判断网络环境

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

我下载的是vertion2.2

 

 

开发Web等网络应用程序的时候，需要确认网络环境，连接情况等信息。如果没有处理它们，是不会通过Apple的审查的。

Reachability

Apple 的 例程 Reachability 中介绍了取得/检测网络状态的方法。

在你的程序中使用

1、Reachability 只须将该例程中的 Reachability.h 和 Reachability.m 拷贝到你的工程中； 2、然后将 SystemConfiguration.framework 添加进工程。

Reachability 中定义了3种网络状态。

typedefenum {

NotReachable = 0,//无连接

ReachableViaWiFi,//使用3G/GPRS网络

ReachableViaWWAN//使用WiFi网络

 

} NetworkStatus;

 

简单判断项目连接：

// 是否wifi

+ (BOOL) IsEnableWIFI {

return ([[Reachability reachabilityForLocalWiFi] currentReachabilityStatus] != NotReachable);

}

// 是否网络连接

+ (BOOL) IsEnableConnection {

return ([[Reachability reachabilityForInternetConnection] currentReachabilityStatus] != NotReachable);

}

 

// 是否网络连接

+ (BOOL) IsEnable3G {

return ([[Reachability reachabilityForInternetConnection] currentReachabilityStatus] == ReachableViaWWAN);

}

 

 

下面是监听整个项目网络例子：

/*

File: ReachabilityAppDelegate.m
Abstract: The application's controller.

Version: 2.2

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*/

#import "ReachabilityAppDelegate.h"
#import "Reachability.h"

@implementation ReachabilityAppDelegate

- (void) configureTextField: (UITextField*) textField imageView: (UIImageView*) imageView reachability: (Reachability*) curReach
{
    NetworkStatus netStatus = [curReach currentReachabilityStatus];
    BOOL connectionRequired= [curReach connectionRequired];
    NSString* statusString= @"";
    switch (netStatus)
    {
        case NotReachable:
        {
            statusString = @"Access Not Available";
            imageView.image = [UIImage imageNamed: @"stop-32.png"] ;
            //Minor interface detail- connectionRequired may return yes, even when the host is unreachable.  We cover that up here...
            connectionRequired= NO;  
            break;
        }
            
        case ReachableViaWWAN:
        {
            statusString = @"Reachable WWAN";
            imageView.image = [UIImage imageNamed: @"WWAN5.png"];
            break;
        }
        case ReachableViaWiFi:
        {
             statusString= @"Reachable WiFi";
            imageView.image = [UIImage imageNamed: @"Airport.png"];
            break;
      }
    }
    if(connectionRequired)
    {
        statusString= [NSString stringWithFormat: @"%@, Connection Required", statusString];
    }
    textField.text= statusString;
}

- (void) updateInterfaceWithReachability: (Reachability*) curReach
{
    if(curReach == hostReach)
	{
		[self configureTextField: remoteHostStatusField imageView: remoteHostIcon reachability: curReach];
        NetworkStatus netStatus = [curReach currentReachabilityStatus];
        BOOL connectionRequired= [curReach connectionRequired];

        summaryLabel.hidden =(netStatus != ReachableViaWWAN);
        NSString* baseLabel=  @"";
        if(connectionRequired)
        {
            baseLabel=  @"Cellular data network is available.\n  Internet traffic will be routed through it after a connection is established.";
        }
        else
        {
            baseLabel=  @"Cellular data network is active.\n  Internet traffic will be routed through it.";
        }
        summaryLabel.text= baseLabel;
    }
	if(curReach == internetReach)
	{	
		[self configureTextField: internetConnectionStatusField imageView: internetConnectionIcon reachability: curReach];
	}
	if(curReach == wifiReach)
	{	
		[self configureTextField: localWiFiConnectionStatusField imageView: localWiFiConnectionIcon reachability: curReach];
	}
	
}

//Called by Reachability whenever status changes.
- (void) reachabilityChanged: (NSNotification* )note
{
	Reachability* curReach = [note object];
	NSParameterAssert([curReach isKindOfClass: [Reachability class]]);
	[self updateInterfaceWithReachability: curReach];
}


- (void) applicationDidFinishLaunching: (UIApplication* )application 
{
    #pragma unused(application)
	contentView.backgroundColor = [UIColor groupTableViewBackgroundColor];
    
    summaryLabel.hidden = YES;        
    

    // 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];

    //Change the host name here to change the server your monitoring
    remoteHostLabel.text = [NSString stringWithFormat: @"Remote Host: %@", @"www.apple.com"];
	hostReach = [[Reachability reachabilityWithHostName: @"www.apple.com"] retain];
	[hostReach startNotifier];
	[self updateInterfaceWithReachability: hostReach];
	
    internetReach = [[Reachability reachabilityForInternetConnection] retain];
	[internetReach startNotifier];
	[self updateInterfaceWithReachability: internetReach];

    wifiReach = [[Reachability reachabilityForLocalWiFi] retain];
	[wifiReach startNotifier];
	[self updateInterfaceWithReachability: wifiReach];

	[window makeKeyAndVisible];
    
}
@end