UIButton调用选择器崩溃了应用程序

Question

在我的应用程序中,我有一个按钮,它是已经在.h文件中声明的实例变量.现在,在为它分配目标并实际按下按钮之后,应用程序崩溃,在调试器中给出了以下输出:

-[__NSCFString handleActionSheet:]: unrecognized selector sent to instance 0x9090330
2012-05-04 17:51:02.646 financeAppV2[2595:f803] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFString handleActionSheet:]: unrecognized selector sent to instance 0x9090330'
*** First throw call stack:
(0x13d1022 0x1562cd6 0x13d2cbd 0x1337ed0 0x1337cb2 0x13d2e99 0x1e14e 0x1e0e6 0xc4ade 0xc4fa7 0xc3d8a 0x2dfa1a 0x13a599e 0x133c640 0x13084c6 0x1307d84 0x1307c9b 0x12ba7d8 0x12ba88a 0x1b626 0x29dd 0x2945)
terminate called throwing an exceptionCurrent language:  auto; currently objective-c

我的代码如下所示:

saveButton=[UIButton buttonWithType:UIButtonTypeCustom];
[saveButton setBackgroundImage:[UIImage imageNamed:@"intervalbutton"] forState:UIControlStateNormal];
[saveButton setBackgroundImage:[UIImage imageNamed:@"intervalbuttonpressed"] forState:UIControlStateHighlighted];
saveButton.alpha=.8;
saveButton.frame= frame;
UILabel* label=[[UILabel alloc]initWithFrame:CGRectMake(0, 2, saveButton.frame.size.width, 21)];
[saveButton addSubview:label];

[saveButton addTarget:self action:@selector(handleActionSheet:) forControlEvents:UIControlEventTouchDown];

[self.view addSubview:saveButton];


-(void)handleActionSheet:(id)sender{
NSLog(@"working");

}

任何想法为什么应用程序崩溃？

Answer 1

如果没有看到代码的其余部分,则很难具体,但却self没有正确保留.

您正确设置了按钮(据我所知)并将目标指向self.不幸的是,当你按下按钮self超出范围并且使用相同的内存时NSString.当您发送字符串handleActionSheet:消息时,iOS会感到惊讶.