实现购物车动画

//加入购物车 步骤1
- (void)addToShopCar:(UIButton *)bt
{
    //得到产品信息
    UITableViewCell *cell = (UITableViewCell *)[bt superview];
    NSIndexPath *indexPath = [mainTable indexPathForCell:cell];
    NSDictionary *dic = [dataList objectAtIndex:indexPath.row];
    addPrice = [[dic valueForKey:@"price"]intValue];
    
    UIButton *shopCarBt = (UIButton*)[self.view viewWithTag:44];
    
    //加入购物车动画效果
    CALayer *transitionLayer = [[CALayer alloc] init];
    [CATransaction begin];
    [CATransaction setValue:(id)kCFBooleanTrue forKey:kCATransactionDisableActions];
    transitionLayer.opacity = 1.0;
    transitionLayer.contents = (id)bt.titleLabel.layer.contents;
    transitionLayer.frame = [[UIApplication sharedApplication].keyWindow convertRect:bt.titleLabel.bounds fromView:bt.titleLabel];
    [[UIApplication sharedApplication].keyWindow.layer addSublayer:transitionLayer];
    [CATransaction commit];
    
    //路径曲线
    UIBezierPath *movePath = [UIBezierPath bezierPath];
    [movePath moveToPoint:transitionLayer.position];
    CGPoint toPoint = CGPointMake(shopCarBt.center.x, shopCarBt.center.y+60);
    [movePath addQuadCurveToPoint:toPoint
                     controlPoint:CGPointMake(shopCarBt.center.x,transitionLayer.position.y-120)];
    //关键帧
    CAKeyframeAnimation *positionAnimation = [CAKeyframeAnimation animationWithKeyPath:@"position"];
    positionAnimation.path = movePath.CGPath;
    positionAnimation.removedOnCompletion = YES;
    
    CAAnimationGroup *group = [CAAnimationGroup animation];
    group.beginTime = CACurrentMediaTime();
    group.duration = 0.7;
    group.animations = [NSArray arrayWithObjects:positionAnimation,nil];
    group.timingFunction=[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut];
    group.delegate = self;
    group.fillMode = kCAFillModeForwards;
    group.removedOnCompletion = NO;
    group.autoreverses= NO;
    
    [transitionLayer addAnimation:group forKey:@"opacity"];
    [self performSelector:@selector(addShopFinished:) withObject:transitionLayer afterDelay:0.5f];
}
//加入购物车 步骤2
- (void)addShopFinished:(CALayer*)transitionLayer
{
    [mainTable reloadData];
    transitionLayer.opacity = 0;
    UIButton *shopCarBt = (UIButton*)[self.view viewWithTag:55];
    if (shopCarBt.hidden) {
        NSString *str = [NSString stringWithFormat:@"￥%i",addPrice];
        [shopCarBt setTitle:str forState:UIControlStateNormal];
        [shopCarBt setHidden:NO];
    } else{
        allPrice = allPrice + addPrice;
        NSString *str = [NSString stringWithFormat:@"￥%i",allPrice];
        [shopCarBt setTitle:str forState:UIControlStateNormal];
        
        //加入购物车动画效果
        UILabel *addLabel = (UILabel*)[self.view viewWithTag:66];
        [addLabel setText:[NSString stringWithFormat:@"+%i",addPrice]];
        
        CALayer *transitionLayer1 = [[CALayer alloc] init];
        [CATransaction begin];
        [CATransaction setValue:(id)kCFBooleanTrue forKey:kCATransactionDisableActions];
        transitionLayer1.opacity = 1.0;
        transitionLayer1.contents = (id)addLabel.layer.contents;
        transitionLayer1.frame = [[UIApplication sharedApplication].keyWindow convertRect:addLabel.bounds fromView:addLabel];
        [[UIApplication sharedApplication].keyWindow.layer addSublayer:transitionLayer1];
        [CATransaction commit];
        
        CABasicAnimation *positionAnimation = [CABasicAnimation animationWithKeyPath:@"position"];
        positionAnimation.fromValue = [NSValue valueWithCGPoint:CGPointMake(addLabel.frame.origin.x+30, addLabel.frame.origin.y+20)];
        positionAnimation.toValue = [NSValue valueWithCGPoint:CGPointMake(addLabel.frame.origin.x+30, addLabel.frame.origin.y)];
        
        CABasicAnimation *opacityAnimation = [CABasicAnimation animationWithKeyPath:@"opacity"];
        opacityAnimation.fromValue = [NSNumber numberWithFloat:1.0];
        opacityAnimation.toValue = [NSNumber numberWithFloat:0];
        
        CABasicAnimation *rotateAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.y"];
        rotateAnimation.fromValue = [NSNumber numberWithFloat:0 * M_PI];
        rotateAnimation.toValue = [NSNumber numberWithFloat:2 * M_PI];
        
        CAAnimationGroup *group = [CAAnimationGroup animation];
        group.beginTime = CACurrentMediaTime();
        group.duration = 0.3;
        group.animations = [NSArray arrayWithObjects:positionAnimation,opacityAnimation,nil];
        group.timingFunction=[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
        group.delegate = self;
        group.fillMode = kCAFillModeForwards;
        group.removedOnCompletion = NO;
        group.autoreverses= NO;
        [transitionLayer1 addAnimation:group forKey:@"opacity"];
    }
}