iOS检测3G或WiFi

Question

我不确定这是否可能，但我有这种情况。

我在UIWebView中显示的网站具有在UISegmentedController中设置链接的功能。该网站可以检测您是在wifi还是3g网络上。

现在，分段控制器指向2个不同的页面： 1-iphone友好的登录屏幕 2-主页，一旦您登录。

现在问题来了：

我能否编写应用程序来检测它是连接WIFI还是3G（我知道您可以做到这一点），然后根据答案转到第1或第2个部分

就像这样：

if (iPhone device is on 3g) {
    Go to Segment 1;
} else {
    Go to Segment 0;
}

- jwknz

---

可能是重复的问题：iphone SDK detect Wifi and Carrier network - Andrejs Cainikovs

Answer 1

使用苹果提供的代码这里

Reachability *reachability = [Reachability reachabilityForInternetConnection];
[reachability startNotifier];

NetworkStatus status = [reachability currentReachabilityStatus];

if(status == NotReachable) 
{
    //No internet
}
else if (status == ReachableViaWiFi)
{
    //WiFi
}
else if (status == ReachableViaWWAN) 
{
    //3G
}

- James Webster

---

在获取网络状态后，你应该调用[reachability stopNotifier]吗？ - zekel

这取决于您使用此代码的范围。如果这只是在一个方法中，reachability将会超出作用域并且在该方法结束时被释放，stopNotifier将会隐式调用。 - James Webster

感谢您的编辑。我猜这是使用了“ReachableViaWifiNetwork”的旧版本代码。 - James Webster

还可以在 CocoaPods 上获取：pod 'Reachability'。 - Stewart Macdonald

有人知道如何判断是哪种广域网吗？3G、4G、LTE？ - David Bemerguy

Answer 2

如果您不想导入Reachability库或处理通知器，您可以使用这个简单的同步方法：

typedef enum {
    ConnectionTypeUnknown,
    ConnectionTypeNone,
    ConnectionType3G,
    ConnectionTypeWiFi
} ConnectionType;


+ (ConnectionType)connectionType
{
    SCNetworkReachabilityRef reachability = SCNetworkReachabilityCreateWithName(NULL, "8.8.8.8");
    SCNetworkReachabilityFlags flags;
    BOOL success = SCNetworkReachabilityGetFlags(reachability, &flags);
    CFRelease(reachability);
    if (!success) {
        return ConnectionTypeUnknown;
    }
    BOOL isReachable = ((flags & kSCNetworkReachabilityFlagsReachable) != 0);
    BOOL needsConnection = ((flags & kSCNetworkReachabilityFlagsConnectionRequired) != 0);
    BOOL isNetworkReachable = (isReachable && !needsConnection);

    if (!isNetworkReachable) {
        return ConnectionTypeNone;
    } else if ((flags & kSCNetworkReachabilityFlagsIsWWAN) != 0) {
        return ConnectionType3G;
    } else {
        return ConnectionTypeWiFi;
    }
}

- Pavel Alexeev

---

要使用这个有用的代码，您必须 #import <SystemConfiguration/SystemConfiguration.h> 并链接到 SystemConfiguration.framework。 - Dirk

Answer 3

导入苹果的Reachability并尝试以下操作：

#import "Reachability.h"
#import <CoreTelephony/CTTelephonyNetworkInfo.h>

//Try this
Reachability *reachability = [Reachability reachabilityForInternetConnection];
    [reachability startNotifier];

    NetworkStatus status = [reachability currentReachabilityStatus];

    if(status == NotReachable)
    {
       NSLog(@"none");
        //No internet
    }
    else if (status == ReachableViaWiFi)
    {
        NSLog(@"Wifi");
        //WiFi
    }
    else if (status == ReachableViaWWAN)
    {
        NSLog(@"WWAN");


    //connection type
    CTTelephonyNetworkInfo *netinfo = [[CTTelephonyNetworkInfo alloc] init];
    _carrier = [[netinfo subscriberCellularProvider] carrierName];

    if ([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyGPRS]) {
        NSLog(@"2G");
    } else if ([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyEdge]) {
        NSLog(@"2G");
    } else if ([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyWCDMA]) {
        NSLog(@"3G");
    } else if ([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyHSDPA]) {
        NSLog(@"3G");
    } else if ([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyHSUPA]) {
        NSLog(@"3G");
    } else if ([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyCDMA1x]) {
        NSLog(@"2G");
    } else if ([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyCDMAEVDORev0]) {
        NSLog(@"3G");
    } else if ([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyCDMAEVDORevA]) {
        NSLog(@"3G");
    } else if ([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyCDMAEVDORevB]) {
        NSLog(@"3G");
    } else if ([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyeHRPD]) {
        NSLog(@"3G");
    } else if ([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyLTE]) {
        NSLog(@"4G");
    }

