[IOS] UIDynamicAnimator animation, uidynamicanimator

[IOS] UIDynamicAnimator animation, uidynamicanimator

Create an animation

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

Protocol proxy

1 @protocol UIDynamicAnimatorDelegate <NSObject>2 3 @optional4 - (void)dynamicAnimatorWillResume:(UIDynamicAnimator *)animator;5 - (void)dynamicAnimatorDidPause:(UIDynamicAnimator *)animator;6 7 @end

Attribute

1 // behavior execution time 2 @ property (nonatomic, readonly) NSTimeInterval elapsedTime; 3 // determine whether execution is in progress 4 @ property (nonatomic, readonly, getter = isRunning) BOOL running;

Set the dynamic attributes of an animation component Item

UIDynamicItemBehavior

1 UIDynamicItemBehavior * dynamic = [[UIDynamicItemBehavior alloc] init]; 2 [animator addBehavior: dynamic]; 3 [dynamic addItem: view]; 4 5 // related attributes 6 @ property (readwrite, nonatomic) CGFloat elasticity; // Usually between 0 (inelastic) and 1 (collide elastically) 7 @ property (readwrite, nonatomic) CGFloat friction; // 0 being no friction between objects slide along each other 8 @ property (readwrite, nonatomic) CGFloat density; // 1 by default 9 @ property (readwrite, nonatomic) CGFloat resistance; // 0: no velocity damping10 @ property (readwrite, nonatomic) CGFloat angularResistance; // 0: no angular velocity damping

Add specific actions to an animation component

Attracting behavior UISnapBehavior

1 UISnapBehavior * snap = [[UISnapBehavior alloc] 2 initWithItem: view3 snapToPoint: CGPointMake (200,300)]; 4 snap. damping = 0.9; // damping Factor 5 [animator addBehavior: snap];

Gravity behavior UIGravityBehavior

1 UIGravityBehavior * gravity = [[UIGravityBehavior alloc] init]; 2 // The default direction of gravity Vector is () 3 gravity. gravityDirection = CGVectorMake (0, 1); 4 // gravity size 5 gravity. magnworkflow = 5; 6 [animator addBehavior: gravity]; 7 [gravity addItem: view];

Collision behavior UICollisionBehavior

1 UICollisionBehavior * collision = [[UICollisionBehavior alloc] init]; 2 // border rigid body collision 3 collision. translatesreferencebounds=boundary = YES; 4 [animator addBehavior: collision]; 5 [collision addItem: view];

Force behavior UIPushBehavior

1 UIPushBehavior * push = [[UIPushBehavior alloc] initWithItems: @ [view] 2 mode: Unknown]; 3 // UIPushBehaviorModeContinuous sustained force 4 // Instant force 5 push. active = YES; 6 push. pushDirection = CGVectorMake (1, 0); 7 [animator addBehavior: push];

Effect demonstration

UIDynamicItemBehavior + UIGravityBehavior + UICollisionBehavior

1-(void) viewDidLoad 2 {3 [super viewDidLoad]; 4 // Do any additional setup after loading the view, typically from a nib. 5 6 animator = [[UIDynamicAnimator alloc] initWithReferenceView: self. view]; 7 8 dynamic = [[UIDynamicItemBehavior alloc] init]; 9 dynamic. elasticity = 0.7; // elasticity coefficient 10 [animator addBehavior: dynamic]; 11 12 gravity = [[UIGravityBehavior alloc] init]; 13 gravity. gravityDirection = CGVectorMake (0, 1); // gravity vector direction 14 [animator addBehavior: gravity]; 15 16 collision = [[UICollisionBehavior alloc] init]; 17 collision. translatesReferenceBoundsIntoBoundary = YES; // boundary collision 18 [animator addBehavior: collision]; 19} 20 21-(void) touchesBegan :( NSSet *) touches withEvent :( UIEvent *) event22 {23 CGFloat width = self. view. frame. size. width; 24 25 int x = arc4random () % (int) width; 26 int z = arc4random () % 20; 27 28 UIView * view = [[UIView alloc] initWithFrame: CGRectMake (x, 10, 20 + z, 20 + z)]; 29 view. backgroundColor = [UIColor greenColor]; 30 view. layer. borderColor = [UIColor blueColor]. CGColor; 31 view. layer. borderWidth = 1.0; 32 view. layer. masksToBounds = YES; 33 [self. view addSubview: view]; 34 35 36 [dynamic addItem: view]; 37 [gravity addItem: view]; 38 [collision addItem: view]; 39}

