UIDynamic-adhesion behavior: UIAttachmentBehavior,

UIDynamic-adhesion behavior: UIAttachmentBehavior,

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1 // 2 // YFAttachmentBehaviorViewController. m 3 // BigShow1949 4 // 5 // Created by apple on 16/8/25. 6 // Copyright©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 * animation or; 15 @ property (nonatomic, strong) UIAttachmentBehavior * attachmentBehavior; 16 17 18 19 @ end20 21 @ implementation YFAttachmentBehaviorViewController22 23-(void) viewDidLoad24 {25 [super viewDidLoad]; 26 self. view. backgroundColor = [UIColor whiteColor]; 28 29 // create a square 30 self. square1 = [[UIView alloc] initWithFrame: CGRectMake (0.0f, 568-80, 80366f, 80366f)]; 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. translatesreferencebounds=boundary = 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 // view gesture 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