我想在 swift 中制作一个简单的循环进度条。到目前为止我没能做到的是，进度应该从圆的顶部开始(目前它是从 90 度点开始的)。我还想在进度线下方有一条圆形线，它应该比进度线更粗并且颜色也不同。
任何人都可以让我朝着正确的方向前进吗？
这是我的功能:
func animateView() {
let circle = viewProgress // viewProgress is a UIView
var progressCircle = CAShapeLayer()
let circlePath = UIBezierPath(ovalInRect: circle.bounds)
progressCircle = CAShapeLayer ()
progressCircle.path = circlePath.CGPath
progressCircle.strokeColor = UIColor.greenColor().CGColor
progressCircle.fillColor = UIColor.clearColor().CGColor
progressCircle.lineWidth = 5.0
circle.layer.addSublayer(progressCircle)
let animation = CABasicAnimation(keyPath: "strokeEnd")
animation.fromValue = 0
animation.toValue = 1.5
animation.duration = 1
animation.fillMode = kCAFillModeForwards
animation.removedOnCompletion = false
progressCircle.addAnimation(animation, forKey: "ani")
}
Igor 这是它的样子:
最佳答案
对于 swift 4
声明两个 CAShapeLayers。一个用于实际循环，另一个用于进度层!
func createCircularPath() {
let circleLayer = CAShapeLayer()
let progressLayer = CAShapeLayer()
let center = self.view.center
let circularPath = UIBezierPath(arcCenter: center, radius: 100, startAngle: -.pi / 2, endAngle: 2 * .pi, clockwise: true)
circleLayer.path = circularPath.cgPath
circleLayer.fillColor = UIColor.clear.cgColor
circleLayer.strokeColor = UIColor.lightGray.cgColor
circleLayer.lineCap = .round
circleLayer.lineWidth = 20.0 //for thicker circle compared to progressLayer
progressLayer.path = circularPath.cgPath
progressLayer.fillColor = UIColor.clear.cgColor
progressLayer.strokeColor = UIColor.blue.cgColor
progressLayer.lineCap = .round
progressLayer.lineWidth = 10.0
progressLayer.strokeEnd = 0
view.addSublayer(circleLayer)
view.addSublayer(progressLayer)
let progressAnimation = CABasicAnimation(keyPath: "strokeEnd")
progressAnimation.toValue = 1
progressAnimation.fillMode = .forwards
progressAnimation.isRemovedOnCompletion = false
progressLayer.add(progressAnimation, forKey: "progressAnim")
}
编码愉快!
希望这个答案对您有所帮助:]
关于ios - swift 中的循环进度，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/40176481/