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//
// LoaderLineFadeAnimation.swift
// LoaderButton
//
// Created by 黄进文 on 2018/6/11.
// Copyright © 2018年 Jovins. All rights reserved.
//
import UIKit
class LoaderLineFadeAnimation: 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 = 4.0
let sizeValue = max(min(frame.width, frame.height) - padding, 1.0)
let center = CGPoint(x: sizeValue * 0.5 + padding * 0.5, y: sizeValue * 0.5 + padding * 0.5)
let duration: CFTimeInterval = 1.2
let beginTime = CACurrentMediaTime()
let beginTimes: [CFTimeInterval] = [0.12, 0.24, 0.36, 0.48, 0.6, 0.72, 0.84, 0.96]
let timingFunction = CAMediaTimingFunction(name: .easeInEaseOut)
/// animation
let animation = CAKeyframeAnimation(keyPath: "opacity")
animation.keyTimes = [0, 0.5, 1]
animation.timingFunctions = [timingFunction, timingFunction]
animation.values = [1, 0.1, 1]
animation.duration = duration
animation.repeatCount = HUGE
animation.isRemovedOnCompletion = false
let lineSpace: CGFloat = 2
let lineSize = CGSize(width: max((sizeValue - 4 * lineSpace) / 8, 1.0),
height: max((sizeValue - 2 * lineSpace) / 3, 1.0))
for i in 0..<8 {
let line = lineAt(angle: CGFloat(Double.pi / 4 * Double(i)),
size: lineSize,
origin: center,
containerSize: CGSize(width: sizeValue, height: sizeValue),
color: color)
animation.beginTime = beginTime + beginTimes[i]
line.add(animation, forKey: "animation")
layer.addSublayer(line)
}
}
private func lineAt(angle: CGFloat, size: CGSize, origin: CGPoint, containerSize: CGSize, color: UIColor) -> CALayer {
let radius = (containerSize.width * 0.5 - max(size.width, size.height) * 0.5) - 2
let lineContainerSize = CGSize(width: max(size.width, size.height), height: max(size.width, size.height))
let lineContainer = LoaderLayer()
let lineContainFrame = CGRect(x: origin.x + radius * (cos(angle) - 0.5),
y: origin.y + radius * (sin(angle) - 0.5),
width: lineContainerSize.width,
height: lineContainerSize.height)
let line = LoaderShape.line.layer(with: size, color: color)
let lineFrame = CGRect(x: (lineContainerSize.width - size.width) * 0.5,
y: (lineContainerSize.height - size.height) * 0.5,
width: size.width, height: size.height)
lineContainer.frame = lineContainFrame
line.frame = lineFrame
lineContainer.addSublayer(line)
lineContainer.sublayerTransform = CATransform3DMakeRotation(CGFloat(Double.pi * 0.5) + angle, 0, 0, 1)
return lineContainer
}
}
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