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 //UE4打印输出日志
		GEngine->AddOnScreenDebugMessage(-1, 5.0f, FColor::Red, TEXT("123"));

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//打印字符串
FString mystring = "1234";
GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Red, FString::Printf(TEXT("string : %s"), *mystring));

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//打印浮点型变量
float Health = 5.0f;
GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Red, FString::Printf(TEXT("Health is : %f"), Health));

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//打印整型型变量
int32 Number = 5;
GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Red, FString::Printf(TEXT("Number is : %d"), Number));

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DECLARE_LOG_CATEGORY_EXTERN(YourLog, Log, All);

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UE_LOG(YourLog,Warning,TEXT("This is a message to yourself during runtime!"));

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//灰色
UE_LOG(LogTemp,Log,TEXT("This is grey text!"));
//黄色
UE_LOG(LogTemp,Warning,TEXT("This is yellow text!"));
//红色
UE_LOG(LogTemp,Error,TEXT("This is red text!"));

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UE_LOG(YourLog,Warning,TEXT("MyCharacter's Name is %s"), *MyCharacter->GetName() );

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UE_LOG(YourLog,Warning,TEXT("MyCharacter's Health is %d"), MyCharacter->Health );

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UE_LOG(YourLog,Warning,TEXT("MyCharacter's Health is %f"), MyCharacter->Health );

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UE_LOG(YourLog,Warning,TEXT("MyCharacter's Location is %s"), 
    *MyCharacter->GetActorLocation().ToString());

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UE_LOG(YourLog,Warning,TEXT("MyCharacter's FName is %s"), 
    *MyCharacter->GetFName().ToString());