Unity 创建自定义属性绘制器

简介：

Unity自带了一些属性绘制的特性
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自定义：

如果我们需要自定义类似于Unity提供的特性，那就需要通过自己实现逻辑

实现案例:

通过标签，使自定义的字段由整数显示成为时间的形式（时分秒）

1.创建属性

public class TimeAttribute : PropertyAttribute
{
    public readonly bool DisplayHours;
    public TimeAttribute(bool displayHours = false)
    {
        DisplayHours = displayHours;
    }
}

2.定义绘制器

[CustomPropertyDrawer(typeof(TimeAttribute))]
public class TimeDrawer : PropertyDrawer
{
    public override float GetPropertyHeight(SerializedProperty property, GUIContent label)
    {
        return EditorGUI.GetPropertyHeight(property) * 2;
    }

    public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
    {
        if (property.propertyType == SerializedPropertyType.Integer)
        {
            property.intValue = EditorGUI.IntField(
                new Rect(position.x, position.y, position.width, position.height / 2),
                label, Mathf.Max(0, property.intValue));
            EditorGUI.LabelField(
                new Rect(position.x, position.y+position.height / 2,position.width, position.height / 2),
                TimeConverter(property.intValue));
        }
        else
        {
            EditorGUI.HelpBox(position, "类型必须为Int", MessageType.Error);
        }
    }

    private string TimeConverter(int num)
    {
        if (attribute is TimeAttribute time)
        {
            if (time.DisplayHours)
            {
                var hours = num / 3600;
                var minutes = num % 3600 / 60;
                var seconds = num % 60;
                return $"{hours}:{minutes.ToString().PadLeft(2, '0')}:{seconds.ToString().PadLeft(2, '0')}";
            }
            else
            {
                var minutes = num % 3600 / 60;
                var seconds = num % 60;
                return $"{minutes.ToString().PadLeft(2, '0')}:{seconds.ToString().PadLeft(2, '0')}";
            }
        }

        return string.Empty;
    }
}

3.对脚本自定义

[CustomEditor(typeof(TimeTest))]
[CanEditMultipleObjects]
public class TimeInspectorEditor : Editor
{
    private SerializedProperty _serializedA;
    private SerializedProperty _serializedB;
    private SerializedProperty _serializedC;
    private void OnEnable()
    {
        _serializedA = serializedObject.FindProperty("a");
        _serializedB = serializedObject.FindProperty("b");
        _serializedC = serializedObject.FindProperty("c");
    }

    public override void OnInspectorGUI()
    {
        serializedObject.Update();

        GUILayout.BeginVertical("box");
        {
            EditorGUILayout.PropertyField(_serializedA);
            EditorGUILayout.PropertyField(_serializedB);
            EditorGUILayout.PropertyField(_serializedC);
        }
        GUILayout.EndVertical();
        
        serializedObject.ApplyModifiedProperties();
    }
}

4.测试脚本

public class TimeTest : MonoBehaviour
{
    [Time] public int a = 3900;
    [Time(true)] public int b = 9000;
    [Time] public float c = 3900f;
}

5.实现效果