I want to block my app's ui when there is no network connectivity.
I saw this post about checking network connectivity.
Is there a way to register for a listener with callback "onNetworkLost()", "onNetworkAvailable()"? Instead of creating my own periodic task?
You can use Reachability class to get notification when network status has changed. Refer https://developer.apple.com/library/ios/samplecode/Reachability/Introduction/Intro.html for documentation as well as sample code on integrating Reachability. It gives you kReachabilityChangedNotification notification which is broadcasted when network status has changed. Once you get the notification you can check whether network is available or not.
You can also refer this How to use reachability class to detect valid internet connection?
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When I checked the apple Reachability class, it does return true even though the connected network doesn't have an active internet connection. So I'm having few doubts here -
Why is Reachability class made to throw YES if the packet can leave the local device even though it doesn't ensure it is delivered at the endpoint? Are there any special reasons to limit the ability?
Reachability has reachabilityWithHostName method still, YES will be thrown by class even if we add familiar hostname in the same network. If it doesn't ensure endpoint packet delivery why they provided this method?
Is there any other way to check whether there is an active internet connection in the connected network other than Reachability? Do we need to add our custom APIs or logic to tackle this thing?
I did connect an android phone to the same network, it instantaneously notified me the connection has no internet connection.
I am using reachability from: https://github.com/tonymillion/Reachability in an objective-c app. I have it running, startNotifier is called and I see a reachabilityChanged: call when my app starts up. Now when I use the network link conditioner to simulate different network settings, I was under the assumption that reachabilityChanged: would be called.
Is that not the case or is there another step I need to do in order to simulate different network conditions? If I turn off the WiFi on my Mac, then I get reachabilityChanged: but not from doing it within network link simulator.
Reachability observes the state of the network connection, not the quality of it.
Since you are using network link conditioner you are only affecting the quality of the network like the speed or packet loss.
The only way reachability notifies you about a change is in fact when the network connection is lost or restored, as you have stated in your tests.
I want to get notified whenever my iOS device is connected/disconnected to internet through my app. This is possible in android by using broadcast receiver. Is there any broadcast receiver like component in iOS through which I get notification for detecting change in internet connection?
I have searched through internet a lot but did not get any solutions.
You can refer to Reachability API. You might want to run this as a silent background thread and alert once there is a change in network connectivity.
I have read in the App Store Submission Tips that
If your application provides functionality that requires access to a network, it's very important that your code include a customer alert or notification when the network is not available.
In fact, there are two entries in that submission tips list concerning Reachability (Don't Forget to Include Network Error Alerts in Your Code and Be Sure to Provide Network Error Messages). But I don´t know how an app is expected to manage Reachability actually:
1) Should you listen for network reachability status changes, and notify the user every time the network is not available? Or should you check for the reachability of the network when you are about to perform a network operation, and then notify if needed? Or both?
2) Is it required to check for the reachability of the certain remote hosts you need to call in your network operations, or checking for network availability (either WiFi or WWAN) will be enough?
I'd appreciate some guidance from someone who had already successfully submitted an app to the App Store.
Thanks in advance
1) If your app only needs to access the network when the user specifically chooses to do something, then checking at that time is fine. Depending on your app, you might want to listen for changes in reachability and update your UI based on the current status (such as disable a button if there is no network connection). Don't pop alerts every time the reachability status changes. That would be annoying.
2) Depends on your needs. If you have something that always connects to a specific host then checking that host would be good. If the access can be to anything on the Internet then simply check for Internet access.
All of this can be done with the Reachability class from the "Reachability" sample app.
About Alamofire -- NetworkReachabilityManager listening network status, I have the following two questions.
1.I need to start listening to the network status in which method?
2.If I want to network status monitoring in - application: didFinishLaunchingWithOptions: method, whether to need to delay?
I hope you can help me?
There is a custom class called Reachability (https://github.com/tonymillion/Reachability)
It works with Grand Central Dispatch so it handles the notifications when connectivity is reached or lost, the author warns you about changing it's name because some apps have been reported as denied during the App Store review process because the SDK has already defined a class with the same name