步骤

方法思路如下：

复制ContentSizeFitter源码出来，改名为ContentSizeFitterEx （AddComponentMenu里面的名字也需要改。）
FitMode增加枚举MaxSize
增加序列化属性m_MaxHorizontal和m_MaxVertical
修改HandleSelfFittingAlongAxis增加maxSize判断
编写GetMaxSize方法
修改完毕替换场景里面的ContentSizeFitter为ContentSizeFitterEx

ContentSizeFitterEx完整源码

复制到项目里面任意位置即可

using System.Collections.Generic;
using UnityEngine.EventSystems;namespace UnityEngine.UI
{internal static class SetPropertyUtility{public static bool SetColor(ref Color currentValue, Color newValue){if (currentValue.r == newValue.r && currentValue.g == newValue.g && currentValue.b == newValue.b &&currentValue.a == newValue.a)return false;currentValue = newValue;return true;}public static bool SetStruct<T>(ref T currentValue, T newValue) where T : struct{if (EqualityComparer<T>.Default.Equals(currentValue, newValue))return false;currentValue = newValue;return true;}public static bool SetClass<T>(ref T currentValue, T newValue) where T : class{if ((currentValue == null && newValue == null) || (currentValue != null && currentValue.Equals(newValue)))return false;currentValue = newValue;return true;}}[AddComponentMenu("Layout/Content Size Fitter Ex", 141)][ExecuteAlways][RequireComponent(typeof(RectTransform))]/// <summary>/// Resizes a RectTransform to fit the size of its content./// </summary>/// <remarks>/// The ContentSizeFitter can be used on GameObjects that have one or more ILayoutElement components, such as Text, Image, HorizontalLayoutGroup, VerticalLayoutGroup, and GridLayoutGroup./// </remarks>public class ContentSizeFitterEx : UIBehaviour, ILayoutSelfController{/// <summary>/// The size fit modes avaliable to use./// </summary>public enum FitMode{/// <summary>/// Don't perform any resizing./// </summary>Unconstrained,/// <summary>/// Resize to the minimum size of the content./// </summary>MinSize,MaxSize,/// <summary>/// Resize to the preferred size of the content./// </summary>PreferredSize}[SerializeField] protected FitMode m_HorizontalFit = FitMode.Unconstrained;[SerializeField] protected int m_MaxHorizontal = 900;[SerializeField] protected int m_MaxVertical = 100;/// <summary>/// The fit mode to use to determine the width./// </summary>public FitMode horizontalFit{get { return m_HorizontalFit; }set{if (SetPropertyUtility.SetStruct(ref m_HorizontalFit, value)) SetDirty();}}[SerializeField] protected FitMode m_VerticalFit = FitMode.Unconstrained;/// <summary>/// The fit mode to use to determine the height./// </summary>public FitMode verticalFit{get { return m_VerticalFit; }set{if (SetPropertyUtility.SetStruct(ref m_VerticalFit, value)) SetDirty();}}[System.NonSerialized] private RectTransform m_Rect;private RectTransform rectTransform{get{if (m_Rect == null)m_Rect = GetComponent<RectTransform>();return m_Rect;}}// field is never assigned warning
#pragma warning disable 649private DrivenRectTransformTracker m_Tracker;
#pragma warning restore 649protected ContentSizeFitterEx(){}protected override void OnEnable(){base.OnEnable();SetDirty();}protected override void OnDisable(){m_Tracker.Clear();LayoutRebuilder.MarkLayoutForRebuild(rectTransform);base.OnDisable();}protected override void OnRectTransformDimensionsChange(){SetDirty();}private void HandleSelfFittingAlongAxis(int axis){FitMode fitting = (axis == 0 ? horizontalFit : verticalFit);if (fitting == FitMode.Unconstrained){// Keep a reference to the tracked transform, but don't control its properties:m_Tracker.Add(this, rectTransform, DrivenTransformProperties.None);return;}m_Tracker.Add(this, rectTransform,(axis == 0 ? DrivenTransformProperties.SizeDeltaX : DrivenTransformProperties.SizeDeltaY));// Set size to min or preferred sizeif (fitting == FitMode.MinSize){rectTransform.SetSizeWithCurrentAnchors((RectTransform.Axis)axis,LayoutUtility.GetMinSize(m_Rect, axis));}else if (fitting == FitMode.MaxSize){//增加maxSize判断返回rectTransform.SetSizeWithCurrentAnchors((RectTransform.Axis)axis, GetMaxSize(m_Rect, axis));}else{rectTransform.SetSizeWithCurrentAnchors((RectTransform.Axis)axis,LayoutUtility.GetPreferredSize(m_Rect, axis));}}/// <summary>/// 增加maxSize获取/// </summary>/// <param name="rect"></param>/// <param name="axis"></param>/// <returns></returns>private float GetMaxSize(RectTransform rect, int axis){var size = axis == 0 ? LayoutUtility.GetPreferredWidth(rect) : LayoutUtility.GetPreferredHeight(rect);if (axis == 0){if (size > m_MaxHorizontal){return m_MaxHorizontal;}}else{if (size > m_MaxVertical){return m_MaxVertical;}}return size;}/// <summary>/// Calculate and apply the horizontal component of the size to the RectTransform/// </summary>public virtual void SetLayoutHorizontal(){m_Tracker.Clear();HandleSelfFittingAlongAxis(0);}/// <summary>/// Calculate and apply the vertical component of the size to the RectTransform/// </summary>public virtual void SetLayoutVertical(){HandleSelfFittingAlongAxis(1);}protected void SetDirty(){if (!IsActive())return;LayoutRebuilder.MarkLayoutForRebuild(rectTransform);}#if UNITY_EDITORprotected override void OnValidate(){SetDirty();}#endif}
}

