I am using readability class to check network availability and it works fine with this code. But in my app I am having approx 25 view that needs to check the network. I need to know that do I have to write pieces of code in every file ? or is there any way to write it once ?
In the code there is 3 methods that I have to implement to check the network status.
any good suggestions ?
Thanks...
You can use this sample application for your requirement. Provided by APPLE.
In this they have kept it under Application Delegate to be available to all the classes.
Hope it helps.
here goes, import the header in the app delegate file.
in applicationDidFinishLaunching add
[[NSNotificationCenter defaultCenter] addObserver: self
selector: #selector(reachabilityChanged:)
name: kReachabilityChangedNotification object: nil];
this means the appDelegate will be informed each time the reachability is changed. you need to implement the following:
add
-(void)reachabilityChanged: (NSNotification* )note {
Reachability* curReach = [note object];
NSParameterAssert([curReach isKindOfClass: [Reachability class]]);
NetworkStatus netStatus = [curReach currentReachabilityStatus];
if(curReach == hostReach)
{
if (netStatus == NotReachable)
{
//no conn
}
else if (netStatus !=NotReachable)
{
//has conn
}
}
}
this is just an overview and you wont learn by just copying and pasting right, the reachability class can give you all you want to know, even they type of connection... so keep playing.
Make a static method in Reachability class like
-(BOOL)isInternetReachable{
//your code to check the internet connectivity
// return yes or no
}
the you can use as simple as
if([Reachability isInternetReachable])
{
///// do ur stuff
}
else{
////show some error message
}
Related
I have a requirement to identify, which connection is active (WiFi or Ethernet) in Iphone programmatically. If, user is using WiFi then I have to display different view controllers in my app.
Please help.
you can use apple provided Reachability class hear bellow example please check this sample code who provide by apple.
http://developer.apple.com/iphone/library/samplecode/Reachability/index.html
you can use it in your Project like bellow steps:-
included Apple's Reachability.h & .m from their Reachability example.
add the SystemConfiguration framework.
when u use it you just called Bellow method:-
Reachability* wifiReach = [[Reachability reachabilityWithHostName: #"www.apple.com"] retain];
NetworkStatus remoteHostStatus = [wifiReach currentReachabilityStatus];
switch (remoteHostStatus)
{
case NotReachable:
{
NSLog(#"Access Not Available");
break;
}
case ReachableViaWWAN:
{
NSLog(#"Reachable WWAN");
break;
}
case ReachableViaWiFi:
{
NSLog(#"Reachable WiFi");
break;
}
}
Hi I have read some posts and see that I can use "reachability" sample from Apple to check if the current device is run on Wi-Fi or cellular and decide if a connection can be fired. However I have a lots of webviews and HTTP calls in my app on different classes, so I am afraid I have to call the check in every single method which will start a connection. I would like to ask if there is any way to check the status of the network and disallow all traffic on cellular? Thanks a lot.
You are looking for the ReachableViaWiFi network status, which is broadcast via NSNotification. You can setup that up in your code like this:
#property (nonatomic, assign) NetworkStatus currentNetStatus;
...
- (void) startListeningForWifi{
Reachability* hostReach = [Reachability reachabilityWithHostName:#"hostName"];
[hostReach startNotifier];
// reachability set up
// Observe the kNetworkReachabilityChangedNotification. When that notification is posted, the
// method "reachabilityChanged" will be called.
[[NSNotificationCenter defaultCenter] addObserver: self selector: #selector(reachabilityChanged:) name: kReachabilityChangedNotification object: nil];
}
- (void)reachabilityChanged: (NSNotification* )note{
Reachability *curReach = [note object];
self.currentNetStatus = [curReach currentReachabilityStatus];
}
Then it's easy to check the currentNetStatus before you make a network call. If that is not equal to ReachableViaWiFi then you are not on wifi.
i read the https://developer.apple.com/library/ios/#samplecode/Reachability/Introduction/Intro.html
my Question is if the www.apple.com is become not active Suddenly..this code will alert me?
or just if my connection fail's?
That's absolutely right.
It will fire off a kReachabilityChangedNotification notification that tells you the new reachability state.
You get the new reachability state something like this :
- (void)reachabilityChanged:(NSNotification *)notification {
Reachability *reachability = notification.object;
if (NotReachable == reachability.currentReachabilityStatus)
NSLog(#"No longer reachable");
}
I am popping a message alerting the user that he/she has lost WIFI/intenet connection. For that, i followed the Reachability example given by apple.
I added the 2 reachability classes, Rechability.h and .m, and i added the codes given in its app delegate to mine as well (an exact replica). This works perfectly.
My problem is that, this message appears only once, i want it to be displayed when it goes to each and every view.
All codes that i am using can be found here. Help
Mmm... Not sure to understand what you expect Rechability does.
This class is designed to get any change in your rechability status. When a change is detected Reachability send a notification, but if nothing changes you won't get any notification.
EDIT: to get your reachability status and to use it later you can add a BOOL (internetIsDown) to the method where you read notification from Reachability.
- (void)checkNetworkStatus:(NSNotification *)notice {
NetworkStatus internetStatus = [internetReachable currentReachabilityStatus];
switch (internetStatus) {
case NotReachable: {
internetIsDown = YES;
break;
} case ReachableViaWiFi: {
internetIsDown = NO;
break;
} case ReachableViaWWAN: {
internetIsDown = NO;
break;
}
}
}
Now you can check for this BOOL value whenever needed and display an alert to the user.
N.B. internetIsDown should be a singleton if you want to access its value from any viewController!!!
I have an application where I have tabs. The root controller registers for reachability messages. An UIAlertView is used to display a warning. This is shown in all parts of the application.
You could call [Reachability reachabilityForInternetConnection] in each view's viewDidAppear method...
But like others have mentioned, it could be kind of annoying to see the same message over and over.
I read there were many problem with the Reachability sample app that apple provided, but now with their new 2.2 implementation it's suppose to work fine.
So I just want an advice before I integrate it into my app instead of my current implementation.
Basically I'm asking 2 question:
Will this code work ? I need to know if internet is available through 3G or WIFI. (If there is a WIFI with no internet, of course I need it to return false)
2.I'm planning to deploy my app on ios 3.0 and above, do I need to perform any adjustments so it won't crash on ios below 4.0 (cause Reachability 2.2 said to be working on ios 4) ?
Thanks alot!!
+ (BOOL) isInternetReachable
{
NetworkStatus status = [[Util sharedReachability] currentReachabilityStatus];
return (status != NotReachable);
}
+ (Reachability*) sharedReachability
{
if (reachability == nil)
{
reachability = [[Reachability reachabilityForInternetConnection] retain];
[reachability startNotifier];
}
return reachability;
}
Yes this code is gonna work. It is right.