iphone - iOS insertSubview :belowSubview: crashing with SIGABRT

Question

我有一个自定义 TabbarViewController这基本上隐藏了标准选项卡 View 。我附加了一个按钮，当按下该按钮时，会在屏幕上显示一个菜单。长时间使用该应用程序时一切正常，但在某些时候它会崩溃并出现 EXC_BAD_ACCESS或 SIGABRT .

奇怪的是当我添加了 NSLog打印 tabbarController和 menuView在检查 menuView 是否是 tabbarController 的 subview 之前，它在 NSLog 上崩溃了行(在我看来，其中一个已被释放，但没有明确调用，它们都被保留)。

这种崩溃从未在模拟器上发生过。关于有什么问题的任何想法？

AppDelegate.h

UIButton *ribbon;
RibbonMenu* menu;
@property (nonatomic, retain) CustomTabbarController* tabbarController;
@property (nonatomic, retain) UIView* menuView;

AppDelegate.m

@synthesize tabbarController;
@synthesize menuView;

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
tabbarController = [[CustomTabbarController alloc] init];
    [tabbarController setTabBarHidden:YES animated:NO];
    tabbarController.viewControllers = [NSArray arrayWithObjects: EventsNavigation, StyleNavigation, BrandNavigation, MemberNavigation, settingsNavigation, nil];

    ribbon = [UIButton buttonWithType:UIButtonTypeCustom];
    [ribbon retain];
    UIImage* img = [UIImage imageNamed:@"toppart.png"];
    [ribbon setImage:img forState:UIControlStateNormal];
    ribbon.frame = CGRectMake(234,0,86,97);    
    //MENU SELECTOR
    [ribbon addTarget:self action:@selector(didClickMenu) forControlEvents:UIControlEventTouchUpInside];
    [tabbarController.view addSubview:ribbon];

    self.window.rootViewController = tabbarController;    
    [self.window makeKeyAndVisible];
}


- (void) didClickMenu {
    if (!menuView) {
        menu = [[RibbonMenu alloc] init];
        menuView = menu.view;
        menuView.backgroundColor = [UIColor clearColor];
        [blinkTimer invalidate];
        ribbon.selected = NO;
    }

    if ([tabbarController.view.subviews containsObject:menuView]) {
        [self removeMenu];
    } else {
        menuView.frame = CGRectMake(235,-370,82,432);
        //**CRASH HERE**
        [tabbarController.view insertSubview:menuView belowSubview:ribbon];
        [UIView transitionWithView:menuView
                          duration:0.2
                           options:UIViewAnimationOptionCurveLinear
                        animations:^ { menuView.frame = CGRectMake(235,0,82,432);}
                        completion:nil];
    }
}

-(void) removeMenu {
    [UIView transitionWithView:menuView
                      duration:0.2
                       options:UIViewAnimationOptionCurveLinear
                    animations:^ { menuView.frame = CGRectMake(235,-370,82,432);}
                    completion:^(BOOL finished) {[menuView removeFromSuperview];}];
}

这是崩溃日志

Exception Type:  EXC_CRASH (SIGABRT)
Exception Codes: 0x00000000, 0x00000000
Crashed Thread:  0

Last Exception Backtrace:
0   CoreFoundation                  0x35a5388f __exceptionPreprocess + 163
1   libobjc.A.dylib                 0x33677259 objc_exception_throw + 33
2   CoreFoundation                  0x35a53789 +[NSException raise:format:] + 1
3   CoreFoundation                  0x35a537ab +[NSException raise:format:] + 35
4   UIKit                           0x33313cf1 __windowForView + 157
5   UIKit                           0x33155ccd -[UIView(Hierarchy) _postMovedFromSuperview:] + 21
6   UIKit                           0x3315680d -[UIView(Internal) _addSubview:positioned:relativeTo:] + 1169
7   UIKit                           0x33172071 -[UIView(Hierarchy) insertSubview:belowSubview:] + 29
8   MyAppName                       0x000c6af3 -[AppDelegate didClickMenu] (AppDelegate.m:247)

Answer 1

这种崩溃也应该发生在模拟器上。在 didClickMenu您尝试访问 menuView。但是，从外观上看，您没有名为 menuView 的实例变量。您有一个 房产 调用 menuView，但您需要使用 self.menuView 调用此属性.

或者，如果您使用的是 Xcode 4.4 或更高版本并且您没有合成您的属性，编译器将为您创建一个实例变量。此实例变量与属性同名，但带有 _ 前缀——在本例中为 _menuView .