在 Swift 中动画 UILabel 文本颜色 [英] Animate UILabel text color in Swift
本文介绍了在 Swift 中动画 UILabel 文本颜色的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
如何使用 swift 为 UILabel 的颜色变化设置动画?我看到有人提到使用 CALayer,但我无法弄清楚 Swift 语法.
How can I animate a color change of UILabel using swift? I have seen people mention using CALayer but I cannot figure out the Swift syntax.
这是一个Objective-C的例子
This is an example of Objective-C
CALayer *layer = myView.layer;
CATextLayer *textLayer = [CATextLayer layer];
[textLayer setString:@"My string"];
[textLayer setForegroundColor:initialColor;
[textLayer setFrame:self.bounds];
[[self.view layer] addSublayer:textLayer];
[UIView animateWithDuration:0.5 animations:^{
textLayer.foregroundColor = finalColor;
}];
推荐答案
比使用 CALayer 容易多了
it is much easier than working with CALayer
let myLabel: UILabel!
UIView.animateWithDuration(2, animations: { () -> Void in
myLabel.backgroundColor = UIColor.redColor();
})
就是这样...
编辑
好的,抱歉,我不知道您要更改什么颜色...我已将您的示例转换为 swift 代码...
Ok, sorry I didn't knew what color you want to change... I have converted your example to swift code...
第一次
import QuartzCore
比
if let layer: CALayer = self.view.layer as CALayer? {
if let textLayer = CATextLayer() as CATextLayer? {
textLayer.string = "My string"
textLayer.foregroundColor = UIColor.whiteColor().CGColor
textLayer.frame = self.view.bounds
self.view.layer.addSublayer(textLayer)
UIView.animateWithDuration(0.5, animations: { () -> Void in
textLayer.foregroundColor = UIColor.redColor().CGColor
})
}
}
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