如何在iOS或macOS上检查活动的Internet连接?

2020/10/26 13:23 · ios ·  · 0评论

我想检查一下我是否在使用Cocoa Touch库的iOS上或在使用Cocoa库的macOS上建立了Internet连接

我想出了一种方法来使用NSURL我这样做的方式似乎有点不可靠(因为即使Google可能有一天会倒闭,依靠第三方也似乎很糟糕),而且我可以检查是否有其他网站的回应(如果Google没有回应),的确看起来很浪费,而且对我的应用程序来说是不必要的开销。

- (BOOL) connectedToInternet
{
    NSString *URLString = [NSString stringWithContentsOfURL:[NSURL URLWithString:@"http://www.google.com"]];
    return ( URLString != NULL ) ? YES : NO;
}

我做的不stringWithContentsOfURL好吗(更不用说在iOS 3.0和macOS 10.4中已弃用),如果是,那么有什么更好的方法来做到这一点?

重要提示:此检查应始终异步执行。以下大多数答案是同步的,因此请小心,否则将冻结您的应用程序。


迅速

1)通过CocoaPods或迦太基安装:https : //github.com/ashleymills/Reachability.swift

2)通过闭包测试可达性

let reachability = Reachability()!

reachability.whenReachable = { reachability in
    if reachability.connection == .wifi {
        print("Reachable via WiFi")
    } else {
        print("Reachable via Cellular")
    }
}

reachability.whenUnreachable = { _ in
    print("Not reachable")
}

do {
    try reachability.startNotifier()
} catch {
    print("Unable to start notifier")
}

物镜

1)将SystemConfiguration框架添加到项目中,但不必担心将其包含在任何地方

2)将Tony Million的Reachability.h版本添加Reachability.m到项目中(可在此处找到:https : //github.com/tonymillion/Reachability

3)更新界面部分

#import "Reachability.h"

// Add this to the interface in the .m file of your view controller
@interface MyViewController ()
{
    Reachability *internetReachableFoo;
}
@end

4)然后在您可以调用的视图控制器的.m文件中实现此方法

// Checks if we have an internet connection or not
- (void)testInternetConnection
{   
    internetReachableFoo = [Reachability reachabilityWithHostname:@"www.google.com"];

    // Internet is reachable
    internetReachableFoo.reachableBlock = ^(Reachability*reach)
    {
        // Update the UI on the main thread
        dispatch_async(dispatch_get_main_queue(), ^{
            NSLog(@"Yayyy, we have the interwebs!");
        });
    };

    // Internet is not reachable
    internetReachableFoo.unreachableBlock = ^(Reachability*reach)
    {
        // Update the UI on the main thread
        dispatch_async(dispatch_get_main_queue(), ^{
            NSLog(@"Someone broke the internet :(");
        });
    };

    [internetReachableFoo startNotifier];
}

重要提示:Reachability类是最常用的类别中的一个项目,所以你可能会遇到的命名与其他项目冲突。如果发生这种情况,则必须将一对Reachability.hReachability.m文件中的一个重命名为其他名称才能解决该问题。

注意:您使用的域无关紧要。它只是测试通往任何域的网关。

我喜欢保持简单。我这样做的方式是:

//Class.h
#import "Reachability.h"
#import <SystemConfiguration/SystemConfiguration.h>

- (BOOL)connected;

//Class.m
- (BOOL)connected
{
    Reachability *reachability = [Reachability reachabilityForInternetConnection];
    NetworkStatus networkStatus = [reachability currentReachabilityStatus];
    return networkStatus != NotReachable;
}

然后,每当我想查看是否有连接时都使用此:

if (![self connected]) {
    // Not connected
} else {
    // Connected. Do some Internet stuff
}

此方法无需等待更改网络状态即可完成工作。当您要求时,它只是测试状态。

使用Apple的Reachability代码,我创建了一个函数,该函数可以正确地检查这一点,而无需包含任何类。

在您的项目中包括SystemConfiguration.framework。

进行一些进口:

#import <sys/socket.h>
#import <netinet/in.h>
#import <SystemConfiguration/SystemConfiguration.h>

