| Name | engine module | function description | frequency of use |
|---|---|---|---|
| NoExport | UHT | Specifies that UHT should not be used to automatically generate registration code, but should only perform lexical analysis to extract metadata. | ☠️ |
| Intrinsic | UHT | Indicates that UHT will not generate any code for this class at all, and it must be written manually. | ☠️ |
| Interface | UHT | Indicates that this class is an interface. | ☠️ |
| UCLASS() | UHT | The default behavior of leaving it blank is that it cannot be inherited in blueprints, variables cannot be defined in blueprints, but it retains reflection capabilities. | ★★★★★ |
| Without_UCLASS | UHT | Functions as an ordinary C++ object without reflection capabilities. | ★ |
| CustomThunkTemplates | UHT | Specifies the struct that contains the CustomThunk implementations | ☠️ |
| CustomConstructor | UHT | Prevents the automatic generation of constructor declarations. | ☠️ |
| CustomFieldNotify | UHT | Prevents UHT from generating code related to FieldNotify for this class. | ☠️ |
| Name | engine module | function description | frequency of use |
|---|---|---|---|
| Blueprintable | Blueprint | Can be inherited in blueprints and can also be used as a variable type implicitly | ★★★★★ |
| NotBlueprintable | Blueprint | Cannot be inherited in blueprints and its implicit use cannot be as a variable | ★★★★ |
| BlueprintType | Blueprint | Can be used as a variable type | ★★★★★ |
| NotBlueprintType | Blueprint | Cannot be used as a variable type | ★★★★ |
| Abstract | Blueprint | Designates this class as an abstract base class, which can be inherited but objects cannot be instantiated from it. | ★★★★★ |
| Const | Blueprint | Indicates that the internal properties of this class are not modifiable in blueprints; they are read-only and not writable. | ★★★ |
| ShowFunctions | Blueprint | Re-enables certain functions in the subclass's function override list. | ★★ |
| HideFunctions | Blueprint | Hides certain functions in the subclass's function override list. | ★★ |
| SparseClassDataType | Blueprint | Allows some repetitive and unchanging data of Actors to be stored in a common structure to reduce content usage | ★★★ |
| NeedsDeferredDependencyLoading | Blueprint | ☠️ |
| Name | engine module | function description | frequency of use |
|---|---|---|---|
| MinimalAPI | DllExport | Does not export the class's functions to the DLL, only exports type information as variables. | ★★★ |
| Name | engine module | function description | frequency of use |
|---|---|---|---|
| ClassGroup | Category | Specifies the grouping for components in the Actor's AddComponent panel and in the blueprint's right-click menu. | ★★★ |
| ShowCategories | Category | Displays certain Category properties in the class's ClassDefaults property panel. | ★★★ |
| HideCategories | Category | Hides certain Category properties in the class's ClassDefaults property panel. | ★★★★ |
| CollapseCategories | Category | Hides all properties with Category in the class's property panel, but only for properties with multiple nested Categories. | ★★ |
| DontCollapseCategories | Category | Invalidates the CollapseCategories specifier inherited from the base class. | ★★ |
| AutoExpandCategories | Category | Specifies the Category that should be automatically expanded for this class's objects in the details panel. | ★ |
| AutoCollapseCategories | Category | The AutoCollapseCategories specifier invalidates the effect of the AutoExpandCategories specifier for categories listed on the parent class. | ★ |
| DontAutoCollapseCategories | Category | Invalidates the AutoCollapseCategories specifier for the listed categories inherited from the parent class. | ★ |
| PrioritizeCategories | Category | Prioritizes the display of the specified attribute directory at the front of the details panel. | ★★★ |
| ComponentWrapperClass | Category | Designates this class as a simple encapsulation class, ignoring the Category-related settings of the subclass. | ★★ |
| AdvancedClassDisplay | Category | Displays all properties under this class in the advanced directory by default | ★★★★ |
| Name | engine module | function description | frequency of use |
|---|---|---|---|
| HideDropDown | TypePicker | Hides this class in the class selector | ★★ |
| Name | engine module | function description | frequency of use |
|---|---|---|---|
| Deprecated | Development | Indicates that this class is deprecated. | ★★★ |
| Experimental | Development | Indicates that this class is an experimental version, currently without documentation, and may be deprecated in the future. | ★★★ |
| EarlyAccessPreview | Development | Indicates that this class is a preliminary preview version, more complete than the experimental version, but not yet at the product level. | ★★★ |
| Name | engine module | function description | frequency of use |
|---|---|---|---|
| Within | Instance | Specifies that when an object is created, it must depend on an object with the OuterClassName as its Outer. | ★★★ |
| DefaultToInstanced | Instance | Specifies that all instance properties of this class are set to UPROPERTY(instanced) by default, meaning they create new instances rather than references to objects. | ★★★★ |
| EditInlineNew | Instance | Allows objects of this class to be created inline directly in the property details panel, coordinating with the attribute's Instanced setting. | ★★★★★ |
| NotEditInlineNew | Instance | Cannot be created using the EditInline button | ★ |
| Name | engine module | function description | frequency of use |
|---|---|---|---|
| NotPlaceable | Scene | Indicates that this Actor cannot be placed in a level | ★★★ |
| Placeable | Scene | Indicates that this Actor can be placed in a level. | ★★★ |
| ConversionRoot | Scene | Allows the Actor to be converted between itself and its subclasses in the scene editor | ★ |
| Name | engine module | function description | frequency of use |
|---|---|---|---|
| Config | Config | Specifies the name of the configuration file to which the object's values are saved in the ini configuration file. | ★★★★★ |
| PerObjectConfig | Config | In cases where there is already a config file name, specifies that values should be stored per object instance rather than per class. | ★★★★★ |
| ConfigDoNotCheckDefaults | Config | Specifies that the consistency check of the previous level's configuration values is ignored when saving configuration values. | ★ |
| DefaultConfig | Config | Specifies that the configuration file level to save to is Project/Config/DefaultXXX.ini. | ★★★ |
| GlobalUserConfig | Config | Specifies that the configuration file level to save to is Engine/Config/UserXXX.ini for global user settings. | ★★★ |
| ProjectUserConfig | Config | Specifies that the configuration file level to save to is Project/Config/UserXXX.ini for project user settings. | ★★★ |
| EditorConfig | Config | Used to save information in the editor state. | ★ |
| Name | engine module | function description | frequency of use |
|---|---|---|---|
| Transient | Serialization | Specifies that all objects of this class are skipped during serialization. | ★★★ |
| NonTransient | Serialization | Invalidates the Transient specifier inherited from the base class. | ★★★ |
| Optional | Serialization | Mark this class's objects as optional, allowing them to be ignored during Cooking. | ★ |
| MatchedSerializers | Serialization | Specifies that the class supports text structure serialization | ☠️ |