iOS仿美團購物車效果

@protocol ThrowLineToolDelegate;

@interface ThrowLineTool : NSObject

@property (nonatomic, assign) id<ThrowLineToolDelegate>delegate;
@property (nonatomic, retain) UIView *showingView;

+ (ThrowLineTool *)sharedTool;

/**
 *  將某個view或者layer從起點拋到終點
 *
 *  @param obj    被拋的物體
 *  @param start  起點坐標
 *  @param end    終點坐標
 *  @param height 高度，拋物線最高點比起點/終點y坐標最低(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>

/**
 *  拋物線結束的回調
 */
- (void)animationDidFinish;

@end

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