Use Reachability in iOS to detect network and iosreachability

Use Reachability in iOS to detect network and iosreachability

If you want to provide a Reeder In the iOS program, or provide offline mode (Evernote) in the absence of a network ). Then you will use the Reachability for network detection.

 

Purpose of writing this article

• Understand what Reachability can do
• Detection 3 network environment
• 2G/3G
• Wifi
• No network
• How to Use notifications
• Single controller
• Multiple Controllers
• Simple functions:
• Use only in wifi

Reachability Overview

Reachablity is a library used for iOS device network environment detection.

• Monitor whether the target network is available
• Monitor the connection mode of the current network
• Monitor connection mode changes

Doc officially provided by Apple

Http://developer.apple.com/library/ios/#samplecode/Reachability/Introduction/Intro.html

 

Github documentation

Https://github.com/tonymillion/Reachability

 

Install

Because Reachability is very common. Add it directly to Supporting Files/networ-Prefix.pch:

 

C code

# Import <Reachability/Reachability. h>

#import <Reachability/Reachability.h>

 

If you do not know what cocoaspod is, check the following:

Http://witcheryne.iteye.com/blog/1873221

 

Use

There is an answer in stackoverflow to explain the reachability usage.

Http://stackoverflow.com/questions/11177066/how-to-use-ios-reachability

• Generally, a Reachability instance is OK.
• Only one Reachability is required for a Controller.

Block

 

C code

-(Void) viewDidLoad

{

[Super viewDidLoad];

DLog (@ "enable www.apple.com network detection ");

Reachability * reach = [Reachability reachabilityWithHostname: @ "www.apple.com"];

DLog (@ "-- current status: % @", reach. currentReachabilityString );

// Start the notifier which will cause the reachability object to retain itself!

[[Nsicationcenter center defacenter center] addObserver: self

Selector: @ selector (reachabilityChanged :)

Name: kReachabilityChangedNotification

Object: nil];

Reach. reachableBlock = ^ (Reachability * reachability)

{

Dispatch_async (dispatch_get_main_queue (), ^ {

Self. blockLabel. text = @ "network available ";

Self. blockLabel. backgroundColor = [UIColor greenColor];

});

};

Reach. unreachableBlock = ^ (Reachability * reachability)

{

Dispatch_async (dispatch_get_main_queue (), ^ {

Self. blockLabel. text = @ "Network unavailable ";

Self. blockLabel. backgroundColor = [UIColor redColor];

});

};

[Reach startNotifier];

}

-(Void) viewDidLoad {[super viewDidLoad]; DLog (@ "enable www.apple.com network detection"); Reachability * reach = [Reachability reachabilityWithHostname: @ "www.apple.com"]; DLog (@ "-- current status: % @", reach. currentReachabilityString); // start the notifier which will cause the reachability object to retain itself! [[Nsicationicationcenter defacenter center] addObserver: self selector: @ selector (reachabilityChanged :) name: kReachabilityChangedNotification object: nil]; reach. reachableBlock = ^ (Reachability * reachability) {dispatch_async (dispatch_get_main_queue (), ^ {self. blockLabel. text = @ "network available"; self. blockLabel. backgroundColor = [UIColor greenColor] ;}) ;}; reach. unreachableBlock = ^ (Reachability * reachability) {dispatch_async (dispatch_get_main_queue (), ^ {self. blockLabel. text = @ "Network unavailable"; self. blockLabel. backgroundColor = [UIColor redColor] ;}; [reach startNotifier];}

 

 

Notification

 

C code

-(Void) viewDidLoad

{

[Super viewDidLoad];

DLog (@ "enable www.apple.com network detection ");

Reachability * reach = [Reachability reachabilityWithHostname: @ "www.apple.com"];

DLog (@ "-- current status: % @", reach. currentReachabilityString );

// Start the notifier which will cause the reachability object to retain itself!

