IOS network development network status check

Classes used in network connections:

1. reachability

1. Add the. h and. m Files of Reachability, and then add systemconfiguration. framework.

2. Three Network statuses are defined in reachability:

Typedef num {

Notreachable = 0, // No connection

Reachableviawifi, // use 3g/GPRS network

Reachableviawwan // use WiFi

} Networkstatus;

3. Example:

Reachability * reachability = [reachablity reachabilitywithhostname: @ "www.baidu.com"];

Switch ([reachabilitystatus]) {

Case notreachable:

// Todo

Break;

Case reachableviawifi:

// Todo

Break;

Case reachableviawwan:

// Todo

Break;

}

4. Check the current network environment

When the program starts, if you want to detect the available network environment, you can use it like this

// Whether WiFi is enabled

+ (Bool) isenablewifi

{

Return ([[reachability reachabiliyforlocalwifi] currentreachabilitystatus]! = Notreachable );

 
}

 

// Whether it is 3 GB

+ (Bool) isenable3g

{

Return ([[reachability reachabiliyforinternetconnetion] currentreachabilitystatus]! = Notreachable );

}

 

Example:

-(Void) viewwillappear :( bool) animated

{

If ([reachability reachabiliyforinternetconnetion]. currentreachabilitystatus = notreachable) & [reachability reachabiliyforlocalwifi]. currentreachabilitystatus = notreachable ))

{

Self. navigationitem. hidesbackbutton = yes;

[Self. navigationitem setleftbarbuttonitem: Nil animated: No];

}

 

}

 

5. Real-time notification of Link Status

Real-time check. When the continuous status changes, users must be notified in a timely manner:

 

Reachability 1.5
// Myappdelegate. h

# Import "reachability"

@ Interface myappdelegate: nsobject <uiapplicationdelegate>
{

}

@ Property networkstatus remotehoststatus;

@ End

 

// Myappdelegate. m

# Import "myappdelegate. H"

@ Implementation myappdelegate
@ Synthesize remotehoststatus;

// Update the network status
-(Void) updatestatus
{
Self. remotehoststatus = [[reachability sharedreachability] remotehoststatus];
}

// Notifies the network status
-(Void) reachabilitychanged :( nsnotification *) Note
{
[Self updatestatus];
If (self. remotehoststatus = notreachable)
{
Uialert * Alert = [[uialertview alloc] initwithtitle: nslocalizedstring (@ "appname", nil)
Message: nslocalizedstring (@ "notreachable", nil );
Delegate: Nil cancelbuttontitle: @ "OK"
Otherbuttontitles: Nil];

[Alert show];
[Alert release];
}
}

// Program initiator to start Network Monitoring
-(Void) applicationdidfinishlaunching :( uiapplication *) Application
{
// Set the site for Network Monitoring
[[Reachability sharedreachability] sethostname: @ "www.baidu.com"];
[[Reachability sharedreachability] setnetworkstatusicationsenabled: Yes];

// Set the notification function when the network status changes
[[Nsicationcenter center defacenter center] addobserver: Self selector: @ selector (reachabilitychanged :)
Name: @ "knetworkreachabilitychangednotification" Object: Nil];
[Self updatestatus];

}

-(Void) dealloc
{
// Delete the notification object
[[Nsicationcenter center defacenter center] removeobserver: Self];
[Window release];
[Super dealloc];
}

 

Reachability 2.0
// Myappdelegate. h

# Import "reachability"
@ Class reachability;
@ Interface myappdelegate: nsobject <uiapplicationdelegate>
{
Reachability * hostreach;
}

@ End
 
// Myappdelegate. m

# Import "myappdelegate. H"

@ Implementation myappdelegate

// Notifies the network status
-(Void) reachabilitychanged :( nsnotification *) Note
{
Reachability * currentreach = [Note object];
Nsparameterassert ([currentreach iskindofclass: [reachability class]);
Networkstatus status = [currentreach currentreachabilitystatus];

If (status = notreachable)
{
Uialert * Alert = [[uialertview alloc] initwithtitle: nslocalizedstring (@ "appname", nil)
Message: nslocalizedstring (@ "notreachable", nil );
Delegate: Nil cancelbuttontitle: @ "yes"
Otherbuttontitles: Nil];

[Alert show];
[Alert release];
}
}

// Program initiator to start Network Monitoring
-(Void) applicationdidfinishlaunching :( uiapplication *) Application
{
//....

// Monitor network conditions
[[Nsicationcenter center defacenter center] addobserver: Self selector: @ selector (reachabilitychanged :)
Name: @ "knetworkreachabilitychangednotification" Object: Nil];
Hostreach = [[reachability reachabilitywithhostname: @ "www.baidu.com"] retain];
// Hostreach startcycler];
//...

}

 

2. Other common classes.

1. nsurl

2. nsurlrequest

3. nsmutableurlrequest is a subclass of nsurlrequest. You can set some request parameters.

4. nsurlresponse

5. nserror