打印到屏幕

• 默认打印屏幕

// 打印至屏幕
FString screenMessage = "(AddOnScreenDebugMessage)    Hello world!";
GEngine->AddOnScreenDebugMessage(-1, 1.f, FColor::Green, screenMessage);

// 打印至屏幕
UKismetSystemLibrary::PrintString(this, "(UKismetSystemLibrary::PrintString)   Hello world!");

输出log

• 默认类别打印log

UE_LOG(LogTemp, Log, TEXT("(UE_LOG-logTemp)    Hello world!"));

• 自定义类别打印log

// .h 自定义日志分类
DECLARE_LOG_CATEGORY_CLASS(GMDebugLog, Log, All);

// .cpp 输出日志 自定义分类
UE_LOG(GMDebugLog, Warning, TEXT("(UE_LOG-logTemp)    Hello world!"));
UE_LOG(GMDebugLog, Error, TEXT("(UE_LOG-GMDebugLog)    Hello world!"));

• 带变量打印log 

	
//创建FString 变量 FString::Printf
FString playerName = "User";
int32 healthValue = 100;
FString outputMessage1 = FString::Printf(TEXT("Name is %s, health value is %d"), *playerName, healthValue);
UE_LOG(LogTemp, Warning, TEXT("FStringFormatArg: %s"), *outputMessage1);

//创建FString变量 FString::Format
TArray<FStringFormatArg> args;
args.Add(FStringFormatArg(playerName));
args.Add(FStringFormatArg(healthValue));

FString outputMessage2 = FString::Format(TEXT("Name is {0}, health value is  {1}"), args);
UE_LOG(LogTemp, Warning, TEXT("FString::Format: %s"), *outputMessage2);

参考：【UE4 C++】打印字符串与输出日志 - 砥才人 - 博客园 (cnblogs.com)

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