UIActionSheet cancel按钮不响应的问题

当APP中使用到tabbar，会出现部分按钮无法响应的问题。在xcode的控制台中也会报出相应的错误，提示使用从tabbar加载的信息。

解决方法如下：

UIActionSheet *removeActionSheet=[[UIActionSheet alloc]initWithTitle:titleforActionSheet delegate:selfcancelButtonTitle:@"Cancel" destructiveButtonTitle:@"Ok" otherButtonTitles:nil, nil];

removeActionSheet.actionSheetStyle=UIActionSheetStyleDefault;
[removeActionSheet showInView:[UIApplication sharedApplication].keyWindow];

将原来showinView:self.view改为[[UIApplication sharedApplication].keyWindow]