UGUI中按Tab切换InputField

本文转自风冻冰痕博客，固定链接: http://icemark.cn/blog/?p=253

目前的UGUI在InputField里即使设置了Navigation也是不可以用键盘切换上下，所以自己写了个组件实现这个功能
前提条件是要在InputField里设置Navigation，也就是必须能找到上一个控件和下一个控件
然后将以下脚本挂在需要切换的InputField上，用Tab和Shift+Tab切换：

using UnityEngine;
using UnityEngine.UI;
using UnityEngine.EventSystems;

public class InputNavigator : MonoBehaviour, ISelectHandler, IDeselectHandler
{
    EventSystem system;
    private bool _isSelect = false;

    void Start()
    {
        system = EventSystem.current;
    }

    void Update()
    {
        if (Input.GetKeyDown(KeyCode.Tab) && _isSelect)
        {

            Selectable next = null;
            if (Input.GetKey(KeyCode.LeftShift) || Input.GetKey(KeyCode.RightShift))
            {
                next = system.currentSelectedGameObject.GetComponent().FindSelectableOnUp();
                if (next == null) next = system.lastSelectedGameObject.GetComponent();
            }
            else
            {
                next = system.currentSelectedGameObject.GetComponent().FindSelectableOnDown();
                if (next == null) next = system.firstSelectedGameObject.GetComponent();
            }
            if (next != null)
            {
                InputField inputfield = next.GetComponent();
                system.SetSelectedGameObject(next.gameObject, new BaseEventData(system));
            }
            else
            {
                Debug.LogError("找不到下一个控件");
            }
        }
    }

    public void OnSelect(BaseEventData eventData)
    {
        _isSelect = true;
    }

    public void OnDeselect(BaseEventData eventData)
    {
        _isSelect = false;
    }
}