Unity3D实现导航效果

public class NavigationButton: MonoBehaviour {
 
 Awake(){ }
 
 //按钮被选中时
 public void Select()
 {
  //transform.DOScale(new Vector3(1.75f, 1.75f, 0), 0.3f).SetId(transform.name);
 }
 //按钮未被选中时
 public void UnSelect()
 {
  //DOTween.Kill(transform.name);
  //transform.DOScale(new Vector3(1.0f, 1.0f, 0), 0.3f).SetId(transform.name);
 }
}

public class NavigationPanel : MonoBehaviour {
 //显示
 public void Show() {
  transform.gameObject.SetActive(true);
 }
 //隐藏
 public void Hide() {
  transform.gameObject.SetActive(false);
 }
}

public class NavigationGroup: MonoBehaviour {
 
 public NavigationButton[] navBtns; //按钮组
 public NavigationPanel[] navPans;  //面板组
 
 public int index; //索引
 public int length; //长度
 
 private void Awake()
 {
  index = -1;
  length = navBtns.Length;
 
  for (int i = 0; i < length; i++) {
   navBtns[i].UnSelect();
   navPans[i].Hide();
  }
 }
 
 //通过索引来显示被选中后状态和对应panel
 private void OnSelectByIndex() {
  for (int i = 0; i < length; i++)
  {
   if (i == index)
   {
    navBtns[i].Select();
    navPans[i].Show();
   }
   else
   {
    navBtns[i].UnSelect();
    navPans[i].Hide();
   }
  }
 }
 
 //点击按钮事件
 public void OnClickNavBtn(int value)
 {
  if (index != value) {
   index = value;
   OnSelectByIndex();
  }
 }
 
 //初始被选中的按钮
 public void BeginShow(int values = -1) {
  index = values;
  OnSelectByIndex();
 }
 
 //**********************************************
 //附加：滑动屏幕切换页面
 //**********************************************
 
 private Vector2 beginPos=new Vector2(0,0);
 private Vector2 endPos=new Vector2(0,0);
 private float maxDistance=100;
 
 private void Update()
 {
  //获取鼠标滑动起始坐标和终点坐标
  if (Input.GetMouseButtonDown(0)) {
   beginPos =new Vector2(Input.mousePosition.x, Input.mousePosition.y); 
  }
  if (Input.GetMouseButtonUp(0))
  {
   endPos = new Vector2(Input.mousePosition.x, Input.mousePosition.y);
   SlipDirection();
  }
 }
 //判断滑的方向
 public void SlipDirection() {
  if (Mathf.Abs(beginPos.y - endPos.y) < (Mathf.Abs(beginPos.x - endPos.x))) {
   if (Mathf.Abs(beginPos.x - endPos.x) > maxDistance) {
    if (beginPos.x > endPos.x)
    {
     Next();
    }
    else {
     Prev();
    }
   }
  }
 }
 //向前滑动屏幕
 public void Prev() 
 {
  if (index > 0)
  {
   index--;
   OnSelectByIndex();
  }
 }
 //向后滑动屏幕
 public void Next() 
 {
  if(index<length-1)
  {
   index++;
   OnSelectByIndex();
  } 
 }
 
}

public class MainManager: MonoBehaviour {
 
 public NavigationGroup navGroup;
 
 Start()
 {
  Begin();
 } 
 //调用初始方法
 public void Begin()
 {
  navGroup.BeginShow(0);
 }
 
 //**************************************
 //长时间没交互，返回待机界面
 //**************************************
 
 public void ReturnStandBy() {
  navGroup.BeginShow(0);
 }
 
 private void Update()
 {
  if (Input.GetMouseButtonDown(0)) {
   Invoke("ReturnStandBy", 60.0f);
  }
 }
}