Unreal Engine C++ Useful Property Specifiers Basics

 

How To be Edit Variables in Properties windows ;

Some times we need to edit our properties from editor window (Properties Window of Actor or Pawn) without touch C++ code or class.

UPROPERTY(EditAnywhere , Category = "Category name")                                                                                          float ForwadForce = 2000.0f; // we edit this property in editor 

Unreal Engine Gives you Power to change without code;

Expose Variable's in Blueprint

Declare a variable in C++ class and call it from Blueprint;

Multicast Delegates only. Property should be exposed for calling in Blueprint code ;

UPROPERTY(BlueprintCallable)
float defalutHealth; // Blueprint Class the Value is Expose and we change it;

Expose but Read Only and Read-Write

Simply mean don't change the value but Blueprint class Expose it only;

UPROPERTY(BlueprintReadOnly)
int32 Point = 10; // the value is don't changing in Blueprint Class 

 UPROPERTY(BlueprintReadWrite)
 bool isGameOver = false; // we call it and write value

// Note : Not call in same UPROPERTY these two  Property Specifiers;

Showing All Properties but did not changes

We want to showing all properties don't changes or change it;

 UPROPERTY( VisibleAnywhere )
 UStatciMeshComponent* StaticMesh; // all properties showing in Properties window but don't edited 
// Note :  This Specifier is incompatible with the "Edit" Specifiers 

Call C++ Function In Blueprint

We made a function in C++ code or class. Now we want to call it from C++ class to Blueprint how to be that? Unreal Engine gives kinds of MACROS so we can easily call a specif function.

 UFUNCTION ( BlueprintCallable , Category = "Category Name")
  float GetScore(float getScore); // if we call it in blueprint we can do 

BlueprintCallable Functions

BlueprintCallable and BlueprintPure

The Main BlueprintCallable have a Execution Pin and BlueprintPure Dont have the used directly uses to object.

How to Override or Default Functions

So we made games and defiantly creating functions but some time we need to override functions C++ code or Blueprint like we want to same class to use our Hit or Overlap functions but we need to call it only in C++. How to works same in C++ and Blueprint??

Call MACRO BlueprintNativeEvent this is gives you ability to gives you override to blueprint functions;

This function is designed to be overridden by a Blueprint

 UFUNCTION(BlueprintNativeEvent, Category="Tile Functions") 
void OnOverlapBegin(class UPrimitiveComponent* OverlappedComp, class AActor* OtherActor, class UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult);  // blueprint native event now blueprint call it and define works!!

 void OnOverlapBegin  _Implementation (class UPrimitiveComponent* OverlappedComp, class AActor* OtherActor, class UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult);  // native event we call it c++ and make it useful 

More Simple! > NativeEvent gives you ability call function and works with it same functions name;

More think You can use two types of Overlap Trigger's that's power of Blueprint And C++; Like C++ onOverlapBegin() function gives Effects and Blueprint onOverlapBegin() function gives you sound's of Walking or anything you definitions;

More On Unreal Engine Docs;

UPROPERY In Unreal Engine;

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