Show If Attribute用于任何屬性，并且可以在檢查器中隱藏該屬性。使用此選項可根據(jù)對象的當前狀態(tài)隱藏不相關的屬性。

這個特性的效果主要是當指定條件滿足時，顯示對應的屬性，默認傳入的參數(shù)為對應屬性的名稱，如果為True或者不為null時，顯示屬性

    [ShowIf("IsToggled")]
    public Vector2 VisibleWhenToggled;

還以指定一個選項值，當指定的屬性與這個值拼配時，顯示屬性

    [ShowIf("SomeEnum", InfoMessageType.Info)]
    public Vector3 Info;

    [ShowIf("SomeEnum", InfoMessageType.Warning)]
    public Vector2 Warning;

    [ShowIf("SomeEnum", InfoMessageType.Error)]
    public Vector3 Error;

可以使用@特殊符號寫入表達式，其表達式的值作為實參

    [ShowIf("@this.IsToggled && this.SomeObject != null || this.SomeEnum == InfoMessageType.Error")]
    public Vector3 HideWhenNull;

完整示例代碼

using Sirenix.OdinInspector;
using UnityEngine;

public class ShowIfAttributeExample : MonoBehaviour
{
    public UnityEngine.Object SomeObject;

    [EnumToggleButtons]
    public InfoMessageType SomeEnum;

    public bool IsToggled;

    [ShowIf("SomeEnum", InfoMessageType.Info)]
    public Vector3 Info;

    [ShowIf("SomeEnum", InfoMessageType.Warning)]
    public Vector2 Warning;

    [ShowIf("SomeEnum", InfoMessageType.Error)]
    public Vector3 Error;

    [ShowIf("IsToggled")]
    public Vector2 VisibleWhenToggled;

    [ShowIf("@this.IsToggled && this.SomeObject != null || this.SomeEnum == InfoMessageType.Error")]
    public Vector3 HideWhenNull;
}

更多教程內容詳見：革命性Unity 編輯器擴展工具 --- Odin Inspector 系列教程