Custom PropertyDrawer to support the Flag is not change value.

public class EnumFlagAttribute : PropertyAttribute { public string enumName; public System.Type enumType;

 public EnumFlagAttribute() {}
 
 public EnumFlagAttribute(string name)
 {
     enumName = name;
 }

 public EnumFlagAttribute(System.Type type)
 {
     enumType = type;
 }

}

[CustomPropertyDrawer(typeof(EnumFlagAttribute))] public class EnumFlagDrawer : PropertyDrawer
{ public override void OnGUI(Rect position, SerializedProperty property, GUIContent label) { EnumFlagAttribute flagSettings = (EnumFlagAttribute)attribute; System.Enum targetEnum = GetBaseProperty (property);

     string propName = flagSettings.enumName;
     if (string.IsNullOrEmpty(propName))
         propName = property.name;
     
     EditorGUI.BeginProperty(position, label, property);
     System.Enum enumNew = EditorGUI.EnumMaskField(position, propName, targetEnum);
     property.intValue = (int) System.Convert.ChangeType(enumNew, targetEnum.GetType());
     EditorGUI.EndProperty();
 }
 
 static T GetBaseProperty<T>(SerializedProperty prop)
 {
     string[] separatedPaths = prop.propertyPath.Split('.');

     System.Object reflectionTarget = prop.serializedObject.targetObject as object;

     foreach (var path in separatedPaths)
     {
         FieldInfo fieldInfo = reflectionTarget.GetType().GetField(path);
         reflectionTarget = fieldInfo.GetValue(reflectionTarget);
     }
     return (T) reflectionTarget;
 }

}

[System.Flags] public enum TeamFlagType { A_TEAM = (1 << 0), B_TEAM = (1 << 1), C_TEAM = (1 << 2), D_TEAM = (1 << 3), E_TEAM = (1 << 4), F_TEAM = (1 << 5), G_TEAM = (1 << 6), H_TEAM = (1 << 7), I_TEAM = (1 << 8), J_TEAM = (1 << 9) }

[SerializeField, EnumFlag(typeof(TeamFlagType))] public TeamFlagType TeamFlag;

I'm using 5.3.7 now.

when I used 5.3.4, this PropertyDrawer worked fine. but PropertyDrawer is not change value after I version up to 5.3.6 and 5.3.7.

what should I do?