[英]unrecognized selector sent to instance
我在选择通知方法时遇到问题。
在初始化中,我已经定义了:
NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
[nc addObserver:self selector:@selector(stopSyncIndicator:) name:IOS_STOP_SYNC_INDICATOR object:nil];
不过,该方法在标头和相同的实现中均已定义:
-(void)stopSyncIndicator
{
[indicator stopAnimating];
}
但是,当其他班级发布此通知时:
NSNotification *note = [NSNotification notificationWithName:IOS_STOP_SYNC_INDICATOR object:nil];
[[NSNotificationCenter defaultCenter] postNotification:note];
地狱破裂了:
[FTRecordViewController stopSyncIndicator:]: unrecognized selector sent to instance 0x8d3bc00
2013-11-18 13:47:06.994 [1835:70b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[FTRecordViewController stopSyncIndicator:]: unrecognized selector sent to instance 0x8d3bc00'
*** First throw call stack:
(
0 CoreFoundation 0x01bf75e4 __exceptionPreprocess + 180
1 libobjc.A.dylib 0x018f88b6 objc_exception_throw + 44
2 CoreFoundation 0x01c94903 -[NSObject(NSObject) doesNotRecognizeSelector:] + 275
知道这里发生了什么吗?
您的选择器带有一个:
表示它将接受一个参数,而您的实现则没有
要么
@selector(stopSyncIndicator) //no :
要么
-(void)stopSyncIndicator:(NSNotification *)notification //accept argument
会解决这个问题
您告诉观察者的选择器有一个参数:
[nc addObserver:self selector:@selector(stopSyncIndicator:) name:IOS_STOP_SYNC_INDICATOR object:nil];`<br/>
而且您的选择器没有参数:
-(void)stopSyncIndicator
要解决,或者删除:
从selector:@selector(stopSyncIndicator:)
或设置你的方法签名:
-(void)stopSyncIndicator:(NSNotification *)notification
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