UIViewPropertyAnimator是iOS的新特性，通过UIViewPropertyAnimator你可以细粒度控制自己制作的动画，易于抹除、逆向、暂停和重启动画，并重构动画帧使之平滑流畅。这些功能也可以用于控制器的转场动画。
OC :
#import"ViewController.h"
@interfaceViewController()
@property(nonatomic) UIView *views;
@property(nonatomic) UIViewPropertyAnimator *animator;
@end
@implementationViewController
- (void)viewDidLoad {
[super viewDidLoad];
UIView *view = [[UIView alloc]initWithFrame:CGRectMake(100, 100, 100, 100)];
view.backgroundColor = [UIColor redColor];
[self.view addSubview:view];
self.views = view;
//初始化动画器 UIViewPropertyAnimator *animator = [[UIViewPropertyAnimator alloc]initWithDuration:4 curve:UIViewAnimationCurveLinear animations:^{
self.views.frame = CGRectMake(200, 200, 200, 200);
}];
//添加动画结束 [animator addCompletion:^(UIViewAnimatingPosition finalPosition) {
if(finalPosition == UIViewAnimatingPositionEnd){
self.views.frame = CGRectMake(100, 100, 100, 100);
}
}];
self.animator = animator;
}
- (IBAction)start:(UIButton *)sender {
[self.animator startAnimation];
}
- (IBAction)pause:(id)sender {
[self.animator pauseAnimation];
}
- (IBAction)continue:(id)sender {
//参数 dampingRatio,阻尼系数越小弹性越大(0-1) UISpringTimingParameters *params = [[UISpringTimingParameters alloc]initWithDampingRatio:0.6];
[self.animator continueAnimationWithTimingParameters:params durationFactor:1];
}
- (IBAction)stop:(id)sender {
[self.animator stopAnimation:false];
}
swift:
import UIKit
classViewController:UIViewController
{
var v:UIView!
var animator:UIViewPropertyAnimator!
override func viewDidLoad() {
super.viewDidLoad()
let v =UIView(frame:CGRect(x:100,y:100,width:100,height:100))
v.backgroundColor =UIColor.red
view.addSubview(v)
self.v = v
//初始化动画器
let animator =UIViewPropertyAnimator(duration: 4,curve:UIViewAnimationCurve.linear){ v.frame =CGRect(x:200,y:200,width:200,height:200)
}
animator.addCompletion {(UIViewAnimatingPosition)in v.frame =CGRect(x:100,y:100,width:100,height:100)
}
self.animator = animator
}
@IBActionfunc startAnimate(_sender:Any) {
self.animator.startAnimation()
}
@IBActionfunc pauseAnimate(_sender:Any) {
self.animator.pauseAnimation()
}
@IBActionfunc continueAnimate(_sender:Any) {
//参数 dampingRatio,阻尼系数越小弹性越大(0-1)
let param =UISpringTimingParameters(dampingRatio:0.1)
self.animator.continueAnimation(withTimingParameters:param,durationFactor: 1)
}
@IBActionfunc stopAnimate(_sender:Any) {
//是否要在动画执行完毕后再停止
self.animator.stopAnimation(false)
}
}
拖动放大图的demo：
import UIKit
class ViewController: UIViewController {
// 记录拖动时的圆形视图 center
var circleCenter: CGPoint!
// 我们将在拖拽响应事件上附加不同的动画
var circleAnimator: UIViewPropertyAnimator!
let animationDuration = 4.0 override func viewDidLoad() {
super.viewDidLoad()
// 添加可拖动视图
let circle = UIView(frame: CGRect(x: 0.0, y: 0.0, width: 100.0, height: 100.0))
circle.center = self.view.center circle.layer.cornerRadius = 50.0 circle.backgroundColor = UIColor.green // 添加拖动手势
circle.addGestureRecognizer(UIPanGestureRecognizer(target: self, action: #selector(self.dragCircle))) // 可选动画参数
circleAnimator = UIViewPropertyAnimator(duration: animationDuration, curve: .easeOut, animations: {
// 放大凉别
circle.transform = CGAffineTransform(scaleX: 2.0, y: 2.0)
})
self.view.addSubview(circle)
}
//拖动事件
func dragCircle(gesture: UIPanGestureRecognizer) {
let target = gesture.view!
//methond 1// switch gesture.state {
// case .began:
// circleCenter = target.center// case .changed:
// let translation = gesture.translation(in: self.view)
// target.center = CGPoint(x: circleCenter!.x + translation.x, y: circleCenter!.y + translation.y)
// //传入一个 0.0-1.0 的浮点数，使其在对应位置暂停
// circleAnimator?.fractionComplete = target.center.y / self.view.frame.height// default: break// }
//methond 2 switch gesture.state {
case .began, .ended:
circleCenter = target.center if circleAnimator.state == .active {
// 使animator为inactive状态
circleAnimator.stopAnimation(true)
}
if (gesture.state == .began) {
circleAnimator.addAnimations({
target.transform = CGAffineTransform(scaleX: 2.0, y: 2.0)
})
}
else {
circleAnimator.addAnimations({
target.transform = CGAffineTransform.identity })
}
circleAnimator.startAnimation()
case .changed:
let translation = gesture.translation(in: self.view)
target.center = CGPoint(x: circleCenter!.x + translation.x, y: circleCenter!.y + translation.y)
default: break }
}
}
效果图：
转载自：https://blog.csdn.net/zww1984774346/article/details/58089754
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