求助：使用Tween移动Part后，其位置无法通过脚本或工具修改

我尝试用Tween平滑移动Part，脚本会创建Part并在1秒内移到目标位置，但移动完成后，不管是用移动工具还是脚本都没法修改这个Part的位置。

原问题脚本 #

local tweenService = game:GetService("TweenService")
local runService = game:GetService("RunService")
local player = game.Players.LocalPlayer

local RunServiceEvent = nil
local tweenInfo = TweenInfo.new(1, Enum.EasingStyle.Sine, Enum.EasingDirection.InOut)

function SpawnPart()
    local part = Instance.new("Part")
    part.Anchored = true
    part.Parent = game.Workspace.Clutter.Coins

    local startPos = Vector3.new(0, 2, 0)
    part.Position = startPos

    local TargetPosition = Vector3.new(5, 2, 0)

    local Tween = tweenService:Create(part, tweenInfo, {Position = TargetPosition})
    Tween:Play()

    local StartTime = tick()
    RunServiceEvent = runService.RenderStepped:Connect(function()
        local Time = (tick() - StartTime) / tweenInfo.Time

        if part == nil then return end

        if Time > 1 then
            part.Position = TargetPosition
            return
        end
    end)

    task.spawn(function()
        Tween.Completed:Wait()
        task.wait()
        RunServiceEvent = nil
    end)
end

player:WaitForChild("PlayerGui"):WaitForChild("ScreenGui"):WaitForChild("TextButton").Activated:Connect(SpawnPart)

问题原因 #

1. RenderStepped连接未正确断开：代码仅将RunServiceEvent设为nil，未调用Disconnect()方法，导致回调函数持续每帧执行。
2. 强制锁死位置：当Time > 1时，回调函数会不断把Part位置重置为目标位置，任何手动修改都会被立刻覆盖。
3. 冗余逻辑：TweenService本身会自动完成位置过渡，不需要额外通过RenderStepped监听并设置位置。

修复方案 #

方案一：移除冗余的RenderStepped监听（推荐） #

直接让TweenService独立完成移动逻辑，代码更简洁：

local tweenService = game:GetService("TweenService")
local player = game.Players.LocalPlayer

local tweenInfo = TweenInfo.new(1, Enum.EasingStyle.Sine, Enum.EasingDirection.InOut)

function SpawnPart()
    local part = Instance.new("Part")
    part.Anchored = true
    part.Parent = game.Workspace.Clutter.Coins

    local startPos = Vector3.new(0, 2, 0)
    part.Position = startPos

    local TargetPosition = Vector3.new(5, 2, 0)

    local Tween = tweenService:Create(part, tweenInfo, {Position = TargetPosition})
    Tween:Play()

    -- 如需在Tween完成后执行其他逻辑，保留此任务即可
    task.spawn(function()
        Tween.Completed:Wait()
        -- 这里添加Tween完成后的自定义逻辑
    end)
end

player:WaitForChild("PlayerGui"):WaitForChild("ScreenGui"):WaitForChild("TextButton").Activated:Connect(SpawnPart)

方案二：保留RenderStepped但正确断开连接 #

如果确实需要保留RenderStepped做额外帧同步逻辑，必须在合适时机断开连接：

local tweenService = game:GetService("TweenService")
local runService = game:GetService("RunService")
local player = game.Players.LocalPlayer

local RunServiceEvent = nil
local tweenInfo = TweenInfo.new(1, Enum.EasingStyle.Sine, Enum.EasingDirection.InOut)

function SpawnPart()
    local part = Instance.new("Part")
    part.Anchored = true
    part.Parent = game.Workspace.Clutter.Coins

    local startPos = Vector3.new(0, 2, 0)
    part.Position = startPos

    local TargetPosition = Vector3.new(5, 2, 0)

    local Tween = tweenService:Create(part, tweenInfo, {Position = TargetPosition})
    Tween:Play()

    local StartTime = tick()
    RunServiceEvent = runService.RenderStepped:Connect(function()
        local Time = (tick() - StartTime) / tweenInfo.Time

        if not part then
            RunServiceEvent:Disconnect()
            return
        end

        if Time > 1 then
            RunServiceEvent:Disconnect()
            return
        end
    end)

    task.spawn(function()
        Tween.Completed:Wait()
        if RunServiceEvent then
            RunServiceEvent:Disconnect()
            RunServiceEvent = nil
        end
    end)
end

player:WaitForChild("PlayerGui"):WaitForChild("ScreenGui"):WaitForChild("TextButton").Activated:Connect(SpawnPart)

内容的提问来源于stack exchange，提问作者Lukas Raby