UIDynamic-吸附-重力-碰撞-物理仿真动画

现实生活中：
运动场物理仿真器

跑步物理仿真行为

人==仿真元素
创建步骤：
1.创建物理仿真器,并且指定仿真范围

2.创建物理仿真行为,并且指定仿真元素

3.将物理仿真行为添加到仿真器中
Demo：

#pragma mark -懒加载,创建物理仿真器,并且指定仿真范围

- (UIDynamicAnimator*)dynamicAni
{

   if(!_dynamicAni) {

     // 1.创建物理仿真器,并且指定仿真范围

     _dynamicAni= [[UIDynamicAnimator alloc] initWithReferenceView:self.view];

     }

   return_dynamicAni;

}

#pragma mark -点击屏幕响应事件

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent*)event

{

     //获取当前触摸手指,以及位置

     //UITouch *touch = [touches anyObject];

     //CGPoint point = [touch locationInView:self.view];

     //重力

     [self gravity];

    //碰撞

     //[self collision];

     //吸附

     //[self snapWithPoint:point];

}

#pragma mark -重力

- (void)gravity

{

     // 1.创建物理仿真器,并且指定仿真范围

     // 2.创建物理仿真行为,并且指定仿真元素

     UIGravityBehavior*gravity = [[UIGravityBehavior alloc] initWithItems:@[self.purView]];

     //设置重力的方向

     //gravity.gravityDirection = CGVectorMake(1, 0);

     //gravity.gravityDirection = CGVectorMake(0, -1);

     //gravity.gravityDirection = CGVectorMake(1, 1);

     //设置重力的角度

     //gravity.angle = M_PI_2;

     //设置重力的加速度

     //gravity.magnitude = 100.0;

     // 3.将物理仿真行为添加到仿真器中

     [self.dynamicAni addBehavior:gravity];

}

#pragma mark -碰撞,有重力方能碰撞

- (void)collision

{

     // 1.创建物理仿真器,并且指定仿真范围

     // 2.创建物理仿真行为,并且指定仿真元素

     // 2.1创建重力仿真行为

     UIGravityBehavior*gravity = [[UIGravityBehavior alloc] initWithItems:@[self.purView]];

     gravity.magnitude=3;

    // 2.2创建碰撞仿真行为

     UICollisionBehavior*collision = [[UICollisionBehavior alloc] initWithItems:@[self.purView,self.redView]];

     //碰撞模式

     //collision.collisionMode = UICollisionBehaviorModeItems;

     //是否设置碰撞的边界,默认边界为物理仿真器边界

     //collision.translatesReferenceBoundsIntoBoundary = YES;

     //添加直线边界

    //[collision addBoundaryWithIdentifier:@"line" fromPoint:CGPointMake(0, 400)  toPoint:CGPointMake(320, 500)];

     //添加图形的边界,贝赛尔曲线边界

     UIBezierPath*path = [UIBezierPath bezierPathWithOvalInRect:self.view.frame];

    [collision addBoundaryWithIdentifier:@"rect" forPath:path];

     // 3.将物理仿真行为添加到仿真器中

     [self.dynamicAni addBehavior:gravity];

     [self.dynamicAni addBehavior:collision];

}

#pragma mark -吸附

- (void)snapWithPoint:(CGPoint)point

{

     // 1.创建物理仿真器,并且指定仿真范围

     // 2.创建物理仿真行为,并且指定仿真元素

     UISnapBehavior*snap = [[UISnapBehavior alloc] initWithItem:self.purViewsnapToPoint:point];

     //设置吸附行为的"减震", 0.0~1.0

     snap.damping=.5;

     //注意:使用吸附行为,默认只有一次,如若想要多次必须移除之前的行为再重新添加

     [self.dynamicAni removeAllBehaviors];

     // 3.将物理仿真行为添加到仿真器中

     [self.dynamicAni addBehavior:snap];

}

#pragma mark - QZone

- (void)QZoneAnimation

{

     UIButton *addButton = [UIButton buttonWithType:UIButtonTypeContactAdd];

     addButton.center=CGPointMake(kScreenW/2,kScreenH-50);

     [addButton addTarget:self action:@selector(addButtonAction) forControlEvents:UIControlEventTouchUpInside];

     [self.view addSubview:addButton];

     //初始化弹出的控件

     UIView*view1 = [[UIView alloc] initWithFrame:CGRectMake(0,0,20,20)];

     view1.backgroundColor= [UIColor greenColor];

     view1.center=CGPointMake(kScreenW/2,kScreenH-50);

     view1.tag=101;

     UIView*view2 = [[UIView alloc] initWithFrame:CGRectMake(0,0,20,20)];

     view2.backgroundColor= [UIColor purpleColor];

     view2.center=CGPointMake(kScreenW/2,kScreenH-50);

     view2.tag=102;

     UIView*view3 = [[UIView alloc] initWithFrame:CGRectMake(0,0,20,20)];

     view3.backgroundColor= [UIColor cyanColor];

     view3.center=CGPointMake(kScreenW/2,kScreenH-50);

     view3.tag=103;

     [self.view insertSubview:view1 belowSubview:addButton];

     [self.view insertSubview:view2 belowSubview:addButton];

     [self.view insertSubview:view3 belowSubview:addButton];

}

#pragma mark - addButtonAction

- (void)addButtonAction

{

     //吸附

     //计算坐标

     CGPoint point1 =CGPointMake(kScreenW/2-50,kScreenH-60-50);

     CGPoint point2 =CGPointMake(kScreenW/2,kScreenH-60-100);

     CGPoint point3 =CGPointMake(kScreenW/2+50,kScreenH-60-50);

     CGPoint point =CGPointMake(kScreenW/2,kScreenH-50);

     UIView *view1 = (UIView*)[self.view viewWithTag:101];

     UIView *view2 = (UIView*)[self.view viewWithTag:102];

     UIView *view3 = (UIView*)[self.view viewWithTag:103];

     // 2.物理仿真行为

     UISnapBehavior*snap1 = [[UISnapBehavior alloc] initWithItem:view1  snapToPoint:point1];

     UISnapBehavior*snap2 = [[UISnapBehavior alloc] initWithItem:view2  snapToPoint:point2];

     UISnapBehavior*snap3 = [[UISnapBehavior alloc] initWithItem:view3  snapToPoint:point3];

     UISnapBehavior*snap4 = [[UISnapBehavior alloc] initWithItem:view1  snapToPoint:point];

     UISnapBehavior*snap5 = [[UISnapBehavior alloc] initWithItem:view2  snapToPoint:point];

     UISnapBehavior*snap6 = [[UISnapBehavior alloc] initWithItem:view3  snapToPoint:point];

     if(_isSnap) {

       [self.dynamicAniremoveAllBehaviors];

       // 3.将物理仿真行为添加到仿真器中

       [self.dynamicAni addBehavior:snap1];

       [self.dynamicAni addBehavior:snap2];

       [self.dynamicAni addBehavior:snap3];

     }else{

       [self.dynamicAni removeAllBehaviors];

       snap4.damping=.8;

       snap5.damping=.8;

       snap6.damping=.8;

       // 3.将物理仿真行为添加到仿真器中

       [self.dynamicAni addBehavior:snap4];

       [self.dynamicAni addBehavior:snap5];

       [self.dynamicAni addBehavior:snap6];

     }

     _isSnap= !_isSnap;

}
重力：
碰撞：
吸附：
分散：
巴特西

UIDynamic-吸附-重力-碰撞-物理仿真动画

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