UIPushBehavior :推动效果 ,UISnapBehavior：迅速移动效果,UIAttachmentBehavior：附着效果

// UIPushBehavior :推动效果typedef NS_ENUM(NSInteger, UIPushBehaviorMode) { UIPushBehaviorModeContinuous,// 持续的力 UIPushBehaviorModeInstantaneous// 瞬间的力 } NS_ENUM_AVAILABLE_IOS(7_0); @property (nonatomic, readonly) UIPushBehaviorMode mode; //推动效果的样式 @property (nonatomic, readwrite) BOOL active; //是否激活 @property (readwrite, nonatomic) CGFloat angle; //推动角度 // A continuous force vector with a magnitude of 1.0, applied to a 100 point x 100 point view whose density value is 1.0, results in view acceleration of 100 points per s^2 @property (readwrite, nonatomic) CGFloat magnitude; //推动力量 @property (readwrite, nonatomic) CGVector pushDirection; //推动的方向

//UISnapBehavior：迅速移动效果 // The point argument is expressed in the reference coordinate system - (instancetype)initWithItem:(id <UIDynamicItem>)item snapToPoint:(CGPoint)point; //迅速移动效果 只能一次 添加到一个元素上  snapToPoint 让他移动到哪一个点 @property (nonatomic, assign) CGFloat damping; // damping value from 0.0 to 1.0. 0.0 is the least oscillation. damping 的范围是（0.0-1.0） typedef NS_ENUM(NSInteger, UIAttachmentBehaviorType) { UIAttachmentBehaviorTypeItems, //吸附一个元素 UIAttachmentBehaviorTypeAnchor //吸附一个点 } NS_ENUM_AVAILABLE_IOS(7_0); //设置吸附效果的样式 @property (readonly, nonatomic) UIAttachmentBehaviorType attachedBehaviorType;

//UIAttachmentBehavior：附着效果 //吸附着一个视图 或者一个点  （也可以多个连接） //附着效果 一个视图与一个锚点或者另一个视图相连接的情况 //附着行为描述的是两点之间的连接情况，可以模拟刚性或者弹性连接 //在多个物体间设定多个UIAttachmentBehavior，可以模拟多物体连接 typedef NS_ENUM(NSInteger, UIAttachmentBehaviorType) { UIAttachmentBehaviorTypeItems, //吸附一个元素 UIAttachmentBehaviorTypeAnchor //吸附一个点 } NS_ENUM_AVAILABLE_IOS(7_0); //设置吸附效果的样式 @property (readonly, nonatomic) UIAttachmentBehaviorType attachedBehaviorType; @property (readwrite, nonatomic) CGPoint anchorPoint;//锚点 @property (readwrite, nonatomic) CGFloat length;//距离 与锚点的距离 @property (readwrite, nonatomic) CGFloat damping; // 1: critical damping  //跳跃度 @property (readwrite, nonatomic) CGFloat frequency; // in Hertz   幅度

首先定义要使用的两个视图和容器为全局变量

UIDynamicAnimator *dynamicAnimator;    UIView *view1;    UIView *view2;

初始化视图 和UIDynamicAnimator

dynamicAnimator = [[UIDynamicAnimator alloc]initWithReferenceView:self.view];    view1 = [[UIView alloc]initWithFrame:CGRectMake(50, 50, 100, 100)];    view1.backgroundColor = [UIColor orangeColor];    [self.view addSubview:view1];    view2 = [[UIView alloc]initWithFrame:CGRectMake(150, 50, 100, 100)];    view2.backgroundColor = [UIColor grayColor];    [self.view addSubview:view2];    //添加一个手势来触发方法 UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(pushView)];    [view1 addGestureRecognizer:tap];//    //    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(snap:)];//    [self.view addGestureRecognizer:tap];//    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(attachment:)];//    [self.view addGestureRecognizer:tap];

推动效果

- (void)pushView{//    先把容器里面的效果移除    [dynamicAnimator removeAllBehaviors]; //   初始化一个推动效果 //initWithItems后面添加的是一个 数组    UIPushBehavior *push = [[UIPushBehavior alloc]initWithItems:@[view1] mode:UIPushBehaviorModeContinuous];//    设置推的方向//    x正右负左  y正下 负上    push.pushDirection = CGVectorMake(1, 0);    push.magnitude=1;    //添加到效果器里面    [dynamicAnimator addBehavior:push];}

吸附效果

-(void)attachment:(UITapGestureRecognizer *)sender{//同样先移除里面的效果    [dynamicAnimator removeAllBehaviors];    //初始化吸附效果    //initWithItem这里注意 后面加的是一个视图，而不是数组    //initWithItems后面加的才是数组，这里多了个  s    UIAttachmentBehavior *attachment = [[UIAttachmentBehavior alloc]initWithItem:view1 offsetFromCenter:UIOffsetMake(20, 20) attachedToAnchor:[sender locationInView:self.view]];    attachment.length = 10;    attachment.damping = 0.1;    attachment.frequency = 6;    [dynamicAnimator addBehavior:attachment];UIAttachmentBehavior *attachment2 = [[UIAttachmentBehavior alloc]initWithItem:view1 offsetFromCenter:UIOffsetMake(50, 50)  attachedToItem:view2 offsetFromCenter:UIOffsetMake(50, 50)];    attachment2.length = 10;    attachment2.damping = 0.1;    attachment2.frequency = 6;    [dynamicAnimator addBehavior:attachment2];}

迅速移动效果

- (void)snap:(UITapGestureRecognizer *)sender{    [dynamicAnimator removeAllBehaviors];//    迅速移动效果 只能一次 添加到一个元素上 snapToPoint让它移动到哪一个点、    UISnapBehavior *snap = [[UISnapBehavior alloc]initWithItem:view1 snapToPoint:[sender locationInView:self.view]];    snap.damping = 0.1;    [dynamicAnimator addBehavior:snap];}