IOS 關於取消順延強制函數的種種。performSelector與cancelPreviousPerformRequestsWithTarget

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http://blog.csdn.net/samuelltk/article/details/8994313

 

 [置頂] IOS 關於取消順延強制函數的種種。performSelector與cancelPreviousPerformRequestsWithTarget分類： IOS2013-05-30 13:53 9722人閱讀 評論(0) 收藏 舉報 [cpp] view plaincopy

1. @interface NSObject (NSDelayedPerforming)  
2.   
3. - (void)performSelector:(SEL)aSelector withObject:(id)anArgument afterDelay:(NSTimeInterval)delay inModes:(NSArray *)modes;  
4. - (void)performSelector:(SEL)aSelector withObject:(id)anArgument afterDelay:(NSTimeInterval)delay;  
5. + (void)cancelPreviousPerformRequestsWithTarget:(id)aTarget selector:(SEL)aSelector object:(id)anArgument;  
6. + (void)cancelPreviousPerformRequestsWithTarget:(id)aTarget;  
7.   
8. @end  

 

最近看到大家對cancelPreviousPerformRequestsWithTarget不能取消帶參數的
- (void)performSelector:(SEL)aSelector withObject:(id)anArgument afterDelay:(NSTimeInterval)delay;
情況，寫了一點點代碼調試了一下，發現如果是帶參數，那取消時的參數也要一致，否則不能取消成功。
開始順延強制：

 

[cpp] view plaincopy

1. [self performSelector:@selector(didRuninCurrModel:) withObject:[NSNumber numberWithBool:YES] afterDelay:3.0f];  
2.   
3. [self performSelector:@selector(didRuninCurrModelNoArgument) withObject:nil afterDelay:3.0f];  

假如在三秒內執行以下取消方法，則結果分別為：

 

 

[cpp] view plaincopy

1. [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(didRuninCurrModel:) object:[NSNumber numberWithBool:YES]];//可以取消成功。  
2.   
3. [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(didRuninCurrModel:) object:[NSNumber numberWithBool:NO]];//不能取消成功。參數不匹配  
4.   
5. [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(didRuninCurrModel:) object:nil];//不能取消成功。參數不匹配  
6.   
7. [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(didRuninCurrModelNoArgument) object:nil];//可以成功取消  
8.   
9. [NSObject cancelPreviousPerformRequestsWithTarget:self];//可以成功取消全部。  
10. [[self class] cancelPreviousPerformRequestsWithTarget:self];//可以成功取消全部。  

代碼：http://download.csdn.net/detail/samuelltk/5481327

IOS 關於取消順延強制函數的種種。performSelector與cancelPreviousPerformRequestsWithTarget