选择器调用成功后，无法识别的选择器立即发送错误
这个错误让我感到困惑，但这里是：
我试图设置一个 IBAction 以在 UIButton 内部的触摸上运行。由于某种原因，它不起作用，并且没有真正给我任何 gdb 错误。它时不时地会提到一个无法识别的选择器。我检查以确保我的文件的所有者是正确的类，并且一切都在检查中，所以我再次运行它，但仍然没有任何结果。
我认为这可能是 Interface Builder 的问题，所以我在按钮上使用了 addTarget: ，将目标设置为 self，选择器设置为我要调用的方法的选择器，但仍然出现无法识别的选择器错误。为了测试选择器是否存在，我在我想要的方法的选择器上运行了 [self PerformSelector:]，并且它起作用了。所以基本上现在我有这个：
- (void)viewDidLoad {
[super viewDidLoad];
[self performSelector:@selector(hi)];
[_backButton addTarget:self action:@selector(hi) forControlEvents:UIControlEventTouchUpInside];
}
- (void)hi {
NSLog(@"HI");
}
执行选择器工作完美，并记录“HI”。这是关键之处，当我触摸 _backButton 时，它给了我一个无法识别的选择器错误，即使我刚刚调用它并且它起作用了：
2011-10-22 19:54:40.824 VideoGif[396:707] -[NSKeyValueObservance hi]: unrecognized selector sent to instance 0x590690
2011-10-22 19:54:40.831 VideoGif[396:707] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSKeyValueObservance hi]: unrecognized selector sent to instance 0x590690'
我已经拍摄了笔尖和实现文件的屏幕截图，可以在此处查看： https://i.sstatic.net/D9GsW.jpg
有人知道发生了什么事吗？
This bug is befuddling to me, but here goes:
I was trying to set up an IBAction to run on touch up inside on a UIButton. For some reason, it wasn't working, and wasn't really giving me any gdb errors. Every now and then it would mention an unrecognized selector. I checked to make sure my File's owner was the correct class, and everything was in check and it was, so I ran it again and still nothing.
I figured it might be a problem with Interface Builder, so I used addTarget: on the button, setting the target as self, and the selector the selector of the method I wanted to call, and still got an unrecognized selector error. To test that the selector did exist, I ran a [self performSelector:] on the selector of the method I wanted, and it worked. So basically right now I have this:
- (void)viewDidLoad {
[super viewDidLoad];
[self performSelector:@selector(hi)];
[_backButton addTarget:self action:@selector(hi) forControlEvents:UIControlEventTouchUpInside];
}
- (void)hi {
NSLog(@"HI");
}
The perform selector works perfectly, and logs "HI". Here's the kicker, when I touchup on _backButton, it gives me an unrecognized selector error, even though I just called it and it worked:
2011-10-22 19:54:40.824 VideoGif[396:707] -[NSKeyValueObservance hi]: unrecognized selector sent to instance 0x590690
2011-10-22 19:54:40.831 VideoGif[396:707] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSKeyValueObservance hi]: unrecognized selector sent to instance 0x590690'
I've taken screen shots of the nib and the implementation file, viewable here: https://i.sstatic.net/D9GsW.jpg
Does anyone know what's going on?
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问题的发生可能是因为您的 CaptionEditorViewController 实例由于某种原因被释放，正如随机类抛出“无法识别的选择器”异常所指出的那样
The problem is probably happening because your instance of CaptionEditorViewController is being deallocated for some reason, as pointed by random classes throwing "unrecognized selector" exceptions