1. 新建一个Character C++类

默认包含：

 1 //构造函数
 2 ATheCharacter();
 3 
 4 //开始
 5 virtual void BeginPlay() override;
 6 
 7 //更新
 8 virtual void Tick(float DeltaTime) override;
 9 
10 //输入组件
11 virtual void SetupPlayerInputComponent(class UInputComponent* PlayerInputComponent) override;

2. 绑定相机和弹簧臂

为了能正常看到玩家，需要绑定相机和弹簧臂，弹簧臂绑定在人物胶囊体上，相机绑定在弹簧臂上。

UPROPERTY(VisibleAnywhere)
class USpringArmComponent* SpringArmComp;

UPROPERTY(VisibleAnywhere)
class UCameraComponent* CameraComp;

 1 #include <GameFramework/SpringArmComponent.h>
 2 #include <Camera/CameraComponent.h>
 3 
 4 // Sets default values
 5 ATheCharacter::ATheCharacter()
 6 {
 7      // Set this character to call Tick() every frame.  You can turn this off to improve performance if you don't need it.
 8     PrimaryActorTick.bCanEverTick = true;
 9 
10     SpringArmComp = CreateDefaultSubobject<USpringArmComponent>("SpringArmComp");
11     SpringArmComp->SetupAttachment(RootComponent);
12 
13     CameraComp = CreateDefaultSubobject<UCameraComponent>("CameraComp");
14     CameraComp->SetupAttachment(SpringArmComp);
15 }

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transient property???

Property is transient, meaning it will not be saved or loaded.

Properties tagged this way will be zero-filled at load time.

SetupAttachment 和 AttachToComponent的区别？

都是场景组件的附加方法。前者在构造时调用，后者在游戏中调用。

 3. 添加移动组件

然后让玩家可以走路，转向

1 void ATheCharacter::SetupPlayerInputComponent(UInputComponent* PlayerInputComponent)
2 {
3     Super::SetupPlayerInputComponent(PlayerInputComponent);
4 
5     PlayerInputComponent->BindAxis("MoveForward", this, &ATheCharacter::MoveForward);
6     PlayerInputComponent->BindAxis("Turn", this, &APawn::AddControllerYawInput);
7 }

void ATheCharacter::MoveForward(float value)
{
    AddMovementInput(GetActorForwardVector(), value);
}

别忘了头文件声明方法：void MoveForward(float value);

pitch是围绕X轴旋转，也叫做俯仰角

yaw是围绕Y轴旋转，也叫偏航角

roll是围绕Z轴旋转，也叫翻滚角