the Shortcuts app will save the original app icon to the Photos app. You will instantly see the new dark mode photo. Press and hold the image, then choose the Save to Photos option from the menu.

But if you don't have it yet, either download one from the internet – there are a bunch of free icon sources online – or put your creative skills to use with your favorite image editing app.

create an icon from any saved image on your Mac, and use Apple Intelligence to generate an app icon. All three options open a pop-up window, and once you've selected or generated an icon ...

You cannot pick your own app icon images, unless the developer includes custom icon choices already in the application. To get dark mode icons, if iOS has not done it already, you’ll need to ...