LoaderBallPulseAnimation.swift
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//
// LoaderBallPulseAnimation.swift
// LoaderButton
//
// Created by 黄进文 on 2018/6/12.
// Copyright © 2018年 Jovins. All rights reserved.
//
import UIKit
class LoaderBallPulseAnimation: 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 space: CGFloat = 2
let circleSize: CGFloat = (sizeValue - 2 * space) / 3
let x: CGFloat = padding * 0.5
let y: CGFloat = (layer.bounds.size.height - circleSize) * 0.5
let duration: CFTimeInterval = 0.75
let beginTime = CACurrentMediaTime()
let beginTimes: [CFTimeInterval] = [0.12, 0.24, 0.36]
let timingFunction = CAMediaTimingFunction(controlPoints: 0.2, 0.68, 0.18, 1.08)
let animation = CAKeyframeAnimation(keyPath: "transform.scale")
animation.keyTimes = [0, 0.3, 1]
animation.timingFunctions = [timingFunction, timingFunction]
animation.values = [1, 0.3, 1]
animation.duration = duration
animation.repeatCount = HUGE
animation.isRemovedOnCompletion = false
/// Draw circles
for i in 0..<3 {
let circle = LoaderShape.circle.layer(with: CGSize(width: circleSize, height: circleSize), color: color)
let frame = CGRect(x: x + circleSize * CGFloat(i) + space * CGFloat(i),
y: y, width: circleSize, height: circleSize)
animation.beginTime = beginTime + beginTimes[i]
circle.frame = frame
circle.add(animation, forKey: "animation")
layer.addSublayer(circle)
}
}
}