LoaderRotateChaseAnimation.swift
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//
// LoaderRotateChaseAnimation.swift
// LoaderButton
//
// Created by 黄进文 on 2018/6/11.
// Copyright © 2018年 Jovins. All rights reserved.
//
import UIKit
class LoaderRotateChaseAnimation: 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 size = max(min(frame.width, frame.height) - padding, 1.0)
let center = CGPoint(x: size * 0.5 + padding * 0.5, y: size * 0.5 + padding * 0.5)
let circleSize = size / 6
for i in 0..<5 {
let factor = Float(i) * 1 / 5
let circle = LoaderShape.circle.layer(with: CGSize(width: circleSize, height: circleSize), color: color)
let animation = rotateAnimation(factor, x: center.x, y: center.y,
size: CGSize(width: size - circleSize, height: size - circleSize))
circle.frame = CGRect(x: 0, y: 0, width: circleSize, height: circleSize)
circle.add(animation, forKey: "animation")
layer.addSublayer(circle)
}
}
/// Rotate Animation
///
/// - Parameters:
/// - rate: rate of rotation
/// - x: X value of center
/// - y: Y value of center
/// - size: size of spinner
/// - Returns: Rotate Animation group
private func rotateAnimation(_ rate: Float, x: CGFloat, y: CGFloat, size: CGSize) -> CAAnimationGroup {
let duration: CFTimeInterval = 1.5
let frameScale = 1 - rate
let toScale = 0.2 + rate
let timeFunc = CAMediaTimingFunction(controlPoints: 0.5, 0.15 + rate, 0.25, 1)
/// scale
let scaleAnimation = CABasicAnimation(keyPath: "transform.scale")
scaleAnimation.duration = duration
scaleAnimation.repeatCount = HUGE
scaleAnimation.fromValue = frameScale
scaleAnimation.toValue = toScale
/// position
let positionAnimation = CAKeyframeAnimation(keyPath: "position")
positionAnimation.duration = duration
positionAnimation.repeatCount = HUGE
positionAnimation.path = UIBezierPath(arcCenter: CGPoint(x: x, y: y),
radius: size.width * 0.5,
startAngle: CGFloat(3 * Double.pi * 0.5),
endAngle: CGFloat(3 * Double.pi * 0.5 + 2 * Double.pi),
clockwise: true).cgPath
/// animation
let animation = CAAnimationGroup()
animation.animations = [scaleAnimation, positionAnimation]
animation.timingFunction = timeFunc
animation.duration = duration
animation.repeatCount = HUGE
animation.isRemovedOnCompletion = false
return animation
}
}