Roblox Studio - Health Bar UI Script

-- { Variables } --

local plrs = game:GetService("Players")
local plr = plrs.LocalPlayer
local char = plr.Character or plr.CharacterAdded:Wait()
local humanoid = char:WaitForChild("Humanoid")

local UI = script.Parent
local barBackground = UI:WaitForChild("BarBackground")

local bar = barBackground:WaitForChild("Bar")
local percentage = barBackground.Percentage

-- { Functions } --

function healthChanged()
    bar:TweenSize(
        UDim2.fromScale((humanoid.Health / humanoid.MaxHealth), 1),
        Enum.EasingDirection.In,
        Enum.EasingStyle.Quart,
        .1,
        true,
        nil
    )

    percentage.Text = tostring(humanoid.Health).."/"..tostring(humanoid.MaxHealth)
end

healthChanged()
humanoid.HealthChanged:Connect(healthChanged)