UIDynamic物理仿真行为代码示例
UIGravityBehavior重力行为
- (void)viewDidLoad {
[super viewDidLoad];
// UIView --继承了UIDynamicItem协议---物体
// 父类UIDynamicBehavior -- 物理仿真行为 iOS7以后才有效
//
// UIDynamicAnimator --物理仿真器 --物理仿真行为添加到物理仿真器 开始工作
}
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
//1 创建物理仿真器
//coordinate system 坐标系
//initWithReferenceView 设置物理仿真器的参考视图, 仿真行为和仿真元素会使用参考视图的坐标系
UIDynamicAnimator *animator = [[UIDynamicAnimator alloc] initWithReferenceView:self.view];
self.animator = animator;
//2 创建物理仿真行为 Gravity重力 -- 设置哪些物体实现该行为
UIGravityBehavior *gravity = [[UIGravityBehavior alloc] initWithItems:@[self.myView]];
//4 设置物理仿真行为的属性
//设置向量
// gravity.gravityDirection = CGVectorMake(500, 500);
// //弧度 方向
// gravity.angle = 0;
// //重力加速度 100 point / s*s
// gravity.magnitude = 1;
//当动画执行时候会不停调用action
[gravity setAction:^{
NSLog(@"%@",NSStringFromCGRect(self.myView.frame));
}];
//3 把物理仿真行为添加到物理仿真器中
[animator addBehavior:gravity];
}
====================================
UICollisionBehavior碰撞行为
#import "ViewController.h"
@interface ViewController () <UICollisionBehaviorDelegate>
@property (weak, nonatomic) IBOutlet UIView *myView;
@property (weak, nonatomic) IBOutlet UIView *otherView;
@property (nonatomic, strong) UIDynamicAnimator *animator;
@end
//演示1 碰撞边界
//演示2 通过辅助行为--设置弹性系数,阻力系数,是否旋转
//演示3 两个物体碰撞
//演示4 自定义碰撞边界--设置两个点,设置路径
//演示5 碰撞的模式 collisionMode
//演示6 检测碰撞
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
//1 创建物理仿真器
self.animator = [[UIDynamicAnimator alloc] initWithReferenceView:self.view];
//2 创建仿真行为
//2.1 重力行为
UIGravityBehavior *gravity = [[UIGravityBehavior alloc] initWithItems:@[self.myView,self.otherView]];
//2.2 碰撞行为
UICollisionBehavior *collision = [[UICollisionBehavior alloc] initWithItems:@[self.myView,self.otherView]];
//参考视图的边界作为碰撞的边界
collision.translatesReferenceBoundsIntoBoundary = YES;
//碰撞的模式
//UICollisionBehaviorModeItems 只和物体碰撞
//UICollisionBehaviorModeBoundaries 只和边界碰撞
//UICollisionBehaviorModeEverything 物体碰撞和边界碰撞
collision.collisionMode = UICollisionBehaviorModeEverything;
//2.2.1 设置碰撞边界
// [collision addBoundaryWithIdentifier:@"b1" fromPoint:CGPointMake(0, 400) toPoint:CGPointMake(190, 400)];
//2.2.2 设置碰撞边界
UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(200, 300, 200, 150)];
[collision addBoundaryWithIdentifier:@"b2" forPath:path];
//检测碰撞
collision.collisionDelegate = self;
//2.3 辅助行为--设置弹性
UIDynamicItemBehavior *item = [[UIDynamicItemBehavior alloc] initWithItems:@[self.myView]];
//弹性系数
item.elasticity = 1;
//阻力
item.resistance = 0;
//是否允许物体旋转
// item.allowsRotation = NO;
//3 把行为添加到物理仿真器
[self.animator addBehavior:gravity];
[self.animator addBehavior:collision];
[self.animator addBehavior:item];
}
//物体跟边界开始碰撞
- (void)collisionBehavior:(UICollisionBehavior *)behavior beganContactForItem:(id<UIDynamicItem>)item withBoundaryIdentifier:(id<NSCopying>)identifier atPoint:(CGPoint)p {
//碰撞的物体
UIView *view = (UIView *)item;
//边界的id
NSString *strId = (NSString *)identifier;
//判断碰撞的边界id是否是预期的
if ([strId isEqualToString:@"b2"]) {
NSLog(@"==");
//随机颜色
int random1 = arc4random_uniform(256);
int random2 = arc4random_uniform(256);
int random3 = arc4random_uniform(256);
//记录下来原来的颜色
UIColor *color = view.backgroundColor;
[UIView animateWithDuration:0.3 animations:^{
view.backgroundColor = [UIColor colorWithRed:random1/255.0 green:random2/255.0 blue:random3/255.0 alpha:1];
} completion:^(BOOL finished) {
//还原原来的颜色
view.backgroundColor = color;
}];
}
}
@end
#import "ViewController.h"
@interface ViewController ()
@property (weak, nonatomic) IBOutlet UIView *myView;
@property (nonatomic, strong) UIDynamicAnimator *animator;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
//获取当前点击的坐标
UITouch *touch = [touches anyObject];
CGPoint point = [touch locationInView:self.view];
//1 创建物理仿真器
self.animator = [[UIDynamicAnimator alloc] initWithReferenceView:self.view];
