objective-c - ios sdk 在将选项卡栏附加到主窗口之前在 View Controller 中附加并播放视频文件

Question

我有一个非 ARC 项目。所以我正在维护它的内存管理。它有一个选项卡栏和导航 Controller 。在启动时，在显示选项卡栏之前，我必须显示 5 秒的启动视频之类的东西。所以我有两个问题

在将选项卡栏 Controller 附加到主窗口之前显示 View Controller 而不会泄漏的最佳且简单的方法。以下是我当前的技术和代码，但代码分析器向我显示了视频 Controller 中潜在的泄漏。

self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen]bounds]] autorelease];

UIViewController *viewController = [[MyViewController alloc] initWithNibName:@"MyViewController" bundle:nil] ;
myNavigationController = [ [ UINavigationController alloc ] initWithRootViewController: viewController ];
[viewController release]; 

NSMutableArray *viewControllers;
viewControllers = [[NSMutableArray alloc] init];
[viewControllers addObject: myNavigationController];  //Tab 1
myNavigationController release];
// ADD Tab 2    //ADD Tab 3    //ADD Tab 4
self.tabBarController = [[[UITabBarController alloc] init] autorelease];
self.tabBarController.viewControllers = viewControllers;
[viewControllers release];
//Add video contoller before showing tabs
self.videoController = [[VideoPlayViewController alloc] initWithNibName:@"VideoPlayViewController" bundle:nil];
[self.window addSubview:videoController.view];
[self.window makeKeyAndVisible];

---

这是我的视频播放器 Controller 代码

- (void)viewDidLoad
{
   [super viewDidLoad];
   MPMoviePlayerController *moviePlayer =  [[MPMoviePlayerController alloc] initWithContentURL:@"some url"];
    //------ init code in between and added observer to movie playback finish callback ------
   [self.view addSubview:moviePlayer.view ]; //show potential leak here if i not release moviePlayer
    //[moviePlayer release]; //if i release here controller show me black window with no video playing
}

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

    MPMoviePlayerController *player = [notification object];
    [[NSNotificationCenter defaultCenter] removeObserver:self
                                                    name:MPMoviePlayerDidExitFullscreenNotification 
                                                  object:nil];
    [player stop];
    [player.view removeFromSuperview];
    [player release]; //show incorrect decrement of reference count of an object that is not owned at this point by caller
    //Fire notification to add tab bar as root view controller
}

播放视频后，我会在我的应用程序代理中收到通知，然后

 [videoController.view removeFromSuperview];
 [self.videoController release];
 self.videoController = nil;
 self.window.rootViewController = self.tabBarController;

---

和我的主应用程序委托(delegate)像往常一样释放

- (void)dealloc {
    [_window release];
    [_tabBarController release];
    [super dealloc];
}

我认为我正确地解释了我的问题。请任何人有更好的方法来做到这一点。

谢谢

Answer 1

在 viewDidLoad 之外声明 moviePlayer 变量，然后在 moviePlayBackDidFinish 中释放它。您要添加对它的引用，然后仅删除该引用。您收到有关泄漏的通知的原因是 moviePlayer 从未发布 - 并且根据您当前的代码设置，您无法发布它。

MPMoviePlayerController *moviePlayer; //keep reference to moviePlayer
- (void)viewDidLoad
{
    [super viewDidLoad];
    moviePlayer =  [[MPMoviePlayerController alloc] initWithContentURL:@"some url"];
    [self.view addSubview:moviePlayer.view ];
}

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

    [[NSNotificationCenter defaultCenter] removeObserver:self
                                                    name:MPMoviePlayerDidExitFullscreenNotification 
                                                  object:nil];
    [moviePlayer stop];
    [moviePlayer.view removeFromSuperview];
    [moviePlayer release];
}