LoaderCircleChaseAnimation.swift
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//
// LoaderCircleStrokeAnimation.swift
// LoaderButton
//
// Created by 黄进文 on 2018/6/11.
// Copyright © 2018年 Jovins. All rights reserved.
//
import UIKit
class LoaderCircleChaseAnimation: LoaderButtonAnimationDelegate {
/// Setup Loader Layer
///
/// - Parameters:
/// - layer: layer Parent layer (Button layer)
/// - frame: frame of parant layer
/// - color: color of Loader
func setupLoaderButtonAnimation(layer: CALayer, frame: CGRect, color: UIColor) {
let padding: CGFloat = 10.0
let sizeValue = max(min(frame.width, frame.height) - padding, 1.0)
let beginTime: Double = 0.5
let strokeStartDuration: Double = 1.2
let strokeEndDuration: Double = 0.7
/// Animation
let rotationAnimation = CABasicAnimation(keyPath: "transform.rotation")
rotationAnimation.byValue = Float.pi * 2
rotationAnimation.timingFunction = CAMediaTimingFunction(name: .linear)
let strokeEndAnimation = CABasicAnimation(keyPath: "strokeEnd")
strokeEndAnimation.duration = strokeEndDuration
strokeEndAnimation.timingFunction = CAMediaTimingFunction(controlPoints: 0.4, 0.0, 0.2, 1.0)
strokeEndAnimation.fromValue = 0
strokeEndAnimation.toValue = 1
let strokeStartAnimation = CABasicAnimation(keyPath: "strokeStart")
strokeStartAnimation.duration = strokeStartDuration
strokeStartAnimation.timingFunction = CAMediaTimingFunction(controlPoints: 0.4, 0.2, 0.0, 1.0)
strokeStartAnimation.fromValue = 0
strokeStartAnimation.toValue = 1
strokeStartAnimation.beginTime = beginTime
let groupAnimation = CAAnimationGroup()
groupAnimation.animations = [rotationAnimation, strokeEndAnimation, strokeStartAnimation]
groupAnimation.duration = strokeStartDuration + beginTime
groupAnimation.repeatCount = .infinity
groupAnimation.isRemovedOnCompletion = false
groupAnimation.fillMode = .forwards
let circle = LoaderShape.stroke.layer(with: CGSize(width: sizeValue, height: sizeValue), color: color)
let frame = CGRect(x: padding * 0.5, y: padding * 0.5, width: sizeValue, height: sizeValue)
circle.frame = frame
circle.add(groupAnimation, forKey: "animation")
layer.addSublayer(circle)
}
}