iOS UIButton按钮颜色渐变动画

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   self.rotateButton.imageView.alpha = 0.2;     [UIView animateWithDuration:0.2                     animations:^{                         self.rotateButton.imageView.alpha = 0.5;                     }completion:^(BOOL finish){                         [UIView animateWithDuration:0.2                                          animations:^{                                              self.rotateButton.imageView.alpha = 0.7;                                          }completion:^(BOOL finish){                                              self.rotateButton.imageView.alpha = 1.0;                                          }];                     }];}

    [UIView animateWithDuration: 0.15 delay: 0 options: UIViewAnimationOptionCurveEaseInOut animations: ^{        [self rotateLocation:pLocation];        self.rotateButton.imageView.alpha = 0.5;    } completion: ^(BOOL finished) {        [UIView animateWithDuration: 0.15 animations: ^{            self.rotateButton.imageView.alpha = 1.0;        }];    }];

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