//
//  ViewController.m
//  06-UIDynamic#import "ViewController.h"@interface ViewController ()
@property (weak, nonatomic) IBOutlet UIView *blueView;
/** 物理仿真器 */
@property (nonatomic, strong) UIDynamicAnimator *animator;
@property (weak, nonatomic) IBOutlet UISegmentedControl *segmentControl;
@end@implementation ViewController- (UIDynamicAnimator *)animator
{if (!_animator) {// 创建物理仿真器(ReferenceView, 参照视图, 其实就是设置仿真范围)_animator = [[UIDynamicAnimator alloc] initWithReferenceView:self.view];}return _animator;
}- (void)viewDidLoad {[super viewDidLoad];// Do any additional setup after loading the view, typically from a nib.
    self.blueView.transform = CGAffineTransformMakeRotation(M_PI_4);
}- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {// 获得触摸点UITouch *touch = [touches anyObject];CGPoint point = [touch locationInView:self.view];// 创建吸附\捕捉行为UISnapBehavior *snap = [[UISnapBehavior alloc] initWithItem:self.blueView snapToPoint:point];// 防抖系数(值越小, 越抖)snap.damping = 1.0;// 添加行为
    [self.animator removeAllBehaviors];[self.animator addBehavior:snap];
}- (void)testCollision2
{// 1.创建 碰撞行为UICollisionBehavior *collision = [[UICollisionBehavior alloc] init];[collision addItem:self.blueView];//    [collision addItem:self.segmentControl];// 添加边界//    CGFloat startX = 0;//    CGFloat startY = self.view.frame.size.height * 0.5;//    CGFloat endX = self.view.frame.size.width;//    CGFloat endY = self.view.frame.size.height;//    [collision addBoundaryWithIdentifier:@"line1" fromPoint:CGPointMake(startX, startY) toPoint:CGPointMake(endX, endY)];//    [collision addBoundaryWithIdentifier:@"line2" fromPoint:CGPointMake(endX, 0) toPoint:CGPointMake(endX, endY)];
    CGFloat width = self.view.frame.size.width;UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(0, 0, width, width)];[collision addBoundaryWithIdentifier:@"circle" forPath:path];// 2.创建物理仿真行为 - 重力行为UIGravityBehavior *gravity = [[UIGravityBehavior alloc] init];gravity.magnitude = 10;[gravity addItem:self.blueView];// 3.添加行为
    [self.animator addBehavior:collision];[self.animator addBehavior:gravity];
}- (void)testCollision
{// 1.创建 碰撞行为UICollisionBehavior *collision = [[UICollisionBehavior alloc] init];// 让参照视图的bounds变为碰撞检测的边框collision.translatesReferenceBoundsIntoBoundary = YES;[collision addItem:self.blueView];[collision addItem:self.segmentControl];// 2.创建物理仿真行为 - 重力行为UIGravityBehavior *gravity = [[UIGravityBehavior alloc] init];gravity.magnitude = 100;[gravity addItem:self.blueView];// 3.添加行为
    [self.animator addBehavior:collision];[self.animator addBehavior:gravity];
}- (void)testGravity
{// 1.创建物理仿真行为 - 重力行为UIGravityBehavior *gravity = [[UIGravityBehavior alloc] init];[gravity addItem:self.blueView];// 重力方向//    gravity.gravityDirection = CGVectorMake(100, 100);// 重力加速度()gravity.magnitude = 10;// 100 point/s²// 移动的距离 = 1/2 * magnitude * 时间²// 2.添加 物理仿真行为 到 物理仿真器 中, 开始物理仿真
    [self.animator addBehavior:gravity];
}
@end