现在只需调用此函数:

/*
Connectivity testing code pulled from Apple's Reachability Example: https://developer.apple.com/library/content/samplecode/Reachability
 */
+(BOOL)hasConnectivity {
    struct sockaddr_in zeroAddress;
    bzero(&zeroAddress, sizeof(zeroAddress));
    zeroAddress.sin_len = sizeof(zeroAddress);
    zeroAddress.sin_family = AF_INET;

    SCNetworkReachabilityRef reachability = SCNetworkReachabilityCreateWithAddress(kCFAllocatorDefault, (const struct sockaddr*)&zeroAddress);
    if (reachability != NULL) {
        //NetworkStatus retVal = NotReachable;
        SCNetworkReachabilityFlags flags;
        if (SCNetworkReachabilityGetFlags(reachability, &flags)) {
            if ((flags & kSCNetworkReachabilityFlagsReachable) == 0)
            {
                // If target host is not reachable
                return NO;
            }

            if ((flags & kSCNetworkReachabilityFlagsConnectionRequired) == 0)
            {
                // If target host is reachable and no connection is required
                //  then we'll assume (for now) that your on Wi-Fi
                return YES;
            }


            if ((((flags & kSCNetworkReachabilityFlagsConnectionOnDemand ) != 0) ||
                 (flags & kSCNetworkReachabilityFlagsConnectionOnTraffic) != 0))
            {
                // ... and the connection is on-demand (or on-traffic) if the
                //     calling application is using the CFSocketStream or higher APIs.

                if ((flags & kSCNetworkReachabilityFlagsInterventionRequired) == 0)
                {
                    // ... and no [user] intervention is needed
                    return YES;
                }
            }

            if ((flags & kSCNetworkReachabilityFlagsIsWWAN) == kSCNetworkReachabilityFlagsIsWWAN)
            {
                // ... but WWAN connections are OK if the calling application
                //     is using the CFNetwork (CFSocketStream?) APIs.
                return YES;
            }
        }
    }

    return NO;
}

而且它已为您测试了iOS 5

这曾经是正确的答案,但现在已经过时,因为您应该订阅通知以获取可达性。此方法同步检查:


您可以使用Apple的Reachability类。它还将允许您检查是否启用了Wi-Fi:

Reachability* reachability = [Reachability sharedReachability];
[reachability setHostName:@"www.example.com"];    // Set your host name here
NetworkStatus remoteHostStatus = [reachability remoteHostStatus];

if (remoteHostStatus == NotReachable) { }
else if (remoteHostStatus == ReachableViaWiFiNetwork) { }
else if (remoteHostStatus == ReachableViaCarrierDataNetwork) { }

SDK并未附带Reachability类,而是该Apple示例应用程序的一部分只需下载它,然后将Reachability.h / m复制到您的项目中即可。另外,您必须将SystemConfiguration框架添加到您的项目中。

这是一个非常简单的答案:

NSURL *scriptUrl = [NSURL URLWithString:@"http://www.google.com/m"];
NSData *data = [NSData dataWithContentsOfURL:scriptUrl];
if (data)
    NSLog(@"Device is connected to the Internet");
else
    NSLog(@"Device is not connected to the Internet");

该网址应指向一个非常小的网站。我在这里使用Google的移动网站,但是如果我有一个可靠的网络服务器,我将上传一个只有一个字符的小文件,以实现最大速度。

如果要检查设备是否以某种方式连接到Internet,我绝对会建议您使用此简单的解决方案。如果您需要了解用户的连接方式,则可以使用“可达性”。

注意:加载网站时,这会暂时阻止您的线程。就我而言,这不是问题,但您应该考虑一下(Brad指出了这一点)。

这是我在应用程序中的操作方法:虽然200状态响应代码不能保证任何功能,但对我来说足够稳定。这不需要像这里发布的NSData答案那样多的负载,因为我只是检查HEAD响应。

