iOS开发拓展篇—UIDynamic(重力行为+碰撞检测)

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              YYViewController.m

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              12-重力行为和碰撞行为

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              Created by apple on 14-8-6.

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              Copyright (c) 2014年 yangyong. All rights reserved.

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            #import
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            YYViewController.h
            "
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            @interface
             YYViewController ()

             12 @property (weak, nonatomic) IBOutlet UIView *redView;
 13 14 @property (weak, nonatomic) IBOutlet UIProgressView *block1;
 15 @property (weak, nonatomic) IBOutlet UISegmentedControl *block2;
 16 17 @property(nonatomic,strong)UIDynamicAnimator *animator;
 18@end 19 20@implementation YYViewController
 21 -(UIDynamicAnimator *)animator
 22{
 23if (_animator==nil) {
 24//创建物理仿真器（ReferenceView:参照视图，设置仿真范围） 25         self.animator=[[UIDynamicAnimator alloc]initWithReferenceView:self.view];
 26    }
 27return _animator;
 28}
 29 - (void)viewDidLoad
 30{
 31    [super viewDidLoad];
 32 33//设置红色view的角度 34     self.redView.transform=CGAffineTransformMakeRotation(M_PI_4);
 35}
 36 37 -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event 38{
 39//1.重力行为
 40//    [self testGravity];
 41//2.重力行为+碰撞检测
 42//    [self testGravityAndCollsion];
 43//3.测试重力的一些属性 44    [self testGravityAndCollsion2];
 45//用2根线作为边界
 46//    [self testGravityAndCollision3];
 47//4.用圆作为边界
 48//    [self testGravityAndCollision4]; 49}
 50 51/**
 52 *  重力行为
 53*/ 54 -(void)testGravity
 55{
 56//1.创建仿真行为（进行怎样的仿真效果？）
 57//重力行为 58     UIGravityBehavior *gravity=[[UIGravityBehavior alloc]init];
 59//2.添加物理仿真元素 60    [gravity addItem:self.redView];
 61//3.执行仿真，让物理仿真元素执行仿真行为 62    [self.animator addBehavior:gravity];
 63}
 64/**
 65 *  重力行为+碰撞检测
 66*/ 67 -(void)testGravityAndCollsion
 68{
 69//1.重力行为 70     UIGravityBehavior *gravity=[[UIGravityBehavior alloc]init];
 71    [gravity addItem:self.redView];
 72 73//2碰撞检测行为 74     UICollisionBehavior *collision=[[UICollisionBehavior alloc]init];
 75    [collision addItem:self.redView];
 76    [collision addItem:self.block1];
 77    [collision addItem:self.block2];
 78 79//让参照视图的边框成为碰撞检测的边界 80     collision.translatesReferenceBoundsIntoBoundary=YES;
 81 82//3.执行仿真 83    [self.animator addBehavior:gravity];
 84    [self.animator addBehavior:collision];
 85}
 86 87/**
 88 *  测试重力行为的属性
 89*/ 90 -(void)testGravityAndCollsion2
 91{
 92//1.重力行为 93     UIGravityBehavior *gravity=[[UIGravityBehavior alloc]init];
 94//（1）设置重力的方向（是一个角度）
 95//    gravity.angle=(M_PI_2-M_PI_4);
 96//（2）设置重力的加速度,重力的加速度越大，碰撞就越厉害 97     gravity.magnitude=100;
 98//（3）设置重力的方向（是一个二维向量） 99     gravity.gravityDirection=CGVectorMake(0, 1);
100    [gravity addItem:self.redView];
101102//2碰撞检测行为103     UICollisionBehavior *collision=[[UICollisionBehavior alloc]init];
104    [collision addItem:self.redView];
105    [collision addItem:self.block1];
106    [collision addItem:self.block2];
107108//让参照视图的边框成为碰撞检测的边界109     collision.translatesReferenceBoundsIntoBoundary=YES;
110111//3.执行仿真112    [self.animator addBehavior:gravity];
113    [self.animator addBehavior:collision];
114115}
116117/**
118 *  用圆作为边界
119*/120 - (void)testGravityAndCollision4
121{
122// 1.重力行为123     UIGravityBehavior *gravity = [[UIGravityBehavior alloc] init];
124    [gravity addItem:self.redView];
125126// 2.碰撞检测行为127     UICollisionBehavior *collision = [[UICollisionBehavior alloc] init];
128    [collision addItem:self.redView];
129130// 添加一个椭圆为碰撞边界131     UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(0, 0, 320, 320)];
132     [collision addBoundaryWithIdentifier:@"circle" forPath:path];
133134// 3.开始仿真135    [self.animator addBehavior:gravity];
136    [self.animator addBehavior:collision];
137}
138139/**
140 *  用2根线作为边界
141*/142 - (void)testGravityAndCollision3
143{
144// 1.重力行为145     UIGravityBehavior *gravity = [[UIGravityBehavior alloc] init];
146    [gravity addItem:self.redView];
147148// 2.碰撞检测行为149     UICollisionBehavior *collision = [[UICollisionBehavior alloc] init];
150    [collision addItem:self.redView];
151     CGPoint startP = CGPointMake(0, 160);
152     CGPoint endP = CGPointMake(320, 400);
153     [collision addBoundaryWithIdentifier:@"line1" fromPoint:startP toPoint:endP];
154     CGPoint startP1 = CGPointMake(320, 0);
155     [collision addBoundaryWithIdentifier:@"line2" fromPoint:startP1 toPoint:endP];
156//    collision.translatesReferenceBoundsIntoBoundary = YES;
157158// 3.开始仿真159    [self.animator addBehavior:gravity];
160    [self.animator addBehavior:collision];
161}
162@end

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            （3）设置重力的方向（是一个二维向量）
            2 　　gravity.gravityDirection=CGVectorMake(-1, 1);

            1     UICollisionBehavior *collision = [[UICollisionBehavior alloc] init];
2    [collision addItem:self.redView];
3     CGPoint startP = CGPointMake(0, 160);
4     CGPoint endP = CGPointMake(320, 400);
5     [collision addBoundaryWithIdentifier:@"line1" fromPoint:startP toPoint:endP];
6     CGPoint startP1 = CGPointMake(320, 0);
7     [collision addBoundaryWithIdentifier:@"line2" fromPoint:startP1 toPoint:endP];