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 @end
20 
21 @implementation YFAttachmentBehaviorViewController
22 
23 - (void)viewDidLoad
24 {
25     [super viewDidLoad];
26     
27     self.view.backgroundColor = [UIColor whiteColor];
28     
29     // 創建一個正方形
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