当属性被注册进行复制后，您将无法再取消注册（涉及到生存期这一话题）。之所以会这样，是因为我们要预制尽可能多的信息，以便针对同一组属性将某一工作分担给多个连接。这样可以节省大量的计算时间。

	virtual void GetLifetimeReplicatedProps(TArray<FLifetimeProperty>& OutLifetimeProps) const override;

void ARPCProjectCharacter::GetLifetimeReplicatedProps(TArray <FLifetimeProperty> & OutLifetimeProps) const
{Super::GetLifetimeReplicatedProps(OutLifetimeProps);DOREPLIFETIME_CONDITION(ARPCProjectCharacter, OverlappingWeapon, COND_OwnerOnly);DOREPLIFETIME(ARPCProjectCharacter, Health);DOREPLIFETIME_ACTIVE_OVERRIDE( ARPCProjectCharacter, ReplicatedMovement, bReplicateMovement );
}

/** Secondary condition to check before considering the replication of a lifetime property. */
UENUM(BlueprintType)
enum ELifetimeCondition
{COND_None = 0							UMETA(DisplayName = "None"),							// This property has no condition, and will send anytime it changesCOND_InitialOnly = 1					UMETA(DisplayName = "Initial Only"),					// This property will only attempt to send on the initial bunchCOND_OwnerOnly = 2						UMETA(DisplayName = "Owner Only"),						// This property will only send to the actor's ownerCOND_SkipOwner = 3						UMETA(DisplayName = "Skip Owner"),						// This property send to every connection EXCEPT the ownerCOND_SimulatedOnly = 4					UMETA(DisplayName = "Simulated Only"),					// This property will only send to simulated actorsCOND_AutonomousOnly = 5					UMETA(DisplayName = "Autonomous Only"),					// This property will only send to autonomous actorsCOND_SimulatedOrPhysics = 6				UMETA(DisplayName = "Simulated Or Physics"),			// This property will send to simulated OR bRepPhysics actorsCOND_InitialOrOwner = 7					UMETA(DisplayName = "Initial Or Owner"),				// This property will send on the initial packet, or to the actors ownerCOND_Custom = 8							UMETA(DisplayName = "Custom"),							// This property has no particular condition, but wants the ability to toggle on/off via SetCustomIsActiveOverrideCOND_ReplayOrOwner = 9					UMETA(DisplayName = "Replay Or Owner"),					// This property will only send to the replay connection, or to the actors ownerCOND_ReplayOnly = 10					UMETA(DisplayName = "Replay Only"),						// This property will only send to the replay connectionCOND_SimulatedOnlyNoReplay = 11			UMETA(DisplayName = "Simulated Only No Replay"),		// This property will send to actors only, but not to replay connectionsCOND_SimulatedOrPhysicsNoReplay = 12	UMETA(DisplayName = "Simulated Or Physics No Replay"),	// This property will send to simulated Or bRepPhysics actors, but not to replay connectionsCOND_SkipReplay = 13					UMETA(DisplayName = "Skip Replay"),						// This property will not send to the replay connectionCOND_Never = 15							UMETA(Hidden),											// This property will never be replicatedCOND_Max = 16							UMETA(Hidden)
};

COND_InitialOnly ：此属性将仅尝试在初始话的时候发送
COND_OwnerOnly：此属性仅发送至 actor 的所有者
COND_SkipOwner：该属性将发送至除所有者之外的每个连接
COND_SimulatedOnly：该属性仅发送至模拟 actor
COND_AutonomousOnly：该属性仅发送给自治 actor
COND_SimulatedOrPhysics :该属性将发送至模拟或 bRepPhysics actor
COND_InitialOrOwner :该属性将发送初始数据包，或者发送至 actor 所有者
COND_Custom :该属性没有特定条件，但需要通过 SetCustomIsActiveOverride 得到开启/关闭能力
COND_ReplayOrOwner :此属性将仅发送到重播连接，或 actor所有者
COND_ReplayOnly :此属性将只发送到重播连接
COND_SimulatedOnlyNoReplay :此属性将仅发送给参与者，而不发送给重播连接
COND_SimulatedOrPhysicsNoReplay:此属性将发送给模拟的Or bRepPhysics参与者，但不发送给重播连接
COND_Never :此属性不会发送到重播连接

DOREPLIFETIME_ACTIVE_OVERRIDE 的宏可以让您进行全面控制，利用您想要的任何定制条件来决定何时复制/不复制某个属性。需要注意的是，这种控制需针对每个 actor（而不是每条连接）逐一进行。换句话说，如果在定制条件中使用一个可根据连接而发生变化的状态，会存在一定的安全风险。
现在 ReplicatedMovement 属性只会在 bReplicateMovement 为 true 时复制。

为何不一直使用这个宏？主要有两个原因：

1.如果定制条件的值变化太大，这种做法会降低执行速度。2.您不能使用根据连接而变化的条件（此时不检查 RemoteRole）

Replicated

void ARPCProjectCharacter::GetLifetimeReplicatedProps(TArray <FLifetimeProperty> & OutLifetimeProps) const
{Super::GetLifetimeReplicatedProps(OutLifetimeProps);//复制当前生命值。DOREPLIFETIME(ARPCProjectCharacter, HP);}

void ARPCProjectCharacter::StartFire()
{FunctionServer();
}

	UFUNCTION(Server, Reliable)void FunctionServer();

void ARPCProjectCharacter::FunctionServer_Implementation()
{HP-=10;}

void ARPCProjectCharacter::Tick(float DeltaSeconds)
{Super::Tick(DeltaSeconds);if (HasAuthority()){UE_LOG(LogTemp,Warning,TEXT("HPTick is: %f "),HP);}else{GEngine->AddOnScreenDebugMessage(-1, 1.f, FColor::Red, FString::Printf(TEXT("HPTickHello world, this is %f"), HP));}
}

ReplicatedUsing

	UFUNCTION(Server, Reliable)void FunctionServer();UPROPERTY(ReplicatedUsing=OnRep_WhatOn)float WhatOn=100;/** RepNotify，用于同步对当前生命值所做的更改。*/UFUNCTION()void OnRep_WhatOn();

void ARPCProjectCharacter::GetLifetimeReplicatedProps(TArray <FLifetimeProperty> & OutLifetimeProps) const
{Super::GetLifetimeReplicatedProps(OutLifetimeProps);//复制当前生命值。DOREPLIFETIME(ARPCProjectCharacter, WhatOn);}

void ARPCProjectCharacter::StartFire()
{FunctionServer();
}

void ARPCProjectCharacter::FunctionServer_Implementation()
{WhatOn-=10;
}

void ARPCProjectCharacter::OnRep_WhatOn()
{GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Red, FString::Printf(TEXT("Health, this is %f"), WhatOn));UE_LOG(LogTemp,Warning,TEXT("Health is: %f "),WhatOn);
}