iphone ios xcode 4.2 - EXC_BAD_ACCESS信號

Question

那麼我設計的iPhone應用程序將在本地播放視頻。當我點擊模擬器中的按鈕時，它會完美播放，但當它停止時或手動結束時，它會崩潰，並一直給我提出這個問題。我嘗試清理，構建，分析並再次運行，但仍然一樣。任何幫助？

我的代碼是：

MoviePlayerViewController.h

#import <UIKit/UIKit.h> 
#import <Foundation/Foundation.h> 
#import <MediaPlayer/MediaPlayer.h> 

@interface MoviePlayerViewController : UIViewController { 

} 
-(IBAction)playMovie:(id)sender; 
@end 

和MoviePlayerViewController.m主鑽頭

- (IBAction)playMovie:(id)sender { 
    NSString *movpath = [[NSBundle mainBundle] pathForResource:@"think" ofType:@"mp4"]; 
    MPMoviePlayerViewController *mpviewController = [[MPMoviePlayerViewController alloc] 
                initWithContentURL:[NSURL fileURLWithPath:movpath]]; 
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(playbackFinishedCallback:) 
               name:MPMoviePlayerPlaybackDidFinishNotification object:nil]; 

    [self.view addSubview:mpviewController.view]; 
    MPMoviePlayerController *mp = [mpviewController moviePlayer]; 
    [mp prepareToPlay]; 
    mp.scalingMode=MPMovieScalingModeAspectFill; 
    [[mpviewController moviePlayer] play]; 
} 

- (void)playbackFinishedCallback:(NSNotification *)notification { 
    MPMoviePlayerViewController *mpviewController = [notification object]; 
    [[NSNotificationCenter defaultCenter] removeObserver:self name:MPMoviePlayerPlaybackDidFinishNotification object:mpviewController]; 
    [mpviewController.view removeFromSuperview]; 
    [mpviewController release]; 
} 

Answer 1

您是否嘗試過製作電影播放控制器吶伊娃

#import <UIKit/UIKit.h> 
    #import <Foundation/Foundation.h> 
    #import <MediaPlayer/MediaPlayer.h> 

    @interface MoviePlayerViewController : UIViewController { 

    } 

    @property (nonatomic, retain) MPMoviePlayerViewController *mpviewController; 

    -(IBAction)playMovie:(id)sender; 
    @end 

然後你就可以在實現文件做一些像這樣

@synthesize mpviewController; 

    - (IBAction)playMovie:(id)sender { 
     NSString *movpath = [[NSBundle mainBundle] pathForResource:@"think" ofType:@"mp4"]; 
     MPMoviePlayerViewController *mpController = [[MPMoviePlayerViewController alloc] 
                 initWithContentURL:[NSURL fileURLWithPath:movpath]]; 

     self.mpviewController = mpController; 
     [mpController release];            

     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(playbackFinishedCallback:) 
                name:MPMoviePlayerPlaybackDidFinishNotification object:nil]; 

     [self.view addSubview:self.mpviewController.view]; 
     MPMoviePlayerController *mp = [self.mpviewController moviePlayer]; 
     [mp prepareToPlay]; 
     mp.scalingMode=MPMovieScalingModeAspectFill; 
     [[self.mpviewController moviePlayer] play]; 
    } 

    - (void)playbackFinishedCallback:(NSNotification *)notification { 

     [[NSNotificationCenter defaultCenter] removeObserver:self name:MPMoviePlayerPlaybackDidFinishNotification object:mpviewController]; 
     [mpviewController.view removeFromSuperview]; 
    } 

    - (void)viewDidUnload { 
    self.mpviewController = nil; 
    } 

    - (void)dealloc{ 
    self.mpviewController = nil; 

    [super dealloc]; 
    } 

Answer 2

有在代碼中的幾個問題，這裏有修復：

1>刪除[mpviewController release];，因爲它是cr使用返回*autorelease*對象的方法進行訪問（[notification object]）。釋放mpviewController對象將其聲明爲實例變量並釋放它並使其爲零。

if(mpviewController != nil) 
{ 
[mpviewController release]; 
mpviewController = nil; 
} 

2>正如你所宣佈mpviewController作爲實例變量，沒有必要通過[notification object]訪問mpviewController變量，因爲它不存在，你有沒有當你添加觀察者通知中心提供它。

3>替換的代碼下面的行：

[[NSNotificationCenter defaultCenter] removeObserver:self name:MPMoviePlayerPlaybackDidFinishNotification object:mpviewController]; 

與

[[NSNotificationCenter defaultCenter] removeObserver:self name:MPMoviePlayerPlaybackDidFinishNotification object:nil]; 

闡釋：當添加觀察者您沒有提供任何對象的信息，但在去除時你

所以現在你的代碼將變成：

- (void)playbackFinishedCallback:(NSNotification *)notification { 

    [[NSNotificationCenter defaultCenter] removeObserver:self name:MPMoviePlayerPlaybackDidFinishNotification object:nil]; 
    [mpviewController.view removeFromSuperview]; 
    if(mpviewController != nil) 
    { 
     [mpviewController release]; 
     mpviewController = nil; 
    } 
} 

此外，在此控制器的- (void) dealloc中，您應該編寫用於發佈mpviewController的類似代碼。

感謝，