UE4 C++ UGameInstance实例化

1.创建GameInstance C++类

2.在.h添加变量

class 工程名称_API UMyGameInstance : public UGameInstance
{
	GENERATED_BODY()
	
public:	//定义了三个公开的变量
	UMyGameInstance();
	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "MyGameInstance")
	FString Name;
	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "MyGameInstance")
	float Health;
	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "MyGameInstance")
	int32 Age;
};

3.在.cpp初始化这三个变量值

#include "MyGameInstance.h"

UMyGameInstance::UMyGameInstance()
{
	Name = TEXT("zhangsan");
    Health = 198.4;
    Age = 88;
}

4.接着在其他的文件编写

.h

#include "MyGameInstance.h"	//引用MyGameInstance.h文件，才能引用到MMyGameInstance类里面的内容

UCLASS()
class 工程名称_API A工程名称+类名 : public A基类名
{
//新建一个MyGameInstance类型的指针变量，变量名称为：MyGameInstance
	UPROPERTY()
		UMyGameInstance *MyGameInstance;
}

.cpp

void A工程名称+类名::BeginPlay()
{
	Super::BeginPlay();
	
MyGameInstance = Cast<UMyGameInstance>(GetWorld()->GetGameInstance());
	if(MyGameInstance)
	{
		UE_LOG(LogTemp, Warning, TEXT("MyGameInstance is %s"), *MyGameInstance->GetName());	//注意这里打印的方法，有的带*号
		UE_LOG(LogTemp,Warning, TEXT("MyGameInstance's Name is %s"), *MyGameInstance->Name);
		UE_LOG(LogTemp,Warning, TEXT("MyGameInstance's Health is %f"), MyGameInstance->Health);
		UE_LOG(LogTemp,Warning, TEXT("MyGameInstance's Age is %d"), MyGameInstance->Age);
	}
｝

5.设置GameInstance