釋放分配的對象（方法保留+1保留計數的object-c對象）

Question

當我對項目進行任何布局時，都會出現很多潛在的對象泄漏。當我嘗試釋放該對象時，我會收到錯誤消息：“某些對象發送到已釋放的實例”

我不明白在哪里完美地釋放對象。 我需要支持ios 4.3以上的版本。通過Google進行搜索，發現從ios 5啟用了ARC。

  - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

   [[UIApplication sharedApplication] registerForRemoteNotificationTypes:
         (UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeSound | UIRemoteNotificationTypeAlert)];  

    ViewController *searchController=[[ViewController alloc]initWithNibName:@"ViewController_iPad" bundle:nil];
    OptionsViewController *optionview=[[OptionsViewController alloc]initWithNibName:@"OptionsViewController~iPad" bundle:nil];
    optionview.title=@"Options";
    LogOut *logout=[[LogOut alloc]initWithNibName:@"LogOut~iPad" bundle:nil]; // method retains objective-c object with +1 retain count
    logout.title=@"Sign Out";
    self.tabBarController = [[[UITabBarController alloc] init] autorelease];
    self.tabBarController.viewControllers = [NSArray arrayWithObjects:searchController, optionview,logout, nil]; //Object leaked:object allocated and stored into logout is not referenced later in this execution path and has a retain count of +1
    [self.window addSubview:tabBarController1.view];  [self.window makeKeyAndVisible];
    CGRect  rect = [[UIScreen mainScreen] bounds];
    [self.window  setFrame:rect];   
    return YES; 
 }

當我寫

[self.tabBarController release];
[searchController release];
[optionview release]; 
[logout release];

后
[self.window setFrame:rect];
我收到Bad Excess錯誤

我不知道何時釋放對象。

Answer 1

首先，ios 4.0之后支持ARC。.根據蘋果文檔..

ARC is supported in Xcode 4.2 for OS X v10.6 and v10.7 (64-bit applications) and for iOS 4 and iOS 5. Weak references are not supported in OS X v10.6 and iOS 4.

來源： http : //developer.apple.com/library/ios/#releasenotes/ObjectiveC/RN-TransitioningToARC/Introduction/Introduction.html

這就是您的代碼的外觀。

   ViewController *searchController=[[ViewController alloc]initWithNibName:@"ViewController_iPad" bundle:nil];
    OptionsViewController *optionview=[[OptionsViewController alloc]initWithNibName:@"OptionsViewController~iPad" bundle:nil];
    optionview.title=@"Options";
    LogOut *logout=[[LogOut alloc]initWithNibName:@"LogOut~iPad" bundle:nil]; // method retains objective-c object with +1 retain count
    logout.title=@"Sign Out";
    self.tabBarController = [[[UITabBarController alloc] init] autorelease];
    self.tabBarController.viewControllers = [NSArray arrayWithObjects:searchController, optionview,logout, nil]; //Object leaked:object allocated and stored into logout is not referenced later in this execution path and has a retain count of +1
    [self.window addSubview:tabBarController1.view];  [self.window makeKeyAndVisible];
    CGRect  rect = [[UIScreen mainScreen] bounds];
    [self.window  setFrame:rect];   
    [searchController release];
    [optionview release];
    [logout release];
    return YES; 

您不需要顯式釋放選項卡欄控制器，因為您已經將其自動釋放了..您應該在dealloc中寫[tabBarController release]； 釋放與屬性關聯的ivar。

查看您所問的問題..我可以肯定地說，您不了解屬性和實例變量關系。 請為您自己找到一個很好的教程，以及有關ios的內存管理的教程。

希望這會有所幫助。

Answer 2

如果你寫

   self.tabBarController = [[[UITabBarController alloc] init] autorelease];

然后手動釋放該實例，例如[self.tabBarController release]; 然后它總是崩潰。

你也把這個寫在你的問題中

  self.tabBarController = [[[UITabBarController alloc] init] autorelease];
  self.tabBarController.viewControllers = [NSArray arrayWithObjects:searchController, optionview,logout, nil];

tabBarController是自動釋放的，然后您嘗試釋放其viewcontrollers？

嘗試這個：

       self.tabBarController = [[UITabBarController alloc] init];
      self.tabBarController.viewControllers = [NSArray arrayWithObjects:searchController, optionview,logout, nil];


       -(void)dealloc {
            //release your all objects
             [super dealloc];
        }