UE常见变量并且在【细节面板】中进行修改

1. 在UE4中新建一个C++类：TestActor，继承子Actor ,UE4会自动在类的前面添加上大写字母A,最后生成的类是：ATestActor;
   
2. 在UE4的内容面板中会出现新建Actor对象
   
   在VS2019编辑器中，会出现对应的类：TestActor.h和TestActor.cpp
   
   TestActor.h

// Fill out your copyright notice in the Description page of Project Settings.

#pragma once

#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "TestActor.generated.h"

UCLASS()
class FIRSTPROJECT_API ATestActor : public AActor
{
	GENERATED_BODY()
	
public:	
	// Sets default values for this actor's properties
	ATestActor();

protected:
	// Called when the game starts or when spawned
	virtual void BeginPlay() override;

public:	
	// Called every frame
	virtual void Tick(float DeltaTime) override;

};
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TestActor.cpp

// Fill out your copyright notice in the Description page of Project Settings.


#include "TestActor.h"

// Sets default values
ATestActor::ATestActor()
{
 	// Set this actor to call Tick() every frame.  You can turn this off to improve performance if you don't need it.
	PrimaryActorTick.bCanEverTick = true;

}

// Called when the game starts or when spawned
void ATestActor::BeginPlay()
{
	Super::BeginPlay();
	
}

// Called every frame
void ATestActor::Tick(float DeltaTime)
{
	Super::Tick(DeltaTime);

}
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3. 在头文件中添加向量变量FVector,并且添加上蓝图属性

	UPROPERTY(EditInstanceOnly, BlueprintReadWrite, Category="MyVars")
	FVector initLocation = FVector(0.0, 0.0, 0.0);
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注：
EditInstanceOnly：只有ATestActor实例化以后才可以编辑
BlueprintReadWrite：可以在蓝图中读写
Category：表示属性类别为"MyVar"

// Fill out your copyright notice in the Description page of Project Settings.

#pragma once

#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "TestActor.generated.h"

UCLASS()
class FIRSTPROJECT_API ATestActor : public AActor
{
	GENERATED_BODY()
	
public:	
	// Sets default values for this actor's properties
	ATestActor();

	UPROPERTY(EditInstanceOnly, BlueprintReadWrite, Category="MyVars")
	FVector initLocation = FVector(0.0, 0.0, 0.0);
protected:
	// Called when the game starts or when spawned
	virtual void BeginPlay() override;

public:	
	// Called every frame
	virtual void Tick(float DeltaTime) override;

};

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4.把新建的TestActor拖拽到场景中，在场景中什么也看不到(之所以看不到是因为没有添加组件)，但是可以在世界面板中看到场景中已经有了一个ATestActor的对象实例。并且在细节面板中可以看到，新定义的变量类型“MyVars”

5.添加组件，并且设置组件是在蓝图中随处可见“VisibleAnywhere”，定义类别：“MyMess”

	UPROPERTY(VisibleAnywhere, Category = "MyMess")
	UStaticMeshComponent* mess = nullptr;
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在构造函数中需要初始化一个对象

mess = CreateDefaultSubobject<UStaticMeshComponent>("TestMess");
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// Fill out your copyright notice in the Description page of Project Settings.

#pragma once

#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "TestActor.generated.h"

UCLASS()
class FIRSTPROJECT_API ATestActor : public AActor
{
	GENERATED_BODY()
	
public:	
	// Sets default values for this actor's properties
	ATestActor();

	UPROPERTY(VisibleAnywhere, Category = "MyMess")
	UStaticMeshComponent* mess = nullptr;

	UPROPERTY(EditInstanceOnly, BlueprintReadWrite, Category="MyVars")
	FVector initLocation = FVector(0.0, 0.0, 0.0);
protected:
	// Called when the game starts or when spawned
	virtual void BeginPlay() override;

public:	
	// Called every frame
	virtual void Tick(float DeltaTime) override;

};

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// Fill out your copyright notice in the Description page of Project Settings.


#include "TestActor.h"

// Sets default values
ATestActor::ATestActor()
{
 	// Set this actor to call Tick() every frame.  You can turn this off to improve performance if you don't need it.
	PrimaryActorTick.bCanEverTick = false;
	mess = CreateDefaultSubobject<UStaticMeshComponent>("TestMess");
}

// Called when the game starts or when spawned
void ATestActor::BeginPlay()
{
	Super::BeginPlay();
	SetActorLocation(initLocation);//开始运行的时候，位置调整到当前位置
}

// Called every frame
void ATestActor::Tick(float DeltaTime)
{
	Super::Tick(DeltaTime);

}
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回到UE4Editor中，把内容面板中中TestActor拖动到场景中，可以在细节面板中可以看到对应的组件信息，并且可以选择不同的静态网格体。

aaa