UIPushBehavior + UIGravityBehavior

 1 - (void)viewDidLoad 2 { 3     [super viewDidLoad]; 4     // Do any additional setup after loading the view, typically from a nib. 5      6     animator = [[UIDynamicAnimator alloc] initWithReferenceView:self.view]; 7      8     UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tap:)]; 9     [self.view addGestureRecognizer:tap];10     11     gravity = [[UIGravityBehavior alloc] init];12     gravity.gravityDirection = CGVectorMake(0, 1);13     gravity.magnitude = 10.0;14     [animator addBehavior:gravity];15 }16 17 - (void)tap:(UITapGestureRecognizer *)tap18 {19     CGPoint point = [tap locationInView:self.view];20     21     for (CGFloat i = 0 ; i < M_PI*2; i = i + 0.2)22     {23         UIView *view = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 10, 10)];24         view.center = point;25         view.backgroundColor = [UIColor blueColor];26         view.layer.cornerRadius = 5;27         view.layer.masksToBounds = YES;28         [self.view addSubview:view];29         30         UIPushBehavior *push = [[UIPushBehavior alloc] initWithItems:@[view]31                                                                 mode:UIPushBehaviorModeInstantaneous];32         push.active = YES;33         push.angle = i;34         push.magnitude = 0.05;35         [animator addBehavior:push];36         37         [gravity addItem:view];38     }39 }

 

UIDynamicItemBehavior + UICollisionBehavior + UISnapBehavior

1-(void) viewDidLoad 2 {3 [super viewDidLoad]; 4 // Do any additional setup after loading the view, typically from a nib. 5 6 animator = [[UIDynamicAnimator alloc] initWithReferenceView: self. view]; 7 8 dynamic = [[UIDynamicItemBehavior alloc] init]; 9 dynamic. elasticity = 0.7; // elasticity coefficient 10 [animator addBehavior: dynamic]; 11 12 collision = [[UICollisionBehavior alloc] init]; 13 collision. translatesReferenceBoundsIntoBoundary = YES; // boundary collision 14 [animator addBehavior: collision]; 15 16 CGFloat width = self. view. frame. size. width; 17 CGFloat height = self. view. frame. size. height; 18 19 red = [[UIView alloc] initWithFrame: CGRectMake (0, 0, 30, 30)]; 20 red. center = CGPointMake (width/2, height/2 + 100); 21 red. backgroundColor = [UIColor redColor]; 22 red. layer. cornerRadius = 15.0; 23 red. layer. masksToBounds = YES; 24 [self. view addSubview: red]; 25 26 [collision addItem: red]; 27 28 minutes * tap = [[UITapGestureRecognizer alloc] initWithTarget: self action: @ selector (tap :)]; 29 [self. view addGestureRecognizer: tap]; 30} 31 32-(void) tap :( UITapGestureRecognizer *) tap33 {34 CGPoint point = [tap locationInView: self. view]; 35 36 UIView * view = [[UIView alloc] initWithFrame: CGRectMake (0, 0, 20, 20)]; 37 view. center = point; 38 view. backgroundColor = [UIColor blueColor]; 39 view. layer. cornerRadius = 10.0; 40 view. layer. masksToBounds = YES; 41 [self. view addSubview: view]; 42 43 [collision addItem: view]; 44 45 UISnapBehavior * snap = [[UISnapBehavior alloc] 46 initWithItem: view47 snapToPoint: red. center]; 48 snap. damping = 0.1; 49 [animator addBehavior: snap]; 50 51 dispatch_after (dispatch_time (DISPATCH_TIME_NOW, (int64_t) (1.0 * NSEC_PER_SEC), merge (), ^ {52 [animator removeBehavior: snap]; 53}); 54}