpisodeId:(NSString*)episodeId
withFilmId:(NSString*)filmId
withDuration:(NSInteger)targetDuration
withSeason:(NSString*)seasonId;
AFPlayerViewController.m
@synthesize playerViewController;
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
if (_movieURL) {
self.playerViewController = [[MPMoviePlayerViewController alloc] initWithContentURL: _movieURL];
self.playerViewController.moviePlayer.initialPlaybackTime = -1.f;
self.playerViewController.moviePlayer.shouldAutoplay = NO;
[self.playerViewController.moviePlayer setControlStyle:MPMovieControlStyleNone];
[self.playerViewController.moviePlayer setFullscreen:NO animated:YES];
self.playerViewController.moviePlayer.scalingMode = MPMovieScalingModeAspectFit;
[self.playerViewController.view setFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
[self.view addSubview:self.playerViewController.view];
[NSLayoutConstraint alightTopBotLeftRight:self.playerViewController.view inView:self.view];
[self.playerViewController.moviePlayer prepareToPlay];
[self.playerViewController.moviePlayer play];
[self receiveNotificationPlayerViewController];
}
}
- (void)receiveNotificationPlayerViewController {
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(durationAvailable:)
name:MPMovieDurationAvailableNotification
object:self.playerViewController.moviePlayer];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(loadStateDidChange:)
name:MPMoviePlayerLoadStateDidChangeNotification
object:self.playerViewController.moviePlayer];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(playbackStateDidChange:)
name:MPMoviePlayerPlaybackStateDidChangeNotification
object:self.playerViewController.moviePlayer];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(sourceTypeAvailable:)
name:MPMovieSourceTypeAvailableNotification
object:self.playerViewController.moviePlayer];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(readyForDisplay:)
name:MPMoviePlayerReadyForDisplayDidChangeNotification
object:self.playerViewController.moviePlayer];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(orientationDidChange:)
name:UIDeviceOrientationDidChangeNotification
object:self.playerViewController.moviePlayer];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(didFinishAVideo:)
name:MPMoviePlayerPlaybackDidFinishNotification
object:self.playerViewController.moviePlayer];
}
- (void) durationAvailable: (NSNotification*) notification {
NSLog(@"1");
}
- (void) loadStateDidChange: (NSNotification*) notification {
NSLog(@"2");
if ([self.playerViewController.moviePlayer loadState] != MPMovieLoadStateUnknown) {
[[NSNotificationCenter defaultCenter] removeObserver:self
name:MPMoviePlayerLoadStateDidChangeNotification
object:nil];
}
}
- (void) playbackStateDidChange: (NSNotification*) notification {
NSLog(@"3");
switch (self.playerViewController.moviePlayer.playbackState) {
case MPMoviePlaybackStateSeekingForward:
case MPMoviePlaybackStateSeekingBackward:
break;
case MPMoviePlaybackStatePaused: {
NSLog(@"pause");
}
break;
case MPMoviePlaybackStateStopped: {
NSLog(@"stop");
}
break;
case MPMoviePlaybackStateInterrupted:{
NSLog(@"interrupted");
}
break;
case MPMoviePlaybackStatePlaying: {
NSLog(@"playing");
}
break;
default:
break;
}
}
- (void) sourceTypeAvailable: (NSNotification*) notification {
NSLog(@"4");
}
- (void) readyForDisplay: (NSNotification*) notification {
NSLog(@"5");
}
- (void)orientationDidChange: (NSNotification*)notification {
NSLog(@"6");
}
- (void)didFinishAVideo:(NSNotification*)notification {
[self removeNotification];
}
- (void)removeNotification {
[[NSNotificationCenter defaultCenter] removeObserver:self
name:MPMovieDurationAvailableNotification
object:self.playerViewController.moviePlayer];
[[NSNotificationCenter defaultCenter] removeObserver:self
name:MPMoviePlayerLoadStateDidChangeNotification
object:self.playerViewController.moviePlayer];
[[NSNotificationCenter defaultCenter] removeObserver:self
name:MPMoviePlayerPlaybackDidFinishNotification
object:self.playerViewController.moviePlayer];
[[NSNotificationCenter defaultCenter] removeObserver:self
name:MPMoviePlayerPlaybackStateDidChangeNotification
object:self.playerViewController.moviePlayer];
[[NSNotificationCenter defaultCenter] removeObserver:self
name:MPMovieSourceTypeAvailableNotification
object:self.playerViewController.moviePlayer];
[[NSNotificationCenter defaultCenter] removeObserver:self
name:MPMoviePlayerReadyForDisplayDidChangeNotification
object:self.playerViewController.moviePlayer];
[[NSNotificationCenter defaultCenter] removeObserver:self
name:UIDeviceOrientationDidChangeNotification
object:self.playerViewController.moviePlayer];
}
AppDelegate.h
@property (strong, nonatomic) AFPlayerViewController *player;
AppDelegate.m
+ (AppDelegate *)shareInstance{
return (AppDelegate *)[[UIApplication sharedApplication] delegate];
}
- (UIViewController *)currentVisibleController{
id rootController = self.window.rootViewController;
if ([rootController isKindOfClass:[UINavigationController class]]) {
UINavigationController *navigationController = (UINavigationController *)rootController;
return navigationController.topViewController;
}
if ([rootController isKindOfClass:[UITabBarController class]]) {
UITabBarController *tabbarController = (UITabBarController *)rootController;
id topViewController = [tabbarController.viewControllers objectAtIndex:tabbarController.selectedIndex];
if ([topViewController isKindOfClass:[UINavigationController class]]) {
UINavigationController *navi = (UINavigationController *)topViewController;
return navi.topViewController;
}
return topViewController;
}
return self.window.rootViewController;
}
当我想播放视频时:
[AppDelegate shareInstance].player = [[AFPlayerViewController alloc] initWithContentURL:link
andSubtitlePath:subtitle
withTypeServer:serverType
withName:nameFilm
withEpisodeId:epObject.episodeId
withFilmId:filmId
withDuration:lastDuration
withSeason:epObject.id_season];
[[AppDelegate shareInstance].currentVisibleController presentViewController:[AppDelegate shareInstance].player animated:NO completion:^{
}];
最佳答案
正如@Bannings 所说,您很可能会收到错误消息,因为通知被发送到已删除的 Controller 对象。尽管如此,我还有一些其他建议可以改进您的代码(而且我很确定会消除错误)。
首先,文档说您应该注册 MPMoviePlayerLoadStateDidChangeNotification
并使用 loadState
方法来确定电影何时准备好开始播放。我强烈建议您这样做。
其次,每次出现 View 时,您都在实例化一个 MPMoviePlayerController
。我建议您创建一个 AFPlayerViewController
和一个 MPMoviePlayerController
。每当您想播放另一部电影时,都显示相同的 AFPPlayerViewController
。
当您第一次实例化 MPMoviePlayerController
时,您需要一个 URL,用于它的 init
方法,但是可以使用 contentURL
启动后续电影> MPMoviePlayerController
的属性
我的建议的另一个好处是,用户可以很容易地暂停电影,转到不同的 View ,然后在返回电影 View 时快速恢复。
关于ios - 在 iOS 6 上开始播放视频时 MPMoviePlayerController 崩溃,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/30435818/