如何从另一个类 LaunchCharacter答案

【问题标题】：How to LaunchCharacter from another class如何从另一个类 LaunchCharacter
【发布时间】：2019-10-24 14:06:23
【问题描述】：

我创建了一个 LaunchPad actor C++ 类，它由一个 Cube 静态网格组件和一个 UBox 组件编译而成。到目前为止，一旦角色与命中框重叠，它就会触发 ALaunchPad::OnBoxBeginOverlap 内的任何内容。我目前正试图告诉当角色与 UBox 重叠时，将它们在空中启动，类似于蓝图的“LaunchCharacter”节点。

LaunchPad.cpp

void ALaunchPad::OnBoxBeginOverlap(UPrimitiveComponent*  OverlappedComp, AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult) 
{
    GEngine->AddOnScreenDebugMessage(-1, 15.0f, FColor::Yellow, TEXT("Character Launched!"));
    Asgd240_1115350_core5Character::LaunchCharacter(FVector(0, 0, velocity), false, true);

}

LaunchPad.h

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

#pragma once

#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "LaunchPad.generated.h"


UCLASS()
class SGD240_1115350_CORE5_API ALaunchPad : public AActor
{
    GENERATED_BODY()

public: 
    // Sets default values for this actor's properties
    ALaunchPad();

protected:
    // Called when the game starts or when spawned
    virtual void BeginPlay() override;

public: 
    // Called every frame
    virtual void Tick(float DeltaTime) override;

    void OnBoxBeginOverlap(UPrimitiveComponent * HitComp, AActor * OtherActor, UPrimitiveComponent * OtherComp, FVector NormalImpulse, const FHitResult & Hit);

    UPROPERTY(VisibleAnywhere)
    class UBoxComponent* Collide;

    UFUNCTION()
    void OnBoxBeginOverlap(UPrimitiveComponent* OverlappedComp, AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult);

    UPROPERTY(EditAnywhere)
        float velocity;

    UFUNCTION()
        void LaunchCharacter();

};

目前我收到一个'非静态成员引用必须是相对于特定对象的，它不会编译。有什么想法吗？

【问题讨论】：

标签： c++ unreal-engine4

【解决方案1】：

将OtherActor 转换为ACharacter，然后调用其LaunchCharacter 方法：

void ALaunchPad::OnBoxBeginOverlap(UPrimitiveComponent*  OverlappedComp, AActor* OtherActor, 
        UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, 
        const FHitResult& SweepResult) 
{
    GEngine->AddOnScreenDebugMessage(-1, 15.0f, FColor::Yellow, TEXT("Character Launched!"));

    ACharacter* OtherCharacter = Cast<ACharacter>(OtherActor);
    if (OtherCharacter != nullptr)
    {
        OtherCharacter->LaunchCharacter(FVector(0, 0, velocity), false, true);
    }

}

【讨论】：