UE4提供了非常方便的Tick函数，但是在一些情况下一些Tick函数不会默认存在，则需要自己添加。
Overview
这篇文章学习理解如何在UObject中添加Tick函数。
FTickableGameObject
MyTickableThing.h1
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34#pragma once
#include "CoreMinimal.h"
#include "Tickable.h"
class FMyTickableThing : public FTickableGameObject
{
public:
// FTickableGameObject Begin
virtual void Tick( float DeltaTime ) override;
virtual ETickableTickType GetTickableTickType() const override
{
return ETickableTickType::Always;
}
virtual TStatId GetStatId() const override
{
RETURN_QUICK_DECLARE_CYCLE_STAT( FMyTickableThing, STATGROUP_Tickables );
}
virtual bool IsTickableWhenPaused() const
{
return true;
}
virtual bool IsTickableInEditor() const
{
return false;
}
// FTickableGameObject End
private:
// The last frame number we were ticked.
// We don't want to tick multiple times per frame
uint32 LastFrameNumberWeTicked = INDEX_NONE;
};
MyTickableThing.cpp1
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12#include "MyTickableThing.h"
void FMyTickableThing::Tick( float DeltaTime )
{
if ( LastFrameNumberWeTicked == GFrameCounter )
return;
// Do our tick
// ...
LastFrameNumberWeTicked = GFrameCounter;
}
当然这种写法并不是只局限于UObject，自己定义的结构体或者类都可以使用这个方式。