使用动画改变UILabel的背景色
当设置了UIView的backgroundColor，再去动画改变UILabel的背景色会失败
//设置背景色
label.backgroundColor = [UIColor redColor];
...
//动画修改背景色
CABasicAnimation* cocorAnimation = [CABasicAnimation animationWithKeyPath:@"backgroundColor"];
CGColorRef originColor = [UIColor whiteColor].CGColor;
CGColorRef darkGray = [UIColor blueColor].CGColor;
cocorAnimation.fromValue = (__bridge id)originColor;
cocorAnimation.toValue = (__bridge id)darkGray;
cocorAnimation.duration = 0.8;
[self.label.layer addAnimation:cocorAnimation forKey:@""];
效果是 UILabel的背景色一点也没改变。。
修改使用layer的backgroundColor
//设置背景色
label.layer.backgroundColor = [UIColor redColor].CGColor;
...
//动画修改背景色
CABasicAnimation* cocorAnimation = [CABasicAnimation animationWithKeyPath:@"backgroundColor"];
CGColorRef originColor = [UIColor whiteColor].CGColor;
CGColorRef darkGray = [UIColor blueColor].CGColor;
cocorAnimation.fromValue = (__bridge id)originColor;
cocorAnimation.toValue = (__bridge id)darkGray;
cocorAnimation.duration = 0.8;
[self.label.layer addAnimation:cocorAnimation forKey:@""];
这次动画成功了。