iOS按钮在动画期间无法点击

Question

当我使用类别方法向我的按钮添加动画时,我无法单击该按钮,似乎它被禁用:

[_compassCalibrateButton pulse:1.5 continuously:YES];
_compassCalibrateButton.userInteractionEnabled=YES;

我有一个UIView类别包含这个:

- (void)pulse:(float)secs continuously:(BOOL)continuously {
    [UIView animateWithDuration:secs/2 
                          delay:0.0 
                        options:UIViewAnimationOptionCurveLinear
                     animations:^{
                         // Fade out, but not completely
                         self.alpha = 0.3;
                     }
                     completion:^(BOOL finished) { 
                         [UIView animateWithDuration:secs/2 
                                               delay:0.0 
                                             options:UIViewAnimationOptionCurveLinear
                                          animations:^{
                                              // Fade in
                                              self.alpha = 1.0;
                                          }
                                          completion:^(BOOL finished) { 
                                              if (continuously) {
                                                  [self pulse:secs continuously:continuously];
                                              }
                                          }];
                     }];
}

Answer 1

来自doc

在动画期间,对于要动画的视图,临时禁用用户交互.(在iOS 5之前,对整个应用程序禁用用户交互.)如果希望用户能够与视图交互,请在options参数中包含UIViewAnimationOptionAllowUserInteraction常量.

所以你的代码应该是

- (void)pulse:(float)secs continuously:(BOOL)continuously {
    [UIView animateWithDuration:secs/2 
                          delay:0.0 
                        options:UIViewAnimationOptionCurveLinear | UIViewAnimationOptionAllowUserInteraction
                     animations:^{
                         // Fade out, but not completely
                         self.alpha = 0.3;
                     }
                     completion:^(BOOL finished) { 
                         [UIView animateWithDuration:secs/2 
                                               delay:0.0 
                                             options:UIViewAnimationOptionCurveLinear | UIViewAnimationOptionAllowUserInteraction
                                          animations:^{
                                              // Fade in
                                              self.alpha = 1.0;
                                          }
                                          completion:^(BOOL finished) { 
                                              if (continuously) {
                                                  [self pulse:secs continuously:continuously];
                                              }
                                          }];
                     }];

}

Answer 2

我在 Swift 4 上测试过

 UIView.animate(withDuration: 0.8, delay: 0, options: [.repeat, .autoreverse, .allowUserInteraction], animations: {
        // Do Something
    }, completion: nil)