使用 Facebook开源动画库 POP 实现真实衰减动画
1. POP动画基于底层刷新原理。是基于CADisplayLink,1秒钟运行60秒,接近于游戏开发引擎
@interface ViewController ()
@property (nonatomic,strong)CADisplayLink *displayLink;
@property (nonatomic) NSInteger count;
@end
- (void)viewDidLoad {
[superviewDidLoad];
self.displayLink = [CADisplayLinkdisplay LinkWithTarget:self
selector:@selector(displayLinkEvent:)];
[self performSelector:@selector(eventOne)
withObject:nil
afterDelay:];
[self performSelector:@selector(eventTwo)
withObject:nil
afterDelay:];
}
- (void)displayLinkEvent:(id)obj
{
self.count ++;
NSLog(@"count = %ld",(long)self.count);
}
- (void)eventOne{
[self.displayLink addToRunLoop:[NSRunLoopcurrentRunLoop]forMode:NSDefaultRunLoopMode];
}
- (void)eventTwo{
[self.displayLink invalidate];
}
二、POP动画引擎中 Layer与
CALayer的联系与差别
1.使用pop动画与使用CALayer动画很相似
2.POP动画的运行没有中间状态
3.POP动画是对CALayer的动画的扩充,但不能实现全部的CALayer的动画效果
4.POP动画能够作用在不论什么对象上,不不过CALayer
- (void)accessNormalLayer{
self.normalLayer = [CALayerlayer];
,,,);
self.normalLayer.backgroundColor = [UIColorredColor].CGColor;
[self.view.layeraddSublayer:self.normalLayer];
//
CABasicAnimation *basicAnimation = [CABasicAnimation animationWithKeyPath:@"position"];
basicAnimation.fromValue = [NSValue valueWithCGPoint:self.normalLayer.position];
basicAnimation.toValue = [NSValue valueWithCGPoint:CGPointMake( +,)];
basicAnimation.duration = 4.0;
basicAnimation.timingFunction = \
[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];
// layer的postion相当于view的center
+,);
[self.normalLayer addAnimation:basicAnimationforKey:nil];
//1.4秒移除后,动画直接到终点
[self performSelector:@selector(remoVeNormalAnimation)withObject:nilafterDelay:1.4];
}
- (void)remoVeNormalAnimation{
CALayer *layer = self.normalLayer.presentationLayer;
NSLog(@"%@",NSStringFromCGRect(layer.frame));
NSLog(@"%@",NSStringFromCGRect(self.normalLayer.frame));
[self.normalLayer removeAllAnimations];
}
三、用 POP动画引擎实现衰减动画
1.衰减动画由POPDecayAnimaiton来实现
2.须要精确计算停止运动瞬间的加速度才干用衰减动画做出真实的效果
- (void)handlePanGesture:(UIPanGestureRecognizer *)recognizer{
//获取定位点
CGPoint translation = [recognizer translationInView:self.view];
//recognizer.view.center
指的是button
recognizer.view.center =CGPointMake(recognizer.view.center.x + translation.x,
recognizer.view.center.y +translation.y);
//让他恢复坐标系
[recognizer setTranslation:CGPointMake(,)inView:self.view];
if (recognizer.state ==UIGestureRecognizerStateChanged) {
NSLog(@"手势停止时运行这一句话");
//获取加速度
CGPoint velocity = [recognizer velocityInView:self.view];
//初始化POP的deacy(衰减)动画
POPDecayAnimaton *decayAnimation = \
[POPDecayAnimation animationWithPropertyName:kPOPLayerPosition];
decayAnimation.velocity = [NSValue valueWithCGPoint:velocity];
[recognizer.view.layer pop_addAnimation:decayAnimation forKey:nil];
}
}
- (void)buttonEvent:(UIButton *)button
{
//[button.layer pop_removeAllAnimations];
}
- (void)viewDidLoad {
[superviewDidLoad];
,,,)];
self.button .backgroundColor = [UIColorredColor];
;
self.button.layer.masksToBounds =YES;
self.button.center =self.view.center;
[self.viewaddSubview:self.button];
[self.buttonaddTarget:self
action:@selector(buttonEvent:)
forControlEvents:UIControlEventTouchDragInside];
UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizeralloc]initWithTarget:selfaction:@selector(handlePanGesture:)];
[self.buttonaddGestureRecognizer:panGesture];
}
Facebook官方的pop动画:附链接https://github.com/schneiderandre/popping
最新文章
- Shiro安全框架入门篇(登录验证实例详解与源码)
- Mongodb Manual阅读笔记:CH2 Mongodb CRUD 操作
- 织梦DEDECMS网站后台安全检测提示 加一个开关
- C#基础总结之二循环控制-运算符
- CentOS 7.2 安装教程
- 什么是Ajax无刷新技术?
- HDU 1707
- org.springframework.orm.jpa.JpaTransactionManager
- linux下查找文件和文件内容
- noip2014总结
- 介绍 - OC中的代理模式
- 自制刻度尺-前端简易实现";腾讯信用";界面
- Python 妙用heapq
- 知识科普:IM聊天应用是如何将消息发送给对方的?(非技术篇)
- 23 python初学(模块和包)
- qemu中的内存管理
- 关于Spring的Quartz定时器设定
- swift 警告框 - 自定义按钮颜色,图片
- SparkStreaming实时日志分析--实时热搜词
- decay
热门文章
- [BZOJ1858] [SCOI2010] 序列操作 解题报告 (线段树)
- Asp.Net中使用水晶报表(中)
- 200 from memory cache / from disk cache / 304 Not Modified 区别
- 鼠标点击textarea后,在光标后追加内容
- appium使用教程(二)-------------连接手机
- 移动和PC的适配
- LightOJ-1341 Aladdin and the Flying Carpet 分解质因数(注意对大素数的优化)
- NET Core微服务之路:实战SkyWalking+Exceptionless体验生产下追踪系统
- 【Henu ACM Round#17 F】Upgrading Array
- Java基础学习总结(27)——7 款开源 Java 反编译工具