动画行为

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   1.创建仿真者ReferenceView:仿真区域(参考系)

self.animator = [[UIDynamicAnimatoralloc] initWithReferenceView:self.view];

2.创建仿真行为重力行为

UIGravityBehavior * gravity = [[UIGravityBehavioralloc] initWithItems:@[self.redView]];

2.1设置重力方向

方式一 (包括方向和大小)

gravity.gravityDirection = CGVectorMake(10, 10);

方式二

设置方向
gravity.angle= M_PI_4;

设置大小 1000 points/second²

gravity.magnitude= 10;

3.把仿真行为添加到仿真者中

[self.animatoraddBehavior:gravity];

2.创建仿真行为(碰撞行为)
UICollisionBehavior* collision = [[UICollisionBehavioralloc]initWithItems:@[self.redView]];

设置YES就是把仿真区域转化为碰撞的边界

collision.translatesReferenceBoundsIntoBoundary =YES;

弹性系数(0 ---- 1)

item.elasticity =0;

2.创建仿真行为(吸附)
UISnapBehavior* snap = [[UISnapBehavioralloc]initWithItem:self.redViewsnapToPoint:locP];

阻尼系数(0 --- 1) 0:最抖动 1:最不抖动

snap.damping =0;

附着行为

- (instancetype)initWithItem:(id <UIDynamicItem>)item attachedToAnchor:(CGPoint)point;

元素附着到点

- (instancetype)initWithItem:(id <UIDynamicItem>)item offsetFromCenter:(UIOffset)offset attachedToAnchor:(CGPoint)point NS_DESIGNATED_INITIALIZER;

元素附着到指定点(根据center偏移)

- (instancetype)initWithItem:(id <UIDynamicItem>)item1 attachedToItem:(id <UIDynamicItem>)item2;

元素之间的附着

- (instancetype)initWithItem:(id <UIDynamicItem>)item1 offsetFromCenter:(UIOffset)offset1 attachedToItem:(id <UIDynamicItem>)item2 offsetFromCenter:(UIOffset)offset2 NS_DESIGNATED_INITIALIZER;

指定元素之间的附着点(根据每个元素的center偏移)

2.创建仿真行为(附着行为)

UIAttachmentBehavior * attachment = [[UIAttachmentBehavior alloc] initWithItem:self.redView attachedToAnchor:locP];

获取红色View的size

CGSize reSize = self.redView.bounds.size;

UIAttachmentBehaviorTypeItems,元素之间的附着

UIAttachmentBehaviorTypeAnchor元素和点的附着

    附着行为 (刚性附着弹性附着)
    UIAttachmentBehavior* attachment = [[UIAttachmentBehavioralloc]initWithItem:self.redViewoffsetFromCenter:UIOffsetMake(-reSize.width/2, -reSize.height/2)attachedToAnchor:locP];
    设置线长
attachment.length = 100;

    CZView * view = (CZView*)self.view;
    设置起点和终点
    attachment.action= ^{
        设置起点
        view.startPoint= locP;
        设置终点
view.endPoint = self.redView.center;
        转换坐标点
        view.endPoint= [self.viewconvertPoint:CGPointZerofromView:self.redView];
    };

  设置弹性附着 (同时设置以下两个属性)
    频率
    attachment.frequency= 0.5;
    阻尼系数

attachment.damping =0.5;

2.创建仿真行为平推

UIPushBehaviorModeContinuous, 持续

UIPushBehaviorModeInstantaneous 瞬时一次性

UIPushBehavior * push = [[UIPushBehavioralloc] initWithItems:@[self.redView]mode:UIPushBehaviorModeInstantaneous];

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