SWIFT代码

func checkInternet(flag:Bool, completionHandler:(internet:Bool) -> Void)
{
    UIApplication.sharedApplication().networkActivityIndicatorVisible = true

    let url = NSURL(string: "http://www.google.com/")
    let request = NSMutableURLRequest(URL: url!)

    request.HTTPMethod = "HEAD"
    request.cachePolicy = NSURLRequestCachePolicy.ReloadIgnoringLocalAndRemoteCacheData
    request.timeoutInterval = 10.0

    NSURLConnection.sendAsynchronousRequest(request, queue:NSOperationQueue.mainQueue(), completionHandler:
    {(response: NSURLResponse!, data: NSData!, error: NSError!) -> Void in

        UIApplication.sharedApplication().networkActivityIndicatorVisible = false

        let rsp = response as! NSHTTPURLResponse?

        completionHandler(internet:rsp?.statusCode == 200)
    })
}

func yourMethod()
{
    self.checkInternet(false, completionHandler:
    {(internet:Bool) -> Void in

        if (internet)
        {
            // "Internet" aka Google URL reachable
        }
        else
        {
            // No "Internet" aka Google URL un-reachable
        }
    })
}

Objective-C代码

typedef void(^connection)(BOOL);

- (void)checkInternet:(connection)block
{
    NSURL *url = [NSURL URLWithString:@"http://www.google.com/"];
    NSMutableURLRequest *headRequest = [NSMutableURLRequest requestWithURL:url];
    headRequest.HTTPMethod = @"HEAD";

    NSURLSessionConfiguration *defaultConfigObject = [NSURLSessionConfiguration ephemeralSessionConfiguration];
    defaultConfigObject.timeoutIntervalForResource = 10.0;
    defaultConfigObject.requestCachePolicy = NSURLRequestReloadIgnoringLocalAndRemoteCacheData;

    NSURLSession *defaultSession = [NSURLSession sessionWithConfiguration:defaultConfigObject delegate:self delegateQueue: [NSOperationQueue mainQueue]];

    NSURLSessionDataTask *dataTask = [defaultSession dataTaskWithRequest:headRequest
        completionHandler:^(NSData *data, NSURLResponse *response, NSError *error)
    {
        if (!error && response)
        {
            block([(NSHTTPURLResponse *)response statusCode] == 200);
        }
    }];
    [dataTask resume];
}

- (void)yourMethod
{
    [self checkInternet:^(BOOL internet)
    {
         if (internet)
         {
             // "Internet" aka Google URL reachable
         }
         else
         {
             // No "Internet" aka Google URL un-reachable
         }
    }];
}

Apple提供了示例代码来检查不同类型的网络可用性。另外,iPhone开发人员手册中也有一个示例

注意:有关使用Apple可达性代码的信息,请参阅@KHG关于此答案的评论。

您可以使用Reachability(可在此处使用)。

#import "Reachability.h"

- (BOOL)networkConnection {
    return [[Reachability reachabilityWithHostName:@"www.google.com"] currentReachabilityStatus];
}

if ([self networkConnection] == NotReachable) { /* No Network */ } else { /* Network */ } //Use ReachableViaWiFi / ReachableViaWWAN to get the type of connection.

苹果提供了一个示例应用程序,它可以完成以下操作:

可达性

仅可达性类已更新。您现在可以使用:

Reachability* reachability = [Reachability reachabilityWithHostName:@"www.apple.com"];
NetworkStatus remoteHostStatus = [reachability currentReachabilityStatus];

if (remoteHostStatus == NotReachable) { NSLog(@"not reachable");}
else if (remoteHostStatus == ReachableViaWWAN) { NSLog(@"reachable via wwan");}
else if (remoteHostStatus == ReachableViaWiFi) { NSLog(@"reachable via wifi");}

iOS 5的可达性版本是darkseed / Reachability.h不是我的!=)

这里有一个美观的,使用ARC和GCD的可达性现代化方法:

可达性

如果您使用的AFNetworking是Internet可达性状态,则可以使用其自己的实现。

最好的使用方法AFNetworking是对该AFHTTPClient进行子类化,并使用该类进行网络连接。

使用此方法的优点之一是,blocks当可达性状态更改时,您可以用来设置所需的行为。假设我创建了一个名为的单例子AFHTTPClient(如AFNetworking docs上的“子类注释”所述BKHTTPClient,我将执行以下操作:

