加入购物车的粒子动画

   <p style="text-align: center;"><img src="https://simg.open-open.com/show/b2cc72342d172af43f502da7a5c06685.gif"></p>    <h3><strong>调用方式为直接调用CALayer的静态方法</strong></h3>    <p>[CALayer startAnimatAtBeginView:btn endView:weakself.cartView finished:nil];</p>    <pre>  <code class="language-objectivec">/**   *  加入购物车的粒子动画   *   *  @param begiView 开始地方的View   *  @param endView  结束地方的View   *  @param finished 动画结束回调   */  + (void)startAnimatAtBeginView:(UIView *)begiView                         endView:(UIView *)endView                        finished:(void(^)(void))finished;</code></pre>    <h3><strong>内部实现</strong></h3>    <pre>  <code class="language-objectivec">+ (void)startAnimatAtBeginView:(UIView *)begiView endView:(UIView *)endView finished:(void(^)(void))finished  {        UIWindow *window = [UIApplication sharedApplication].keyWindow;        //获取动画起始点和结束点      CGPoint startPoint = [begiView convertRect: begiView.bounds toView:window].origin;      CGPoint endPoint = [endView convertRect: endView.bounds toView:window].origin;      endPoint.x = endPoint.x + endView.bounds.size.width*0.5;      endPoint.y = endPoint.y + endView.bounds.size.height*0.5;        //设置粒子      CALayer *dotLayer = [CALayer layer];      dotLayer.backgroundColor = [UIColor redColor].CGColor;      dotLayer.frame = CGRectMake(0, 0, 15, 15);      dotLayer.cornerRadius = 15 /2;      [window.layer addSublayer:dotLayer];        dotLayer.endView = endView;      dotLayer.finished = finished;        //设置贝塞尔曲线      UIBezierPath *path= [UIBezierPath bezierPath];      [path moveToPoint:startPoint];      //三点曲线,设置路径      [path addCurveToPoint:endPoint              controlPoint1:startPoint              controlPoint2:CGPointMake(startPoint.x - 180, startPoint.y - 150)];          //设置动画组      CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"position"];      animation.path = path.CGPath;      animation.rotationMode = kCAAnimationRotateAuto;        CABasicAnimation *alphaAnimation = [CABasicAnimation animationWithKeyPath:@"alpha"];      alphaAnimation.duration = 0.1f;      alphaAnimation.fromValue = [NSNumber numberWithFloat:1.0];      alphaAnimation.toValue = [NSNumber numberWithFloat:0.1];      alphaAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut];        CAAnimationGroup *groups = [CAAnimationGroup animation];      groups.animations = @[animation,alphaAnimation];      groups.duration = 0.5f;      groups.removedOnCompletion = NO;      groups.fillMode = kCAFillModeForwards;      groups.delegate = dotLayer;      [groups setValue:@"groupsAnimation" forKey:@"animationName"];      [dotLayer addAnimation:groups forKey:nil];  }</code></pre>    <h3><strong>粒子动画结束</strong></h3>    <pre>  <code class="language-objectivec">- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag  {      if ([[anim valueForKey:@"animationName"]isEqualToString:@"groupsAnimation"]) {          !self.finished? :self.finished();            CABasicAnimation *shakeAnimation = [CABasicAnimation animationWithKeyPath:@"transform.scale"];          shakeAnimation.duration = 0.1f;          shakeAnimation.fromValue = [NSNumber numberWithFloat:0.7];          shakeAnimation.toValue = [NSNumber numberWithFloat:1];          shakeAnimation.autoreverses = YES;          [self.endView.layer addAnimation:shakeAnimation forKey:nil];            [self removeFromSuperlayer];      }  }</code></pre>    <p> </p>    <p>来自：http://www.jianshu.com/p/a726ae8526fc</p>    <p> </p>