My app should scan Wifi signals around and list the network's name and its RSSI.
I can't find any clue on Google about how to do it. Could someone give an example or at least point somewhere else where I can find the answer?
I dont think its possible ! It doesnt matter if its Swift or Objective-C nor C++, the basic principle of iOS is that only system can connect to WiFi or turn on off those system setting. All you can get is info about the currently connected network. App sandbox in ios limits all other possibility.
It is only possible to get the SSID of the network that you are currently connected to.