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我正在實現簡單地動畫顏色的進度視圖。Swift 3動畫問題
一切工作正常exept「strokeEnd」動畫是由形狀填充,並使其閃爍。
視頻resource
代碼示例:
circularLayer.strokeStart = 1.0
的原因是:
class MaterialCircularProgressView: UIView {
let circularLayer = CAShapeLayer()
let googleColors = [
UIColor(red:0.282, green:0.522, blue:0.929, alpha:1),
UIColor(red:0.859, green:0.196, blue:0.212, alpha:1),
UIColor(red:0.957, green:0.761, blue:0.051, alpha:1),
UIColor(red:0.235, green:0.729, blue:0.329, alpha:1)
]
let inAnimation: CAAnimation = {
let animation = CABasicAnimation(keyPath: "strokeEnd")
animation.fromValue = 0.0
animation.toValue = 1.0
animation.duration = 1.0
animation.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseIn)
return animation
}()
let outAnimation: CAAnimation = {
let animation = CABasicAnimation(keyPath: "strokeStart")
animation.beginTime = 0.5
animation.fromValue = 0.0
animation.toValue = 1.0
animation.duration = 1.0
animation.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseOut)
return animation
}()
let rotationAnimation: CAAnimation = {
let animation = CABasicAnimation(keyPath: "transform.rotation.z")
animation.fromValue = 0.0
animation.toValue = 2 * M_PI
animation.duration = 2.0
animation.repeatCount = MAXFLOAT
return animation
}()
var colorIndex : Int = 0
override init(frame: CGRect) {
super.init(frame: frame)
circularLayer.lineWidth = 4.0
circularLayer.fillColor = nil
layer.addSublayer(circularLayer)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func layoutSubviews() {
super.layoutSubviews()
let center = CGPoint(x: bounds.midX, y: bounds.midY)
let radius = min(bounds.width, bounds.height)/2 - circularLayer.lineWidth/2
let arcPath = UIBezierPath(arcCenter: CGPoint.zero, radius: radius, startAngle: CGFloat(M_PI_2), endAngle: CGFloat(M_PI_2 + (2 * M_PI)), clockwise: true)
circularLayer.position = center
circularLayer.path = arcPath.cgPath
animateProgressView()
circularLayer.add(rotationAnimation, forKey: "rotateAnimation")
}
func animateProgressView() {
circularLayer.removeAnimation(forKey: "strokeAnimation")
circularLayer.strokeColor = googleColors[colorIndex].cgColor
let strokeAnimationGroup = CAAnimationGroup()
strokeAnimationGroup.duration = 1.0 + outAnimation.beginTime
strokeAnimationGroup.repeatCount = 1
strokeAnimationGroup.animations = [inAnimation, outAnimation]
strokeAnimationGroup.delegate = self
circularLayer.add(strokeAnimationGroup, forKey: "strokeAnimation")
colorIndex += 1;
colorIndex = colorIndex % googleColors.count;
}
}
extension MaterialCircularProgressView: CAAnimationDelegate{
override func animationDidStop(_ anim: CAAnimation, finished flag: Bool) {
if(flag) {
animateProgressView()
}
}
}
你是對的這個問題。 –