UIDynamicAnimator简述

1.UIDynamicAnimator

是一种物理仿真的容器，引擎。通过添加各种行为，来控制UIView的物理运动。

// 初始化的时候确定作用的范围

- (instancetype)initWithReferenceView:(UIView *)view

// 添加行为

- (void)addBehavior:(UIDynamicBehavior *)behavior;

// 去除行为

- (void)removeBehavior:(UIDynamicBehavior *)behavior;

- (void)removeAllBehaviors;

//重力行为

1)UIGravityBehavior

// 添加行为作用的视图

- (void)addItem:(id <UIDynamicItem>)item;

// CGVector为矢量

就是物理中的矢量图 x方向长度越大方向越偏向x y方向的长度越大越偏向y

@property (readwrite, nonatomic) CGVector gravityDirection;

//重力作用的方向 x为0度

@property (readwrite, nonatomic) CGFloat angle;

// 量级用来控制加速度 1.0代表 1000points/seconds^2

@property (readwrite, nonatomic) CGFloat magnitude;

// 附着行为

2)UIAttachmentBehavior

//给视图添加一个行为并设定一个锚点视图将会围绕锚点摆动

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

// 视图的锚点固定点

@property (readwrite, nonatomic) CGPoint anchorPoint;

// 视图距离锚点的长度

@property (readwrite, nonatomic) CGFloat length;

// 阻尼数值是指任何振动系统在振动中，由于外界作用或系统本身固有的原因引起的振动幅度逐渐下降的特性，以及此一特性的量化表征。在电学中，是响应时间的意思。

@property (readwrite, nonatomic) CGFloat damping; // 1: critical damping

// 振动频率振动物体在单位时间内的振动次数

@property (readwrite, nonatomic) CGFloat frequency; // in Hertz

//摩擦扭矩

@property (readwrite, nonatomic) CGFloat frictionTorque

// 碰撞行为

3)UICollisionBehavior

// 给视图添加碰撞行为

- (void)addItem:(id <UIDynamicItem>)item;

//是否参照视图的bounds为边界

@property (nonatomic, readwrite) BOOL translatesReferenceBoundsIntoBoundary;

// 设置参照视图的bounds为边界并设置内边距

- (void)setTranslatesReferenceBoundsIntoBoundaryWithInsets:(UIEdgeInsets)insets;

// 自己设置路径为bounds为边界

- (void)addBoundaryWithIdentifier:(id <NSCopying>)identifier forPath:(UIBezierPath *)bezierPath;

// 分为三种碰撞类型（元素边界全体）

@property (nonatomic, readwrite) UICollisionBehaviorMode collisionMode;

// 推动行为

4)UIPushBehavior

//推动类型

@property (nonatomic, readonly) UIPushBehaviorMode mode;

@property (nonatomic, readwrite) BOOL active;

// 力的角度

@property (readwrite, nonatomic) CGFloat angle;

// 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;

// 矢量的推动方向

@property (readwrite, nonatomic) CGVector pushDirection;

// 捕捉行为

5)UISnapBehavior

// 为视图添加行为从视图的到制定的点移动

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

// 运动过程中的阻尼

@property (nonatomic, assign) CGFloat damping;

// 公共的特性辅助行为

6）UIDynamicItemBehavior

// 弹性系数

@property (readwrite, nonatomic) CGFloat elasticity; // Usually between 0 (inelastic) and 1 (collide elastically)

// 摩擦系数

@property (readwrite, nonatomic) CGFloat friction; // 0 being no friction between objects slide along each other

// 密度

@property (readwrite, nonatomic) CGFloat density; // 1 by default

// 阻力系数

@property (readwrite, nonatomic) CGFloat resistance; // 0: no velocity damping

// 角阻力旋转时

@property (readwrite, nonatomic) CGFloat angularResistance; // 0: no angular velocity damping

UIDynamicAnimator简述

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