MPMoviePlayerController not working in iOS 5 xcode

问题:

I'm having problems playing a movie with the new xcode that comes with iOS 5 beta. I created a simple project (with storyboards and all), and added this code to a button:

MPMoviePlayerController *moviePlayer;
NSString *path = [[NSBundle mainBundle] pathForResource:@"position" ofType:@"m4v"];
NSURL *videoURL = [NSURL fileURLWithPath:path];
moviePlayer = [[MPMoviePlayerController alloc] initWithContentURL:videoURL];
//[moviePlayer setControlStyle:MPMovieControlStyleDefault];
[moviePlayer.view setFrame: self.view.bounds];  // player's frame must match parent's
[self.view addSubview: moviePlayer.view];
[moviePlayer prepareToPlay];
[moviePlayer play];

The confusing thing is that it works perfectly when I throw the code into a project built with a previous version of xcode (specifically the one that comes with iOS 4.3).

Any ideas?

回答1:

New to Objective-C but I'll give a shot at it. With Xcode 4.2 (which offers to code for iOS5), by default, new projects have ARC (Automatic Reference Counting) turned on. For the code you gave, since you declare the moviePlayer inside this block of code, moviePlayer automatically gets released when it steps out of the block. In older projects, moviePlayer would just linger on, potentially creating a memory leak. I got it working in with the default Xcode 4.2 ARC setting turned on by declaring moviePlayer in the header file of the class, which means it gets released only when the object instance of that class is released.

回答2:

MPMoviePlayerController *moviePlayer;

put it on header (.h) file and its work

回答3:

I found the solution in this code:

movieView = [moviePlayer view];

[movieView setFrame: CGRectMake(0, 0, 1024, 768)];

回答4:

Try this..it works in iOS 5. You can edit the code to have it play with an IBAction button. Good luck

#import <UIKit/UIKit.h>
#import <MediaPlayer/MediaPlayer.h>
@interface Playing_Video_FilesViewController : UIViewController
@property (nonatomic, strong) MPMoviePlayerController *moviePlayer;
@property (nonatomic, strong) UIButton *playButton;
@end
 - (void) startPlayingVideo:(id)paramSender{
  NSBundle *mainBundle = [NSBundle mainBundle];
  NSString *urlAsString = [mainBundle pathForResource:@"Sample"
                                               ofType:@"m4v"];
  NSURL    *url = [NSURL fileURLWithPath:urlAsString];
  if (self.moviePlayer != nil){
    [self stopPlayingVideo:nil];
}

  self.moviePlayer = [[MPMoviePlayerController alloc] initWithContentURL:url];
  if (self.moviePlayer != nil){
    [[NSNotificationCenter defaultCenter]
     addObserver:self
     selector:@selector(videoHasFinishedPlaying:)
     name:MPMoviePlayerPlaybackDidFinishNotification
     object:self.moviePlayer];
    NSLog(@"Successfully instantiated the movie player.");

    self.moviePlayer.scalingMode = MPMovieScalingModeAspectFit;

    [self.moviePlayer play];
    [self.view addSubview:self.moviePlayer.view];
    [self.moviePlayer setFullscreen:YES
                           animated:YES];
  } else {
    NSLog(@"Failed to instantiate the movie player.");
} 
}
- (void) stopPlayingVideo:(id)paramSender {
  if (self.moviePlayer != nil){
    [[NSNotificationCenter defaultCenter]
     removeObserver:self
     name:MPMoviePlayerPlaybackDidFinishNotification
     object:self.moviePlayer];
    [self.moviePlayer stop];
    if ([self.moviePlayer.view.superview isEqual:self.view]){
      [self.moviePlayer.view removeFromSuperview];
} }
}
- (void) viewDidUnload{
  self.playButton = nil;
  [self stopPlayingVideo:nil];
  self.moviePlayer = nil;
  [super viewDidUnload]; 
}
- (void) videoHasFinishedPlaying:(NSNotification *)paramNotification{
  /* Find out what the reason was for the player to stop */
  NSNumber *reason =
  [paramNotification.userInfo
   valueForKey:MPMoviePlayerPlaybackDidFinishReasonUserInfoKey];
  if (reason != nil){
    NSInteger reasonAsInteger = [reason integerValue];
    switch (reasonAsInteger){
      case MPMovieFinishReasonPlaybackEnded:{
        /* The movie ended normally */
break; }
      case MPMovieFinishReasonPlaybackError:{
        /* An error happened and the movie ended */
        break; 
}
case MPMovieFinishReasonUserExited:{
        /* The user exited the player */
        break;
} 
}
    NSLog(@"Finish Reason = %ld", (long)reasonAsInteger);
    [self stopPlayingVideo:nil];
  } /* if (reason != nil){ */ 
} 

回答5:

// link the method to a button and it will work in iOS5
-(void)playMovie

    {
   NSURL *url = [NSURL fileURLWithPath:[[NSBundle mainBundle] 
                 pathForResource:@"MOVIENAME" ofType:@"MOV"]];
    moviePlayer =  [[MPMoviePlayerController alloc]
                 initWithContentURL:url];

    [[NSNotificationCenter defaultCenter] addObserver:self
                   selector:@selector(moviePlayBackDidFinish:)
                   name:MPMoviePlayerPlaybackDidFinishNotification
                   object:moviePlayer];

    moviePlayer.controlStyle = MPMovieControlStyleDefault;
    moviePlayer.shouldAutoplay = YES;
    [self.view addSubview:moviePlayer.view];
    [moviePlayer setFullscreen:YES animated:YES];
}

回答6:

I had a similar issue on iOS 5 with MPPlayerController and I have checked Apple's example project, the difference was only setting frame so I set frame manually and it worked perfectly.

[[[self moviePlayer] view] setFrame:CGRectMake(0, 0, 320, 480)];