我仍在努力学习这部分内容。我环顾四周并阅读了一些关于它的问题，但实际上我并不了解其中任何一个。
我有一个创建并绘制圆圈的圆圈
class CircleView: UIView {
var circleLayer: CAShapeLayer!
var isAnimating = false
override init(frame: CGRect) {
let fColor = UIColor.clear.cgColor
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(arcCenter: CGPoint(x: frame.size.width / 2.0, y: frame.size.height / 2.0), radius: (frame.size.width - 10)/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.init(rgbColorCodeRed: 230, green: 226, blue: 218, alpha: 1).cgColor
circleLayer.lineWidth = 9.0;
// Don't draw the circle initially
circleLayer.strokeEnd = 0.0
// Add the circleLayer to the view's layer's sublayers
layer.addSublayer(circleLayer)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func setCircleClockwise(){
let circlePath = UIBezierPath(arcCenter: CGPoint(x: frame.size.width / 2.0, y: frame.size.height / 2.0), radius: (frame.size.width - 10)/2, startAngle: 0.0, endAngle: CGFloat(M_PI * 2.0), clockwise: true)
self.circleLayer.removeFromSuperlayer()
self.circleLayer = formatCirle(circlePath: circlePath)
self.layer.addSublayer(self.circleLayer)
}
func setCircleCounterClockwise(){
let circlePath = UIBezierPath(arcCenter: CGPoint(x: frame.size.width / 2.0, y: frame.size.height / 2.0), radius: (frame.size.width - 10)/2, startAngle: 0.0, endAngle: CGFloat(M_PI * 2.0), clockwise: false)
self.circleLayer.removeFromSuperlayer()
self.circleLayer = formatCirle(circlePath: circlePath)
self.layer.addSublayer(self.circleLayer)
}
func formatCirle(circlePath: UIBezierPath) -> CAShapeLayer{
let circleShape = CAShapeLayer()
circleShape.path = circlePath.cgPath
circleShape.fillColor = UIColor.clear.cgColor
circleShape.strokeColor = UIColor.init(rgbColorCodeRed: 230, green: 226, blue: 218, alpha: 1).cgColor
circleShape.lineWidth = 9.0;
circleShape.strokeEnd = 0.0
return circleShape
}
func animate(duration: TimeInterval){
self.isAnimating = true
self.animateCircleFull(duration: 1)
}
func endAnimate(){
self.isAnimating = false
}
func animateCircleFull(duration: TimeInterval) {
if self.isAnimating{
CATransaction.begin()
let animation = CABasicAnimation(keyPath: "strokeEnd")
animation.duration = duration
animation.fromValue = 0
animation.toValue = 1
animation.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseInEaseOut)
circleLayer.strokeEnd = 1.0
CATransaction.setCompletionBlock {
self.setCircleCounterClockwise()
self.animateCircleEmpty(duration: duration)
}
// Do the actual animation
circleLayer.add(animation, forKey: "animateCircle")
CATransaction.commit()
}
}
func animateCircleEmpty(duration: TimeInterval){
if self.isAnimating{
CATransaction.begin()
let animation = CABasicAnimation(keyPath: "strokeEnd")
animation.duration = duration
animation.fromValue = 1
animation.toValue = 0
animation.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseInEaseOut)
circleLayer.strokeEnd = 0
CATransaction.setCompletionBlock {
self.setCircleClockwise()
self.animateCircleFull(duration: duration)
}
// Do the actual animation
circleLayer.add(animation, forKey: "animateCircle")
CATransaction.commit()
}
}
使用以下函数从我的viewController调用。一切正常，但我无法解决的问题是如何在同一个圆上调用endAnimation函数？
func addCircleView() {
let diceRoll = CGFloat(Int(arc4random_uniform(7))*50)
var circleWidth = CGFloat(100)
var circleHeight = circleWidth
var bgColor: UIColor = UIColor.init(rgbColorCodeRed: 230, green: 226, blue: 218, alpha: 1)
// Create a new CircleView
let circleView = CircleView(frame: CGRect(x: self.view.frame.width/2, y: self.view.frame.height-110, width: circleWidth, height: circleHeight))
//let test = CircleView(frame: CGRect(x: diceRoll, y: 0, width: circleWidth, height: circleHeight))
cv = circleView
view.addSubview(circleView)
// Animate the drawing of the circle over the course of 1 second
circleView.animate(duration: 1)
let imageName = "ButtonBackground.png"
let image = UIImage(named: imageName)
let imageView = UIImageView(image: image!)
imageView.frame = CGRect(x: self.view.frame.width/2, y: self.view.frame.height-110, width: 100, height: 100)
view.addSubview(imageView)
view.bringSubview(toFront: circleView)
}
答案 0 :(得分：0)
要在同一个圆上调用endAnimation函数，必须在ViewController类中声明属性。
import UIKit
class ViewController: UIViewController {
var circleView = CircleView()
override func viewDidLoad() {
super.viewDidLoad()
self.addCircleView()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func addCircleView() {
let diceRoll = CGFloat(Int(arc4random_uniform(7))*50)
var circleWidth = CGFloat(100)
var circleHeight = circleWidth
var bgColor: UIColor = UIColor.init(rgbColorCodeRed: 230, green: 226, blue: 218, alpha: 1)
// Create a new CircleView
self.circleView = CircleView(frame: CGRect(x: self.view.frame.width/2, y: self.view.frame.height-110, width: circleWidth, height: circleHeight))
//let test = CircleView(frame: CGRect(x: diceRoll, y: 0, width: circleWidth, height: circleHeight))
cv = circleView
view.addSubview(circleView)
// Animate the drawing of the circle over the course of 1 second
circleView.animate(duration: 1)
let imageName = "ButtonBackground.png"
let image = UIImage(named: imageName)
let imageView = UIImageView(image: image!)
imageView.frame = CGRect(x: self.view.frame.width/2, y: self.view.frame.height-110, width: 100, height: 100)
view.addSubview(imageView)
view.bringSubview(toFront: circleView)
//now you are able to call endAnimation function
self.circleView.endAnimate()
}
}