Swift3 在swift 3中绘制动画圆圈
参考文献: 如何在单击evnet时擦除和重画圆圈? 我试图在单击事件上调用addCircleView方法,但每次循环都是重叠的Swift3 在swift 3中绘制动画圆圈,swift3,uibezierpath,Swift3,Uibezierpath,参考文献: 如何在单击evnet时擦除和重画圆圈? 我试图在单击事件上调用addCircleView方法,但每次循环都是重叠的 class CircleClosing: UIView { var circleLayer: CAShapeLayer! override init(frame: CGRect) { super.init(frame: frame) self.backgroundColor = UIColor.clear // Use UIBezierPa
class CircleClosing: UIView {
var circleLayer: CAShapeLayer!
override init(frame: CGRect) {
super.init(frame: frame)
self.backgroundColor = UIColor.clear
// Use UIBezierPath as an easy way to create the CGPath for the layer.
// The path should be the entire circle.
let circlePath : UIBezierPath!
circlePath = UIBezierPath(arcCenter: CGPoint(x: frame.size.width / 2.0, y: frame.size.height / 2.0), radius: (frame.size.width - 5)/2, startAngle: 0.0, endAngle: CGFloat(M_PI * 2.0), clockwise: true)
// Setup the CAShapeLayer with the path, colors, and line width
circleLayer = CAShapeLayer()
circleLayer.path = circlePath.cgPath
circleLayer.fillColor = UIColor.clear.cgColor
circleLayer.strokeColor = UIColor.blue.cgColor
circleLayer.lineWidth = 20.0;
// Don't draw the circle initially
circleLayer.strokeEnd = 0.0
// Add the circleLayer to the view's layer's sublayers
}
override func layoutSubviews()
{
let frame = self.layer.bounds
circleLayer.frame = frame
layer.addSublayer(circleLayer)
}
required init?(coder aDecoder: NSCoder)
{ super.init(coder: aDecoder) }
func animateCircle(duration: TimeInterval) {
// We want to animate the strokeEnd property of the circleLayer
let animation = CABasicAnimation(keyPath: "strokeEnd")
// Set the animation duration appropriately
animation.duration = duration
// Animate from 0 (no circle) to 1 (full circle)
animation.fromValue = 0
animation.toValue = 1
// Do a linear animation (i.e. the speed of the animation stays the same)
animation.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionLinear)
// Set the circleLayer's strokeEnd property to 1.0 now so that it's the
// right value when the animation ends.
circleLayer.strokeEnd = 1.0
// Do the actual animation
circleLayer.add(animation, forKey: "animateCircle")
}
}
添加子视图
func addCircleView() {
var circleView : CircleClosing!
let diceRoll = CGFloat(510) //CGFloat(Int(arc4random_uniform(7))*50)
let diceRolly = CGFloat(70)
let circleWidth = CGFloat(40)
let circleHeight = circleWidth
// Create a new CircleView
circleView = CircleClosing(frame:CGRect(x:diceRoll,y: diceRolly,width: circleWidth,height: circleHeight) )
view.addSubview(circleView)
// Animate the drawing of the circle over the course of 1 second
circleView.animateCircle(duration: 20.0)
}
提前感谢在添加新视图之前声明circleView全局并从superview中删除。@谢谢,我忘记了这件小事:-)欢迎@johnyDiOs,如果有帮助,您可以接受我的回答。在创建之前,您不能删除UIView。。顺便说一句,谢谢你的回答,这就是为什么我提到“全球申报”
var circleView : CircleClosing!
func addCircleView() {
let diceRoll = CGFloat(510) //CGFloat(Int(arc4random_uniform(7))*50)
let diceRolly = CGFloat(70)
let circleWidth = CGFloat(40)
let circleHeight = circleWidth
//Add this line here to remove from superview
circleView.removeFromSuperview()
circleView = CircleClosing(frame:CGRect(x:diceRoll,y: diceRolly,width: circleWidth,height: circleHeight) )
view.addSubview(circleView)
// Animate the drawing of the circle over the course of 1 second
circleView.animateCircle(duration: 20.0)
}