//

 //  YFAttachmentBehaviorViewController.m

 //  BigShow1949

 //

 //  Created by apple on 16/8/25.

 //  Copyright © 2016年 BigShowCompany. All rights reserved.

 //

 #import "YFAttachmentBehaviorViewController.h"

 @interface YFAttachmentBehaviorViewController ()

 @property (nonatomic, strong) UIView *square1;

 @property(nonatomic,strong)UIDynamicAnimator *animator;

 @property (nonatomic, strong) UIAttachmentBehavior *attachmentBehavior;

 @end

 @implementation YFAttachmentBehaviorViewController

 - (void)viewDidLoad

 {

     [super viewDidLoad];

     self.view.backgroundColor = [UIColor whiteColor];

     // 创建一个正方形

     self.square1 =[[UIView alloc] initWithFrame: CGRectMake(0.0f, -, 80.0f, 80.0f)];

     self.square1.backgroundColor = [UIColor greenColor];

     self.square1.center = self.view.center;

     [self.view addSubview:self.square1];

     self.animator = [[UIDynamicAnimator alloc] initWithReferenceView:self.view];

     UICollisionBehavior* collision = [[UICollisionBehavior alloc] initWithItems:@[self.square1]];

     collision.translatesReferenceBoundsIntoBoundary = YES;

     UIGravityBehavior *gravity = [[UIGravityBehavior alloc] initWithItems:@[self.square1]];

     [self.animator addBehavior:collision];

     [self.animator addBehavior:gravity];

     // 视图手势

     [self createGestureRecognizer];

 }

 - (void)createGestureRecognizer{

     UIPanGestureRecognizer *tapGestureRecognizer =

     [[UIPanGestureRecognizer alloc] initWithTarget:self  action:@selector(handleTap:)];

     [self.view addGestureRecognizer:tapGestureRecognizer];

 }

 - (void)handleTap:(UIPanGestureRecognizer *)gesture{

     if (gesture.state == UIGestureRecognizerStateBegan){

         NSLog(@"----Began");

         CGPoint squareCenterPoint = CGPointMake(self.square1.center.x, self.square1.center.y - 100.0);

         UIAttachmentBehavior* attachmentBehavior = [[UIAttachmentBehavior alloc] initWithItem:self.square1 attachedToAnchor:squareCenterPoint];

         self.attachmentBehavior = attachmentBehavior;

         [self.animator addBehavior:attachmentBehavior];

     } else if ( gesture.state == UIGestureRecognizerStateChanged) {

         NSLog(@"----Changed");

         [self.attachmentBehavior setAnchorPoint:[gesture locationInView:self.view]];

     } else if (gesture.state == UIGestureRecognizerStateEnded) {

         NSLog(@"----Ended");

         [self.animator removeBehavior:self.attachmentBehavior];

     }

 }

 @end