iphone - 分配的对象的潜在泄漏 - UIViewController

Question

我的应用程序是基于 View 的应用程序。我有 3 个 View Controller 。 (主要、次要、细节)每个 View Controller 都有一个 UIView。在 MainViewcontroller 中，有一个启动 subview 的按钮。方法如下。

-(IBAction) LaunchSubView: (id)sender {

subViewcontroller *viewController = [[subViewcontroller alloc] init];

UIView *currentView = self.view;
[UIView transitionFromView:currentView 
                    toView:viewController.view 
                  duration:0.5 
                   options:UIViewAnimationOptionTransitionFlipFromLeft   
                completion:^(BOOL finished){}];

}

当我尝试构建和分析时，我收到了此警告。第 54 行分配并存储到“viewController”中的对象存在潜在泄漏我在transitionFromView方法和subViewcontroller *viewController = [[[subViewcontroller alloc] init] autorelease]之后尝试了[viewController release]；这两种方式都会导致应用程序崩溃。知道我该怎么办吗？预先感谢您的任何帮助。 =)

Answer 1

transitionFromView:toView:duration:options:completion: 不是正确的使用方法。您可能应该使用 presentModalViewController:animated:。

如果您阅读了 transitionFromView:toView:duration:options:completion: 的文档，它会解释:

This method modifies the views in their view hierarchy only. It does not modify your application’s view controllers in any way. For example, if you use this method to change the root view displayed by a view controller, it is your responsibility to update the view controller appropriately to handle the change."