新API - UIViewPropertyAnimator
UIViewPropertyAnimator是在iOS10才出现的一个用于动画的类，现在我们可以像看视频一样�暂停、跳转、回滚创造出来的动画。
测试环境
系统版本
10.11.5 Beta
Swift版本
Xcode8 beta 6(swift 3.0)
快速实现
playground是个玩耍的好地方，尝试一下吧～
创建简单动画场景
import UIKit
import PlaygroundSupport
public class TestPropertyAnimatorView:UIView {
var imageView:UIImageView!
var animator:UIViewPropertyAnimator!
override init(frame: CGRect) {
super.init(frame: frame)
initView()
initAnimator()
}
required public init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
//添加需要做动画的View
func initView() {
let image = UIImage(named: "growingup_108")
imageView = UIImageView(image: image)
imageView.frame = imageViewStartFrame()
imageView.center = {
let x = (frame.minX + imageView.frame.width / 2)
let y = (frame.maxY - imageView.frame.height / 2)
return CGPoint(x: x, y: y)
}()
self.addSubview(imageView)
}
}
extension TestPropertyAnimatorView {
public func initAnimator() {
animator = UIViewPropertyAnimator(duration: 5, curve: UIViewAnimationCurve.easeIn)
}
//添加动画
public func initAnimations() {
print("initAnimations")
imageView.frame = CGRect(x: 0, y: 0, width: 108, height: 108)
self.imageView.transform = CGAffineTransform(scaleX: 1, y: 1)
imageView.center = {
let x = (frame.minX + imageView.frame.width / 2)
let y = (frame.maxY - imageView.frame.height / 2)
return CGPoint(x: x, y: y)
}()
animator.addAnimations {
self.imageView.center = liveView.center
}
animator.addAnimations {
self.imageView.transform = CGAffineTransform(scaleX: 2, y: 2)
}
animator.addCompletion {
position in
switch position {
case .end:
print("动画结束回调: 动画结束")
case .current:
print("动画结束回调: 动画在当前进度结束")
case .start:
print("动画结束回调: 动画回滚结束")
}
}
}
}
试试在Playground中运行
//创建liveView
let liveView = TestPropertyAnimatorView(frame: CGRect(x: 0, y: 0, width: 500, height: 500))
//设置为当前展示的View
PlaygroundPage.current.liveView = liveView
liveView.initAnimations()
liveView.animator.startAnimation()
�继续往下看
添加上控制器试试
动画状态切换逻辑
ios10_animations_status.jpg
创建EventListener.swift
import Foundation
public class EventListener: NSObject {
public var eventFired: (() -> ())?
public func handleEvent() {
eventFired?()
}
}
添加Controller
public enum ButtonType {
case start,
pause,
stop,
reverse,
finishAtCurrent,
jumpTo
}
public protocol ControllerBarAnimationProtocol {
func initAnimator()
func initAnimations()
func addController(animator:UIViewPropertyAnimator)
}
public class ControllerBar:UIView {
var delegate:ControllerBarAnimationProtocol?
var slider:UISlider!
var jumpToPositionButton:UIButton!
var startButton:UIButton!
var pauseButton:UIButton!
var reverseButton:UIButton!
var stopButton:UIButton!
var finishAtCurrentButton:UIButton!
var sliderEventListener:EventListener!
var jumpToPositionButtonEventListener:EventListener!
var startButtonEventListener:EventListener!
var pauseButtonEventListener:EventListener!
var reverseButtonEventListener:EventListener!
var stopButtonEventListener:EventListener!
var finishAtCurrentButtonEventListener:EventListener!
var animator:UIViewPropertyAnimator!
