相關概念：
UIPushBehavior :推動效果
typedef NS_ENUM(NSInteger, UIPushBehaviorMode) {
UIPushBehaviorModeContinuous, 持續的力
UIPushBehaviorModeInstantaneous 瞬間的力
} NS_ENUM_AVAILABLE_IOS(7_0);
@property (nonatomic, readonly) UIPushBehaviorMode mode; 推動效果的樣式
@property (nonatomic, readwrite) BOOL active; 是否激活
@property (readwrite, nonatomic) CGFloat angle; 推動角度
// A continuous force vector with a magnitude of 1.0, applied to a 100 point x 100 point view whose density value is 1.0, results in view acceleration of 100 points per s^2
@property (readwrite, nonatomic) CGFloat magnitude; 推動力量
@property (readwrite, nonatomic) CGVector pushDirection; 推動的方向
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UISnapBehavior：迅速移動效果
// The point argument is expressed in the reference coordinate system
- (instancetype)initWithItem:(id <UIDynamicItem>)item snapToPoint:(CGPoint)point;
迅速移動效果 只能一次 添加到一個元素上 snapToPoint 讓他移動到哪一個點
@property (nonatomic, assign) CGFloat damping; // damping value from 0.0 to 1.0. 0.0 is the least oscillation. damping 的範圍是（0.0-1.0）
------------------------------
typedef NS_ENUM(NSInteger, UIAttachmentBehaviorType) {
UIAttachmentBehaviorTypeItems, 吸附一個元素
UIAttachmentBehaviorTypeAnchor 吸附一個點
} NS_ENUM_AVAILABLE_IOS(7_0);
設置吸附效果的樣式
@property (readonly, nonatomic) UIAttachmentBehaviorType attachedBehaviorType;
UIAttachmentBehavior：附着效果
吸附着一個視圖 或者一個點 （也可以多個連接）
附着效果 一個視圖與一個錨點或者另一個視圖相連接的情況
附着行爲描述的是兩點之間的連接情況，可以模擬剛性或者彈性連接
在多個物體間設定多個UIAttachmentBehavior，可以模擬多物體連接
typedef NS_ENUM(NSInteger, UIAttachmentBehaviorType) {
UIAttachmentBehaviorTypeItems, 吸附一個元素
UIAttachmentBehaviorTypeAnchor 吸附一個點
} NS_ENUM_AVAILABLE_IOS(7_0);
設置吸附效果的樣式
@property (readonly, nonatomic) UIAttachmentBehaviorType attachedBehaviorType;
@property (readwrite, nonatomic) CGPoint anchorPoint;錨點
@property (readwrite, nonatomic) CGFloat length;距離 與錨點的距離
@property (readwrite, nonatomic) CGFloat damping; // 1: critical damping 跳躍度
@property (readwrite, nonatomic) CGFloat frequency; // in Hertz 幅度
具體代碼：
#import "ViewController.h"
@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(100, 100, 100, 100)];
view1.backgroundColor = [UIColor colorWithRed:0.622 green:0.926 blue:1.000 alpha:1.000];
[self.view addSubview:view1];
view2 = [[UIView alloc]initWithFrame:CGRectMake(100+100, 100+100, 100, 100)];
view2.backgroundColor = [UIColor colorWithRed:0.143 green:1.000 blue:0.312 alpha:1.000];
[self.view addSubview:view2];
// UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tagAction:)];
// [view1 addGestureRecognizer:tap];
// UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(snap:)];
// [self.view addGestureRecognizer:tap];
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(attachments:)];
[self.view addGestureRecognizer:tap];
}
#pragma mark-推送
-(void)tagAction:(UITapGestureRecognizer *)sender
{
[dynamicAnimator removeAllBehaviors];
UIPushBehavior *push = [[UIPushBehavior alloc]initWithItems:@[view1] mode:UIPushBehaviorModeContinuous];
// x 正右 負左 y正下 負上
push.pushDirection = CGVectorMake(1, 3);
// push.active = NO; //設置了就沒有效果了
// 推送的力度
push.magnitude = 10;
[dynamicAnimator addBehavior:push];
}
#pragma mark-快速移動
-(void)snap:(UITapGestureRecognizer *)sender
{
[dynamicAnimator removeAllBehaviors];
// 迅速移動效果 只能一次 添加到一個元素上 snapToPoint 讓他移動到哪一個點
UISnapBehavior *snap = [[UISnapBehavior alloc]initWithItem:view1 snapToPoint:[sender locationInView:self.view]];
snap.damping = 0.1; //跳動的弧度 0-1
[dynamicAnimator addBehavior:snap];
}
#pragma mark-吸附效果
-(void)attachments:(UITapGestureRecognizer *)sender
{
[dynamicAnimator removeAllBehaviors];
// offsetFromCenter:<#(UIOffset)#> 距離中心的偏移量
UIAttachmentBehavior *attach = [[UIAttachmentBehavior alloc]initWithItem:view1 offsetFromCenter:UIOffsetMake(20, 20) attachedToAnchor:[sender locationInView:self.view]];
// attach.length = 10; //距離點擊點的位置
attach.damping = 0.1; //跳動的幅度
attach.frequency = 10;
[dynamicAnimator addBehavior:attach];
// UIAttachmentBehavior *attach1 = [[UIAttachmentBehavior alloc]initWithItem:view1 offsetFromCenter:UIOffsetMake(50, 50) attachedToItem:view2 offsetFromCenter:UIOffsetMake(100, 100)];
// attach1.length = 50; //距離點擊點的位置
// attach1.damping = 0.1; //跳動的幅度
// attach1.frequency = 10;
// [dynamicAnimator addBehavior:attach1];
UIAttachmentBehavior *attah2 = [[UIAttachmentBehavior alloc]initWithItem:view1 attachedToItem:view2];
attah2.damping = 0.1; //跳動的幅度
attah2.frequency = 10;
[dynamicAnimator addBehavior:attah2];
UIPushBehavior *push = [[UIPushBehavior alloc]initWithItems:@[view1] mode:UIPushBehaviorModeContinuous];
// x 正右 負左 y正下 負上
push.pushDirection = CGVectorMake(1, 3);
// push.active = NO; //設置了就沒有效果了
// 推送的力度
push.magnitude = 10;
[dynamicAnimator addBehavior:push];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end