From <2017-04-21 Fri> it is possible to get the current wifi information from the Captive Network. In the past, apple actually disabled this api for a while, but they seems to re-enabled it due to strong request. It is also possible that they decide to close this api in the future.

Captive Network

The information we can get is BSSID, SSID, SSIDDATA. BSSID is the unique address for wifi, SSID is the current wifi name, SSIDDATA is the hex representation for the SSID.

Swift

Updated at <2017-04-21 Fri> for Swift 3.1, XCode 8.3

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func printCurrentWifiInfo() {
  if let interface = CNCopySupportedInterfaces() {
    for i in 0..<CFArrayGetCount(interface) {
      let interfaceName: UnsafeRawPointer = CFArrayGetValueAtIndex(interface, i)
      let rec = unsafeBitCast(interfaceName, to: AnyObject.self)
      if let unsafeInterfaceData = CNCopyCurrentNetworkInfo("\(rec)" as CFString), let interfaceData = unsafeInterfaceData as? [String : AnyObject] {
        // connected wifi
        print("BSSID: \(interfaceData["BSSID"]), SSID: \(interfaceData["SSID"]), SSIDDATA: \(interfaceData["SSIDDATA"])")
      } else {
        // not connected wifi
      }
    }
  }
}

Objective-C

Updated at <2017-04-21 Fri> for clang-802.0.38, XCode 8.3

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NSArray *interFaceNames = (__bridge_transfer id)CNCopySupportedInterfaces();

for (NSString *name in interFaceNames) {
  NSDictionary *info = (__bridge_transfer id)CNCopyCurrentNetworkInfo((__bridge CFStringRef)name);

  NSLog[@"wifi info: bssid: %@, ssid:%@, ssidData: %@", info[@"BSSID"], info[@"SSID"], info[@"SSIDDATA"]];
 }