ios - UIButton 随动画显示和消失

Question

我想创建一个只显示 5 秒然后消失的按钮。用户必须在按钮消失之前单击它。所以我使用 animationWithDuration 将 alpha 设置为 1，然后将其设置回 0。这是我的代码...

  __block UIButton *showButton = [[UIButton alloc]initWithFrame:CGRectMake(0, 0, 150, 40)];

[showButton setTitle:@"go to next page！" forState:UIControlStateNormal];
showButton.alpha = 0;
[showButton addTarget:self action:@selector(showButtonClick) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:showButton];

[UIView animateWithDuration:1
                      delay:0
                    options: UIViewAnimationOptionCurveEaseInOut
                 animations:^{
                     showButton.alpha = 1.0;
                 }
                 completion:nil];

[UIView animateWithDuration:0.5
                      delay:3.0
                    options: UIViewAnimationOptionCurveEaseInOut|UIViewAnimationOptionAllowUserInteraction
                 animations:^{
                     showButton.alpha = 0.0;
                 } 
                 completion:^(BOOL finished){
                     [showButton removeFromSuperview];
                     showButton = nil;
                 }];

-(void)showButtonClick{
  NSLog(@"click")
}

但是无法调用 showButtonClick。我做错了什么？

Answer 1

试试这个代码:

UIButton *showButton = [[UIButton alloc]initWithFrame:CGRectMake(0, 0, 150, 40)];

[showButton setTitle:@"go to next page！" forState:UIControlStateNormal];
showButton.alpha = 0;
[showButton addTarget:self action:@selector(showButtonClick) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:showButton];


[UIView animateWithDuration:1
                      delay:0
                    options: UIViewAnimationOptionCurveEaseInOut
                 animations:^{
                     [showButton setHidden:NO];
                     showButton.alpha = 1.0;
                 }
                 completion: {

                     [UIView animateWithDuration:0.5
                                           delay:0
                                         options: UIViewAnimationOptionCurveEaseInOut|UIViewAnimationOptionAllowUserInteraction
                                      animations:^{
                                       showButton.alpha = 0.0;
                                      } 
                                      completion:^(BOOL finished){
                                       [showButton setHidden:YES];
                     }];
}];



-(void)showButtonClick{
  NSLog(@"click")
}