How to use lambda in UE4

 

First, U need to declare an event like this in the header(.h):

 

DECLARE_EVENT(AAlienPlayerCharacter, TouchEvent)
TouchEvent LeftTouchGripEvent;
TouchEvent LeftTouchTiggerEvent;
TouchEvent RightTouchGripEvent;
TouchEvent RightTouchTriggerEvent;

 

Second, add content of this lambda like this in the BeginPlay() of the cpp file:

 

	LeftTouchGripEvent.AddLambda([this] 
	{
		UE_LOG(LogTemp, Warning, TEXT("LeftTouchGripEvent"));
	});
	RightTouchGripEvent.AddLambda([this] 
	{
		UE_LOG(LogTemp, Warning, TEXT("RightTouchGripEvent"));
	});
	LeftTouchTiggerEvent.AddLambda([this] 
	{
		UE_LOG(LogTemp, Warning, TEXT("LeftTouchTiggerEvent"));
	});
	RightTouchTriggerEvent.AddLambda([this] 
	{
		UE_LOG(LogTemp, Warning, TEXT("RightTouchTriggerEvent"));
	});

 

Last, in your trigger function, broadcast it like this:

 

LeftTouchGripEvent.Broadcast();

LeftTouchTiggerEvent.Broadcast();

RightTouchGripEvent.Broadcast();

RightTouchTriggerEvent.Broadcast();

 

深入未完待续....