是否有可能animationUILabel的textcolor更改？

UIView.animateWithDuration(5, animations: { myLabel.textColor = UIColor.redColor() }) 

标签textcolor只是立即改变

Answer 1

尝试这个

 [UIView transitionWithView:myLabel duration:0.25 options:UIViewAnimationOptionTransitionCrossDissolve animations:^{ label.textColor = [UIColor redColor]; } completion:^(BOOL finished) { }]; 

Answer 2

我写下了Objective-C和Swift的代码

animationtypes

 typedef NS_OPTIONS(NSUInteger, UIViewAnimationOptions) { UIViewAnimationOptionCurveEaseInOut = 0 << 16, // default UIViewAnimationOptionCurveEaseIn = 1 << 16, UIViewAnimationOptionCurveEaseOut = 2 << 16, UIViewAnimationOptionCurveLinear = 3 << 16, UIViewAnimationOptionTransitionNone = 0 << 20, // default UIViewAnimationOptionTransitionFlipFromLeft = 1 << 20, UIViewAnimationOptionTransitionFlipFromRight = 2 << 20, UIViewAnimationOptionTransitionCurlUp = 3 << 20, UIViewAnimationOptionTransitionCurlDown = 4 << 20, UIViewAnimationOptionTransitionCrossDissolve = 5 << 20, UIViewAnimationOptionTransitionFlipFromTop = 6 << 20, UIViewAnimationOptionTransitionFlipFromBottom = 7 << 20, } NS_ENUM_AVAILABLE_IOS(4_0); 

编码 Objective-C

 [UIView transitionWithView:myLabel duration:0.20 options: UIViewAnimationOptionTransitionFlipFromBottom animations:^{ myLabel.textColor = [UIColor redColor]; } completion:^(BOOL finished) { }]; 

为Swift 编码

  UIView.transition(with: myLabel, duration: 0.20, options: .transitionFlipFromBottom, animations: {() -> Void in self.myLabel.textColor = UIColor.red }, completion: {(_ finished: Bool) -> Void in }) 

Answer 3

即使你说接受的答案有效，（1）你需要使用TransitionCrossDissolve而不是CurveEaseInOut ; （2）在testing的时候，我注意到，在Swift中，好像在animation之前不能立即添加子视图。 （我认为这是一个错误。）

看起来myLabel在你的例子中似乎是本地的（因为全局variables必须在blockclosures中写成self.myLabel ），所以很有可能你在animation的同一个方法中添加了myLabel子视图，没有延迟。

所以，如果你仍然遇到问题，我build议（1）使myLabel全球和（2）添加子视图和执行该子视图上的animation之间的延迟，例如：

  self.view.addSubview(myLabel) var timer = NSTimer.scheduledTimerWithTimeInterval(0.01, target: self, selector: "animate", userInfo: nil, repeats: false) } func animate() { UIView.transitionWithView(myLabel, duration: 5.0, options: UIViewAnimationOptions.TransitionCrossDissolve, animations: { self.myLabel.textColor = UIColor.redColor() }, completion:nil) }