效果

优化Editor使用

当上面的操作改完之后发现我不选MaxSize也会一直显示MaxHroizontal和MaxVertical属性的设置，假如我想选择了MaxSize的时候才显示配置呢？增加ContentSizeFitterExEditor类即可，注意该类需要放到Editor目录下，例如我是这样子放的：

using UnityEngine;
using UnityEngine.UI;namespace UnityEditor.UI
{[CustomEditor(typeof(ContentSizeFitterEx), true)][CanEditMultipleObjects]/// <summary>/// Custom Editor for the ContentSizeFitter Component./// Extend this class to write a custom editor for a component derived from ContentSizeFitter./// </summary>public class ContentSizeFitterExEditor : SelfControllerEditor{SerializedProperty m_HorizontalFit;SerializedProperty m_VerticalFit;//增加Max配置SerializedProperty m_MaxHorizontal;SerializedProperty m_MaxVertical;protected virtual void OnEnable(){m_HorizontalFit = serializedObject.FindProperty("m_HorizontalFit");m_VerticalFit = serializedObject.FindProperty("m_VerticalFit");//增加属性获取m_MaxHorizontal = serializedObject.FindProperty("m_MaxHorizontal");m_MaxVertical = serializedObject.FindProperty("m_MaxVertical");}public override void OnInspectorGUI(){serializedObject.Update();EditorGUILayout.PropertyField(m_HorizontalFit, true);EditorGUILayout.PropertyField(m_VerticalFit, true);//判断选择了第二个MaxSize才显示max设置if (m_HorizontalFit.enumValueIndex == 2){EditorGUILayout.PropertyField(m_MaxHorizontal);}//判断选择了第二个MaxSize才显示max设置if (m_VerticalFit.enumValueIndex == 2){EditorGUILayout.PropertyField(m_MaxVertical);}serializedObject.ApplyModifiedProperties();base.OnInspectorGUI();}}
}

最后效果如下：

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UGUI-ContentSizeFitter之最简单实现maxSize限制

步骤

ContentSizeFitterEx完整源码

效果

优化Editor使用

UGUI-ContentSizeFitter之最简单实现maxSize限制相关推荐

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