我正在尝试在两个不同的渐变之间无休止地旋转背景色,但是实际过渡的持续时间没有预期的长(持续时间不到一秒钟,每次过渡之间没有延迟)。
var backgroundColours = [CAGradientLayer()]
var backgroundLoop = 0
override func viewDidLoad() {
super.viewDidLoad()
backgroundColours = [Colors.init().one, Colors.init().two] // These are two CAGradientLayers but I haven't included their code
backgroundLoop = 0
self.animateBackgroundColour()
}
func animateBackgroundColour () {
backgroundLoop = (backgroundLoop + 1) % (backgroundColours.count)
UIView.animate(withDuration: 2.0, delay: 2.0, options: .curveLinear, animations: {
self.view.backgroundColor = UIColor.clear
let backgroundLayer = self.backgroundColours[self.backgroundLoop]
backgroundLayer.frame = self.view.frame
self.view.layer.insertSublayer(backgroundLayer, at: 0)
}, completion: { (Bool) -> Void in
self.animateBackgroundColour()
})
这一切都在ViewController
类
答案 0 :(得分:0)
UIView.animate
仅对五个专门的 view 属性设置动画。您没有为任何这些属性设置动画。您想要的是 layer 动画(例如CABasicAnimation)。