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Sample for explain how to use Cubic Bezier to start a new animation from past animations progression. - https://github.com/Calvin-Huang/CHProgressSuit/blob/master/CHProgressSuit/CircularProgress.swift
//
// CircularProgress.swift
// CHProgressSuit
//
// Created by Calvin on 6/26/16.
// Copyright © 2016 CapsLock. All rights reserved.
//
import UIKit
import CHCubicBezier
@IBDesignable
public class CircularProgress: UIView {
@IBInspectable public var progressBarColor: UIColor! {
didSet {
progressBar.strokeColor = progressBarColor.CGColor
}
}
@IBInspectable public var progressRingColor: UIColor! {
didSet {
progressRing.strokeColor = progressRingColor.CGColor
}
}
@IBInspectable public var fillColor: UIColor! {
didSet {
fillBackground.fillColor = fillColor.CGColor
}
}
@IBInspectable public var textColor: UIColor! {
didSet {
progressText.foregroundColor = textColor.CGColor
}
}
@IBInspectable public var progress: CGFloat = 0 {
didSet {
var targetProgress = progress
if progress > 1 {
targetProgress = 1
} else if progress < 0 {
targetProgress = 0
}
progress = targetProgress
progressAnimation.values = [currentProgress, targetProgress]
progressAnimation.keyTimes = [0, 1]
let controlPoints: (Float, Float, Float, Float) = (Float(cubicBezier.controlPoints.x1), Float(cubicBezier.controlPoints.y1), Float(cubicBezier.controlPoints.x2), Float(cubicBezier.controlPoints.y2))
progressAnimation.timingFunction = CAMediaTimingFunction(controlPoints: controlPoints.0, controlPoints.1, controlPoints.2, controlPoints.3)
progressBar.addAnimation(progressAnimation, forKey: nil)
countingStartTime = NSDate.timeIntervalSinceReferenceDate()
countingStartValue = currentProgress
if displayLink == nil {
displayLink = CADisplayLink(target: self, selector: #selector(updateProgress))
displayLink?.addToRunLoop(NSRunLoop.mainRunLoop(), forMode: NSDefaultRunLoopMode)
}
}
}
@IBInspectable var duration: Double = 0.25 {
didSet {
progressAnimation.duration = duration
}
}
public var easing: CubicBezier.Easing! {
didSet {
cubicBezier = CubicBezier(easing: easing)
}
}
public var animateCompletion: ((progress: CGFloat) -> ())?
private let progressBar = CAShapeLayer()
private let progressRing = CAShapeLayer()
private let fillBackground = CAShapeLayer()
private let progressText = CATextLayer()
private let progressAnimation = CAKeyframeAnimation(keyPath: "strokeEnd")
private var cubicBezier: CubicBezier!
private var displayLink: CADisplayLink?
private var countingStartTime: NSTimeInterval!
private var countingStartValue: CGFloat = 0
private var currentProgress: CGFloat = 0
// Default style is designed in width 168
private var scaleRate: CGFloat {
return self.bounds.width / 168
}
private var progressWidth: CGFloat {
return 20 * scaleRate
}
private var progressLength: CGFloat {
return min(self.bounds.width - progressWidth, self.bounds.height - progressWidth)
}
private var fontSize: CGFloat {
return 72 * scaleRate
}
convenience public init(progress: CGFloat) {
self.init(frame: CGRectZero)
self.progress = progress
}
override init(frame: CGRect) {
super.init(frame: frame)
self.initPropertiesDefaultValue()
self.initUI()
self.configure()
}
required public init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
self.initPropertiesDefaultValue()
self.initUI()
self.configure()
}
// MARK: - Override Methods
override public func layoutSubviews() {
super.layoutSubviews()
let rectInCenter = CGRect(origin: CGPoint(x: progressWidth / 2, y: progressWidth / 2), size: CGSize(width: progressLength, height: progressLength))
progressRing.frame = rectInCenter
progressBar.frame = rectInCenter
fillBackground.frame = rectInCenter
progressRing.lineWidth = progressWidth
progressBar.lineWidth = progressWidth
let circularPath = UIBezierPath(roundedRect: progressRing.bounds, cornerRadius: progressLength / 2).CGPath
progressRing.path = circularPath
progressBar.path = circularPath
fillBackground.path = circularPath
// Unwarp variables
guard let progressString = progressText.string else { return }
// This code is only availble for iOS 8.4+.
// However, our company project supports iOS 8, I need to use APIs availble in iOS 8
// let font = UIFont.systemFontOfSize(fontSize, weight: UIFontWeightMedium)
let font = UIFont(name: "HelveticaNeue-Medium", size: fontSize)!
let textSize = progressString.sizeWithAttributes([NSFontAttributeName: font])
progressText.font = font
progressText.fontSize = fontSize
progressText.frame = CGRect(origin: CGPoint(x: 0, y: self.bounds.height / 2 - textSize.height / 2), size: CGSize(width: self.bounds.width, height: textSize.height))
}
// MARK: - Selectors
func updateProgress() {
let nowTime = NSDate.timeIntervalSinceReferenceDate()
let changeTime = nowTime - countingStartTime
if changeTime > Double(duration) {
displayLink?.invalidate()
displayLink = nil
animateCompletion?(progress: progress)
} else {
let changeValue = progress - countingStartValue
var t = changeTime / duration
if t > 0.91 {
t = 1
}
currentProgress = (countingStartValue + changeValue * CGFloat(cubicBezier.easing(t)))
progressText.string = "\((Int)(currentProgress * 100))"
}
}
// MARK: - Private Methods
private func initPropertiesDefaultValue() {
progressBarColor = UIColor(red: 33/255.0, green: 150/255.0, blue: 243/255.0, alpha: 1)
progressRingColor = UIColor(red: 187/255.0, green: 222/255.0, blue: 251/255.0, alpha: 1)
fillColor = UIColor.clearColor()
textColor = UIColor(red: 47/255.0, green: 125/255.0, blue: 183/255.0, alpha: 1)
duration = 0.25
easing = CubicBezier.Easing.EaseInOut
}
private func initUI() {
progressBar.fillColor = UIColor.clearColor().CGColor
progressRing.fillColor = UIColor.clearColor().CGColor
progressBar.strokeEnd = progress
// Disable implict animation
progressText.actions = ["contents": NSNull()]
progressText.contentsScale = UIScreen.mainScreen().scale
progressText.alignmentMode = kCAAlignmentCenter
progressText.string = "\((Int)(progress))"
self.layer.addSublayer(fillBackground)
self.layer.addSublayer(progressRing)
self.layer.addSublayer(progressBar)
self.layer.addSublayer(progressText)
}
private func configure() {
progressAnimation.timingFunction = CAMediaTimingFunction(controlPoints: 0.42, 0, 0.58, 1)
progressAnimation.removedOnCompletion = false
progressAnimation.fillMode = kCAFillModeForwards
}
}
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