@selector的函数如何传参数/如何传递多个参数

不同的类会有不同的传递方式,参数名也不尽相同。如果是传单个参数的就不用集合,如果是传多个参数可以用类似nsarray,nsdictionary之类的集合传递。看下面例子:

例子1:

通过NSTimer看IPhone对@selector的函数如何传参数,

复制代码
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;  

                     }  

} 
复制代码

 

 

从上可以看出,NSTimer在对@selector(onTimer:)传递参数时,将传参的对象储存在了NSTimer的userInfo的字典里,在- (void)onTimer:(NSTimer *)timer中

通过取出该字典加以使用。

例子2:

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

-(void)addNotificationAfterTime

{

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

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

        [NSThread sleepForTimeInterval:1.0];

    

}

  

这个其实也就是iphone对@selector对象传参的通用的形式。

转载请注明:http://www.cnblogs.com/langtianya/p/4199409.html

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转载自blog.csdn.net/u011862058/article/details/51851087
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