您不需要多个标签.您可以使用单个标签进行动画制作：
– 利用内置的CALayer动画和UIView扩展
– 在故事板中,将UILabel放在UIView中,并带有Clip Subviews标志(脚注).
– pushTransition适用于大多数UIView

扩展

// Usage: insert view.pushTransition right before changing content
extension UIView {
    func pushTransition(_ duration:CFTimeInterval) {
        let animation:CATransition = CATransition()
        animation.timingFunction = CAMediaTimingFunction(name:
            kCAMediaTimingFunctionEaseInEaSEOut)
        animation.type = kCATransitionPush
        animation.subtype = kCATransitionFromTop
        animation.duration = duration
        layer.add(animation,forKey: kCATransitionPush)
    }
}

Swift 2及更早版本(请参阅Steve Baughman的评论)：使用self.layer.addAnimation(animation,forKey：kCATransitionPush)

pushTransition调用

if let aLabel = label {
    aLabel.pushTransition(0.4)
    aLabel.text = "\(count)"
    count += 1
}

3.在行动

您甚至可以控制曲线,持续时间和方向†.

(†)剪切是预期效果的重要步骤.

►在GitHub查找此解决方案,并在Swift Recipes上查看更多详细信息.