I have a drawing app in which I want to implement UNDO feature so

Question

Asked: May 30, 20262026-05-30T23:06:55+00:00 2026-05-30T23:06:55+00:00

I have a drawing app in which I want to implement UNDO feature so that user can undo the last drawing stroke that has been done.

Can you please let me know how can this be done?

Thanks

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Editorial Team · Answer 1 · 2026-05-30T23:06:57+00:00

First of all please specify what do you use to draw. Do you use any API or Core-Graphics Framework for drawing.

Here are some of the approaches from the link I found.

Approach:

on touchesEnded, save the image to app sandbox with a name like.. 1.png, 2.png etc. then put a count on “undo” variable. when user press undo, just loads the old image base on the count. (this is what I can think of roughly, but haven’t gone through the coding of it yet, but sounds pretty simple to code).
NSUndoManager.

Hope this helps for anyone else looking to do this.

Reference Link:

Cheers

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