UIPushBehavior :推动效果
UIAttachmentBehavior：附着效果
UISnapBehavior：迅速移动效果
一.重要的属性
UIPushBehavior :推动效果
typedef NS_ENUM(NSInteger, UIPushBehaviorMode) {
UIPushBehaviorModeContinuous, 持续的力
UIPushBehaviorModeInstantaneous 瞬间的力
} NS_ENUM_AVAILABLE_IOS(7_0);
@property (nonatomic, readonly) UIPushBehaviorMode mode; 推动效果的样式
@property (nonatomic, readwrite) BOOL active; 是否激活
@property (readwrite, nonatomic) CGFloat angle; 推动角度
@property (readwrite, nonatomic) CGFloat magnitude; 推动力量
@property (readwrite, nonatomic) CGVector pushDirection; 推动的方向
UISnapBehavior：迅速移动效果
// The point argument is expressed in the reference coordinate system
- (instancetype)initWithItem:(id <UIDynamicItem>)item snapToPoint:(CGPoint)point;
迅速移动效果 只能一次 添加到一个元素上 snapToPoint 让他移动到哪一个点
@property (nonatomic, assign) CGFloat damping; // damping value from 0.0 to 1.0. 0.0 is the least oscillation. damping 的范围是（0.0-1.0）
UIAttachmentBehavior：附着效果
吸附着一个视图 或者一个点 （也可以多个连接）
附着效果 一个视图与一个锚点或者另一个视图相连接的情况
附着行为描述的是两点之间的连接情况，可以模拟刚性或者弹性连接
在多个物体间设定多个UIAttachmentBehavior，可以模拟多物体连接
typedef NS_ENUM(NSInteger, UIAttachmentBehaviorType) {
UIAttachmentBehaviorTypeItems, 吸附一个元素
UIAttachmentBehaviorTypeAnchor 吸附一个点
} NS_ENUM_AVAILABLE_IOS(7_0);
设置吸附效果的样式
@property (readonly, nonatomic) UIAttachmentBehaviorType attachedBehaviorType;
@property (readwrite, nonatomic) CGPoint anchorPoint;锚点
@property (readwrite, nonatomic) CGFloat length;距离 与锚点的距离
@property (readwrite, nonatomic) CGFloat damping; // 1: critical damping 跳跃度
@property (readwrite, nonatomic) CGFloat frequency; // in Hertz 幅度
二.代码
1.推动效果
#import "ViewController.h" @interface ViewController ()
{
UIDynamicAnimator * dynamicAnimator;
UIView *view1; }
@end @implementation ViewController - (void)viewDidLoad {
[super viewDidLoad];
dynamicAnimator = [[UIDynamicAnimator alloc]initWithReferenceView:self.view];
view1 = [[UIView alloc]initWithFrame:CGRectMake(, , , )];
view1.backgroundColor = [UIColor redColor];
[self.view addSubview:view1];
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(pushView)]; [view1 addGestureRecognizer:tap];
- (void)pushView{
[dynamicAnimator removeAllBehaviors];//移除所有的效果
UIPushBehavior * push = [[UIPushBehavior alloc]initWithItems:@[view1] mode:UIPushBehaviorModeContinuous];
// mode的两个属性
// UIPushBehaviorModeContinuous,一直推动
// UIPushBehaviorModeInstantaneous 瞬间推动
push.pushDirection = CGVectorMake(, );
// x是正右，负左。y是正下负上。
push.magnitude = ;//量级：既是推动力大小
//设置成NO时就不再响应效果
// push.active = NO;
[dynamicAnimator addBehavior:push];//把推动效果添加到效果器上
}
2.瞬间移动效果(viewDidLoad里面添加另一个点击手势)
UITapGestureRecognizer *tap1 = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(snap:)];
[self.view addGestureRecognizer:tap1];
之后
-(void)snap:(UITapGestureRecognizer *)send{
[dynamicAnimator removeAllBehaviors];
// 迅速移动效果 只能一次 添加到一个元素上 snapToPoint 让他移动到哪一个点
UISnapBehavior * snap = [[UISnapBehavior alloc]initWithItem:view1 snapToPoint:[send locationInView:self.view]];
//跳动幅度：0~1,值越小，跳动幅度越大
snap.damping = ;
[dynamicAnimator addBehavior:snap];
}
吸附效果
@interface ViewController ()
{
UIDynamicAnimator * dynamicAnimator;
UIView *view1;
UIView *view2;
}
@end @implementation ViewController - (void)viewDidLoad {
[super viewDidLoad];
dynamicAnimator = [[UIDynamicAnimator alloc]initWithReferenceView:self.view];
view1 = [[UIView alloc]initWithFrame:CGRectMake(, , , )];
view1.backgroundColor = [UIColor redColor]; [self.view addSubview:view1]; view2 = [[UIView alloc]initWithFrame:CGRectMake(, , , )];
view2.backgroundColor = [UIColor blueColor];
[self.view addSubview:view2]; UITapGestureRecognizer *tap2 = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(attachment:)]; [self.view addGestureRecognizer:tap2]; }
-(void)attachment:(UITapGestureRecognizer *)send{
[dynamicAnimator removeAllBehaviors];
// 吸附到视图的某个点
UIAttachmentBehavior * attachment = [[UIAttachmentBehavior alloc]initWithItem:view1 offsetFromCenter:UIOffsetMake(, ) attachedToAnchor:[send locationInView:self.view]];
attachment.length = ;//吸附范围
attachment.damping = 0.5;
attachment.frequency = ;
[dynamicAnimator addBehavior:attachment];
// 两个元素吸附
// UIAttachmentBehavior *attachment1 = [[UIAttachmentBehavior alloc]initWithItem:view1 offsetFromCenter:UIOffsetMake(50, 50) attachedToItem:view2 offsetFromCenter:UIOffsetMake(50, 50)];
// attachment1.length = 50;//吸附范围
// attachment1.damping = 0.5;
// attachment1.frequency = 50;
// [dynamicAnimator addBehavior:attachment1];
}
另外，在iOS9之前这些效果只支持矩形。IOS9之后增加了新的属性UIDynamicItemCollisionBoundsType；因为本人的Xcode没升级，没法使用。