BKHTTPClient *httpClient = [BKHTTPClient sharedClient];
[httpClient setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status)
{
    if (status == AFNetworkReachabilityStatusNotReachable) 
    {
    // Not reachable
    }
    else
    {
        // Reachable
    }
}];

您也可以专门使用AFNetworkReachabilityStatusReachableViaWWANAFNetworkReachabilityStatusReachableViaWiFi枚举检查Wi-Fi或WLAN连接此处更多信息)。

我在此讨论中使用了代码,并且看起来工作正常(阅读整个线程!)。

我还没有对每种可能的连接方式(例如ad hoc Wi-Fi)进行详尽的测试。

非常简单...。请尝试以下步骤:

步骤1:SystemConfiguration框架添加到您的项目中。


步骤2:将以下代码导入header文件。

#import <SystemConfiguration/SystemConfiguration.h>

步骤3:使用以下方法

  • 类型1:

    - (BOOL) currentNetworkStatus {
        [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
        BOOL connected;
        BOOL isConnected;
        const char *host = "www.apple.com";
        SCNetworkReachabilityRef reachability = SCNetworkReachabilityCreateWithName(NULL, host);
        SCNetworkReachabilityFlags flags;
        connected = SCNetworkReachabilityGetFlags(reachability, &flags);
        isConnected = NO;
        isConnected = connected && (flags & kSCNetworkFlagsReachable) && !(flags & kSCNetworkFlagsConnectionRequired);
        CFRelease(reachability);
        return isConnected;
    }
    

  • 类型2:

    导入头#import "Reachability.h"

    - (BOOL)currentNetworkStatus
    {
        Reachability *reachability = [Reachability reachabilityForInternetConnection];
        NetworkStatus networkStatus = [reachability currentReachabilityStatus];
        return networkStatus != NotReachable;
    }
    

步骤4:使用方法:

- (void)CheckInternet
{
    BOOL network = [self currentNetworkStatus];
    if (network)
    {
        NSLog(@"Network Available");
    }
    else
    {
        NSLog(@"No Network Available");
    }
}
-(void)newtworkType {

 NSArray *subviews = [[[[UIApplication sharedApplication] valueForKey:@"statusBar"] valueForKey:@"foregroundView"]subviews];
NSNumber *dataNetworkItemView = nil;

for (id subview in subviews) {
    if([subview isKindOfClass:[NSClassFromString(@"UIStatusBarDataNetworkItemView") class]]) {
        dataNetworkItemView = subview;
        break;
    }
}


switch ([[dataNetworkItemView valueForKey:@"dataNetworkType"]integerValue]) {
    case 0:
        NSLog(@"No wifi or cellular");
        break;

    case 1:
        NSLog(@"2G");
        break;

    case 2:
        NSLog(@"3G");
        break;

    case 3:
        NSLog(@"4G");
        break;

    case 4:
        NSLog(@"LTE");
        break;

    case 5:
        NSLog(@"Wifi");
        break;


    default:
        break;
}
}
- (void)viewWillAppear:(BOOL)animated
{
    NSString *URL = [NSString stringWithContentsOfURL:[NSURL URLWithString:@"http://www.google.com"]];

    return (URL != NULL ) ? YES : NO;
}

或使用Reachability类

有两种方法可以使用iPhone SDK检查Internet可用性:

1.检查Google页面是否打开。

2.可达性等级

有关更多信息,请参阅可达性(Apple Developer)。

使用http://huytd.github.io/datatify/这比添加库和自己编写代码要容易得多。

第一:添加CFNetwork.framework框架

代码ViewController.m

#import "Reachability.h"

