不推荐使用 CaptiveNetwork 并且已阻止对 Wifi 名称的调用后，如何在 iOS9 中获取 Wifi SSID

Question

Until today I used the CaptiveNetwork Interface to display the name of the currently connected Wifi. The iOS 9 Prerelease reference already stated, that the CaptiveNetwork methods are depracted now, but they still worked at the beginning.

With the newest version Apple seems to have blocked this calls already (maybe due to privacy concerns?).

Is there any other way to get the name of the current Wifi?

This is how I obtained the SSID until today, but you only get nil now:

#import <SystemConfiguration/CaptiveNetwork.h>

NSString *wifiName = nil;  
NSArray *interFaceNames = (__bridge_transfer id)CNCopySupportedInterfaces(); 

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

    if (info[@"SSID"]) { 
        wifiName = info[@"SSID"]; 
    } 
} 

Answer 1

Register your app as Hotspot helper.

#import <NetworkExtension/NetworkExtension.h>  

NSArray * networkInterfaces = [NEHotspotHelper supportedNetworkInterfaces];  
NSLog(@"Networks %@",networkInterfaces);  

UPDATE (Sept. 11th, 2015)

The following Captive Network APIs have been re-enabled in the latest version of iOS 9 instead.

• CNCopySupportedInterfaces
• CNCopyCurrentNetworkInfo

UPDATE (Sept. 16th, 2015)

If you still prefer to use NetworkExtension and Apple gave you permission to add the entitlements, then you can do this to get the wifi information:

for(NEHotspotNetwork *hotspotNetwork in [NEHotspotHelper supportedNetworkInterfaces]) {
    NSString *ssid = hotspotNetwork.SSID;
    NSString *bssid = hotspotNetwork.BSSID;
    BOOL secure = hotspotNetwork.secure;
    BOOL autoJoined = hotspotNetwork.autoJoined;
    double signalStrength = hotspotNetwork.signalStrength;
}

NetworkExtension provides you some extra information as secure, auto joined or the signal strength. And it also allows you to set credential to wifis on background mode, when the user scans wifis around.

Answer 2

In the GM for iOS 9, it seems like this is enabled again. In fact, it's not even listed as deprecated in the online documentation, however the CaptiveNetwork header file does have the following:

CNCopySupportedInterfaces (void) __OSX_AVAILABLE_BUT_DEPRECATED_MSG(__MAC_10_8, __MAC_NA, __IPHONE_4_1, __IPHONE_9_0, CN_DEPRECATION_NOTICE);

So, it is working in the iOS 9 GM, but not sure for how long :)

Answer 3

The answer by abdullahselek is still correct even for Swift 4.1 and 4.2.

A small caveat is that now in iOS 12, you must go to the capabilities section of your app project and enable the Access WiFi Information feature. It will add an entitlement entry to your project and allow the function call CNCopyCurrentNetworkInfo to work properly.

If you do not do this, that function simply returns nil. No errors or warnings at runtime about the missing entitlement will be displayed.

For more info, see the link below to Apple's documentation.

https://developer.apple.com/documentation/systemconfiguration/1614126-cncopycurrentnetworkinfo

Answer 4

Confirm on 2017-April-27, Captive Network is still working for Swift 3.1 , XCode 8.3

For Swift > 3.0

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
      }
    }
  }
}

For Objective-C

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"]);
 }

Answer 5

As mentioned before CaptiveNetwork works well with Xcode 8.3 and upper. Here are code snippets for both Swift 3 , Swift 4 and Objective-C .

Swift 3 & 4

import SystemConfiguration.CaptiveNetwork

internal class SSID {

    class func fetchSSIDInfo() -> [String: Any] {
        var interface = [String: Any]()
        if let interfaces = CNCopySupportedInterfaces() {
            for i in 0..<CFArrayGetCount(interfaces){
                let interfaceName = CFArrayGetValueAtIndex(interfaces, i)
                let rec = unsafeBitCast(interfaceName, to: AnyObject.self)
                guard let unsafeInterfaceData = CNCopyCurrentNetworkInfo("\(rec)" as CFString) else {
                    return interface
                }
                guard let interfaceData = unsafeInterfaceData as? [String: Any] else {
                    return interface
                }
                interface = interfaceData
            }
        }
        return interface
    }

}

Objective-C

#import <SystemConfiguration/CaptiveNetwork.h>

+ (NSDictionary *)fetchSSIDInfo
{
    NSArray *interFaceNames = (__bridge_transfer id)CNCopySupportedInterfaces();
    for (NSString *name in interFaceNames)
    {
        NSDictionary *info = (__bridge_transfer id)CNCopyCurrentNetworkInfo((__bridge CFStringRef)name);
        return info;
    }
    return nil;
}

Answer 6

This should be working now with iOS 13.3. I'm using a related Pod library that uses the exact function in Objc and with a Swift wrapper.

https://github.com/Feghal/FGRoute

Answer 7

CaptiveNetwork is still working. Due to many requests Apple may have reinstated the API's.

Using CaptiveNetwork we can get the SSID of the WiFi network. It even works in iOS 10.

#import <SystemConfiguration/CaptiveNetwork.h>

NSDictionary *info = (__bridge_transfer id)CNCopyCurrentNetworkInfo((__bridge CFStringRef)name);

Here is the output:

Printing description of info:
{
    BSSID = "5*:**:**:**:**:**";
    SSID = Cisco12814;
    SSIDDATA = <43697363 6f313238 3134>;
}

Answer 8

CaptiveNetwork is still working. But you will need to add this:

com.apple.developer.networking.wifi-info = true inside your Entitlements.plist.

Plus, you need to be Enable the Access WiFi Information in the App ID part in your developer.apple.com portal.

Be sure, to clean your environment, generate new provisioning profile after enabling option "Access WiFi Information" in the App ID.