Since iOS 10.3 has been released, Apple added a new feature which allows us to change the app icon dynamically, by using setAlternateIconName(_:completionHandler:) method. So far, as mentioned in the method documentation, we have to mention the name(s) of the alternate app icon(s) in the project .plist file, assigned to CFBundlePrimaryIcon key.
Actually, when working with static icons (icons that have been added directly to the app main bundle) it works as expected without any problems:
My question is:
Is it possible -or is there a workaround- to set the alternate app icon dynamically (for instance: icons that have been downloaded from the web and saved in the app documents directory)?
I don't think its possible.
setAlternateIconName(_:completionHandler:) API looks for the icons inside app bundle and cannot be changed to fetch from sandbox.
Also, most probably Apple reviews the app icons you have bundled for avoiding use of same app icons or icons similar to Apple apps.
Refer: https://www.hackingwithswift.com/example-code/uikit/how-to-change-your-app-icon-dynamically-with-setalternateiconname