Swift 3动画问题
Swift 3 animation issue
我正在实现进度视图,它只是为颜色设置动画。
一切正常,除了 "strokeEnd" 按形状填充并使其闪烁的动画。
视频resource
代码示例:
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()
}
}
}
您可以通过在初始化程序中将 strokeStart 设置为 outAnimation
的最终值来解决闪烁问题:
circularLayer.strokeStart = 1.0
原因是 CAPropertyAnimation
动画的 属性 的实际值不会自动设置为动画的 toValue
,因此它恢复为原始值 0.0
在你的情况下。这就是为什么一段时间会出现一个完整的圆圈。
然而,在下一个圆圈出现之前会有延迟,不确定这是您的意图还是要修复的另一个错误。
我正在实现进度视图,它只是为颜色设置动画。
一切正常,除了 "strokeEnd" 按形状填充并使其闪烁的动画。
视频resource
代码示例:
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()
}
}
}
您可以通过在初始化程序中将 strokeStart 设置为 outAnimation
的最终值来解决闪烁问题:
circularLayer.strokeStart = 1.0
原因是 CAPropertyAnimation
动画的 属性 的实际值不会自动设置为动画的 toValue
,因此它恢复为原始值 0.0
在你的情况下。这就是为什么一段时间会出现一个完整的圆圈。
然而,在下一个圆圈出现之前会有延迟,不确定这是您的意图还是要修复的另一个错误。