Question

我有一个奇怪的错误，我以编程方式创建了一个UIBarButtonItem，当它连接到Xcode时，它在模拟器和设备上工作正常。但每当我拔下设备时，应用程序会在我触摸按钮时崩溃。

以下是我创建按钮的方法，并将其分配给导航栏：

self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCancel target:self action:@selector(backToMainPage:)];

方法：

- (void)backToMainPage:(id)sender
{
     NSLog(@"...");
}

这是我得到的错误：

Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x40290020
Crashed Thread:  0
Thread 0 name:  Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0   libobjc.A.dylib                 0x3693d386 _ZL12realizeClassP7class_t + 34
1   libobjc.A.dylib                 0x3693d3e6 _ZL12realizeClassP7class_t + 130
2   libobjc.A.dylib                 0x36937836 prepareForMethodLookup + 74
3   libobjc.A.dylib                 0x36937740 lookUpMethod + 40
4   libobjc.A.dylib                 0x3693770c _class_lookupMethodAndLoadCache3 + 12
5   libobjc.A.dylib                 0x36936fc4 objc_msgSend_uncached + 20
6   UIKit                           0x30f28fa8 -[UIApplication sendAction:to:from:forEvent:] + 56
7   UIKit                           0x30f28f64 -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 24
8   UIKit                           0x30f28f42 -[UIControl sendAction:to:forEvent:] + 38
9   UIKit                           0x30f28cb2 -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 486
10  UIKit                           0x30f295ea -[UIControl touchesEnded:withEvent:] + 470
11  UIKit                           0x30f27acc -[UIWindow _sendTouchesForEvent:] + 312
12  UIKit                           0x30f274ba -[UIWindow sendEvent:] + 374
13  UIKit                           0x30f0d836 -[UIApplication sendEvent:] + 350
14  UIKit                           0x30f0d0dc _UIApplicationHandleEvent + 5820
15  GraphicsServices                0x33f30224 PurpleEventCallback + 876
16  CoreFoundation                  0x3494251c __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 32
17  CoreFoundation                  0x349424be __CFRunLoopDoSource1 + 134
18  CoreFoundation                  0x3494130c __CFRunLoopRun + 1364
19  CoreFoundation                  0x348c449e CFRunLoopRunSpecific + 294
20  CoreFoundation                  0x348c4366 CFRunLoopRunInMode + 98
21  GraphicsServices                0x33f2f432 GSEventRunModal + 130
22  UIKit                           0x30f3be76 UIApplicationMain + 1074

任何人都可以帮助我做错了吗？

提前致谢！

Answer 1

试试这个

UIBarButtonItem *barButton = [[[UIBarButtonItem alloc]initWithImage:infoButton.currentImage style:UIBarButtonItemStyleBordered target:self action:@selector(showInfo:)] autorelease];

[self.navigationItem setLeftBarButtonItem:barButton];

谢谢：）

Answer 2

我认为viewcontroller会被释放。您能否显示此viewcotroller的创建位置以及其视图在屏幕上的显示方式。

没有垃圾收集。不同之处可能是在调试设置中，对象会无限期地保留以便更好地记录

UIBarButtonItem奇怪的错误

2 个答案: