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Fix CNCopyCurrentNetworkInfo() does NOT work on iOS13

License: MIT License

Swift 100.00%

wwdc19 ios13

ios13-wifi-info's Introduction

iOS13-WiFi-Info

Fix CNCopyCurrentNetworkInfo() does NOT work in iOS13 and later

Get Wi-Fi SSID in iOS 12 and earlier

stackoverflow

import Foundation
import SystemConfiguration.CaptiveNetwork

func getSSID() -> String? {
    var ssid: String?
    if let interfaces = CNCopySupportedInterfaces() as NSArray? {
        for interface in interfaces {
            if let interfaceInfo = CNCopyCurrentNetworkInfo(interface as! CFString) as NSDictionary? {
                ssid = interfaceInfo[kCNNetworkInfoKeySSID as String] as? String
                break
            }
        }
    }
    return ssid
}

To use CNCopyCurrentNetworkInfo() in iOS 12 and later, enable the Access WiFi Information capability in Xcode. For more information, see Access WiFi Information Entitlement.

CNCopyCurrentNetworkInfo() returns nil in iOS 13 and later

Watch WWDC19 Session 713: Advances in Networking, Part 2.

Now you all know the important privacy to Apple. And one of the things we realized. Is that... Accessing Wi-Fi information can be used to infer location.

So starting now, to access that Wi-Fi information. You'll need the same kind of privileges that you'll need to get other location information.

Requires Capability: Access Wi-Fi Information

Must also meet at least one of criteria below

Apps with permission to access location
Currently enabled VPN app
NEHotspotConfiguration (only Wi-Fi networks that the app configured)

Otherwise, returns nil

Get Wi-Fi SSID in iOS 13 and later

Import Core Location framework

import CoreLocation

Function to update UI

func updateWiFi() {
    print("SSID: \(currentNetworkInfos?.first?.ssid)")
    ssidLabel.text = getSSID()
}

Ask location permission

if #available(iOS 13.0, *) {
    let status = CLLocationManager.authorizationStatus()
    if status == .authorizedWhenInUse {
        updateWiFi()
    } else {
        locationManager.delegate = self
        locationManager.requestWhenInUseAuthorization()
    }
} else {
    updateWiFi()
}

Implement CLLocationManagerDelegate

class ViewController: UIViewController, CLLocationManagerDelegate {
    ...
    func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
        if status == .authorizedWhenInUse {
            updateWiFi()
        }
    }
    ...
}

Update your app

If your app uses CNCopyCurrentNetworkInfo() and needs to solve the issue. Solve it now. There's no need to wait for Xcode 11 GM. The solution above is Xcode 10 compatible.

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ios13-wifi-info's Issues

Can you help me to add Object-c code?

HI, I just encounter this issue too. But I don't know how to fix it in object-c format. Can you help me about this? thank you very much.

Error getting SSID iOS 13.1 on Release Build

getting this below error in Release Build on Debug its working fine.
Check-WiFI[742:190311] [] nehelper sent invalid result code [1] for Wi-Fi information request

iOS 13 adaptation

Need to adapt the App on the AppStore？ or Apple will do it yourself?

Return value for CLLocationManager.authorizationStatus()

I need to detect network changes in background.
But there was a problem when requesting location permission.

CLLocationManager.authorizationStatus() returns .authorisedAlways when the device is set to “While Using the App”

Maybe because I don't know iOS and Swift well. What's wrong?

override func viewDidLoad() {
    super.viewDidLoad()

    if #available(iOS 13.0, *) {
        let status = CLLocationManager.authorizationStatus()
            
        if status == .authorizedAlways {
            print("Always")
            startWifiDetection()
        } else if status == .authorizedWhenInUse {
            print("While Using the App")
            locationManager.delegate = self
            locationManager.requestAlwaysAuthorization()
        } else {
            print("Never or Ask Next Time")
            locationManager.delegate = self
            locationManager.requestWhenInUseAuthorization()
        }
    }
}

Got reject when using CoreLocation to get wifi ssid on ios13

I got reject from apple when using CoreLocation to get wifi SSID, because of my app only use this to detecting current wifi and this is not enough to pass apple review

Guideline 2.5.4 - Performance - Software Requirements

Your app declares support for location in the UIBackgroundModes key in your Info.plist file but does not have any features that require persistent location. Apps that declare support for location in the UIBackgroundModes key in your Info.plist file must have features that require persistent location.

Anybody know another way to get current wifi SSID? thank.