    }

参考资料（链接可能在未来失效）：

• iOS检测3G或WiFi
• 检测运营商连接类型（3G / EDGE / GPRS）
  
• 1G、2G、3G、4G和5G之间有什么区别？
  
• CDMA2000
  
• 维基百科2G
  

• CDMA和WCDMA网络sim卡之间有什么区别？
  

• 什么是“EV-DO Rev. A”？

- Mohammad Zaid Pathan

---

首先添加SystemConfiguration框架，打开此链接 https://github.com/tonymillion/Reachabilit' 并下载该文件，并将 Reachability.h 和 .m 文件复制到您的项目中，导入 #import "Reachability.h"，#import <CoreTelephony/CTTelephonyNetworkInfo.h>，最后复制粘贴上面的代码..... - Marking

Answer 4

当使用 iOS 12 或更新版本时，您可以使用 NWPathMonitor 代替旧版的 Reachability 类:

import Network // Put this on top of your class

let monitor = NWPathMonitor()

monitor.pathUpdateHandler = { path in
    if path.status != .satisfied {
        // Not connected
    }
    else if path.usesInterfaceType(.cellular) {
        // Cellular 3/4/5g connection
    }
    else if path.usesInterfaceType(.wifi) {
        // Wi-fi connection
    }
    else if path.usesInterfaceType(.wiredEthernet) {
        // Ethernet connection
    }
}

monitor.start(queue: DispatchQueue.global(qos: .background))

- Ely

---

我们能否像使用 Reachability.reachabilityWithHostName 一样定义要测试的主机？ - agirault

Answer 5

我制作了一个基于块的可达性包装器，它剥去了所有过时的类C可达性代码，并将其改为更加Cocoa风格的形式。

用法如下：

[EPPZReachability reachHost:hostNameOrIPaddress
               completition:^(EPPZReachability *reachability)
{
    if (reachability.reachableViaCellular) [self doSomeLightweightStuff];
}];

请看eppz!blog上的使用块实现的可达性，或者直接从GitHub上的eppz!reachability获取。它也适用于IP地址，这是一个相当罕见的可达性包装功能。

- Geri Borbás

---

为什么要“截屏”？ - QED

我从博客文章“Candy for Eyes”中获得了这个信息。 - Geri Borbás

Answer 6

对于 Swift，我们可以使用：

func getNetworkType()->String {
    do{
        let reachability:Reachability = try Reachability.reachabilityForInternetConnection()
        do{
            try reachability.startNotifier()
            let status = reachability.currentReachabilityStatus
            if(status == .NotReachable){
                return ""
            }else if (status == .ReachableViaWiFi){
                return "Wifi"
            }else if (status == .ReachableViaWWAN){
                let networkInfo = CTTelephonyNetworkInfo()
                let carrierType = networkInfo.currentRadioAccessTechnology
                switch carrierType{
                case CTRadioAccessTechnologyGPRS?,CTRadioAccessTechnologyEdge?,CTRadioAccessTechnologyCDMA1x?: return "2G"
                case CTRadioAccessTechnologyWCDMA?,CTRadioAccessTechnologyHSDPA?,CTRadioAccessTechnologyHSUPA?,CTRadioAccessTechnologyCDMAEVDORev0?,CTRadioAccessTechnologyCDMAEVDORevA?,CTRadioAccessTechnologyCDMAEVDORevB?,CTRadioAccessTechnologyeHRPD?: return "3G"
                case CTRadioAccessTechnologyLTE?: return "4G"
                default: return ""
                }

                // Get carrier name

            }else{
                return ""
            }
        }catch{
            return ""
        }

    }catch{
        return ""
    }


}

- Sachin Agarwal

Answer 7

类方法如下所示

+(NSString*)connectedNetworkType {
     Reachability *reachability = [Reachability reachabilityForInternetConnection];
        [reachability startNotifier];

