現(xiàn)實(shí)生活中：
運(yùn)動(dòng)場(chǎng)==物理仿真器
跑步==物理仿真行為
人==仿真元素
創(chuàng)建步驟：
// 1.創(chuàng)建物理仿真器,并且指定仿真范圍
// 2.創(chuàng)建物理仿真行為,并且指定仿真元素
// 3.將物理仿真行為添加到仿真器中
Demo：
#pragma mark -懶加載,創(chuàng)建物理仿真器,并且指定仿真范圍
- (UIDynamicAnimator*)dynamicAni
{
? ?if(!_dynamicAni) {
? ? ?// 1.創(chuàng)建物理仿真器,并且指定仿真范圍
? ? ?_dynamicAni= [[UIDynamicAnimator alloc] initWithReferenceView:self.view];
? ? ?}
? ?return_dynamicAni;
}
#pragma mark -點(diǎn)擊屏幕響應(yīng)事件
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent*)event
{
? ? ?//獲取當(dāng)前觸摸手指,以及位置
? ? ?//UITouch *touch = [touches anyObject];
? ? ?//CGPoint point = [touch locationInView:self.view];
? ? ?//重力
? ? ?[self gravity];
? ? ?//碰撞
? ? ?//[self collision];
? ? ?//吸附
? ? ?//[self snapWithPoint:point];
}
#pragma mark -重力
- (void)gravity
{
? ? ?// 1.創(chuàng)建物理仿真器,并且指定仿真范圍
? ? ?// 2.創(chuàng)建物理仿真行為,并且指定仿真元素
? ? ?UIGravityBehavior*gravity = [[UIGravityBehavior alloc] initWithItems:@[self.purView]];
? ? ?//設(shè)置重力的方向
? ? ?//gravity.gravityDirection = CGVectorMake(1, 0);
? ? ?//gravity.gravityDirection = CGVectorMake(0, -1);
? ? ?//gravity.gravityDirection = CGVectorMake(1, 1);
? ? ?//設(shè)置重力的角度
? ? ?//gravity.angle = M_PI_2;
? ? ?//設(shè)置重力的加速度
? ? ?//gravity.magnitude = 100.0;
? ? ?// 3.將物理仿真行為添加到仿真器中
? ? ?[self.dynamicAni addBehavior:gravity];
}
#pragma mark -碰撞,有重力方能碰撞
- (void)collision
{
? ? ?// 1.創(chuàng)建物理仿真器,并且指定仿真范圍
? ? ?// 2.創(chuàng)建物理仿真行為,并且指定仿真元素
? ? ?// 2.1創(chuàng)建重力仿真行為
? ? ?UIGravityBehavior*gravity = [[UIGravityBehavior alloc] initWithItems:@[self.purView]];
? ? ?gravity.magnitude=3;
? ? ?// 2.2創(chuàng)建碰撞仿真行為
? ? ?UICollisionBehavior*collision = [[UICollisionBehavior alloc] initWithItems:@[self.purView,self.redView]];
? ? ?//碰撞模式
? ? ?//collision.collisionMode = UICollisionBehaviorModeItems;
? ? ?//是否設(shè)置碰撞的邊界,默認(rèn)邊界為物理仿真器邊界
? ? ?//collision.translatesReferenceBoundsIntoBoundary = YES;
? ? ?//添加直線邊界
? ? ?//[collision addBoundaryWithIdentifier:@"line" fromPoint:CGPointMake(0, 400) ?toPoint:CGPointMake(320, 500)];
? ? ?//添加圖形的邊界,貝賽爾曲線邊界
? ? ?UIBezierPath*path = [UIBezierPath bezierPathWithOvalInRect:self.view.frame];
[collision addBoundaryWithIdentifier:@"rect" forPath:path];
? ? ?// 3.將物理仿真行為添加到仿真器中
? ? ?[self.dynamicAni addBehavior:gravity];
? ? ?[self.dynamicAni addBehavior:collision];
}
#pragma mark -吸附
- (void)snapWithPoint:(CGPoint)point
{
? ? ?// 1.創(chuàng)建物理仿真器,并且指定仿真范圍
? ? ?// 2.創(chuàng)建物理仿真行為,并且指定仿真元素
? ? ?UISnapBehavior*snap = [[UISnapBehavior alloc] initWithItem:self.purViewsnapToPoint:point];
? ? ?//設(shè)置吸附行為的"減震", 0.0~1.0
? ? ?snap.damping=.5;
? ? ?//注意:使用吸附行為,默認(rèn)只有一次,如若想要多次必須移除之前的行為再重新添加
? ? ?[self.dynamicAni removeAllBehaviors];
? ? ?// 3.將物理仿真行為添加到仿真器中
? ? ?[self.dynamicAni addBehavior:snap];
}
#pragma mark - QZone
