UIDynamic-附著行為:UIAttachmentBehavior，

UIDynamic-附著行為:UIAttachmentBehavior，

直接上代碼:

 1 // 2 //  YFAttachmentBehaviorViewController.m 3 //  BigShow1949 4 // 5 //  Created by apple on 16/8/25. 6 //  Copyright © 2016年 BigShowCompany. All rights reserved. 7 // 8  9 #import "YFAttachmentBehaviorViewController.h"10 11 @interface YFAttachmentBehaviorViewController ()12 13 @property (nonatomic, strong) UIView *square1;14 @property(nonatomic,strong)UIDynamicAnimator *animator;15 @property (nonatomic, strong) UIAttachmentBehavior *attachmentBehavior;16 17 18 19 @end20 21 @implementation YFAttachmentBehaviorViewController22 23 - (void)viewDidLoad24 {25     [super viewDidLoad];26     27     self.view.backgroundColor = [UIColor whiteColor];28     29     // 建立一個正方形30     self.square1 =[[UIView alloc] initWithFrame: CGRectMake(0.0f, 568-80, 80.0f, 80.0f)];31     self.square1.backgroundColor = [UIColor greenColor];32     self.square1.center = self.view.center;33     [self.view addSubview:self.square1];34     35     36     self.animator = [[UIDynamicAnimator alloc] initWithReferenceView:self.view];37 38     UICollisionBehavior* collision = [[UICollisionBehavior alloc] initWithItems:@[self.square1]];39     collision.translatesReferenceBoundsIntoBoundary = YES;40     41     UIGravityBehavior *gravity = [[UIGravityBehavior alloc] initWithItems:@[self.square1]];42     43     44     [self.animator addBehavior:collision];45     [self.animator addBehavior:gravity];46     47     48     // 視圖手勢49     [self createGestureRecognizer];50 }51 52 53 - (void)createGestureRecognizer{54     UIPanGestureRecognizer *tapGestureRecognizer =55     [[UIPanGestureRecognizer alloc] initWithTarget:self  action:@selector(handleTap:)];56     [self.view addGestureRecognizer:tapGestureRecognizer];57 }58 59 - (void)handleTap:(UIPanGestureRecognizer *)gesture{60     61     if (gesture.state == UIGestureRecognizerStateBegan){62         NSLog(@"----Began");63         64         CGPoint squareCenterPoint = CGPointMake(self.square1.center.x, self.square1.center.y - 100.0);65         66         UIAttachmentBehavior* attachmentBehavior = [[UIAttachmentBehavior alloc] initWithItem:self.square1 attachedToAnchor:squareCenterPoint];67         68         self.attachmentBehavior = attachmentBehavior;69         [self.animator addBehavior:attachmentBehavior];70         71     } else if ( gesture.state == UIGestureRecognizerStateChanged) {72         NSLog(@"----Changed");73         [self.attachmentBehavior setAnchorPoint:[gesture locationInView:self.view]];74         75     } else if (gesture.state == UIGestureRecognizerStateEnded) {76         NSLog(@"----Ended");77         [self.animator removeBehavior:self.attachmentBehavior];78     }79 }80 81 82 83 @end