[游戏开发]【UE4基础】如何在C++中访问蓝图中的变量之方法二

接上篇，本篇使用第二种方法来访问UMG中Widget变量，主要使用的方法是添加标签：

UPROPERTY(meta = (BindWidget))

步骤

第一步

添加继承于UUserWidget的C++类

头文件：SessionRow.h

#pragma once

#include "CoreMinimal.h"
#include "Blueprint/UserWidget.h"
#include "SessionRow.generated.h"

/**
 * 
 */
UCLASS()
class STEAMDEMO_API USessionRow : public UUserWidget
{
	GENERATED_BODY()

public:
	UPROPERTY(meta = (BindWidget))
	class UTextBlock* ServerName;

	UPROPERTY(meta = (BindWidget))
	class UTextBlock* HostUser;

	UPROPERTY(meta = (BindWidget))
	class UTextBlock* ConnectionFraction;

	UPROPERTY(BlueprintReadOnly)
	bool Selected = false;

	void Setup(class UMainMenu* Parent, uint32 Index);

private:
	UPROPERTY(meta = (BindWidget))
	class UButton* RowButton;

	UPROPERTY()
	class UMainMenu* Parent;

	uint32 Index = -1;

	UFUNCTION()
	void OnClicked();
	
};

cpp文件：SessionRow.cpp

#include "SessionRow.h"
#include "MainMenu.h"
#include "Components/Button.h"
#include "Components/TextBlock.h"

void USessionRow::Setup(UMainMenu* InParent, uint32 InIndex)
{
	Parent = InParent;
	Index = InIndex;

	RowButton->OnClicked.AddDynamic(this, &USessionRow::OnClicked);
}

void USessionRow::OnClicked()
{
	if (Parent == nullptr) return;

	UE_LOG(LogTemp, Warning, TEXT("[USessionRow::OnClicked] Index %i"), Index);

	Parent->SelectIndexSessionList(Index);
}

第二步

创建Widget蓝图类WBP_SessionRow，继承于第一步创建的C++类Session Row

注意点：Widget蓝图类中的控件名称需要与C++类中的变量名保持一致才能绑定上。

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