ios - iPhone Wifi on or off?

Question

Within iOS framework, how can one check if the Wifi radio is enabled by the user or not? Please note that I'm not interested in the reachability through Wifi but rather if the device is turned off by the user. Thanks.

Answer 1

Based on: http://www.enigmaticape.com/blog/determine-wifi-enabled-ios-one-weird-trick

Wifi status can be determined to be ON/ OFF using C based ifaddress struct from:

ifaddrs.h, and

net/if.h

[Code source: unknown.]

- (BOOL) isWiFiEnabled {

    NSCountedSet * cset = [NSCountedSet new];

    struct ifaddrs *interfaces;

    if( ! getifaddrs(&interfaces) ) {
        for( struct ifaddrs *interface = interfaces; interface; interface = interface->ifa_next) {
            if ( (interface->ifa_flags & IFF_UP) == IFF_UP ) {
                [cset addObject:[NSString stringWithUTF8String:interface->ifa_name]];
            }
        }
    }

    return [cset countForObject:@"awdl0"] > 1 ? YES : NO;
}

Swift 3 version (requires bridging header with #include <ifaddrs.h>):

func isWifiEnabled() -> Bool {
    var addresses = [String]()

    var ifaddr : UnsafeMutablePointer<ifaddrs>?
    guard getifaddrs(&ifaddr) == 0 else { return false }
    guard let firstAddr = ifaddr else { return false }

    for ptr in sequence(first: firstAddr, next: { $0.pointee.ifa_next }) {
        addresses.append(String(cString: ptr.pointee.ifa_name))
    }

    freeifaddrs(ifaddr)
    return addresses.contains("awdl0")
}