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Does BindAxis is the same to BindAction's IE_Axis KeyEvent?

I want to make the rebinding key by player self in our game.

but I do not want to use if else to know if use

BindAxis or BindAction

can I just use “BindAction’s IE_Axis KeyEven”

to instead of BindAxis

No. IE_Axis is a mostly deprecated concept that still exists just to support the DebugExecCommands feature that was how all UE3 bindings were done.

If you haven’t already looked at it, hopefully Input | Unreal Engine Documentation will give you some useful information on the differences between Actions and Axes.

thanks very much