关键帧动画

CALayer *transitionLayer = [[CALayer alloc] init];

 //开启一个动画事务
    [CATransaction begin];
    
    //CATransaction 事务类,可以对多个layer的属性同时进行修改.它分隐式事务,和显式事务.kCATransactionDisableActions
    [CATransaction setValue:(id)kCFBooleanTrue forKey:kCATransactionDisableActions];
    transitionLayer.opacity = 0.6;
    //contents是layer的一个属性
    
    UIImageView *tempimgview;
    for (UIView *aView in [picView subviews]) // picView代表需要执行动画的视图
    {
        if([aView isKindOfClass:[UIImageView class]]){
            //NSLog(@"=====找到imageview");
            tempimgview = (UIImageView*)aView;
            break;
        }
        
    }
//设置CALayer的内容
transitionLayer.contents = (id)tempimgview.layer.contents;

//父类不同,所以需要坐标系统的转换，必须是处于同一window内
    transitionLayer.frame = [[UIApplication sharedApplication].keyWindow convertRect:tempimgview.bounds fromView:tempimgview];
    
    [[UIApplication sharedApplication].keyWindow.layer addSublayer:transitionLayer];
   
    [UIView beginAnimations:@"imageViewAnimation" context:(__bridge void *)(tempimgview)];
/// 提交事务
    [CATransaction commit];

//路径曲线:贝塞尔曲线，使动画按照你所设定的贝塞尔曲线运动
    UIBezierPath *movePath = [UIBezierPath bezierPath];
    [movePath moveToPoint:transitionLayer.position];
    
    //传入购物车的坐标(X,Y)
    CGPoint toPoint = CGPointMake(self.view.frame.size.width-20, 40);
    //
    [movePath addQuadCurveToPoint:toPoint
                     controlPoint:CGPointMake(self.view.frame.size.width-50,transitionLayer.position.y-50)];
    
    
    //关键帧
    CAKeyframeAnimation *positionAnimation = [CAKeyframeAnimation animationWithKeyPath:@"position"];
    positionAnimation.path = movePath.CGPath;
    positionAnimation.removedOnCompletion = YES;
    
   
    
    //缩小动画
    CABasicAnimation *scaleAnim = [CABasicAnimation animationWithKeyPath:@"transform"];
    scaleAnim.fromValue = [NSValue valueWithCATransform3D:CATransform3DIdentity];
    scaleAnim.toValue = [NSValue valueWithCATransform3D:CATransform3DMakeScale(0.1, 0.1, 1.0)];
    //缩小动画结束移除
    scaleAnim.removedOnCompletion = YES;
    NSLog(@"=====in enjoy55555");
    
    //将抛物动画和缩小动画加入动画组，可以执行多个动画，并且设置动画的执行时间
    CAAnimationGroup *group = [CAAnimationGroup animation];
    group.beginTime = CACurrentMediaTime();
    group.duration = 0.7;
    group.animations = [NSArray arrayWithObjects:positionAnimation,scaleAnim,nil];
    group.timingFunction=[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut];
    //group.fillMode = kCAFillModeForwards;
    group.removedOnCompletion = YES;
    group.autoreverses= NO;
    group.delegate=self;
    [transitionLayer addAnimation:group forKey:@"opacity"];

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