Automatic App Icon Style Change in iOS 26

After updating from iOS 18 to iOS 26, our app icon appears to have automatically received the new 'Liquid Glass' effect. We confirmed that this change occurred without us releasing a new app update.

My questions are:

Is this a system behavior where iOS 26 automatically applies the new icon style to existing apps?

If so, is it possible for a developer to control or customize this effect? I am also wondering if there are any methods other than using Icon Composer.

Yes, this is a system behavior. It tries to add a glass effect to existing icons even though it does not work with every icon.

You cannot customize this. When you compile with Xcode 26 you will lose this effect on your existing icon too as Apple assumes you do not want the glass effect. For all other cases, use Icon Composer.

Automatic App Icon Style Change in iOS 26
 
 
Q