objective-c - 用数字动画 UILabel

Question

我仍在学习 UIAnimations，刚刚接触它，我偶然发现了一个我不确定如何解决的问题。我见过你获得新高分的游戏，它将新高分加到旧高分上，它们使数字向上或向下动画。它看起来很酷，视觉上也很舒服。

谁能给我解释一下这是怎么做到的？如果这个问题很容易解决，我深表歉意，就像我说的，我仍在努力学习/完善动画。

提前致谢

Answer 1

我从 post sergio suggested you look at 中获取了代码，但注意到 Anshu 提到你想要一个上下移动的动画而不是淡入/淡出动画，所以我更改了代码以适应你想要的。给你:

// Add transition (must be called after myLabel has been displayed)
CATransition *animation = [CATransition animation];
animation.duration = 1.0;   //You can change this to any other duration
animation.type = kCATransitionMoveIn;     //I would assume this is what you want because you want to "animate up or down"
animation.subtype = kCATransitionFromTop; //You can change this to kCATransitionFromBottom, kCATransitionFromLeft, or kCATransitionFromRight
animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
[myLabel.layer addAnimation:animation forKey:@"changeTextTransition"];

// Change the text
myLabel.text = newText;

希望这对您有所帮助!