【UE4】异步加载关卡 LoadingScreen ( 蓝图和C++ )

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一般先跳转到一个临时的关卡，然后异步加载目标关卡，同时展示Loading界面
对于含有流关卡的目标关卡，可以先载入子关卡

蓝图异步加载

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C++ 异步加载关卡

LoadPackageAsync

bool bIsLoaded;UPROPERTY() FString LoadPackagePath;// 用于加载完成的回调 DECLARE_DYNAMIC_DELEGATE(FOnAsyncLoadFinished);UFUNCTION(BlueprintCallable) void MyAsyncLoad(const FOnAsyncLoadFinished& OnAsyncLoadFinished);UFUNCTION(BlueprintCallable) float GetLoadProgress();

//开始异步加载 void ALoadActor::MyAsyncLoad(const FOnAsyncLoadFinished& OnAsyncLoadFinished) { //不使用GetBaseFilename，编译 error C4458: LoadPackageAsync failed to begin to load a package··· LoadPackagePath = FPaths::GetBaseFilename(LoadPackageSoftObjectPath.ToString(), false);bIsLoaded = false;UE_LOG(LogTemp, Warning, TEXT("String: %s"), *LoadPackagePath); LoadPackageAsync( LoadPackagePath, FLoadPackageAsyncDelegate::CreateLambda([=](const FName& PackageName, UPackage* LoadedPackage, EAsyncLoadingResult::Type Result) { if (Result == EAsyncLoadingResult::Failed) { UE_LOG(LogTemp, Warning, TEXT("Load Failed")); } else if (Result == EAsyncLoadingResult::Succeeded) { bIsLoaded = true; UE_LOG(LogTemp, Warning, TEXT("Load Succeeded")); OnAsyncLoadFinished.ExecuteIfBound(); } }), 0, PKG_ContainsMap); }//获取加载的进度 -1 —— 100 float ALoadActor::GetLoadProgress() { float FloatPercentage = GetAsyncLoadPercentage(*LoadPackagePath); if (!bIsLoaded) { FString ResultStr = FString::Printf(TEXT("Percentage: %f"), FloatPercentage); GEngine->AddOnScreenDebugMessage(-1, 2.0f, FColor::Green, ResultStr); UE_LOG(LogTemp, Warning, TEXT("Percentage: %f"), FloatPercentage); } else { FloatPercentage = 100; } return FloatPercentage; }