Unity InputField输入框自适应文字内容

可设置输入框的指定宽度以及高度。效果类似微信的输入框。

LayoutUtility.GetPreferredHeight：返回布局元素的首选高度

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

[RequireComponent(typeof(InputField))]
public class InputContentSize : MonoBehaviour
{
    public int fontSize = 14;   //输入框的字体大小，InputField的大小会随字体大小改变高度
    public bool fixedWidth = true;  //是否保持InputField的宽度不变
    private Vector2 originalSize;   //输入框初始大小
    int maxHight = 94;//初始输入框高度+每次增加的高度*n 例如初始高度是30 每次增加是16 想最多显示5行就是30+16*4=94 那最大高度值就是94

    private Text textComponent
    {
        get
        {
            return this.GetComponent<InputField>().textComponent;
        }
    }

    private RectTransform m_Rect;
    private RectTransform rectTransform
    {
        get
        {
            if (m_Rect == null)
                m_Rect = GetComponent<RectTransform>();
            return m_Rect;
        }
    }

    private InputField _inputField;
    public InputField inputField
    {
        get
        {
            return _inputField ?? (_inputField = this.GetComponent<InputField>());
        }
    }


    protected void Awake()
    {
        textComponent.fontSize = fontSize;
        inputField.placeholder.GetComponent<Text>().fontSize = fontSize;
        this.originalSize = this.GetComponent<RectTransform>().sizeDelta;
        inputField.lineType = fixedWidth ? InputField.LineType.MultiLineNewline : InputField.LineType.SingleLine;

       // rectTransform.SetSizeWithCurrentAnchors((RectTransform.Axis)1, this.originalSize.y);
    }

    void OnEnable()
    {
        this.inputField.onValueChanged.AddListener(OnValueChanged);
    }
    public void OnValueChanged(string v)
    {
        if (!fixedWidth)
        {
            rectTransform.SetSizeWithCurrentAnchors((RectTransform.Axis)0, LayoutUtility.GetPreferredWidth(m_Rect));
        }
        int i = (int)(LayoutUtility.GetPreferredHeight(m_Rect)) / 16;
        if(LayoutUtility.GetPreferredHeight(m_Rect) >= maxHight)
        {
            rectTransform.SetSizeWithCurrentAnchors((RectTransform.Axis)1, maxHight);
        }
        else
        {
            rectTransform.SetSizeWithCurrentAnchors((RectTransform.Axis)1, i <= 1 ? 30 : 30 + 16 * (i - 1));
        }

        //rectTransform.SetSizeWithCurrentAnchors((RectTransform.Axis)1, LayoutUtility.GetPreferredHeight(m_Rect));
    }


   
}