I had tested one of my apps on iOS 11 simulator by building it from xCode 9 GM and I am facing an issue with the status bar where it is not transparent any more and is pushing the app 20px down.
Both Cordova and Ionic are working on analysing and fixing these issues.
I am not aware of a suggested solution yet.
What device are you looking at here?
iPhone 7 device and iPhone 8 simulator
Hm, that this is present in iPhone 7 is strange.
You can joins the Ionic and Cordova Slacks and read/search the history, there were multiple attacks to fix this.
Here is one Cordova issue about the problem:
i solve it through building the project using xCode 8.3