界面生成器创建的UIButton正在崩溃

我已经缩小了一个丑陋的bug的范围,但是由于它看起来像是nib/接口生成器内部的东西,我不知道下一步该怎么做。

我在IB中创建了一个UIView,它可以作为一个自定义对话框。它显示一条消息和两个按钮。(继续或取消。)两个按钮都在Interface Builder中设置了背景图像。

-[ModalDialog showInView:title:message:cancelText:proceedText:]
dialogProceedButton <UIButton: 0x7031f10; frame = (286 192; 90 31) // (etc.)
dialogProceedButtonBackground <UIImage: 0x3b36120>
dialogCancelButton <UIButton: 0x3b39cd0; frame = (104 192; 90 31) // (etc.)
dialogCancelButtonBackground <UIImage: 0x3b3a920>

这完全正常。但是,有时它会这样做(如果我通过快速点击一些界面按钮来“快速启动”UI,我可以在某种程度上可靠地重复这一点):

-[ModalDialog showInView:title:message:cancelText:proceedText:]
dialogProceedButton <UIButton: 0x7031f10; frame = (286 192; 90 31) // (etc.)
dialogProceedButtonBackground <UIImage: 0x3b36120>
dialogCancelButton <UIButton: 0x3b39cd0; frame = (104 192; 90 31) // (etc.)
*** -[UIImage retain]: message sent to deallocated instance 0x3b3a920

只有 用于此一个按钮,以及 只有 在界面生成器中访问。我没有任何IBOutlets或任何变量链接到该图像。)

那现在呢?

编辑:

有时,它不是一条被当作僵尸捕获的保留消息,有时它是一种类别:

//(the object address is always dialogCancelButton.currentBackgroundImage)
-[UIImage isKindOfClass:]: message sent to deallocated instance 0x1661f0
//occasionally, these come along, too:
*** NSInvocation: warning: object 0x7e0d0b0 of class '_NSZombie_UIImage' does not implement methodSignatureForSelector: -- trouble ahead
*** NSInvocation: warning: object 0x7e0d0b0 of class '_NSZombie_UIImage' does not implement doesNotRecognizeSelector: -- abort

- (void)showInView:superView 
             title:(NSString*)title 
             message:(NSString*)message 
             cancelText:(NSString*)cancelText 
             proceedText:(NSString*)proceedText {

NSLog(@"%s",__PRETTY_FUNCTION__);
NSLog(@"dialogProceedButton %@", dialogProceedButton);
NSLog(@"dialogProceedButtonBackground %@", dialogProceedButton.currentBackgroundImage);
NSLog(@"dialogCancelButton %@", dialogCancelButton);
NSLog(@"dialogCancelButtonBackground %@", dialogCancelButton.currentBackgroundImage);



CGRect rect;
dialogTitle.text = title;
dialogMessage.text = message;
[dialogProceedButton setTitle:proceedText forState:UIControlStateNormal];

if (cancelText == @"") { // SINGLE BUTTON DIALOG
  dialogCancelButton.hidden = YES;
  rect = [dialogProceedButton frame];
  rect.origin.x = 195; //center the button 
  [dialogProceedButton setFrame:rect];
} else {
  [dialogCancelButton setTitle:cancelText forState:UIControlStateNormal];
  dialogCancelButton.hidden = NO;
  rect = [dialogProceedButton frame];
  rect.origin.x = 286; //button on right of dialog box 
  [dialogProceedButton setFrame:rect];
}

[UIView beginAnimations:@"modalAppears" context:nil];
[UIView setAnimationDuration:0.5];
[superView addSubview:self];
self.alpha = 1.0;
[UIView commitAnimations];
}

谢谢