My question is about private API in IOS. Is there some API to manage WiFi connection? For example I'm using Apple80211.framework to scan WiFi networks but it's unusable for connecting.
My app isn't for appstore.
I ran into this issue last year and after quite a bit of digging I came across a helpful example called SOLStumbler. For this app to work your device must be jailbroken. I modified SOLStumbler and threw up a sample app on github. It uses the IPConfiguration bundle to access Apple80211 framework, which allows you to associate to a network. The readme contains the custom build instructions.