iOS仿美团购物车效果

@protocol ThrowLineToolDelegate;    @interface ThrowLineTool : NSObject    @property (nonatomic, assign) id<ThrowLineToolDelegate>delegate;  @property (nonatomic, retain) UIView *showingView;    + (ThrowLineTool *)sharedTool;    /**   *  将某个view或者layer从起点抛到终点   *   *  @param obj    被抛的物体   *  @param start  起点坐标   *  @param end    终点坐标   *  @param height 高度，抛物线最高点比起点/终点y坐标最低(即高度最高)所超出的高度   */  - (void)throwObject:(UIView *)obj from:(CGPoint)start to:(CGPoint)end               height:(CGFloat)height duration:(CGFloat)duration;    @end      @protocol ThrowLineToolDelegate <NSObject>    /**   *  抛物线结束的回调   */  - (void)animationDidFinish;    @end

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