EditorPrefs.HasKey

参数

返回值

bool 键是否存在。

描述

如果key存在于首选项文件中，则返回 true。

检查首选项文件以识别指定的键是否存在。返回 true 或 false。在以下示例中，可以将键和值写入首选项文件，或将其删除。使用 HasKey 函数检查键是否存在并显示消息。


使用保存、删除和 HasKey 首选项检查。

// Small example where the XyZ key can be saved or deleted from the Preferences file.
// The existence of the key is checked using the HasKey() function.

using UnityEngine;
using UnityEditor;

public class HasKeyExample : EditorWindow
{
    private string keyName = "XyZ";

    [MenuItem("Examples/HasKey Example")]
    static void Init()
    {
        HasKeyExample window = (HasKeyExample)EditorWindow.GetWindowWithRect(
            typeof(HasKeyExample), new Rect(0, 0, 250, 80));
        window.Show();
    }

    void OnGUI()
    {
        EditorGUILayout.BeginHorizontal();

        if (GUILayout.Button("Save '" + keyName + "' as Key"))
            EditorPrefs.SetString(keyName, "abc123");

        if (GUILayout.Button("Delete Key '" + keyName + "'"))
            EditorPrefs.DeleteKey(keyName);

        EditorGUILayout.EndHorizontal();

        GUILayout.Label(keyName + " key exists: " + EditorPrefs.HasKey(keyName));

        if (GUILayout.Button("Close"))
            this.Close();
    }

    // delete the key each time the demo starts
    void OnFocus()
    {
        EditorPrefs.DeleteKey(keyName);
    }
}