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UIViewPropertyAnimator example
import UIKit
import PlaygroundSupport
class AnimatorExampleViewController: UIViewController {
let startButton = UIButton()
let pauseButton = UIButton()
let stopButton = UIButton()
let resetButton = UIButton()
let reverseButton = UIButton()
let slider = UISlider()
let rect = UIView()
let propertyAnimator: UIViewPropertyAnimator = UIViewPropertyAnimator(duration: 5.0, curve: UIViewAnimationCurve.easeInOut)
override func viewDidLoad() {
view.backgroundColor = UIColor.white
rect.frame = CGRect(x: 0, y: 50, width: 100, height: 100)
rect.backgroundColor = UIColor.red
view.addSubview(rect)
startButton.frame = CGRect(x: 50, y: 300, width: 60, height: 30)
startButton.setTitle("Start", for: UIControlState.normal)
startButton.setTitleColor(UIColor.black, for: UIControlState.normal)
startButton.setTitleColor(UIColor.gray, for: UIControlState.disabled)
startButton.addTarget(self, action: #selector(startAnimation), for: UIControlEvents.touchUpInside)
view.addSubview(startButton)
pauseButton.frame = CGRect(x: 120, y: 300, width: 60, height: 30)
pauseButton.setTitle("Pause", for: UIControlState.normal)
pauseButton.setTitleColor(UIColor.black, for: UIControlState.normal)
pauseButton.setTitleColor(UIColor.gray, for: UIControlState.disabled)
pauseButton.isEnabled = false
pauseButton.addTarget(self, action: #selector(pauseAnimation), for: UIControlEvents.touchUpInside)
view.addSubview(pauseButton)
stopButton.frame = CGRect(x: 190, y: 300, width: 60, height: 30)
stopButton.setTitle("Stop", for: UIControlState.normal)
stopButton.setTitleColor(UIColor.black, for: UIControlState.normal)
stopButton.setTitleColor(UIColor.gray, for: UIControlState.disabled)
stopButton.isEnabled = false
stopButton.addTarget(self, action: #selector(stopAnimation), for: UIControlEvents.touchUpInside)
view.addSubview(stopButton)
resetButton.frame = CGRect(x: 260, y: 300, width: 60, height: 30)
resetButton.setTitle("Reset", for: UIControlState.normal)
resetButton.setTitleColor(UIColor.black, for: UIControlState.normal)
resetButton.setTitleColor(UIColor.gray, for: UIControlState.disabled)
resetButton.isEnabled = false
resetButton.addTarget(self, action: #selector(resetAnimation), for: UIControlEvents.touchUpInside)
view.addSubview(resetButton)
reverseButton.frame = CGRect(x: 50, y: 360, width: 80, height: 30)
reverseButton.setTitle("Reverse", for: UIControlState.normal)
reverseButton.setTitleColor(UIColor.black, for: UIControlState.normal)
reverseButton.setTitleColor(UIColor.gray, for: UIControlState.disabled)
reverseButton.isEnabled = false
reverseButton.addTarget(self, action: #selector(reverseAnimation), for: UIControlEvents.touchUpInside)
view.addSubview(reverseButton)
slider.frame = CGRect(x: 50, y: 400, width: 200, height: 30)
slider.minimumValue = 0
slider.maximumValue = 1.0
slider.isContinuous = true
slider.addTarget(self, action: #selector(sliderValueChanged(_:)), for: UIControlEvents.valueChanged)
view.addSubview(slider)
propertyAnimator.addAnimations {
self.rect.center.x = 300
}
}
func startAnimation() {
startButton.isEnabled = false
pauseButton.isEnabled = true
stopButton.isEnabled = true
reverseButton.isEnabled = true
propertyAnimator.startAnimation()
}
func pauseAnimation() {
pauseButton.isEnabled = false
startButton.isEnabled = true
stopButton.isEnabled = true
reverseButton.isEnabled = false
propertyAnimator.pauseAnimation()
slider.value = Float(propertyAnimator.fractionComplete)
}
func stopAnimation() {
stopButton.isEnabled = false
startButton.isEnabled = false
pauseButton.isEnabled = false
resetButton.isEnabled = true
reverseButton.isEnabled = false
propertyAnimator.stopAnimation(false)
propertyAnimator.finishAnimation(at: .current)
slider.value = Float(propertyAnimator.fractionComplete)
}
func resetAnimation() {
self.rect.center.x = 50
propertyAnimator.addAnimations {
self.rect.center.x = 300
}
startButton.isEnabled = true
resetButton.isEnabled = false
reverseButton.isEnabled = false
slider.value = 0
}
func reverseAnimation() {
if (propertyAnimator.isRunning) {
propertyAnimator.isReversed = true
}
reverseButton.isEnabled = false
}
func sliderValueChanged(_ sender: UISlider) {
if propertyAnimator.isRunning {
propertyAnimator.pauseAnimation()
}
propertyAnimator.fractionComplete = CGFloat(sender.value)
}
}
PlaygroundPage.current.liveView = AnimatorExampleViewController() // containerView
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