Ideal image size for iOS

Question

If I want to display an icon with 24x24 in an app, what sizes should I provide in the app?

For example, is it sufficient to save the image as 128x128 in the app?

Or are @1x @2x @3x sizes required?

It is a simple icon (width == height), example:

Possible duplicate of [App icon size for new iOS](https://stackoverflow.com/questions/18819441/app-icon-size-for-new-ios) — Konrad Borowski, Jan 31 '18 at 15:17
@xfix The duplicate you've linked is about app icons and not assets in general. — Tamás Sengel, Jan 31 '18 at 15:18

score 1 · Accepted Answer · answered Jan 31 '18 at 15:16

Different sizes are not necessarily required, but they can help reducing binary sizes.

For an image that you want to show in the dimensions of 24x24, you should provide a 24x24, a 48x48 and a 72x72 image.

For simple graphics like this, it's usually more suitable if you create a vector asset.

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