How to save Image in UserDefaults?

Question

Swift

I get an image from the network by url, then I display it as a UIImage.
I wanted to make sure that when the Internet was turned off, the previously downloaded pictures were saved and questions arose.

1) Do I need to convert the image to jpeg? For some reason, in the guides I saw only this way.
2) Where should we populate and retrieve data to/from UserDefaults? (I'm using tableView) In a function that configures a UIImage to display in a cell? or a tableView delegate method like didSelectRowAt?

ps Maybe these are stupid questions, but this is the first time I've encountered UserDefaults.

Answer 1

The image definitely does not need to be saved to UserDefaults
AND the image does not need to be saved to the database
Only to a file