How to make text fade in and out?

Solution

This solution has not been tested

You had some problems with your script. For example, you tried to get the gui from StarterGui. You should never do this, instead you must get the player from using :GetPlayerFromCharacter(). You would also want to use for i = 0, 1, 0.5 do or for i = 1, 0, -0.5 for doing a loop. It will make it smoother and it is better for fades instead of doing for i = 1, 10 do and so on.

One of the best ways of doing this is code below. If you don't understand any of it then please just let me know.

It is suggested that you copy this piece of code to your clipboard and paste it into studio so you can view it better.

script.Parent.Touched:connect(function(hit)
    local hitplayer = game.Players:GetPlayerFromCharacter(hit.Parent); -- we must somehow get the player
        if (hitplayer) then -- if what hit it was a player then
            local screengui = hitplayer.PlayerGui:FindFirstChild("ScreenGui"); -- defining the 'ScreenGui'
                if (screengui) then -- if there a is 'ScreenGui' then
                    screengui.Frame.Visible = true; -- making the frame visible
                        for i = 1, 0, -.05 do wait() -- Going from 1 to 0 at -0.05 per a wait()
                            screengui.Frame.TextLabel.TextTransparency = i; -- the tranparency is the current 'i'
                        end;
                        screengui.Frame.TextLabel.TextTransparency = 0; -- making sure it ends at 0
                        wait(5);
                        for i = 0, 1, .05 do wait() -- Going from 0 to 1 at .05 per a wait()
                            screengui.Frame.TextLabel.TextTransparency = i; -- the tranparency is the current 'i'
                        end;
            screengui.Frame.TextLabel.TextTransparency = 1; -- making sure it ends at 1
                    screengui.Frame.Visible = false; -- making the frame invisible
                    end;
            end;
    end);

I hope you get what I'm trying to say, I haven't tested the script so I have no idea if it works. It should, but it just might not.

If this helped you then put it as the answer, if it didn't help then tell me why with a comment

StarterGui is simply an object to clone Guis into every player's PlayerGui.

If you want a player's text to change:

local part = script.Parent

function fadeIn(text) -- makes text visible
    while text.TextTransparency > 0 do
        text.BackgroundTransparency = text.BackgroundTransparency - 0.1
        text.TextTransparency = text.TextTransparency - 0.1
        text.TextStrokeTransparency = text.TextStrokeTransparency - 0.1
        wait(0.1)
    end
end

function fadeOut(text) -- makes text iinvisible
    while text.TextTransparency < 1 do
        text.BackgroundTransparency = text.BackgroundTransparency + 0.1
        text.TextTransparency = text.TextTransparency + 0.1
        text.TextStrokeTransparency = text.TextStrokeTransparency + 0.1
        wait(0.1)
    end
end

local enabled = false

part.Touched:connect(function(hit)
    local p = game.Players:GetPlayerFromCharacter(hit.Parent) -- gets the player
    if p then -- checks to see if object that touched part is actually a player
        local gui = p.PlayerGui:FindFirstChild("GuiName")
        if gui then
            if enabled == false then -- makes sure fade isn't running
                enabled = true
                fadeIn(gui.Frame.Text)
                wait(5) -- text is visible for 5 seconds
                fadeOut(gui.Frame.Text)
                enabled = false
            end
        end
    end
end)

Thx for the help! It worked! :)

script.Parent.Touched:connect(function(hit)
    local hitplayer = game.Players:GetPlayerFromCharacter(hit.Parent); -- we must somehow get the player
        if (hitplayer) then -- if what hit it was a player then
            local screengui = hitplayer.PlayerGui:FindFirstChild("ScreenGui"); -- defining the 'ScreenGui'
                if (screengui) then -- if there a is 'ScreenGui' then
                    screengui.Frame.Visible = true; -- making the frame visible
                        for i = 1, 0, -.05 do wait() -- Going from 1 to 0 at -0.05 per a wait()
                            screengui.Frame.TextLabel.TextTransparency = i; -- the tranparency is the current 'i'
                        end;
                        screengui.Frame.TextLabel.TextTransparency = 0; -- making sure it ends at 0
                        wait(5);
                        for i = 0, 1, .05 do wait() -- Going from 0 to 1 at .05 per a wait()
                            screengui.Frame.TextLabel.TextTransparency = i; -- the tranparency is the current 'i'
                        end;
            screengui.Frame.TextLabel.TextTransparency = 1; -- making sure it ends at 1
                    screengui.Frame.Visible = false; -- making the frame invisible
                    end;
            end;
    end);