iOS_UIDynamicAnimator

UIDynamic是用来模拟现实世界的物理模型，包括物理模型的

{

     1.0 UIGravityBehavior 重力行为；

     2.0 UICollisionBehavior 碰撞行为；

     3.0 UIAttachmentBehavior 附着行为；

     4.0 UISnapBehavior 吸附行为；

     5.0 UIPushBehavior 推动行为;

}

//
//  ViewController.m
//  UIDynamicAnimator
//
//  Created by Kong on 16/2/24.
//
//

#import "ViewController.h"

@interface ViewController ()

@property (nonatomic, strong) UIDynamicAnimator *animator;

@property (nonatomic, strong) UIView *animatiorView;

@property (nonatomic, strong) UIView *animation2View;

@property (nonatomic, assign) CGFloat damping;
@property (strong, nonatomic) IBOutlet UIView *bothViews;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    self.view.backgroundColor = [UIColor blackColor];
    [self buildAnimatiorView];
    [self setDynamicAnimator];
}

- (void)buildAnimatiorView
{
    self.animatiorView                 = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
    self.animatiorView.backgroundColor = [UIColor purpleColor];
    [self.bothViews addSubview:self.animatiorView];
    
    self.animation2View                = [[UIView alloc] initWithFrame:CGRectMake(100, 300, 100, 100)];
    self.animation2View.backgroundColor= [UIColor magentaColor];
    [self.bothViews addSubview:self.animation2View];
    
}

- (void)setDynamicAnimator
{
    self.animator = [[UIDynamicAnimator alloc] initWithReferenceView:self.bothViews];
}

- (IBAction)gravityBehavior:(id)sender {
    [self.animator removeAllBehaviors];
    self.animatiorView.frame  = CGRectMake(0, 0, 100, 100);
    self.animation2View.frame = CGRectMake(100, 300, 100, 100);
    /**
     UIGravityBehavior, 重力仿真。
     */
    UIGravityBehavior *snap             = [[UIGravityBehavior alloc]\
                                           initWithItems:@[self.animatiorView, self.animation2View]]; //这里设置哪个 View 进行重力仿真运动。
    //防止重力碰撞。
    UICollisionBehavior *collision      = [[UICollisionBehavior alloc]\
                                           initWithItems:@[self.animatiorView, self.animation2View]];//设置哪个 View 进行重力碰撞事件。
    collision.translatesReferenceBoundsIntoBoundary = YES;  //设置可以进行重力碰撞。
    
    UIDynamicItemBehavior *itmeBehavior = [[UIDynamicItemBehavior alloc] initWithItems:@[self.animatiorView]];
    itmeBehavior.elasticity             = 0.5; //(弹性系数)，值在【0~1】之间;
    itmeBehavior.friction               = 20; //(摩擦系数);
    itmeBehavior.density                = 20; //(密度);密度和 size 结合使用，计算物体的总质量;
    itmeBehavior.resistance             = 1;  //阻力，决定线性移动的阻力大小，与摩擦系数不同，摩擦系数值用于滑动;
    itmeBehavior.angularResistance      = 1; //决定旋转运动时候的阻力大小,必须旋转的时候才能感受到;
    itmeBehavior.allowsRotation         = YES;
    
    [self.animator removeAllBehaviors];
    [self.animator addBehavior:snap];
    [self.animator addBehavior:itmeBehavior];
    [self.animator addBehavior:collision];

}
- (IBAction)collisionBehavior:(id)sender {
    [self.animator removeAllBehaviors];
    self.animatiorView.frame  = CGRectMake(0, 0, 100, 100);
    self.animation2View.frame = CGRectMake(100, 300, 100, 100);
    UIGravityBehavior *snap             = [[UIGravityBehavior alloc]\
                                           initWithItems:@[self.animatiorView]]; //这里设置哪个 View 进行重力仿真运动。
    /**
     *  这里就是反弹效果和其他效果一起使用的，重力作用
     */
    UICollisionBehavior *itmeBehavior   = [[UICollisionBehavior alloc] initWithItems:@[self.animatiorView]];
    itmeBehavior.translatesReferenceBoundsIntoBoundary = YES;

    [self.animator removeAllBehaviors];
    [self.animator addBehavior:snap];
    [self.animator addBehavior:itmeBehavior];
}

- (IBAction)attachmentBehavior:(id)sender {
    [self.animator removeAllBehaviors];
    self.animatiorView.frame  = CGRectMake(0, 0, 100, 100);
    self.animation2View.frame = CGRectMake(100, 300, 100, 100);
    UIAttachmentBehavior *attachmentBehavior = [[UIAttachmentBehavior alloc] initWithItem:self.animatiorView attachedToAnchor:CGPointMake(200, 200)];
    attachmentBehavior.anchorPoint = CGPointMake(200, 100);
    attachmentBehavior.length      = 100; 
    attachmentBehavior.damping     = 0.1;   //阻尼;
    attachmentBehavior.frequency   = 1;     //频率;
    attachmentBehavior.frictionTorque = 1;  //转动摩擦力;
    [self.animator removeAllBehaviors];
    [self.animator addBehavior:attachmentBehavior];
}
- (IBAction)snapBehavior:(id)sender {
    [self.animator removeAllBehaviors];
    self.animatiorView.frame  = CGRectMake(0, 0, 100, 100);
    self.animation2View.frame = CGRectMake(100, 300, 100, 100);
    UISnapBehavior *snap      = [[UISnapBehavior alloc] initWithItem:self.animatiorView snapToPoint:CGPointMake(200, 100)];
    snap.damping              = 0.2; //【0~1】之间，0轻，1重;
    [self.animator addBehavior:snap];
}
- (IBAction)PushBehavior:(id)sender {
    [self.animator removeAllBehaviors];
    self.animatiorView.frame     = CGRectMake(0, 0, 100, 100);
    self.animation2View.frame    = CGRectMake(100, 300, 100, 100);
    UIPushBehavior *pushBehavior = [[UIPushBehavior alloc]\
                                    initWithItems:@[self.animatiorView] mode:UIPushBehaviorModeContinuous];
    pushBehavior.active          = YES;
    pushBehavior.angle           = 1.0f; //推动的方向;
    pushBehavior.magnitude       = 1.0f; //推力的大小;
    UICollisionBehavior *itmeBehavior   = [[UICollisionBehavior alloc] initWithItems:@[self.animatiorView]];
    itmeBehavior.translatesReferenceBoundsIntoBoundary = YES;
    [self.animator removeAllBehaviors];
    [self.animator addBehavior:itmeBehavior];
    [self.animator addBehavior:pushBehavior];
}


@end