一：前言

获取到选中的文字：哈哈

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二：实现

UGUI的InputField提供了selectionAnchorPosition和selectionFocusPosition，开始选择时的光标下标和当前光标下标

using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;
using System;public class GameInputField : InputField
{private string m_SelectedText;//当前选中的文本public string SelectedText{get{return m_SelectedText;}}private int m_StartSelectedIndex;//起始选中的下标public int StartSelectedIndex{get{return m_StartSelectedIndex;}}private int m_EndSelectedIndex;//结束选中的下标public int EndSelectedIndex{get{return m_EndSelectedIndex;}}private void Update(){if (Input.GetMouseButtonDown(0) && EventSystem.current.currentSelectedGameObject == gameObject){m_StartSelectedIndex = selectionAnchorPosition;}if (Input.GetMouseButtonUp(0) && EventSystem.current.currentSelectedGameObject == gameObject){m_EndSelectedIndex = selectionFocusPosition;if (m_EndSelectedIndex < m_StartSelectedIndex){int temp = m_StartSelectedIndex;m_StartSelectedIndex = m_EndSelectedIndex;m_EndSelectedIndex = temp;}m_SelectedText = text.Substring(m_StartSelectedIndex, m_EndSelectedIndex - m_StartSelectedIndex);}}
}