Reachability Guide for iOS

Reachability Guide for iOS

I have implemented Reachability like this.
Download https://developer.apple.com/library/content/samplecode/Reachability/Introduction/Intro.html and add Reachability.h and .m to your project. Add the SystemConfiguration framework to your project. #import "Reachability.h" where you want to use it. Use this code.

-(BOOL)reachable {
    Reachability *r = [Reachability reachabilityWithHostName:@"enbr.co.cc"];
    NetworkStatus internetStatus = [r currentReachabilityStatus];
    if(internetStatus == NotReachable) {
        return NO;
    }
    return YES;
}

When you want to check for reachability...

if ([self reachable]) {
    NSLog(@"Reachable");
}
else {
    NSLog(@"Not Reachable");
}

Here is the example project that I made. http://dl.dropbox.com/u/3656129/ReachabilityExample.zip

iOS Reachability SCNetworkReachabilitySetCallback not call back when switch form wifi to anthor wifi

Thank you for asking great qestion.

Mainly Reachability class is use for tracking of internet connectivity changes. There is no provsion for detect wifi changed notification. So in one word Reachability class not provide this type of funtionality. If you want to achieved your requirement then below customisation required.

You can achived wifi changed notification as below.

• When your wifi connection changed or switch to any other network then you have received disconnect state for fraction of second. So reachabilityChanged method is called.

• By using below code, You can get wifi information such as BSSID,SSID(Name) and SSID data. Just store wifi info into local.

• When network changed then you can check new wifi information is matched with previos one or not. If not then user connect with new wifi.

Put below code into reachabilityChanged method.

import SystemConfiguration.CaptiveNetwork

 func printCurrentWifiInfo() {
            if let interface = CNCopySupportedInterfaces() {
                for i in 0..                    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: \(String(describing: interfaceData["BSSID"])), SSID: \(String(describing: interfaceData["SSID"])), SSIDDATA: \(String(describing: interfaceData["SSIDDATA"]))")
                    } else {
                        //Wifi is not connected
                    }
                }
            }
        }

Update:

Apple provide com.apple.system.config.network_change to listen wifi changes notification. Basically it is part of Core Foundation framework. I am sure it will work for you.

Please add below code to listen wifi changes.

 let notificationName = "com.apple.system.config.network_change"


    func onNetworkChange(_ name : String) {
        if (name == notificationName) {
            // Do your stuff
            print("Network was changed")
        }
    }

    func registerObserver() {
        let observer = UnsafeRawPointer(Unmanaged.passUnretained(self).toOpaque())
        CFNotificationCenterAddObserver(CFNotificationCenterGetDarwinNotifyCenter(), observer,
                                        { (nc, observer, name, _, _) -> Swift.Void in
                                            if let observer = observer, let name = name {
                                                let instance = Unmanaged.fromOpaque(observer).takeUnretainedValue()
                                                instance.onNetworkChange(name.rawValue as String)
                                            } },
                                        notificationName as CFString, nil, .deliverImmediately)
    }


    func removeObserver() {
        let observer = UnsafeRawPointer(Unmanaged.passUnretained(self).toOpaque())
        CFNotificationCenterRemoveObserver(CFNotificationCenterGetDarwinNotifyCenter(), observer, nil, nil)
    }

Register observer on init and remove on deinit.
Find reference from Here.

Need some help with Reachability (2.0.3ddg)

OK, so after trying a few things out myself, I actually got it to work, by adding one extra line of code:

-(void)setupReachability {
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reachabilityChanged:) name:kReachabilityChangedNotificationV2 object:nil];
    hostReach = [[ReachabilityV2 reachabilityWithHostName:@"www.google.com"] retain];
    [hostReach connectionRequired]; // this line was added, and apparently forces a connection requirement..
    [hostReach startNotifier];
}

iOS 5.1 Reachability

https://github.com/tonymillion/Reachability

iOS5 / GCD / ARC friendly version

Is Apple's current Reachability class backwards-compatible with iOS 3.1?

Never found an answer, but I implemented Andrew Donoho's version of the class and it worked fine on iOS 3.1.2.

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