我试图做一个动画甜甜圈观点,即0和100之间的给定值时,它会动画轮看法高达这个数字。我有这个工作正常,但想从一个到另一个,然后又在周围的方式褪色的颜色。目前,当我加我的梯度,它会由左到右,而不是周围的圆环图的周长。
class CircleScoreView: UIView {
private let outerCircleLayer = CAShapeLayer()
private let outerCircleGradientLayer = CAGradientLayer()
private let outerCircleLineWidth: CGFloat = 5
override init(frame: CGRect) {
super.init(frame: .zero)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func layoutSubviews() {
super.layoutSubviews()
buildLayers()
}
/// Value must be within 0...100 range
func setScore(_ value: Int, animated: Bool = false) {
if value != 0 {
let clampedValue: CGFloat = CGFloat(value.clamped(to: 0...100)) / 100
if !animated {
outerCircleLayer.strokeEnd = clampedValue
} else {
let outerCircleAnimation = CABasicAnimation(keyPath: "strokeEnd")
outerCircleAnimation.duration = 1.0
outerCircleAnimation.fromValue = 0
outerCircleAnimation.toValue = clampedValue
outerCircleAnimation.timingFunction = CAMediaTimingFunction(name: .easeInEaseOut)
outerCircleLayer.strokeEnd = clampedValue
outerCircleLayer.add(outerCircleAnimation, forKey: "outerCircleAnimation")
}
outerCircleGradientLayer.colors = [Constant.Palette.CircleScoreView.startValue.cgColor,
Constant.Palette.CircleScoreView.middleValue.cgColor,
Constant.Palette.CircleScoreView.endValue.cgColor]
}
}
private func buildLayers() {
// Outer background circle
let arcCenter = CGPoint(x: frame.size.width / 2, y: frame.size.height / 2)
let startAngle = CGFloat(-0.5 * Double.pi)
let endAngle = CGFloat(1.5 * Double.pi)
let circlePath = UIBezierPath(arcCenter: arcCenter,
radius: (frame.size.width - outerCircleLineWidth) / 2,
startAngle: startAngle,
endAngle: endAngle,
clockwise: true)
// Outer circle
setupOuterCircle(outerCirclePath: circlePath)
}
private func setupOuterCircle(outerCirclePath: UIBezierPath) {
outerCircleLayer.path = outerCirclePath.cgPath
outerCircleLayer.fillColor = UIColor.clear.cgColor
outerCircleLayer.strokeColor = UIColor.black.cgColor
outerCircleLayer.lineWidth = outerCircleLineWidth
outerCircleLayer.lineCap = CAShapeLayerLineCap.round
outerCircleGradientLayer.startPoint = CGPoint(x: 0.0, y: 0.5)
outerCircleGradientLayer.endPoint = CGPoint(x: 1.0, y: 0.5)
outerCircleGradientLayer.frame = bounds
outerCircleGradientLayer.mask = outerCircleLayer
layer.addSublayer(outerCircleGradientLayer)
}
}
我打算像this但颜色不是一个块,但梯度周围的甜甜圈视图从一种颜色到下一个。
如果导入AngleGradientLayer到你的项目,那么所有你应该需要做的是改变:
private let outerCircleGradientLayer = CAGradientLayer()
到
private let outerCircleGradientLayer = AngleGradientLayer()