iPhone - 使用类属性时释放崩溃

发布于 2024-10-23 01:05:20 字数 529 浏览 4 评论 0原文

简单的问题...

为什么当我单击overlayController 视图上的按钮时，这个release 会使我的应用程序崩溃？

    OverlayViewController* overlayController = [[OverlayViewController alloc]
                                                initWithNibName:@"Overlay"
                                                         bundle:nil];
    self.picker.cameraOverlayView = overlayController.view;
    [overlayController release];

换句话说，如何在 viewDidLoad 方法之外调用 OverlayViewController 方法？

奇怪...我不明白为什么我的应用程序可以工作:-)

原文

Simple question...

Why does this release crash my app when I click on a button that is on the overlayController view?

    OverlayViewController* overlayController = [[OverlayViewController alloc]
                                                initWithNibName:@"Overlay"
                                                         bundle:nil];
    self.picker.cameraOverlayView = overlayController.view;
    [overlayController release];

Said another way, how can the OverlayViewController methods be called outside of this viewDidLoad method?

Strange... I do not understand why my app is working :-)

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把昨日还给我 2024-10-30 01:05:20

好吧，我可以很容易地回答第二个问题：

如何在此 viewDidLoad 方法之外调用 OverlayViewController 方法？

只需将一个属性添加到您的 viewController 中：

MyViewController.h：

@interface MyViewController : UIViewController {
    OverlayViewController* overlayController;
}
@property (nonatomic, retain) OverlayViewController* overlayController;
@end

MyViewController.m：

@implementation MyViewController
@synthesize overlayController;

- (void)viewDidLoad {
    OverlayViewController* ovc = [[OverlayViewController alloc]
                                   initWithNibName:@"Overlay" bundle:nil];
    self.overlayController = ovc;
    [ovc release];
    self.picker.cameraOverlayView = self.overlayController.view;
}

- (void)someOtherMethod {
    [self.overlayController someMethod];
}

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

@end

Well, I can answer the second question easily enough:

How can the OverlayViewController methods be called outside of this viewDidLoad method?

Simply add a property to your viewController:

MyViewController.h:

@interface MyViewController : UIViewController {
    OverlayViewController* overlayController;
}
@property (nonatomic, retain) OverlayViewController* overlayController;
@end

MyViewController.m:

@implementation MyViewController
@synthesize overlayController;

- (void)viewDidLoad {
    OverlayViewController* ovc = [[OverlayViewController alloc]
                                   initWithNibName:@"Overlay" bundle:nil];
    self.overlayController = ovc;
    [ovc release];
    self.picker.cameraOverlayView = self.overlayController.view;
}

- (void)someOtherMethod {
    [self.overlayController someMethod];
}

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

@end

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初相遇 2024-10-30 01:05:20

set方法不保留视图吗
属性

是的，但它不保留 overlayController ，它会在 [overlayController release] 后愉快地释放。

为了能够调用overlayController方法，请将其保存在实例变量中。无论如何你都必须这样做以避免崩溃和/或泄漏。

回复收藏 0 原文

定格我的天空 2024-10-30 01:05:20

您将overlayController 的视图分配给您的属性，但随后释放整个控制器。时，setter 才会保留。

@property(retain)NSArray * myArray;

仅当您指定了此设置（如查看cameraOverlayView 的属性，如果这确实保留了视图）

You're assigning the view of the overlayController to your property but release the whole controller afterwards. The setter does only retain if you've specified this like