用途:
从一个点移动到另外一个点;
相关属性:
mode : UIPushBehaviorModeContinuous //推移模式
angle : setAngle //推移角度
magnitude : setMagnitude //速度 每1个magnigude将会引起100/平方秒的加速度
图片说明:
p1 : squareView的中心点 p2 : 单击的点
促使squareView朝着p2移动，因为加了UICollisionBehavior，所以移动时又不会超过边界
代码:
//
// YFPushBehaviorViewController.m
// BigShow1949
//
// Created by apple on 16/8/25.
// Copyright © 2016年 BigShowCompany. All rights reserved.
// #import "YFPushBehaviorViewController.h" @interface YFPushBehaviorViewController ()
@property(nonatomic,strong)UIDynamicAnimator *animator;
@property (nonatomic, strong) UIView *squareView;
@property (nonatomic, strong) UIPushBehavior *pushBehavior; @end @implementation YFPushBehaviorViewController
- (void)viewDidLoad { [super viewDidLoad];
self.view.backgroundColor = [UIColor whiteColor]; } - (void)viewDidAppear:(BOOL)animated{
[super viewDidAppear:animated]; // 创建一个正方形
self.squareView =[[UIView alloc] initWithFrame: CGRectMake(0.0f, 0.0f, 80.0f, 80.0f)];
self.squareView.backgroundColor = [UIColor greenColor];
self.squareView.center = self.view.center;
[self.view addSubview:self.squareView]; // 视图单机手势
[self createGestureRecognizer]; [self createAnimatorAndBehaviors];
} - (void) createGestureRecognizer{
UITapGestureRecognizer *tapGestureRecognizer =
[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTap:)];
[self.view addGestureRecognizer:tapGestureRecognizer];
} - (void) handleTap:(UITapGestureRecognizer *)paramTap{ CGPoint tapPoint = [paramTap locationInView:self.view]; //p2
CGPoint squareViewCenterPoint = self.squareView.center; //p1 CGFloat deltaX = tapPoint.x - squareViewCenterPoint.x;
CGFloat deltaY = tapPoint.y - squareViewCenterPoint.y;
CGFloat angle = atan2(deltaY, deltaX);
[self.pushBehavior setAngle:angle]; //推移的角度 //勾股
CGFloat distanceBetweenPoints =
sqrt(pow(tapPoint.x - squareViewCenterPoint.x, 2.0) +
pow(tapPoint.y - squareViewCenterPoint.y, 2.0));
//double pow(double x, double y）;计算以x为底数的y次幂
//double sqrt (double);开平方 //推力的大小（移动速度）
[self.pushBehavior setMagnitude:distanceBetweenPoints / 50.0f];
//每1个magnigude将会引起100/平方秒的加速度，这里分母越大，速度越小 }
- (void) createSmallSquareView{
self.squareView =[[UIView alloc] initWithFrame: CGRectMake(0.0f, 0.0f, 80.0f, 80.0f)]; self.squareView.backgroundColor = [UIColor greenColor];
self.squareView.center = self.view.center; [self.view addSubview:self.squareView];
}
- (void) createAnimatorAndBehaviors{
self.animator = [[UIDynamicAnimator alloc] initWithReferenceView:self.view]; /* Create collision detection */
UICollisionBehavior *collision = [[UICollisionBehavior alloc]
initWithItems:@[self.squareView]];
collision.translatesReferenceBoundsIntoBoundary = YES; self.pushBehavior = [[UIPushBehavior alloc]
initWithItems:@[self.squareView]
mode:UIPushBehaviorModeContinuous]; [self.animator addBehavior:collision];
[self.animator addBehavior:self.pushBehavior];
} @end