WoW API: CreateFrame

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Creates a new UI frame.

newFrame = CreateFrame("frameType", "frameName", parentFrame[, "inheritsFrame"]);

Parameters

Arguments

frameType: String - Type of the frame to be created (XML tag name): "Frame", "Button"... etc.
frameName: String - Name of the newly created frame. If nil, no frame name is assigned.
parentFrame: Frame - The frame object that will be used as the created Frame's parent (cannot be a string!)
inheritsFrame: String - Name of a (virtual) frame to inherit (the same as in XML)

Returns

newFrame: Frame - Pointer to the newly created frame.

Example

Result: displays the horde and alliance insignias in the middle of the screen.

local f = CreateFrame("Frame",nil,UIParent)
f:SetFrameStrata("BACKGROUND")
f:SetWidth(128)  -- Set These to whatever height/width is needed 
f:SetHeight(64) -- for your Texture

local t = f:CreateTexture(nil,"BACKGROUND")
t:SetTexture("Interface\\Glues\\CharacterCreate\\UI-CharacterCreate-Factions.blp")
t:SetAllPoints(f)
f.texture = t

f:SetPoint("CENTER",0,0)
f:Show()

Notes

CreateFrame() was added in 1.10
The fourth argument, inheritFrame, was added in 1.11
In creating frames with CreateFrame(), you cannot use the OnLoad script handler (e.g. Frame:SetScript("OnLoad", function)) since CreateFrame() loads the frame before Frame:SetScript() is called. If you want to use the OnLoad script handler, define the frame in an XML file that is called before the LUA file or call the OnLoad function manually at the end of the LUA file.