cocoa handoff無法使用 - 如何檢查iOS或MacOS上的活動Internet連接?



handoff失效 (25)

我想檢查一下是否在iOS上使用Cocoa Touch庫或使用Cocoa庫的MacOS上連接到Internet。

我想出了一種使用NSURL 。 我做這件事的方式似乎有點不可靠(因為即使谷歌有一天可能會倒閉,依靠第三方似乎也不好),而且如果谷歌沒有回應,我可以查看其他網站的回复,看起來很浪費,而且在我的應用程序中不必要的開銷。

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

是我做得不好,(更不用說stringWithContentsOfURL已在iOS 3.0和MacOS 10.4中棄用),如果是這樣,有什麼更好的方法來實現這一點?


Answers

Checking the Internet connection availability in (iOS) Xcode 8 , Swift 3.0

This is simple method for checking the network availability like our device is connected to any network or not. I have managed to translate it to Swift 3.0 and here the final code. The existing Apple Reachability class and other third party libraries seemed to be too complicated to translate to Swift.

This works for both 3G,4G and WiFi connections.

Don't forget to add “SystemConfiguration.framework” to your project builder.

//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")
  }

我在這個討論中使用了代碼,它似乎工作正常(閱讀整個主題!)。

我還沒有對每種可以想像的連接進行詳盡的測試(如ad hoc Wi-Fi)。


很簡單....試試這些步驟:

第1步:SystemConfiguration框架添加到您的項目中。

第2步:將以下代碼導入header文件中。

#import <SystemConfiguration/SystemConfiguration.h>

第3步:使用以下方法

  • 類型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;
    }
    
  • 類型2:

    導入標題#import "Reachability.h"

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

第4步:如何使用:

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

I think this one is the best answer.

"Yes" means connected. "No" means disconnected.

#import "Reachability.h"

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

    if (internetStats == NotReachable)
    {
        return NO;
    }
    else
    {
        return YES;
    }
}

我喜歡保持簡單。 我這樣做的方式是:

//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;
}

然後,每當我想查看我是否有連接時,我都會使用它:

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

此方法不會等待更改的網絡狀態才能完成任務。 它只是在您提問時測試狀態。



首先下載可達性類,並將reachability.h和reachabilty.m文件放入Xcode

最好的方法是製作一個通用的函數類(NSObject),以便您可以使用它的任何類。 這些是網絡連接可達性檢查的兩種方法:

+(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;
}

現在您可以通過調用此類方法來檢查任何類中的網絡連接。


要做到這一點非常簡單。 以下方法將起作用。 只要確保不允許使用名稱傳入諸如HTTP,HTTPS等主機名協議。

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

它非常簡單和無痛。


-(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;
}

或者使用Reachability類

有兩種方法可以使用iPhone SDK檢查Internet可用性:

1.檢查Google頁面是否被打開。

2.可達性類

有關更多信息,請參閱可訪問Reachability (Apple Developer)。


使用Apple的Reachability代碼,我創建了一個函數,可以在不需要包含任何類的情況下正確地檢查該函數。

將SystemConfiguration.framework包含在您的項目中。

進行一些導入:

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

現在只需調用這個函數:

/*
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;
}

它的iOS 5已經過測試。


  • Step 1: Add the Reachability class in your Project.
  • Step 2: Import the Reachability class
  • Step 3: Create the below function

    - (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;
            }
        }
    }
    
  • Step 4: Call the function as below:

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

以下是我在應用程序中的操作方式:雖然200狀態響應代碼不能保證任何內容,但對我來說足夠穩定。 這不需要像這裡發布的NSData答案一樣負載,因為我只是檢查HEAD響應。

SWIFT代碼

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

    let url = NSURL(string: "http://www.appleiphonecell.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 Apple's region universal URL reachable
        }
        else
        {
            // No "Internet" aka Apple's region universal URL un-reachable
        }
    })
}

Objective-C代碼

typedef void(^connection)(BOOL);

- (void)checkInternet:(connection)block
{
    NSURL *url = [NSURL URLWithString:@"http://www.appleiphonecell.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 Apple's region universal URL reachable
         }
         else
         {
             // No "Internet" aka Apple's region universal URL un-reachable
         }
    }];
}

這是一個非常簡單的答案:

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");

該網址應該指向一個非常小的網站。 我在這裡使用谷歌的移動網站,但如果我有一個可靠的網絡服務器,我會上傳一個只有一個字符的小文件,以獲得最大速度。

如果檢查設備是否以某種方式連接到互聯網是您想要做的一切,我肯定會推薦使用這個簡單的解決方案。 如果你需要知道用戶如何連接,使用可達性是可行的。

小心:這會在加載網站時暫時阻止您的線程。 在我的情況下,這不是一個問題,但你應該考慮這一點(信貸布拉德指出了這一點)。


您可以使用Re( 可在此處 )使用Reachability

#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.

這曾經是正確的答案,但它現在已過時,因為您應該訂閱通知以獲取可達性。 該方法同步檢查:

您可以使用Apple的Reachability類。 它也將允許您檢查是否啟用了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) { }

Reachability類不附帶SDK,而是該Apple示例應用程序的一部分。 只需下載它,然後將Reachability.h / m複製到您的項目中。 另外,您必須將SystemConfiguration框架添加到您的項目中。




第一 :在框架中添加CFNetwork.framework

代碼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");
    }
}

只有Reachability類已更新。 您現在可以使用:

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");}

Reachability類可以確定互聯網連接是否可用於設備...

但是在訪問Intranet資源的情況下:

使用可達性類Ping內部網服務器始終返回true。

因此,在這種情況下,快速解決方案是創建一個名為pingme的web方法以及服務上的其他webmethods。 pingme應該返回一些東西。

所以我寫了下面的常用函數的方法

-(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;
    }
}

上述方法對我來說非常有用,所以每當我嘗試向服務器發送一些數據時,我總是使用這個低超時URLRequest來檢查我的Intranet資源的可訪問性。


Import Reachable.h class in your ViewController , and use the following code to check connectivity :

     #define hasInternetConnection [[Reachability reachabilityForInternetConnection] isReachable]
     if (hasInternetConnection){
           // To-do block
     }

Apple提供示例代碼來檢查不同類型的網絡可用性。 另外在iPhone開發者食譜中有一個example

注意:請參閱@ KHG對此答案的評論,內容涉及使用Apple的可達性代碼。


Apple提供了一個示例應用程序,它可以完成以下操作

Reachability






ios macos cocoa cocoa-touch reachability