在做聊天输入框的时候，UGUI自带的InputField只能设置输入内容显示最新输入的内容和输入固定长度的内容，并没有自适应内容改变输入框的长度和宽度，网上搜了一下，在蛮牛上看到一个能自适应长度的，可以根据内容改变输入框的长度，但是如果长度太长就会超出范围，后来我把代码改了一下，可以固定长度，然后自动换行，自适应宽度。
整体的思路就是继承UGUI提供的Layout接口，根据接口提供的方法计算出输入内容的宽高，接口方法就能够自适应宽高。下面是效果。文章源自大腿Plus-https://www.zhaoshijun.com/archives/814
文章源自大腿Plus-https://www.zhaoshijun.com/archives/814
上面就是运行后的效果，下面就上代码。文章源自大腿Plus-https://www.zhaoshijun.com/archives/814
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using System.Collections; using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEngine.UI; using UnityEngine.EventSystems; [RequireComponent(typeof(InputField))] public class InputFieldScaler : MonoBehaviour, ILayoutElement { private Text textComponent { get { return this.GetComponent().textComponent; } } public TextGenerationSettings GetTextGenerationSettings(Vector2 extents) { var settings = textComponent.GetGenerationSettings(extents); settings.generateOutOfBounds = true; return settings; } private RectTransform m_Rect; private RectTransform rectTransform { get { if (m_Rect == null) m_Rect = GetComponent(); return m_Rect; } } public void OnValueChanged(string v) { if (!fixedWidth) { rectTransform.SetSizeWithCurrentAnchors((RectTransform.Axis)0, LayoutUtility.GetPreferredWidth(m_Rect)); } rectTransform.SetSizeWithCurrentAnchors((RectTransform.Axis)1, LayoutUtility.GetPreferredHeight(m_Rect)); } void OnEnable() { this.inputField.onValueChanged.AddListener(OnValueChanged); } void OnDisable() { } private Vector2 originalSize; private InputField _inputField; public InputField inputField { get { return _inputField ?? (_inputField = this.GetComponent()); } } private float _offsetHeight; public float offsetHeight { get { if (_offsetHeight == 0) _offsetHeight = generatorForLayout.GetPreferredHeight(text, GetTextGenerationSettings(Vector2.zero)) / textComponent.pixelsPerUnit; return _offsetHeight; } } private float _offsetTextComponentLeftRingt; public float offsetTextComponentLeftRingt { get { if (_offsetTextComponentLeftRingt == 0) _offsetTextComponentLeftRingt = Mathf.Abs(rectTransform.rect.width - textComponent.rectTransform.rect.width); return _offsetTextComponentLeftRingt; } } protected void Awake() { textComponent.fontSize = fontSize; inputField.placeholder.GetComponent().fontSize = fontSize; this.originalSize = this.GetComponent().sizeDelta; inputField.lineType = fixedWidth ? InputField.LineType.MultiLineNewline : InputField.LineType.SingleLine; rectTransform.SetSizeWithCurrentAnchors((RectTransform.Axis)1, LayoutUtility.GetPreferredHeight(m_Rect)); } private string text { get { return this.GetComponent().text; } } private TextGenerator _generatorForLayout; public TextGenerator generatorForLayout { get { return _generatorForLayout ?? (_generatorForLayout = new TextGenerator()); } } public void Update() { } public float preferredWidth { get { if (fixedWidth) { return this.originalSize.x; } else { if (keepInitWidthSize) { return Mathf.Max(this.originalSize.x, generatorForLayout.GetPreferredWidth(text, GetTextGenerationSettings(Vector2.zero)) / textComponent.pixelsPerUnit + offsetTextComponentLeftRingt); } else { return generatorForLayout.GetPreferredWidth(text, GetTextGenerationSettings(Vector2.zero)) / textComponent.pixelsPerUnit + offsetTextComponentLeftRingt; } } } } public virtual float preferredHeight { get { if (fixedWidth) { return generatorForLayout.GetPreferredHeight(text, GetTextGenerationSettings(new Vector2(this.textComponent.GetPixelAdjustedRect().size.x, 0.0f))) / textComponent.pixelsPerUnit + offsetHeight; } else { return generatorForLayout.GetPreferredHeight(text, GetTextGenerationSettings(new Vector2(this.textComponent.GetPixelAdjustedRect().size.x, 0.0f))) / textComponent.pixelsPerUnit + offsetHeight; } } } public virtual void CalculateLayoutInputHorizontal() { } public virtual void CalculateLayoutInputVertical() { } public virtual float minWidth { get { return -1; } } public virtual float minHeight { get { return -1; } } public virtual float flexibleWidth { get { return -1; } } public virtual float flexibleHeight { get { return -1; } } //[Tooltip("输入框的字体大小，InputField的大小会随字体大小改变高度")] [HideInInspector] public int fontSize = 20; //[Tooltip("是否保持InputField的宽度不变")] [HideInInspector] public bool fixedWidth = true; //[Tooltip("是否不限制InputField的宽度")] [HideInInspector] public bool keepInitWidthSize = true; //[SerializeField] //[Tooltip("提高Layout计算优先级，要比InputField大 这里设为1")] private int priority = 1; public virtual int layoutPriority { get { return priority; } } } |
代码其实很简单，就是通过输入的字符串的内容，在接口方法里计算出宽高就可以了，接口方法会被自动调用。文章源自大腿Plus-https://www.zhaoshijun.com/archives/814
参考代码：http://www.manew.com/thread-107880-1-1.html文章源自大腿Plus-https://www.zhaoshijun.com/archives/814
下载链接: https://pan.baidu.com/s/1ZpOQueUyUg1ef7LpJTKShw 提取码: tk8h文章源自大腿Plus-https://www.zhaoshijun.com/archives/814 文章源自大腿Plus-https://www.zhaoshijun.com/archives/814
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