I tried running a Qt example (animatedtiles). I then opened the xcodeproj in Xcode, and tried to submit the example to the App Store. On submission, it errors out saying:

ERROR ITMS-9000: "Missing required icon file. The bundle does not contain an app icon for iPhone / iPod Touch of exactly '57x57' pixels, in .png format for iOS versions < 7.0."

and other similar error for various icon sizes and versions. It'd be nice if Qt Creator handled these things automatically for each platform so that all we have to do is develop in Qt Creator, open in Xcode (or Android Studio, Visual Studio) and submit without these problems and without have to further modify the project.