[iOS]UIDynamicAnimator动画
创建动画
UIDynamicAnimator *animator = [[UIDynamicAnimator alloc] initWithReferenceView:self.view];
协议代理
@protocol UIDynamicAnimatorDelegate <NSObject> @optional
- (void)dynamicAnimatorWillResume:(UIDynamicAnimator *)animator;
- (void)dynamicAnimatorDidPause:(UIDynamicAnimator *)animator; @end
属性
// 行为执行时间
@property (nonatomic, readonly) NSTimeInterval elapsedTime;
// 判断是否正在执行
@property (nonatomic, readonly, getter = isRunning) BOOL running;
设置动画组件Item的动力属性
UIDynamicItemBehavior
UIDynamicItemBehavior *dynamic = [[UIDynamicItemBehavior alloc] init];
[animator addBehavior:dynamic];
[dynamic addItem:view]; // 相关属性
@property (readwrite, nonatomic) CGFloat elasticity; // Usually between 0 (inelastic) and 1 (collide elastically)
@property (readwrite, nonatomic) CGFloat friction; // 0 being no friction between objects slide along each other
@property (readwrite, nonatomic) CGFloat density; // 1 by default
@property (readwrite, nonatomic) CGFloat resistance; // 0: no velocity damping
@property (readwrite, nonatomic) CGFloat angularResistance; // 0: no angular velocity damping
为动画组件添加具体行为
吸引行为 UISnapBehavior
UISnapBehavior *snap = [[UISnapBehavior alloc]
initWithItem:view
snapToPoint:CGPointMake(, )];
snap.damping = 0.9;//阻尼系数
[animator addBehavior:snap];
重力行为 UIGravityBehavior
UIGravityBehavior *gravity = [[UIGravityBehavior alloc] init];
// 重力矢量方向 默认为 (0,1)
gravity.gravityDirection = CGVectorMake(, );
// 重力大小
gravity.magnitude = ;
[animator addBehavior:gravity];
[gravity addItem:view];
碰撞行为 UICollisionBehavior
UICollisionBehavior *collision = [[UICollisionBehavior alloc] init];
// 边界刚体碰撞
collision.translatesReferenceBoundsIntoBoundary = YES;
[animator addBehavior:collision];
[collision addItem:view];
作用力行为 UIPushBehavior
UIPushBehavior *push = [[UIPushBehavior alloc] initWithItems:@[view]
mode:UIPushBehaviorModeInstantaneous];
// UIPushBehaviorModeContinuous 持续作用力
// UIPushBehaviorModeInstantaneous 瞬间作用力
push.active = YES;
push.pushDirection = CGVectorMake(, );
[animator addBehavior:push];
效果演示
UIDynamicItemBehavior+UIGravityBehavior+UICollisionBehavior
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib. animator = [[UIDynamicAnimator alloc] initWithReferenceView:self.view]; dynamic = [[UIDynamicItemBehavior alloc]init];
dynamic.elasticity = 0.7;// 弹力系数
[animator addBehavior:dynamic]; gravity = [[UIGravityBehavior alloc]init];
gravity.gravityDirection = CGVectorMake(, );// 重力矢量方向
[animator addBehavior:gravity]; collision = [[UICollisionBehavior alloc]init];
collision.translatesReferenceBoundsIntoBoundary = YES;// 边界刚体碰撞
[animator addBehavior:collision];
} - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
CGFloat width = self.view.frame.size.width; int x = arc4random()%(int)width;
int z = arc4random()%; UIView *view = [[UIView alloc]initWithFrame:CGRectMake(x, , +z, +z)];
view.backgroundColor = [UIColor greenColor];
view.layer.borderColor = [UIColor blueColor].CGColor;
view.layer.borderWidth = 1.0;
view.layer.masksToBounds = YES;
[self.view addSubview:view]; [dynamic addItem:view];
[gravity addItem:view];
[collision addItem:view];
}
UIPushBehavior+UIGravityBehavior
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib. animator = [[UIDynamicAnimator alloc] initWithReferenceView:self.view]; UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tap:)];
[self.view addGestureRecognizer:tap]; gravity = [[UIGravityBehavior alloc] init];
gravity.gravityDirection = CGVectorMake(, );
gravity.magnitude = 10.0;
[animator addBehavior:gravity];
} - (void)tap:(UITapGestureRecognizer *)tap
{
CGPoint point = [tap locationInView:self.view]; for (CGFloat i = ; i < M_PI*; i = i + 0.2)
{
UIView *view = [[UIView alloc]initWithFrame:CGRectMake(, , , )];
view.center = point;
view.backgroundColor = [UIColor blueColor];
view.layer.cornerRadius = ;
view.layer.masksToBounds = YES;
[self.view addSubview:view]; UIPushBehavior *push = [[UIPushBehavior alloc] initWithItems:@[view]
mode:UIPushBehaviorModeInstantaneous];
push.active = YES;
push.angle = i;
push.magnitude = 0.05;
[animator addBehavior:push]; [gravity addItem:view];
}
}
UIDynamicItemBehavior+UICollisionBehavior+UISnapBehavior
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib. animator = [[UIDynamicAnimator alloc] initWithReferenceView:self.view]; dynamic = [[UIDynamicItemBehavior alloc]init];
dynamic.elasticity = 0.7;// 弹力系数
[animator addBehavior:dynamic]; collision = [[UICollisionBehavior alloc]init];
collision.translatesReferenceBoundsIntoBoundary = YES;// 边界刚体碰撞
[animator addBehavior:collision]; CGFloat width = self.view.frame.size.width;
CGFloat height = self.view.frame.size.height; red = [[UIView alloc] initWithFrame:CGRectMake(, , , )];
red.center = CGPointMake(width/, height/+);
red.backgroundColor = [UIColor redColor];
red.layer.cornerRadius = 15.0;
red.layer.masksToBounds = YES;
[self.view addSubview:red]; [collision addItem:red]; UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tap:)];
[self.view addGestureRecognizer:tap];
} - (void)tap:(UITapGestureRecognizer *)tap
{
CGPoint point = [tap locationInView:self.view]; UIView *view = [[UIView alloc] initWithFrame:CGRectMake(, , , )];
view.center = point;
view.backgroundColor = [UIColor blueColor];
view.layer.cornerRadius = 10.0;
view.layer.masksToBounds = YES;
[self.view addSubview:view]; [collision addItem:view]; UISnapBehavior *snap = [[UISnapBehavior alloc]
initWithItem:view
snapToPoint:red.center];
snap.damping = 0.1;
[animator addBehavior:snap]; dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
[animator removeBehavior:snap];
});
}
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