ios開發@selector的函數如何傳參數/如何傳遞多個參數

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不同的類會有不同的傳遞方式,參數名也不盡相同。如果是傳單個參數的就不用集合,如果是傳多個參數可以用類似nsarray,nsdictionary之類的集合傳遞。看下面例子:

例子1:

通過NSTimer看IPhone對@selector的函數如何傳參數,

NSMutableDictionary *dict = [[NSMutableDictionary alloc] init];      if(oldView != nil)    {        [dict setObject:oldView forKey:@"oldView"];     }    if(newView != nil)    {        [dict setObject:newView forKey:@"newView"];     }     [NSTimer scheduledTimerWithTimeInterval:0.0 target:self selector:@selector(onTimer:) userInfo:dict repeats:NO];      [dict release];  - (void)onTimer:(NSTimer *)timer {      UIView *oldView = [[timer userInfo] objectForKey:@"oldView"];    UIView *newView = [[timer userInfo] objectForKey:@"newView"];      [UIView animateWithDuration:2.0  delay:0                        options:UIViewAnimationOptionAllowUserInteraction                     animations:^{                           oldView.alpha = 0.0;                          newView.alpha = 1.0;                       }  } 

 

 

從上可以看出,NSTimer在對@selector(onTimer:)傳遞參數時,將傳參的對象儲存在了NSTimer的userInfo的字典裡,在- (void)onTimer:(NSTimer *)timer中

通過取出該字典加以使用。

例子2:

-(void)addNotifications:(NSArray*)data{    if (data==nil||data.count!=2) {        return;    }    //nsstring字串轉nsinteger    NSInteger notifyNum=[(NSString*)data[0] intValue];    NSInteger index=[data[1] intValue];    MyNBTabButton *button=_buttonData[index];    [button.light addNotifications:notifyNum];    }

//調用

-(void)addNotificationAfterTime

{

     [NSThread sleepForTimeInterval:20];//休眠多少秒之後

        [self performSelectorOnMainThread:@selector(addNotifications:) withObject:[NSArray arrayWithObjects:@"1",@"2", nil] waitUntilDone:NO];

        [NSThread sleepForTimeInterval:1.0];

    

}

  

這個其實也就是iphone對@selector對象傳參的通用的形式。

轉載請註明:http://www.cnblogs.com/langtianya/p/4199409.html

ios開發@selector的函數如何傳參數/如何傳遞多個參數

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