var isPaused:Bool = false
init(frame: CGRect, animator:UIViewPropertyAnimator, delegate:ControllerBarAnimationProtocol?) {
super.init(frame: frame)
self.animator = animator
self.delegate = delegate
initView()
}
required public init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
private func initView() {
func createButton(frame:CGRect, title:String)->UIButton {
let button = UIButton(frame:frame)
button.backgroundColor = UIColor.gray
button.titleLabel?.textColor = UIColor.white
button.setTitle(title, for: UIControlState.normal)
return button
}
//slider
slider = UISlider(frame: CGRect(x: 0, y: 0, width: frame.width - 90, height: 50))
jumpToPositionButton = createButton(frame: CGRect(x: frame.width - 75, y:5, width: 70, height: 40), title: "跳转")
startButton = createButton(frame: CGRect(x: 0, y: 60, width: 60, height: 40), title:"开始")
pauseButton = createButton(frame: CGRect(x: 70, y: 60, width: 60, height: 40), title:"暂停")
reverseButton = createButton(frame: CGRect(x: 140, y: 60, width: 60, height: 40), title:"回滚")
stopButton = createButton(frame: CGRect(x: 210, y: 60, width: 60, height: 40), title:"结束")
finishAtCurrentButton = createButton(frame: CGRect(x: 280, y: 60, width: 150, height: 40), title:"在当前位置结束")
addSliderEventListener()
addButtonEventListener(type:.jumpTo)
addButtonEventListener(type:.start)
addButtonEventListener(type:.pause)
addButtonEventListener(type:.reverse)
addButtonEventListener(type:.stop)
addButtonEventListener(type:.finishAtCurrent)
self.addSubview(slider)
self.addSubview(jumpToPositionButton)
self.addSubview(startButton)
self.addSubview(pauseButton)
self.addSubview(reverseButton)
self.addSubview(stopButton)
self.addSubview(finishAtCurrentButton)
}
func addSliderEventListener() {
sliderEventListener = EventListener()
//添加Slide value变化回调
sliderEventListener.eventFired = {
//self.animator.fractionComplete = CGFloat(self.slider.value)
}
slider.addTarget(sliderEventListener, action: #selector(EventListener.handleEvent), for: .valueChanged)
}
func addButtonEventListener(type:ButtonType) {
switch type {
case .jumpTo:
jumpToPositionButtonEventListener = EventListener()
jumpToPositionButtonEventListener.eventFired = {
switch self.animator.state {
case .active:
print("操作：切换动画进度到:\(String(format:"%.2f%%",CGFloat(self.slider.value) * 100))")
self.animator.fractionComplete = CGFloat(self.slider.value)
break
default:
print("当前状态无法执行切换进度操作")
break
}
}
jumpToPositionButton.addTarget(jumpToPositionButtonEventListener, action: #selector(EventListener.handleEvent), for: .touchUpInside)
break
case .start:
startButtonEventListener = EventListener()
startButtonEventListener.eventFired = {
switch self.animator.state {
case .inactive:
print("状态：动画尚未开始")
print("操作：添加动画并开始")
self.delegate?.initAnimations()
self.animator.startAnimation()
self.isPaused = false
case .active:
print("状态：动画已经开始了")
default:
break
}
}
startButton.addTarget(startButtonEventListener, action: #selector(EventListener.handleEvent), for: .touchUpInside)
break
case .pause:
pauseButtonEventListener = EventListener()
pauseButtonEventListener.eventFired = {
switch self.animator.state {
case .inactive:
print("状态：动画尚未开始")
self.delegate?.initAnimations()
self.animator.startAnimation()
self.isPaused = false
case .active:
print("状态：动画已经开始了")
if self.isPaused {
print("当前状态 -> 暂停")
print("操作：继续动画过程")
self.animator.startAnimation()
self.isPaused = false
} else {
print("当前状态 -> 动画过程中")
print("操作：执行暂停操作")
self.animator.pauseAnimation()
self.isPaused = true
}
default:
print("当前状态无法执行暂停或恢复操作")
break
}
}
pauseButton.addTarget(pauseButtonEventListener, action: #selector(EventListener.handleEvent), for: .touchUpInside)
