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前几天被这个问题搞得头昏，转不过来弯。突然想起可以定义两个按钮放在同一个位置。点击一次就添加另一个按钮.

- (void) handleBtn1: (id) sender {

 
  NSLog(@"现在是按钮2事件");

 
  UIButton
*btn = [UIButton
buttonWithType:UIButtonTypeCustom];

 
  [btn setTitle:@"按钮1"
forState:UIControlStateNormal];

 
  [btn addTarget:self action:@selector(handleBtn2:) forControlEvents:UIControlEventTouchUpInside];

 
  btn.frame
= CGRectMake(0, 0, 40, 20);

 
  self.navigationItem.rightBarButtonItem
= [[UIBarButtonItem
alloc]initWithCustomView:btn];

}

- (void) handleBtn2: (id) sender {

   NSLog(@"现在是按钮1事件");

 
  UIButton
*btn = [UIButton
buttonWithType:UIButtonTypeCustom];

 
  [btn setTitle:@"按钮2"
forState:UIControlStateNormal];

 
  [btn addTarget:self action:@selector(handleBtn1:) forControlEvents:UIControlEventTouchUpInside];

 
  btn.frame
= CGRectMake(0, 0, 40, 20);

  
 

 
  self.navigationItem.rightBarButtonItem
= [[UIBarButtonItem
alloc]initWithCustomView:btn];

}

- (void) viewDidLoad {

 
  UIButton
*btn = [UIButton
buttonWithType:UIButtonTypeCustom];

 
  [btn setTitle:@"淡出"
forState:UIControlStateNormal];

 
  [btn addTarget:self action:@selector(handleBtn1:) forControlEvents:UIControlEventTouchUpInside];

 
  btn.frame
= CGRectMake(0, 0, 40, 20);

 
  self.navigationItem.rightBarButtonItem
= [[UIBarButtonItem
alloc]initWithCustomView:btn];

}