- (void)viewWillAppear:(BOOL)animated
{
    Reachability *r = [Reachability reachabilityWithHostName:@"www.google.com"];
    NetworkStatus internetStatus = [r currentReachabilityStatus];

    if ((internetStatus != ReachableViaWiFi) && (internetStatus != ReachableViaWWAN))
    {
        /// Create an alert if connection doesn't work
        UIAlertView *myAlert = [[UIAlertView alloc]initWithTitle:@"No Internet Connection"   message:NSLocalizedString(@"InternetMessage", nil)delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil];
        [myAlert show];
        [myAlert release];
    }
    else
    {
         NSLog(@"INTERNET IS CONNECT");
    }
}

首先下载可到达性类,然后将X可访问性和可到达性文件放在Xcode中

最好的方法是制作一个通用的Functions类(NSObject),以便可以在任何类中使用它。这是网络连接可达性检查的两种方法:

+(BOOL) reachabiltyCheck
{
    NSLog(@"reachabiltyCheck");
    BOOL status =YES;
    [[NSNotificationCenter defaultCenter] addObserver:self
                                          selector:@selector(reachabilityChanged:)
                                          name:kReachabilityChangedNotification
                                          object:nil];
    Reachability * reach = [Reachability reachabilityForInternetConnection];
    NSLog(@"status : %d",[reach currentReachabilityStatus]);
    if([reach currentReachabilityStatus]==0)
    {
        status = NO;
        NSLog(@"network not connected");
    }
    reach.reachableBlock = ^(Reachability * reachability)
    {
        dispatch_async(dispatch_get_main_queue(), ^{
        });
    };
    reach.unreachableBlock = ^(Reachability * reachability)
    {
        dispatch_async(dispatch_get_main_queue(), ^{
        });
    };
    [reach startNotifier];
    return status;
}

+(BOOL)reachabilityChanged:(NSNotification*)note
{
    BOOL status =YES;
    NSLog(@"reachabilityChanged");
    Reachability * reach = [note object];
    NetworkStatus netStatus = [reach currentReachabilityStatus];
    switch (netStatus)
    {
        case NotReachable:
            {
                status = NO;
                NSLog(@"Not Reachable");
            }
            break;

        default:
            {
                if (!isSyncingReportPulseFlag)
                {
                    status = YES;
                    isSyncingReportPulseFlag = TRUE;
                    [DatabaseHandler checkForFailedReportStatusAndReSync];
                }
            }
            break;
    }
    return status;
}

+ (BOOL) connectedToNetwork
{
    // Create zero addy
    struct sockaddr_in zeroAddress;
    bzero(&zeroAddress, sizeof(zeroAddress));
    zeroAddress.sin_len = sizeof(zeroAddress);
    zeroAddress.sin_family = AF_INET;

    // Recover reachability flags
    SCNetworkReachabilityRef defaultRouteReachability = SCNetworkReachabilityCreateWithAddress(NULL, (struct sockaddr *)&zeroAddress);
    SCNetworkReachabilityFlags flags;
    BOOL didRetrieveFlags = SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags);
    CFRelease(defaultRouteReachability);
    if (!didRetrieveFlags)
    {
        NSLog(@"Error. Could not recover network reachability flags");
        return NO;
    }
    BOOL isReachable = flags & kSCNetworkFlagsReachable;
    BOOL needsConnection = flags & kSCNetworkFlagsConnectionRequired;
    BOOL nonWiFi = flags & kSCNetworkReachabilityFlagsTransientConnection;
    NSURL *testURL = [NSURL URLWithString:@"http://www.apple.com/"];
    NSURLRequest *testRequest = [NSURLRequest requestWithURL:testURL  cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:20.0];
    NSURLConnection *testConnection = [[NSURLConnection alloc] initWithRequest:testRequest delegate:self];
    return ((isReachable && !needsConnection) || nonWiFi) ? (testConnection ? YES : NO) : NO;
}

现在,您可以通过调用此类方法检查任何类中的网络连接。

还有另一种使用iPhone SDK检查Internet连接的方法。

尝试为网络连接实现以下代码。

#import <SystemConfiguration/SystemConfiguration.h>
#include <netdb.h>

/**
     Checking for network availability. It returns
     YES if the network is available.
*/
+ (BOOL) connectedToNetwork
{