break
case .reverse:
reverseButtonEventListener = EventListener()
reverseButtonEventListener.eventFired = {
switch self.animator.state {
case .inactive:
print("状态：动画尚未开始，无法执行回滚操作")
case .active:
print("状态：动画已经开始了")
if self.isPaused {
print("当前状态 -> 暂停")
print("操作：继续动画过程并回滚")
self.animator.startAnimation()
self.isPaused = false
self.animator.isReversed = true
} else {
print("当前状态 -> 动画过程中")
print("操作：回滚动画")
self.animator.isReversed = true
}
default:
print("当前状态无法执行回滚操作")
break
}
}
reverseButton.addTarget(reverseButtonEventListener, action: #selector(EventListener.handleEvent), for: .touchUpInside)
break
case .stop:
stopButtonEventListener = EventListener()
stopButtonEventListener.eventFired = {
self.animator.stopAnimation(true)
}
stopButton.addTarget(stopButtonEventListener, action: #selector(EventListener.handleEvent), for: .touchUpInside)
break
case .finishAtCurrent:
finishAtCurrentButtonEventListener = EventListener()
finishAtCurrentButtonEventListener.eventFired = {
switch self.animator.state {
case .active:
print("在当前进度结束动画")
//仅进入停止状态
self.animator.stopAnimation(false)
//进入停止状态后调用，结束动画， 状态对应addCompletion的回调返回参数position
self.animator.finishAnimation(at:.current)
default:
print("当前状态无法执行结束动画操作")
break
}
}
finishAtCurrentButton.addTarget(finishAtCurrentButtonEventListener, action: #selector(EventListener.handleEvent), for: .touchUpInside)
break
}
}
}
修改TestPropertyAnimatorView
public class TestPropertyAnimatorView:UIView {
var controllerView:UIView!
var imageView:UIImageView!
var animator:UIViewPropertyAnimator!
override init(frame: CGRect) {
super.init(frame: frame)
initView()
initAnimator()
addController(animator: animator)
}
required public init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
//添加需要做动画的View
func initView() {
let image = UIImage(named: "growingup_108")
imageView = UIImageView(image: image)
imageView.frame = CGRect(x: 0, y: 0, width: 108, height: 108)
imageView.center = {
let x = (frame.minX + imageView.frame.width / 2)
let y = (frame.maxY - imageView.frame.height / 2)
return CGPoint(x: x, y: y)
}()
self.addSubview(imageView)
}
}
extension TestPropertyAnimatorView: ControllerBarAnimationProtocol {
public func initAnimator() {
animator = UIViewPropertyAnimator(duration: 5, curve: UIViewAnimationCurve.easeIn)
}
public func addController(animator:UIViewPropertyAnimator) {
controllerView = ControllerBar(frame: CGRect(x: 0, y: 0, width: frame.width, height: 100), animator: animator, delegate:self)
self.addSubview(controllerView)
}
//添加动画
public func initAnimations() {
print("initAnimations")
imageView.frame = CGRect(x: 0, y: 0, width: 108, height: 108)
self.imageView.transform = CGAffineTransform(scaleX: 1, y: 1)
imageView.center = {
let x = (frame.minX + imageView.frame.width / 2)
let y = (frame.maxY - imageView.frame.height / 2)
return CGPoint(x: x, y: y)
}()
animator.addAnimations {
self.imageView.center = liveView.center
}
animator.addAnimations {
self.imageView.transform = CGAffineTransform(scaleX: 2, y: 2)
}
animator.addCompletion {
position in
switch position {
case .end:
print("动画结束回调: 动画结束")
case .current:
print("动画结束回调: 动画在当前进度结束")
case .start:
print("动画结束回调: 动画回滚结束")
}
}
}
}
再试试在Playground中运行
//创建liveView
let liveView = TestPropertyAnimatorView(frame: CGRect(x: 0, y: 0, width: 500, height: 500))
//设置为当前展示的View
PlaygroundPage.current.liveView = liveView
liveView.initAnimations()
liveView.animator.startAnimation()
添加了动画控制器，再来看一下吧
查看UIViewPropertyAnimator playground demo源码
https://github.com/huhuegg/Demo/tree/master/Playground/UIViewPropertyAnimator%20Playground.playground