【iOS】UIDynamicAnimator動畫，uidynamicanimator

【iOS】UIDynamicAnimator動畫，uidynamicanimator

建立動畫

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

協議代理

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

屬性

1 // 行為執行時間2 @property (nonatomic, readonly) NSTimeInterval elapsedTime;3 // 判斷是否正在執行4 @property (nonatomic, readonly, getter = isRunning) BOOL running;

設定動畫組件Item的動力屬性

UIDynamicItemBehavior

 1 UIDynamicItemBehavior *dynamic = [[UIDynamicItemBehavior alloc] init]; 2 [animator addBehavior:dynamic]; 3 [dynamic addItem:view]; 4  5 // 相關屬性 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

為動畫組件添加具體行為

吸引行為 UISnapBehavior

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

重力行為 UIGravityBehavior

1 UIGravityBehavior *gravity = [[UIGravityBehavior alloc] init];2 // 重力向量方向 預設為 (0,1)3 gravity.gravityDirection = CGVectorMake(0, 1);4 // 重力大小5 gravity.magnitude = 5;6 [animator addBehavior:gravity];7 [gravity addItem:view];

碰撞行為 UICollisionBehavior

1 UICollisionBehavior *collision = [[UICollisionBehavior alloc] init];2 // 邊界剛體碰撞3 collision.translatesReferenceBoundsIntoBoundary = YES;4 [animator addBehavior:collision];5 [collision addItem:view];

作用力行為 UIPushBehavior

1 UIPushBehavior *push = [[UIPushBehavior alloc] initWithItems:@[view]2                                                         mode:UIPushBehaviorModeInstantaneous];3 //    UIPushBehaviorModeContinuous 持續作用力4 //    UIPushBehaviorModeInstantaneous 瞬間作用力5 push.active = YES;6 push.pushDirection = CGVectorMake(1, 0);7 [animator addBehavior:push];

效果示範

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;// 彈力係數10     [animator addBehavior:dynamic];11     12     gravity = [[UIGravityBehavior alloc]init];13     gravity.gravityDirection = CGVectorMake(0, 1);// 重力向量方向14     [animator addBehavior:gravity];15     16     collision = [[UICollisionBehavior alloc]init];17     collision.translatesReferenceBoundsIntoBoundary = YES;// 邊界剛體碰撞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;// 彈力係數10     [animator addBehavior:dynamic];11     12     collision = [[UICollisionBehavior alloc]init];13     collision.translatesReferenceBoundsIntoBoundary = YES;// 邊界剛體碰撞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     UITapGestureRecognizer *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)), dispatch_get_main_queue(), ^{52         [animator removeBehavior:snap];53     });54 }