ios 购物车商品下落动画

属性: 

@property (nonatomic,
strong) NSMutableArray *animationLayers;

@property (nonatomic,
assign) BOOL isNeedNotification;

@property (nonatomic,
assign) BOOL isAnimating;

方法: 

- (void)addProductsAnimati
4000
on:(UIImageView *)imageView dropToPoint:(CGPoint)dropToPoint isNeedNotification:(BOOL)isNeedNotification
{

    

    

    

    //若正在做动画，就结束，防止连续点击

    if (self.isAnimating) {

        // return;

    }

    

    self.isAnimating =
YES;

    

    self.isNeedNotification = isNeedNotification;

    if (self.animationLayers ==
nil) {

        self.animationLayers = [[NSMutableArray
alloc] init];

    }

    

    CGRect frame = [imageView
convertRect:imageView.bounds
toView:APPDELEGATE.window];

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

    transitionLayer.frame = frame;

    transitionLayer.contents = imageView.layer.contents;

    [APPDELEGATE.window.layer
addSublayer:transitionLayer];

    [self.animationLayers
addObject:transitionLayer];

    

    CGPoint point1 = transitionLayer.position;

    

    CAKeyframeAnimation *positionAnimation = [CAKeyframeAnimation
animationWithKeyPath:@"position"];

    CGMutablePathRef path =
CGPathCreateMutable();

    CGPathMoveToPoint(path,
nil, point1.x, point1.y);

    CGPathAddCurveToPoint(path,
nil, point1.x, point1.y -
30, dropToPoint.x, point1.y -
30, dropToPoint.x, dropToPoint.y);

    positionAnimation.path = path;

    

    CABasicAnimation *opacityAnimation = [CABasicAnimation
animationWithKeyPath:@"opacity"];

    opacityAnimation.fromValue =
@1;

    opacityAnimation.toValue =
@0.9;

    

    CABasicAnimation *transformAnimation = [CABasicAnimation
animationWithKeyPath:@"transform"];

    transformAnimation.fromValue = [NSValue
valueWithCATransform3D:CATransform3DIdentity];

    transformAnimation.toValue = [NSValue
valueWithCATransform3D:CATransform3DScale(CATransform3DIdentity,
0.2,
0.2, 1)];

    

    CAAnimationGroup *groupAnimation = [CAAnimationGroup
animation];

    groupAnimation.animations =
@[positionAnimation, transformAnimation, opacityAnimation];

    groupAnimation.duration =
0.5;

    groupAnimation.delegate
= self;

    groupAnimation.fillMode =
kCAFillModeForwards;

    groupAnimation.removedOnCompletion =
YES;

    

    [transitionLayer addAnimation:groupAnimation
forKey:@"cartParabola"];

    

}

- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag {

    

    self.isAnimating =
NO;

    

    if (self.animationLayers.count
> 0) {

        CALayer *layer =
self.animationLayers[0];

        layer.hidden =
YES;

        [layer removeFromSuperlayer];

        [self.animationLayers
removeObjectAtIndex:0];

        [APPDELEGATE.window.layer
removeAnimationForKey:@"cartParabola"];

        if (self.isNeedNotification) {

            [[NSNotificationCenter
defaultCenter] postNotificationName:@"shopCarAnimationEnd"
object:nil];

        }

//        if (_addShopCarFinished) {

//            self.addShopCarFinished();

//        }

    }

}

调用:

   [self
addProductsAnimation:self.goodImage
dropToPoint:CGPointMake(Width *
0.625,
Height - 50)
isNeedNotification:YES];