    // Create zero addy
    struct sockaddr_in zeroAddress;
    bzero(&zeroAddress, sizeof(zeroAddress));
    zeroAddress.sin_len = sizeof(zeroAddress);
    zeroAddress.sin_family = AF_INET;

    // Recover reachability flags
    SCNetworkReachabilityRef defaultRouteReachability =
        SCNetworkReachabilityCreateWithAddress(NULL, (struct sockaddr *)&zeroAddress);
    SCNetworkReachabilityFlags flags;

    BOOL didRetrieveFlags = SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags);
    CFRelease(defaultRouteReachability);

    if (!didRetrieveFlags)
    {
        printf("Error. Could not recover network reachability flags\n");
        return NO;
    }

    BOOL isReachable = ((flags & kSCNetworkFlagsReachable) != 0);
    BOOL needsConnection = ((flags & kSCNetworkFlagsConnectionRequired) != 0);

    return (isReachable && !needsConnection) ? YES : NO;
}

我发现它很容易使用库SimplePingHelper

示例代码:chrishulbert / SimplePingHelperGitHub

  1. 下载可达性文件https://gist.github.com/darkseed/1182373

  2. CFNetwork.framework在框架中添加和“ SystemConfiguration.framework”

  3. 执行#import“ Reachability.h”

第一:添加CFNetwork.framework框架

代码ViewController.m

- (void)viewWillAppear:(BOOL)animated
{
    Reachability *r = [Reachability reachabilityWithHostName:@"www.google.com"];
    NetworkStatus internetStatus = [r currentReachabilityStatus];

    if ((internetStatus != ReachableViaWiFi) && (internetStatus != ReachableViaWWAN))
    {
        /// Create an alert if connection doesn't work
        UIAlertView *myAlert = [[UIAlertView alloc]initWithTitle:@"No Internet Connection"   message:NSLocalizedString(@"InternetMessage", nil)delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil];
        [myAlert show];
        [myAlert release];
    }
    else
    {
         NSLog(@"INTERNET IS CONNECT");
    }
}

迅捷3 /迅捷4

您必须先导入

import SystemConfiguration

您可以通过以下方法检查互联网连接

func isConnectedToNetwork() -> Bool {

    var zeroAddress = sockaddr_in()
    zeroAddress.sin_len = UInt8(MemoryLayout.size(ofValue: zeroAddress))
    zeroAddress.sin_family = sa_family_t(AF_INET)

    let defaultRouteReachability = withUnsafePointer(to: &zeroAddress) {
        $0.withMemoryRebound(to: sockaddr.self, capacity: 1) {zeroSockAddress in
            SCNetworkReachabilityCreateWithAddress(nil, zeroSockAddress)
        }
    }

    var flags = SCNetworkReachabilityFlags()
    if !SCNetworkReachabilityGetFlags(defaultRouteReachability!, &flags) {
        return false
    }
    let isReachable = (flags.rawValue & UInt32(kSCNetworkFlagsReachable)) != 0
    let needsConnection = (flags.rawValue & UInt32(kSCNetworkFlagsConnectionRequired)) != 0
    return (isReachable && !needsConnection)

}

可达性类是确定以找出是否Internet连接可用的设备或不...

但是在访问Intranet资源的情况下

使用可达性类对Intranet服务器执行ping操作始终返回true。

因此,在这种情况下,一种快速的解决方案是在服务上创建一个pingme与其他Web方法一起调用的Web方法pingme应该返回的东西。

所以我在常用功能上写了以下方法

-(BOOL)PingServiceServer
{
    NSURL *url=[NSURL URLWithString:@"http://www.serveraddress/service.asmx/Ping"];

    NSMutableURLRequest *urlReq=[NSMutableURLRequest requestWithURL:url];

    [urlReq setTimeoutInterval:10];

    NSURLResponse *response;

    NSError *error = nil;

    NSData *receivedData = [NSURLConnection sendSynchronousRequest:urlReq
                                                 returningResponse:&response
                                                             error:&error];
    NSLog(@"receivedData:%@",receivedData);

    if (receivedData !=nil)
    {
        return YES;
    }
    else
    {
        NSLog(@"Data is null");
        return NO;
    }
}

