UINavigationController在模式下顯示時不釋放內存

Question

當呈現包含UITableViewController作爲模式視圖的UINavigationController時，內存管理出現問題。我autorelease UINavigationController和UITableViewController，但是當我使用分配工具打開然後關閉模式視圖時，視圖創建的內存在關閉時不會釋放。

- (void)showOptions { 
    OptionsViewController *optionsViewController = [[[OptionsViewController alloc] initWithNibName:@"OptionsViewController" bundle:nil] autorelease]; 
    UINavigationController *navController = [[[UINavigationController alloc] initWithRootViewController:optionsViewController] autorelease]; 
    navController.navigationBar.tintColor = [UIColor lightGrayColor]; 
    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) { 
     navController.modalPresentationStyle = UIModalPresentationFormSheet; 
    } 
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(dismissOptions) name:@"dismissOptions" object:nil]; 
    [[(ApplicationDelegate *)[[UIApplication sharedApplication] delegate] viewController] presentModalViewController:navController animated:YES]; 
} 

- (void)dismissOptions { 
    [[NSNotificationCenter defaultCenter] removeObserver:self name:@"dismissOptions" object:nil]; 
    [[(ApplicationDelegate *)[[UIApplication sharedApplication] delegate] viewController] dismissModalViewControllerAnimated:YES]; 
} 

謝謝你的時間。

Answer 1

首先，何時/何處發佈「dismissOptions」通知？它是否發佈？在你的代碼中是否有自我指向活着？它是否收到通知？也許最重要的是，這個通知解決了什麼問題？

模態視圖控制器被自動保持，這樣所以代碼應該足夠了：

- (void)showOptions { 
    OptionsViewController *optionsViewController = [[OptionsViewController alloc] initWithNibName:@"OptionsViewController" bundle:nil]; 
    UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:optionsViewController]; 
    [self presentModalViewController:navController animated:YES]; 
    [optionsViewController release]; 
    [navController release]; 
} 

，然後在OptionsViewController，或可能關閉該模態的視圖的任何其它視圖控制器：

[self dismissModalViewControllerAnimated:YES]; 

（請注意，在這裏使用自己的足夠，作爲一個調用dismissModalViewControllerAnimated泡沫到最初呈現模態視圖控制器的視圖控制器）