LoaderCircleRotateAnimation.swift
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//
// LoaderBallClipRefreshAnimation.swift
// LoaderButton
//
// Created by 黄进文 on 2018/6/13.
// Copyright © 2018年 Jovins. All rights reserved.
//
import UIKit
class LoaderCircleRotateAnimation: 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: CGFloat = max(min(frame.width+8, frame.height) - padding, 1.0)
/// Rotate Animation
let rotateAnimation = CAKeyframeAnimation(keyPath: "transform.rotation.z")
rotateAnimation.keyTimes = [0, 0.5, 1.0].map{ NSNumber(value: $0) }
rotateAnimation.values = [0, Double.pi, 2 * Double.pi].map{ NSNumber(value: $0) }
let animationGroup = CAAnimationGroup()
animationGroup.duration = 0.75
animationGroup.repeatCount = .infinity
animationGroup.animations = [rotateAnimation]
let circle = LoaderShape.ringThirdFour.layer(with: CGSize(width: sizeValue, height: sizeValue), color: color)
circle.frame = CGRect(x: padding * 0.5+3, y: padding * 0.5,
width: sizeValue, height: sizeValue)
circle.add(animationGroup, forKey: "animation")
layer.addSublayer(circle)
}
}