UIDynamics -- 力学部分

来源：互联网发布：python的入门书知乎编辑：程序博客网时间：2024/04/29 23:18
网上资料：http://ningandjiao.iteye.com/blog/2009542
#import "ViewController.h"#import "AZball.h"@interface ViewController (){    AZball *_ball;    UIDynamicAnimator *dynamicAnimator;}@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.        /**        UIDynamics -- 力学部分     */            _ball=[[AZball alloc] initWithFrame:CGRectMake(30, 40, 30, 30)];    [self.view addSubview:_ball];                      //创建行为    /*        可以自定义行为，也可以使用默认的已经封装的一些无力行为：             重力行为：UIGravityBehavior        碰撞行为：UICollisionBehavior        施加一个力:UIPushBehavior          */        // 力学容器,不能提前释放，成员变量    dynamicAnimator=[[UIDynamicAnimator alloc] initWithReferenceView:self.view];    // 重力行为    UIGravityBehavior *gravityBehiver=[[UIGravityBehavior alloc] init];        // 添加受力对象    [gravityBehiver addItem:_ball];        // 碰撞行为    UICollisionBehavior *collisionBehavior=[[UICollisionBehavior alloc] initWithItems:@[_ball]];    //墙壁反弹    collisionBehavior .translatesReferenceBoundsIntoBoundary=YES;         // 施加力    UIPushBehavior *pushBehiver=[[UIPushBehavior alloc] initWithItems:@[_ball] mode:UIPushBehaviorModeContinuous];    // 施加力的方向    pushBehiver.pushDirection=CGVectorMake(0.8, 0);                //将行为放置到 力学容器 ，开始力学效应。    [dynamicAnimator addBehavior:gravityBehiver];    [dynamicAnimator addBehavior:collisionBehavior];    [dynamicAnimator addBehavior:pushBehiver];        }- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}
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