iphone - 为什么这个 CATransition 不起作用？

Question

我正在尝试转换 UILabel 的文本:

CATransition *animation = [CATransition animation];
animation.duration = 4;
animation.type = kCATransitionReveal;
animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];
[label.layer addAnimation:animation forKey:nil];

label.text = resultDateStr;

这很好用。但是当我将它设置为 kCATransitionFade 时，它停止工作。在 iOS 4.3 和 5.0 上测试有什么想法吗？

Answer 1

试试这个

[CATransaction begin];
CATransition *animation = [CATransition animation];
animation.type = kCATransitionFade;
animation.duration = 3.50;

[self.view addSubview:mySecondUIView]

[[self.view layer] addAnimation:animation forKey:@"Fade"];
[CATransaction commit];