iOS获取当前网络连接状态WiFi、5G、4G、3G、2G

iOS获取网络连接状态

通过AFNetworking获取的网络状态只有未知、无网络连接、手机自带网络、WIFI，需求是需要准确的定位到是WiFi、5G、4G、3G、2G，所以AFNetworking并不能满足需求，只能通过调用系统SCNetworkReachability跟CTTelephonyNetworkInfo来获取当前的网络连接状态。

#import <SystemConfiguration/SCNetworkReachability.h>
#import <CoreTelephony/CTTelephonyNetworkInfo.h>

//无网络
static NSString * notReachable = @"notReachable";

#pragma mark --- 获取当前网络状态
- (NSString *)getNetworkType {
    
    //创建零地址，0.0.0.0的地址表示查询本机的网络连接状态
    struct sockaddr_storage zeroAddress;
    
    bzero(&zeroAddress, sizeof(zeroAddress));
    zeroAddress.ss_len = sizeof(zeroAddress);
    zeroAddress.ss_family = AF_INET;
    
    // Recover reachability flags
    SCNetworkReachabilityRef defaultRouteReachability = SCNetworkReachabilityCreateWithAddress(NULL, (struct sockaddr *)&zeroAddress);
    SCNetworkReachabilityFlags flags;
    
    //获得连接的标志
    BOOL didRetrieveFlags = SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags);
    CFRelease(defaultRouteReachability);
    
    //如果不能获取连接标志，则不能连接网络，直接返回
    if (!didRetrieveFlags) {
        return notReachable;
    }
    
    BOOL isReachable = ((flags & kSCNetworkFlagsReachable) != 0);
    BOOL needsConnection = ((flags & kSCNetworkFlagsConnectionRequired) != 0);
    if (isReachable && !needsConnection) { }else{
        return notReachable;
    }
    
    
    if ((flags & kSCNetworkReachabilityFlagsConnectionRequired) == kSCNetworkReachabilityFlagsConnectionRequired ) {
        
        return notReachable;
        
    } else if ((flags & kSCNetworkReachabilityFlagsIsWWAN) == kSCNetworkReachabilityFlagsIsWWAN) {
        
        return [self cellularType];
        
    } else {
        return @"WiFi";
    }
    
}

- (NSString *)cellularType {
    
    CTTelephonyNetworkInfo * info = [[CTTelephonyNetworkInfo alloc] init];
    
    NSString *currentRadioAccessTechnology;
    if (@available(iOS 12.1, *)) {
        if (info && [info respondsToSelector:@selector(serviceCurrentRadioAccessTechnology)]) {
            NSDictionary *radioDic = [info serviceCurrentRadioAccessTechnology];
            if (radioDic.allKeys.count) {
                currentRadioAccessTechnology = [radioDic objectForKey:radioDic.allKeys[0]];
            } else {
                return notReachable;
            }
        } else {
            
            return notReachable;
        }
        
    } else {
        
        currentRadioAccessTechnology = info.currentRadioAccessTechnology;
    }
    
    if (currentRadioAccessTechnology) {
        
        if (@available(iOS 14.1, *)) {
            
            if ([currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyNRNSA] || [currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyNR]) {
                
                return @"5G";
                
            }
        }
        
        if ([currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyLTE]) {
            
            return @"4G";
            
        } else if ([currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyWCDMA] || [currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyHSDPA] || [currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyHSUPA] || [currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyCDMAEVDORev0] || [currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyCDMAEVDORevA] || [currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyCDMAEVDORevB] || [currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyeHRPD]) {
            
            return @"3G";
            
        } else if ([currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyEdge] || [currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyGPRS] || [currentRadioAccessTechnology isEqualToString:CTRadioAccessTechnologyCDMA1x]) {
            
            return @"2G";
            
        } else {
            
            return @"Unknow";
        }
        
        
    } else {
        
        return notReachable;
    }
}

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亲测满足当前需求，如果后续出到6G以及其他网络频段，需要增加相应的判断，返回对应的网络标识。