        NetworkStatus status = [reachability currentReachabilityStatus];

        if(status == NotReachable) {
            NSLog(@"none");
            //No internet
        }
        else if (status == ReachableViaWiFi) {
            NSLog(@"Wifi");
            //WiFi
            return @"Wifi";
        }
        else if (status == ReachableViaWWAN){
            NSLog(@"WWAN");
            //connection type
            CTTelephonyNetworkInfo *netinfo = [[CTTelephonyNetworkInfo alloc] init];
            //    _carrier = [[netinfo subscriberCellularProvider] carrierName];
            if (([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyGPRS])
                ||([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyEdge])
                ||([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyCDMA1x])) {
                NSLog(@"2G");
                return @"2G";
            }
            else if (([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyWCDMA])
                     ||([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyHSDPA])
                     ||([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyHSUPA])
                     ||([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyCDMAEVDORev0])
                     ||([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyCDMAEVDORevA])
                     ||([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyCDMAEVDORevB])
                     ||([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyeHRPD])){
                NSLog(@"3G");
                return @"3G";
            }
            else if ([netinfo.currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyLTE]) {
                NSLog(@"4G");
                return @"4G";

            }
        }
        return @"-1";//default unknown
}

- HDdeveloper

Answer 8

#import <ifaddrs.h>
#import <arpa/inet.h>

BOOL CheckWiFi() {

    struct ifaddrs *interfaces = NULL;
    struct ifaddrs *temp_addr = NULL;

    BOOL hasWifi = NO;

    int err = getifaddrs(&interfaces);
    if(err == 0) {

        temp_addr = interfaces; 

        while(temp_addr) {

            if(temp_addr->ifa_addr->sa_family == AF_INET) {

                struct sockaddr_in *addr = (struct sockaddr_in *)temp_addr->ifa_addr;

                if(memcmp(temp_addr->ifa_name, "en", 2) == 0) {
                    hasWifi = YES;
                    break;
                }
            }

            temp_addr = temp_addr->ifa_next;
        }
    }

    freeifaddrs(interfaces);
    return hasWifi;
}

为了检查您是否处于WiFi状态，这样可以避免进行连接时的昂贵检查。检查ifa_name "bridge"以检查互联网共享。

- Hogdotmac

Answer 9

基于多个答案，支持5G的Swift版本。

import Foundation
import SystemConfiguration
import CoreTelephony

/// Returns current network connection type(e.g. 4G, WIFI). It may take some time; so there is the suggestion not to use it on the main queue.
static func connectionType() -> ConnectionType {
    guard let reachability = SCNetworkReachabilityCreateWithName(kCFAllocatorDefault, "www.google.com") else {
        return .noConnection
    }
    
    var flags = SCNetworkReachabilityFlags()
    SCNetworkReachabilityGetFlags(reachability, &flags)
    
    guard flags.contains(.reachable) else { return .noConnection }
    guard flags.contains(.isWWAN) else { return .wifi }
    
    let networkInfo = CTTelephonyNetworkInfo()
    let carrierTypeName: String?
    
    if #available(iOS 12.0, *) {
        carrierTypeName = networkInfo.serviceCurrentRadioAccessTechnology?.first?.value
    } else {
        carrierTypeName = networkInfo.currentRadioAccessTechnology
    }
    
    if #available(iOS 14.0, *) {
        switch carrierTypeName {
            case CTRadioAccessTechnologyNR, CTRadioAccessTechnologyNRNSA:
                return .cellular5G
            default:
                break
        }
    }
    
    switch carrierTypeName {
        case CTRadioAccessTechnologyGPRS, CTRadioAccessTechnologyEdge, CTRadioAccessTechnologyCDMA1x:
            return .cellular2G
        case CTRadioAccessTechnologyLTE:
            return .cellular4G
        case nil:
            return .unknown
        default:
            return .cellular3G
    }
}

enum ConnectionType: CustomStringConvertible {
    case noConnection, unknown, wifi, cellular2G, cellular3G, cellular4G, cellular5G
        
    var description: String {
        switch self {
            case .noConnection:
                return "no connection"
            case .unknown:
                return "unknown"
            case .wifi:
                return "WIFI"
            case .cellular2G:
                return "2G"
            case .cellular3G:
                return "3G"
            case .cellular4G:
                return "LTE"
            case .cellular5G:
                return "5G"
        }
    }
}

- Dmytro Shvetsov

Answer 10

如果您正在使用Xamarin或Monotouch，您可以使用来自Xamarin GitHub存储库的适配器类Reachability：

https://github.com/xamarin/monotouch-samples/blob/master/ReachabilitySample/reachability.cs

因此，将其添加到您的项目中并调用 Reachability.InternetConnectionStatus()

- orafaelreis

---

链接已损坏。 - Christopher Stephan