[[Nsicationcenter center defacenter center] addObserver: self

Selector: @ selector (reachabilityChanged :)

Name: kReachabilityChangedNotification

Object: nil];

[Reach startNotifier];

}

-(Void) reachabilityChanged: (NSNotification *) note {

Reachability * reach = [note object];

If (! [Reach isReachable])

{

Self. icationicationlabel. text = @ "Network unavailable ";

Self. icationicationlabel. backgroundColor = [UIColor redColor];

Self. wifiOnlyLabel. backgroundColor = [UIColor redColor];

Self. wwanOnlyLabel. backgroundColor = [UIColor redColor];

Return;

}

Self. icationicationlabel. text = @ "network available ";

Self. icationicationlabel. backgroundColor = [UIColor greenColor];

If (reach. isReachableViaWiFi ){

Self. wifiOnlyLabel. backgroundColor = [UIColor greenColor];

Self. wifiOnlyLabel. text = @ "currently connected via wifi ";

} Else {

Self. wifiOnlyLabel. backgroundColor = [UIColor redColor];

Self. wifiOnlyLabel. text = @ "wifi is not enabled and cannot be used ";

}

If (reach. isReachableViaWWAN ){

Self. wwanOnlyLabel. backgroundColor = [UIColor greenColor];

Self. wwanOnlyLabel. text = @ "currently connected through 2g or 3g ";

} Else {

Self. wwanOnlyLabel. backgroundColor = [UIColor redColor];

Self. wwanOnlyLabel. text = @ "2g or 3g network not used ";

}

}

-(Void) viewDidLoad {[super viewDidLoad]; DLog (@ "enable www.apple.com network detection"); Reachability * reach = [Reachability reachabilityWithHostname: @ "www.apple.com"]; DLog (@ "-- current status: % @", reach. currentReachabilityString); // start the notifier which will cause the reachability object to retain itself! [[Nsicationcenter center defacenter center] addObserver: self selector: @ selector (reachabilityChanged :) name: jsonobject: nil]; [reach startNotifier];}-(void) reachabilityChanged: (NSNotification *) note {Reachability * reach = [note object]; if (! [Reach isReachable]) {self. icationicationlabel. text = @ "Network unavailable"; self. icationicationlabel. backgroundColor = [UIColor redColor]; self. wifiOnlyLabel. backgroundColor = [UIColor redColor]; self. wwanOnlyLabel. backgroundColor = [UIColor redColor]; return;} self. icationicationlabel. text = @ "network available"; self. icationicationlabel. backgroundColor = [UIColor greenColor]; if (reach. isReachableViaWiFi) {self. wifiOnlyLabel. backgroundColor = [UIColor greenColor]; self. wifiOnlyLabel. text = @ "currently connected via wifi";} else {self. wifiOnlyLabel. backgroundColor = [UIColor redColor]; self. wifiOnlyLabel. text = @ "wifi not enabled, not available";} if (reach. isReachableViaWWAN) {self. wwanOnlyLabel. backgroundColor = [UIColor greenColor]; self. wwanOnlyLabel. text = @ "currently connected through 2g or 3g";} else {self. wwanOnlyLabel. backgroundColor = [UIColor redColor]; self. wwanOnlyLabel. text = @ "2g or 3g network not used ";}}

 

 

Appendix demo description enable wifi

Disable wifi status

 

 

Legacy problems
Ios development determines whether the network is enabled

Go to the official website to download his demo. Reachability. Here, Reachability. h and Reachability. m are imported to your project. Hope to adopt
 
IOS oc checks whether mobile network and Wi-Fi are enabled

Use currentReachabilityStatus, A Reachability method, to obtain the enumerated type value and determine whether it is 2. If it is not 2, it is not WiFi.

Enum {

// DDG NetworkStatus Constant Names.
KNotReachable = 0, // Apple's code depends upon 'notreachable' being the same value as 'no '.
KReachableViaWWAN, // Switched order from Apple's enum. WWAN is active before WiFi.
KReachableViaWiFi

};
Typedef uint32_t NetworkStatus;