GUILayout.ExpandWidth

public static GUILayoutOption ExpandWidth (bool expand);

Description

传递给控件以允许或禁止水平扩展的选项。

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    void OnGUI() {
        GUILayout.BeginVertical();
        GUILayout.Button("Short Button", GUILayout.ExpandWidth(false));
        GUILayout.Button("Very very long Button");
        GUILayout.EndVertical();
    }
}