- (void)QZoneAnimation
{
? ? ?UIButton *addButton = [UIButton buttonWithType:UIButtonTypeContactAdd];
? ? ?addButton.center=CGPointMake(kScreenW/2,kScreenH-50);
? ? ?[addButton addTarget:self action:@selector(addButtonAction) forControlEvents:UIControlEventTouchUpInside];
? ? ?[self.view addSubview:addButton];
? ? ?//初始化彈出的控件
? ? ?UIView*view1 = [[UIView alloc] initWithFrame:CGRectMake(0,0,20,20)];
? ? ?view1.backgroundColor= [UIColor greenColor];
? ? ?view1.center=CGPointMake(kScreenW/2,kScreenH-50);
? ? ?view1.tag=101;
? ? ?UIView*view2 = [[UIView alloc] initWithFrame:CGRectMake(0,0,20,20)];
? ? ?view2.backgroundColor= [UIColor purpleColor];
? ? ?view2.center=CGPointMake(kScreenW/2,kScreenH-50);
? ? ?view2.tag=102;
? ? ?UIView*view3 = [[UIView alloc] initWithFrame:CGRectMake(0,0,20,20)];
? ? ?view3.backgroundColor= [UIColor cyanColor];
? ? ?view3.center=CGPointMake(kScreenW/2,kScreenH-50);
? ? ?view3.tag=103;
? ? ?[self.view insertSubview:view1 belowSubview:addButton];
? ? ?[self.view insertSubview:view2 belowSubview:addButton];?
? ? ?[self.view insertSubview:view3 belowSubview:addButton];
}
#pragma mark - addButtonAction
- (void)addButtonAction
{
? ? ?//吸附
? ? ?//計(jì)算坐標(biāo)
? ? ?CGPoint point1 =CGPointMake(kScreenW/2-50,kScreenH-60-50);
? ? ?CGPoint point2 =CGPointMake(kScreenW/2,kScreenH-60-100);
? ? ?CGPoint point3 =CGPointMake(kScreenW/2+50,kScreenH-60-50);
? ? ?CGPoint point =CGPointMake(kScreenW/2,kScreenH-50);
? ? ?UIView *view1 = (UIView*)[self.view viewWithTag:101];
? ? ?UIView *view2 = (UIView*)[self.view viewWithTag:102];
? ? ?UIView *view3 = (UIView*)[self.view viewWithTag:103];
? ? ?// 2.物理仿真行為
? ? ?UISnapBehavior*snap1 = [[UISnapBehavior alloc] initWithItem:view1 ?snapToPoint:point1];
? ? ?UISnapBehavior*snap2 = [[UISnapBehavior alloc] initWithItem:view2 ?snapToPoint:point2];
? ? ?UISnapBehavior*snap3 = [[UISnapBehavior alloc] initWithItem:view3 ?snapToPoint:point3];
? ? ?UISnapBehavior*snap4 = [[UISnapBehavior alloc] initWithItem:view1 ?snapToPoint:point];
? ? ?UISnapBehavior*snap5 = [[UISnapBehavior alloc] initWithItem:view2 ?snapToPoint:point];
? ? ?UISnapBehavior*snap6 = [[UISnapBehavior alloc] initWithItem:view3 ?snapToPoint:point];
? ? ?if(_isSnap) {
? ? ? ?[self.dynamicAniremoveAllBehaviors];
? ? ? ?// 3.將物理仿真行為添加到仿真器中
? ? ? ?[self.dynamicAni addBehavior:snap1];
? ? ? ?[self.dynamicAni addBehavior:snap2];
? ? ? ?[self.dynamicAni addBehavior:snap3];
? ? ?}else{
? ? ? ?[self.dynamicAni removeAllBehaviors];
? ? ? ?snap4.damping=.8;
? ? ? ?snap5.damping=.8;
? ? ? ?snap6.damping=.8;
? ? ? ?// 3.將物理仿真行為添加到仿真器中
? ? ? ?[self.dynamicAni addBehavior:snap4];
? ? ? ?[self.dynamicAni addBehavior:snap5];
? ? ? ?[self.dynamicAni addBehavior:snap6];
? ? ?}
? ? ?_isSnap= !_isSnap;
}
重力：
碰撞：
吸附：
分散：
