Normally iOS developers cannot write some code to show Wi-Fi hotspots around an iPhone / iPad. The iDevice user has to select Setting -> Wi-Fi to access a list of nearby Wi-Fi networks.
Although there are a lot of programming restrictions with Wi-Fi functions, it is still possible to show a list of surrounding Wi-Fi APs by modifying the Info.plist file.
1. Create a new project and edit the Info.plist property list file as below:
Key: Application uses Wi-Fi
Another way of modification is to open Info.plist as source code and add the UIRequiresPersistentWiFi key as true:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
2. Select Setting -> Wi-Fi. Turn on both Wi-Fi and Ask to Join Networks.
3. Run the app. The Select a Wireless Network window is automatically popped up.