十一、Unity编辑器开发之Toggle

当我们需要切换一个bool值的时候通常需要用到Toggle开关，Toggle的绘制需要用到GUILayout.Toggle或EditorGUILayout.Toggle方法。

using UnityEngine;
using UnityEditor;

[CustomEditor(typeof(Test))]
public class TestEditor : Editor
{
    private bool boolValue;

    public override void OnInspectorGUI()
    {
        GUILayout.Toggle(boolValue, "开关");
    }
}

上述代码表示绘制一个Toggle来表示boolValue的值。

如果需要点击Toggle开关时来切换boolValue的值，需要boolValue接收GUILayout的返回值：

using UnityEngine;
using UnityEditor;

[CustomEditor(typeof(Test))]
public class TestEditor : Editor
{
    private bool boolValue;

    public override void OnInspectorGUI()
    {
        boolValue = GUILayout.Toggle(boolValue, "开关");
    }
}

通常我们会使用一个新的bool值来接收返回值，假如值不一样时才进行赋值：

using UnityEngine;
using UnityEditor;

[CustomEditor(typeof(Test))]
public class TestEditor : Editor
{
    private bool boolValue;

    public override void OnInspectorGUI()
    {
        bool newValue = GUILayout.Toggle(boolValue, "开关");
        if (newValue != boolValue)
        {
            boolValue = newValue;
        }
    }
}

这样可以在赋值之前使用Undo类来记录我们的操作，当我们希望撤销操作时可以使用Ctrl+Z来撤销操作，当然Undo类的使用不在此进行介绍。

下面是GUILayout绘制Toggle的所有方法、重载：

public static bool Toggle (bool value, GUIContent content, GUIStyle style, params GUILayoutOption[] options);
public static bool Toggle (bool value, string text, GUIStyle style, params GUILayoutOption[] options);
public static bool Toggle (bool value, Texture image, GUIStyle style, params GUILayoutOption[] options);
public static bool Toggle (bool value, GUIContent content, params GUILayoutOption[] options);
public static bool Toggle (bool value, string text, params GUILayoutOption[] options);
public static bool Toggle (bool value, Texture image, params GUILayoutOption[] options);

下面是EditorGUILayout绘制Toggle的所有方法、重载：

public static bool Toggle (GUIContent label, bool value, GUIStyle style, params GUILayoutOption[] options);
public static bool Toggle (string label, bool value, GUIStyle style, params GUILayoutOption[] options);
public static bool Toggle (bool value, GUIStyle style, params GUILayoutOption[] options);
public static bool Toggle (GUIContent label, bool value, params GUILayoutOption[] options);
public static bool Toggle (string label, bool value, params GUILayoutOption[] options);
public static bool Toggle (bool value, params GUILayoutOption[] options);
public static bool ToggleLeft (GUIContent label, bool value, GUIStyle labelStyle, params GUILayoutOption[] options);
public static bool ToggleLeft (string label, bool value, GUIStyle labelStyle, params GUILayoutOption[] options);
public static bool ToggleLeft (GUIContent label, bool value, params GUILayoutOption[] options);
public static bool ToggleLeft (string label, bool value, params GUILayoutOption[] options);