基于C++代码的UE4学习（十一）—— 创建UserWidget（1）

2021-04-20 00:31

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标签：学习 override 文件 virtual form creat viewport setting game

我们先创建一个UserWidget的蓝图，起名BP_Widget。

技术图片

在我们的Widget蓝图中添加一个Button,并为Button添加一个Click的方法。

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方法很简单，当Button被按下的时候，打印"Hello Widget"即可。

技术图片

创建一个继承自Actor类的自定义类，用于读取和创建UserWidget类的实例。

头文件如下：

 1 // Fill out your copyright notice in the Description page of Project Settings.
 2 
 3 #pragma once
 4 
 5 #include "CoreMinimal.h"
 6 #include "GameFramework/Actor.h"
 7 #include "WidgetActor.generated.h"
 8 
 9 UCLASS()
10 class MYPROJECT2_API AWidgetActor : public AActor
11 {
12     GENERATED_BODY()
13     
14 public:    
15     // Sets default values for this actor‘s properties
16     AWidgetActor();
17 
18 protected:
19     // Called when the game starts or when spawned
20     virtual void BeginPlay() override;
21 
22 public:    
23     // Called every frame
24     virtual void Tick(float DeltaTime) override;
25 
26 public:
27     UPROPERTY(EditAnywhere,BlueprintReadWrite,Category="UI")
28     TSubclassOf widgetChoice;
29 
30 
31     UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "UI")
32     class UStaticMeshComponent* myStaticMesh;
33 };

源文件如下：

 1 // Fill out your copyright notice in the Description page of Project Settings.
 2 
 3 
 4 #include "WidgetActor.h"
 5 #include "Blueprint/UserWidget.h"
 6 
 7 // Sets default values
 8 AWidgetActor::AWidgetActor()
 9 {
10      // Set this actor to call Tick() every frame.  You can turn this off to improve performance if you don‘t need it.
11     PrimaryActorTick.bCanEverTick = true;
12 
13 
14 }
15 
16 // Called when the game starts or when spawned
17 void AWidgetActor::BeginPlay()
18 {
19     Super::BeginPlay();
20 
21 
22     if (widgetChoice) {
23         UUserWidget* myWidget = CreateWidget(GetWorld(), widgetChoice);
24         if (myWidget) {
25             myWidget->AddToViewport();
26             GetWorld()->GetFirstPlayerController()->bShowMouseCursor = true;
27         }
28     }
29     
30 }
31 
32 // Called every frame
33 void AWidgetActor::Tick(float DeltaTime)
34 {
35     Super::Tick(DeltaTime);
36 
37 }