I've been trying to obtain the signal strength using Swift 4 with iOS 12. Using the documentation seems like a lot of methods are Deprecated or no longer working. Any advice will be highly appreciated.
it looks like your issue could be solved by this: A way to calculate or get wifi strength on Swift on iOS 11
But that seems to be not working @iOS12 anymore.
Looking at https://forums.developer.apple.com/thread/67932 there seems to be no supported way to do this, but to use "illegal" private APIs.