//2 创建捕捉行为 -- 改变的是物体中心点的坐标
UISnapBehavior *snap = [[UISnapBehavior alloc] initWithItem:self.myView snapToPoint:point];
//3 把行为添加到仿真器
//阻尼系数--阻力
//默认值是0.5
snap.damping = 0.5;
[self.animator addBehavior:snap];
}
@end
UIAttachmentBehavior附着行为
#import "ViewController.h"
#import "CZView.h"
@interface ViewController ()
@property (weak, nonatomic) IBOutlet UIView *myView;
@property (nonatomic, strong) UIDynamicAnimator *animator;
@end
//演示1 重力行为和附着行为--刚性行为
//演示2 连线
//演示3 弹性行为--把频率设置为非0
//演示4 设置中心点的偏移
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.myView.alpha = 0.5;
}
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
//获取点击的坐标
UITouch *touch = [touches anyObject];
CGPoint point = [touch locationInView:self.view];
//1 创建物理仿真器
self.animator = [[UIDynamicAnimator alloc] initWithReferenceView:self.view];
//2 创建仿真行为
//2.1 重力行为
UIGravityBehavior *gravity = [[UIGravityBehavior alloc] initWithItems:@[self.myView]];
//2.2 附着行为 Attachment附件
//默认是和物体的中心点附着...修改中心点的偏移量 ,附着左上角
CGSize size = self.myView.bounds.size; //myView的size
UIOffset offset = UIOffsetMake(-size.width * 0.5, -size.height * 0.5);
UIAttachmentBehavior *attachment = [[UIAttachmentBehavior alloc] initWithItem:self.myView offsetFromCenter:offset attachedToAnchor:point];
//刚性行为
//弹性行为
//把控制器的view 转换成CZView
CZView *view = (CZView *)self.view;
//action 当动画执行的时候执行--画线
[gravity setAction:^{
//设置起始点和结束点
view.startPoint = point;
//获取myView坐标系中 myView左上角的点 0,0
CGPoint myPoint = CGPointZero;
//把myView坐标系中的点,转换成self.view坐标系中的坐标
view.endPoint = [self.view convertPoint:myPoint fromView:self.myView];
}];
//长度--设置中心点和附着点之间的距离
// attachment.length = 60;
//弹性行为
//阻尼 减震 -- 默认值 0
// attachment.damping = 0.5;
// //频率 -- 默认值 0 当震动频率为0 没有弹性
// attachment.frequency = 0.5;
//3 把行为添加到仿真器
[self.animator addBehavior:gravity];
[self.animator addBehavior:attachment];
}
@end
#import "CZView.h"
@implementation CZView
- (void)setEndPoint:(CGPoint)endPoint {
_endPoint = endPoint;
[self setNeedsDisplay]; //重绘
}
//画线
- (void)drawRect:(CGRect)rect {
// Drawing code
UIBezierPath *path = [UIBezierPath bezierPath];
[path moveToPoint:self.startPoint];
[path addLineToPoint:self.endPoint];
[path stroke];
}
UIPushBehavior推动行为
#import "ViewController.h"
@interface ViewController ()
@property (weak, nonatomic) IBOutlet UIView *myView;
@property (nonatomic, strong) UIDynamicAnimator *animator;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
//获取点击的点
UITouch *touch = [touches anyObject];
CGPoint point = [touch locationInView:self.view]; //点击的点的坐标
//1 创建物理仿真器
self.animator = [[UIDynamicAnimator alloc] initWithReferenceView:self.view];
//2 创建物理仿真行为
//2.1 推行为
// UIPushBehaviorModeContinuous, 持续推 一直有手推着
// UIPushBehaviorModeInstantaneous 一次性推 只推一次
UIPushBehavior *push = [[UIPushBehavior alloc] initWithItems:@[self.myView] mode:UIPushBehaviorModeContinuous];
//加速度--默认是0 必须设置该值
// push.magnitude = 1;
// push.angle = M_PI_2;
//向量
// push.pushDirection = CGVectorMake(0, 1);
//计算推动的方向
CGFloat x = self.myView.center.x - point.x;
CGFloat y = self.myView.center.y - point.y;
push.pushDirection = CGVectorMake(x, y);
//设置加速度
push.magnitude = sqrtf(x * x + y*y) * 0.01;
//2.2 碰撞行为
UICollisionBehavior *collision = [[UICollisionBehavior alloc] initWithItems:@[self.myView]];
//设置碰撞的边界
collision.translatesReferenceBoundsIntoBoundary = YES;
//2.3 重力行为
// UIGravityBehavior *gravity = [[UIGravityBehavior alloc] initWithItems:@[self.myView]];
//2.4 辅助项行为
UIDynamicItemBehavior *item = [[UIDynamicItemBehavior alloc] initWithItems:@[self.myView]];
//弹性
// item.elasticity = 1;
//摩擦力 默认是0
// item.friction = 50;
//阻力
// item.resistance = 1;
//3 把行为添加到仿真器
[self.animator addBehavior:push];
[self.animator addBehavior:collision];
// [self.animator addBehavior:gravity];
[self.animator addBehavior:item];
}
@end