UE4 loadingscreen dynamic loading startup animation

One UE4 Load mode of

When switching levels , Often because the level resources are too large , Create a Caton , Black screen , That is because the main thread is blocked due to excessive resources , Cause the interface to go blank and get stuck , If you use streamingLevel Loaded loading The way , Still unable to fundamentally solve the thread blocking problem , It needs to be used at this time UE4 Preloading process of , To start a separate thread to solve this problem .

Two Load the structure of the properties that the screen will have FLoadingScreenAttributes

FLoadingScreenAttributes LoadingScreen;

 LoadingScreen.bAutoCompleteWhenLoadingCompletes = false;// Whether to play all movies and finish loading , The load screen will disappear
LoadingScreen.bWaitForManualStop = false;// Whether to play all the time movies, Until the manual stop LoadingScreen.bMoviesAreSkippable = false;// Whether loading is complete , Skip the movie by clicking on the load screen

 LoadingScreen.MinimumLoadingScreenDisplayTime = 3.0f; // movie Minimum playback time
 LoadingScreen.PlaybackType = EMoviePlaybackType::MT_Looped;// Whether to circulate

3、 ... and Code operation

One 、 establish C++ class ,GameInstance

  Two 、 In your project Build.cs Add modules to

"HeadMountedDisplay",
            "MoviePlayer",
            "UMG", "Slate", "SlateCore"

 

  3、 ... and 、 stay MyGameInstance.h In file

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

#pragma once

#include "CoreMinimal.h"
#include "Engine/GameInstance.h"
#include "Runtime/UMG/Public/UMG.h"
#include "Runtime/UMG/Public/UMGStyle.h"
#include "Runtime/UMG/Public/Slate/SObjectWidget.h"
#include "Runtime/UMG/Public/IUMGModule.h"
#include "Runtime/UMG/Public/Blueprint/UserWidget.h"
#include "Runtime/MoviePlayer/Public/MoviePlayer.h"
#include "Runtime/SlateCore/Public/Widgets/SWidget.h"
#include "MyGameInstance.generated.h"

/**
 * 
 */
UCLASS()
class LOADINGSCREEN_API UMyGameInstance : public UGameInstance
{
	GENERATED_BODY()
public:
	virtual void Init() override;

	UFUNCTION()
		virtual void BeginLoadingScreen(const FString& MapName);
	UFUNCTION()
		virtual void EndLoadingScreen(UWorld* LoadedWorld);

	UPROPERTY()
		UUserWidget* CurrentWidget;
	// loading widget
	UPROPERTY(EditAnywhere, BlueprintReadOnly, Category = "UMGGame")
		TSubclassOf<UUserWidget> LoadingWidget;

};

    Four 、 stay MyGameInstance.cpp In file

 

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


#include "MyGameInstance.h"

void UMyGameInstance::Init()
{
    Super::Init();

    FCoreUObjectDelegates::PreLoadMap.AddUObject(this, &UMyGameInstance::BeginLoadingScreen);
    FCoreUObjectDelegates::PostLoadMapWithWorld.AddUObject(this,&UMyGameInstance::EndLoadingScreen);
}

void UMyGameInstance::BeginLoadingScreen(const FString& MapName)
{
	FLoadingScreenAttributes LoadingScreen;

	LoadingScreen.bAutoCompleteWhenLoadingCompletes = false;// Whether to play all movies and finish loading , The load screen will disappear 
	LoadingScreen.bWaitForManualStop = false;// Whether to play all the time movies, Until the manual stop 
	LoadingScreen.bMoviesAreSkippable = false;// Whether loading is complete , You can skip the movie by clicking the load screen 
	LoadingScreen.MinimumLoadingScreenDisplayTime = 3.0f; // movie Minimum playback time 
	//LoadingScreen.PlaybackType = EMoviePlaybackType::MT_Looped;

	LoadingScreen.WidgetLoadingScreen = FLoadingScreenAttributes::NewTestLoadingScreenWidget(); // movie When there is no , According to the widget

	if (LoadingWidget != nullptr)
	{
		CurrentWidget = CreateWidget<UUserWidget>(this, LoadingWidget);
		TSharedPtr<SWidget> LoadScreen = CurrentWidget->TakeWidget();
		LoadingScreen.WidgetLoadingScreen = LoadScreen;
	}
	else
	{
		UE_LOG(LogTemp, Warning, TEXT("LoadingWidget == nullptr"));
	}
	//LoadingScreen.MoviePaths.Add("squad_intro_movie");
	GetMoviePlayer()->SetupLoadingScreen(LoadingScreen);
}

void UMyGameInstance::EndLoadingScreen(UWorld* LoadedWorld)
{
	UE_LOG(LogTemp,Warning,TEXT("LoadSuccess"));
	GetMoviePlayer()->StopMovie();
}

    5、 ... and 、 Set the project settings in the blueprint , establish Gameinstance The blueprint

  Set up

    6、 ... and 、 establish widget, As GameInstance Medium for loading widget

 

  Finally, compile and run ：

  Refer to official documentation ：https://docs.unrealengine.com/5.0/en-US/API/Runtime/MoviePlayer/FLoadingScreenAttributes/