上面的方法对我来说非常有用,因此每当我尝试向服务器发送一些数据时,我总是使用此低超时URLRequest来检查Intranet资源的可访问性。

自己做到这一点非常简单。以下方法将起作用。只是要确保不允许使用名称传递HTTP,HTTPS等主机名协议。

-(BOOL)hasInternetConnection:(NSString*)urlAddress
{
    SCNetworkReachabilityRef ref = SCNetworkReachabilityCreateWithName(kCFAllocatorDefault, [urlAddress UTF8String]);
    SCNetworkReachabilityFlags flags;
    if (!SCNetworkReachabilityGetFlags(ref, &flags))
    {
        return NO;
    }
    return flags & kSCNetworkReachabilityFlagsReachable;
}

快速,简单,无痛。

除了可访问性之外,您还可以使用Simple Ping帮助程序库它的工作原理非常好,易于集成。

我认为这是最好的答案。

“是”表示已连接。“否”表示断开连接。

#import "Reachability.h"

 - (BOOL)canAccessInternet
{
    Reachability *IsReachable = [Reachability reachabilityForInternetConnection];
    NetworkStatus internetStats = [IsReachable currentReachabilityStatus];

    if (internetStats == NotReachable)
    {
        return NO;
    }
    else
    {
        return YES;
    }
}
  • 步骤1:在您的项目中添加可达性类。
  • 步骤2:导入可达性类
  • 步骤3:建立以下功能

    - (BOOL)checkNetConnection {
        self.internetReachability = [Reachability reachabilityForInternetConnection];
        [self.internetReachability startNotifier];
        NetworkStatus netStatus = [self.internetReachability currentReachabilityStatus];
        switch (netStatus) {
            case NotReachable:
            {
                return NO;
            }
    
            case ReachableViaWWAN:
            {
                 return YES;
            }
    
            case ReachableViaWiFi:
            {
                 return YES;
            }
        }
    }
    
  • 步骤4:调用以下函数:

    if (![self checkNetConnection]) {
        [GlobalFunctions showAlert:@""
                         message:@"Please connect to the Internet!"
                         canBtntitle:nil
                         otherBtnTitle:@"Ok"];
        return;
    }
    else
    {
        Log.v("internet is connected","ok");
    }
    

在(iOS)Xcode 8和Swift 3.0中检查Internet连接可用性

这是检查网络可用性的简单方法,就像我们的设备是否连接到任何网络一样。我已经设法将其翻译为Swift 3.0,并在这里完成了最终代码。现有的Apple Reachability类和其他第三方库似乎过于复杂,无法转换为Swift。

这适用于3G,4G和WiFi连接。

不要忘记将“ SystemConfiguration.framework”添加到项目构建器。

//Create new swift class file Reachability in your project.
import SystemConfiguration
public class InternetReachability {

class func isConnectedToNetwork() -> Bool {
   var zeroAddress = sockaddr_in(sin_len: 0, sin_family: 0, sin_port: 0, sin_addr: in_addr(s_addr: 0), sin_zero: (0, 0, 0, 0, 0, 0, 0, 0))
   zeroAddress.sin_len = UInt8(sizeofValue(zeroAddress))
   zeroAddress.sin_family = sa_family_t(AF_INET)
   let defaultRouteReachability = withUnsafePointer(&zeroAddress) {
          SCNetworkReachabilityCreateWithAddress(nil, UnsafePointer($0)).takeRetainedValue()
   }
   var flags: SCNetworkReachabilityFlags = 0
   if SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags) == 0 {
          return false
   }
   let isReachable = (flags & UInt32(kSCNetworkFlagsReachable)) != 0
   let needsConnection = (flags & UInt32(kSCNetworkFlagsConnectionRequired)) != 0

   return isReachable && !needsConnection
  }
}

// Check network connectivity from anywhere in project by using this code.
 if InternetReachability.isConnectedToNetwork() == true {
         print("Internet connection OK")
  } else {
         print("Internet connection FAILED")
  }
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