【IOS开发】presentModalViewControllerAnimated 和 dismissModalViewControllerAnimated

使用presentModalViewControllerAnimated方法从A->B->C，若想在C中直接返回A，则可这样实现：

C中返回事件：

-(void) back   {      

    [self dismissModalViewControllerAnimated:NO];//注意一定是NO！！      

   [[NSNotificationCenter  defaultCenter]postNotificationName:@"backback" object:nil];  

 } 

然后在B中，

//在viewdidload中：  

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(back) name:@"backback" object:nil];      

-(void)back  

 {      

      [self dismissModalViewControllerAnimated:YES];  

 }