Hi,
All you need to add your app to iOS settings is to create a special bundle from Xcode.
Open Xcode app.
File->New->New File
Select iOS tab and find section "Resources".
Select "Settings Bundle" template.
Add settings to your bundle and save it to your Qt project folder.
In your project pro file a next line:
app_launch_images.files = $$files($$PWD/Settings.bundle)
QMAKE_BUNDLE_DATA += app_launch_images
In iOS you can use this settings bundle with NSUserDefaults class.
For this I'm using objective-c code. So on this step you will need to create a bridge class which will use objective-c code.