iPhone - 使用类属性时释放崩溃

Question

简单的问题...

当我点击overlayController View 上的按钮时，为什么这个版本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，如何在该 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:-)

Answer 1

嗯，我可以很容易地回答第二个问题:

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

只需向您的 viewController 添加一个属性即可:

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