Open Level

说明

在游戏结束窗口添加按钮, 点击则重启关卡

API导航

UserWidget

1. 初始化时调用
   

   Copy1virtual bool Initialize();

   Copy 1bool UUserWidget::Initialize()
    2{
    3    // If it's not initialized initialize it, as long as it's not the CDO, we never initialize the CDO.
    4    if (!bInitialized && !HasAnyFlags(RF_ClassDefaultObject))
    5    {
    6        // If this is a sub-widget of another UserWidget, default designer flags and player context to match those of the owning widget
    7        if (UUserWidget* OwningUserWidget = GetTypedOuter<UUserWidget>())
    8        {
    9#if WITH_EDITOR
   10            SetDesignerFlags(OwningUserWidget->GetDesignerFlags());
   11#endif
   12            SetPlayerContext(OwningUserWidget->GetPlayerContext());
   13        }
   14
   15        UWidgetBlueprintGeneratedClass* BGClass = Cast<UWidgetBlueprintGeneratedClass>(GetClass());
   16        // Only do this if this widget is of a blueprint class
   17        if (BGClass)
   18        {
   19            BGClass->InitializeWidget(this);
   20        }
   21        else
   22        {
   23            InitializeNativeClassData();
   24        }
   25
   26        if ( WidgetTree == nullptr )
   27        {
   28            WidgetTree = NewObject<UWidgetTree>(this, TEXT("WidgetTree"), RF_Transient);
   29        }
   30        else
   31        {
   32            WidgetTree->SetFlags(RF_Transient);
   33
   34            InitializeNamedSlots();
   35        }
   36
   37        if (!IsDesignTime() && PlayerContext.IsValid())
   38        {
   39            NativeOnInitialized();
   40        }
   41
   42        bInitialized = true;
   43        return true;
   44    }
   45
   46    return false;
   47}

2. 在Initialize最后调用
   
   不用考虑自定义操作与调用基类Initialize的先后顺序
   

   Copy1virtual void NativeOnInitialized();

GameplayStatics

1. 重启关卡
   
   会重新创建对象, 重置定时器等
   

   被称作硬重启 Hard Reset
   

   Copy1/**
   2​ * Travel to another level
   3 *
   4​ * @param	LevelName			the level to open
   5​ * @param	bAbsolute			if true options are reset, if false options are carried over from current level
   6​ * @param	Options				a string of options to use for the travel URL
   7 */
   8UFUNCTION(BlueprintCallable, meta=(WorldContext="WorldContextObject", AdvancedDisplay = "2", DisplayName = "Open Level (by Name)"), Category="Game")
   9static void OpenLevel(const UObject* WorldContextObject, FName LevelName, bool bAbsolute = true, FString Options = FString(TEXT("")));

2. 获取当前关卡名
   

   Copy1/**
   2​ * Get the name of the currently-open level.
   3 *
   4​ * @param bRemovePrefixString	remove any streaming- or editor- added prefixes from the level name.
   5 */
   6UFUNCTION(BlueprintCallable, meta = (WorldContext = "WorldContextObject", AdvancedDisplay = "1"), Category = "Game")
   7static FString GetCurrentLevelName(const UObject* WorldContextObject, bool bRemovePrefixString = true);

GameModeBase

被称作软重启 Soft Reset , 默认会对场景中的所有Actor调用Reset, 同时也留有自由操作空间. 我们可以不用重新创建所有对象

Copy1/**
2 * Overridable function called when resetting level. This is used to reset the game state while staying in the same map
3 * Default implementation calls Reset() on all actors except GameMode and Controllers
4 */
5UFUNCTION(BlueprintCallable, Category=Game)
6virtual void ResetLevel();

在STUGameOverWidget中添加重启逻辑

添加属性: 按钮

ShootThemUp: UI/STUGameOverWidget.h

Copy1class UButton;
2
3UPROPERTY(meta = (BindWidget))
4UButton *ResetLevelButton;

添加按钮点击时回调函数

private

ShootThemUp: UI/STUGameOverWidget.h

Copy1UFUNCTION()
2void OnResetLevel();

ShootThemUp: UI/STUGameOverWidget.cpp

Copy1#include "Kismet/GameplayStatics.h"
2#include "Components/Button.h"
3
4void USTUGameOverWidget::OnResetLevel()
5{
6    const auto CurrentLevelName = UGameplayStatics::GetCurrentLevelName(GetWorld()); /* DefaultMap */
7
8    UGameplayStatics::OpenLevel(GetWorld(), FName(CurrentLevelName));
9}

覆写NativeOnInitialized

protected

ShootThemUp: UI/STUGameOverWidget.h

Copy1virtual void NativeOnInitialized() override;

可以把所有Initialize替换成NativeOnInitialized, 不作演示

ShootThemUp: UI/STUGameOverWidget.cpp

Copy1void USTUGameOverWidget::NativeOnInitialized()
2{
3    Super::NativeOnInitialized();
4
5    if (ResetLevelButton)
6    {
7        ResetLevelButton->OnClicked.AddDynamic(this, &USTUGameOverWidget::OnResetLevel);
8    }
9}

修改WBP_GameOverWidget

1. 修改WBP_PauseWidget: 鼠标悬浮在按钮之上时的光标图形
   

   

   
   

2. 拷贝WBP_PauseWidget中按钮所属大小盒
   

   

   
   

3. 添加分隔符
   

   

   
   

4. 粘贴大小盒
   

   

   
   

   这里出现了问题, 粘贴得到的是按钮
   

   修改文本
   

   

   
   

   修改按钮变量名
   

   

   
   

查看

鼠标悬浮在按钮上时, 可以看见手形光标

可以正常重启关卡