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 flagsSCNetworkReachabilityRef 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;}}

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。