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

[cpp] view plain copy @interface NSObject (NSDelayedPerforming)      - (void)performSelector:(SEL)aSelector withObject:(id)anArgument afterDelay:(NSTimeInterval)delay inModes:(NSArray *)modes;   - (void)performSelector:(SEL)aSelector withObject:(id)anArgument afterDelay:(NSTimeInterval)delay;   + (void)cancelPreviousPerformRequestsWithTarget:(id)aTarget selector:(SEL)aSelector object:(id)anArgument;   + (void)cancelPreviousPerformRequestsWithTarget:(id)aTarget;      @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 plain copy [self performSelector:@selector(didRuninCurrModel:) withObject:[NSNumber numberWithBool:YES] afterDelay:3.0f];      [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 plain copy [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(didRuninCurrModel:) object:[NSNumber numberWithBool:YES]];//可以取消成功。      [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(didRuninCurrModel:) object:[NSNumber numberWithBool:NO]];//不能取消成功。參數不匹配      [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(didRuninCurrModel:) object:nil];//不能取消成功。參數不匹配      [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(didRuninCurrModelNoArgument) object:nil];//可以成功取消      [NSObject cancelPreviousPerformRequestsWithTarget:self];//可以成功取消全部。   [[self class] cancelPreviousPerformRequestsWithTarget:self];//可以成功取消全部。  
代碼下載地址：http://download.csdn.net/detail/samuelltk/5481327