iOS獲取網絡連接狀態

通過AFNetworking獲取的網絡狀態只有未知、無網絡連接、手機自帶網絡、WIFI，需求是需要準確的定位到是WiFi、5G、4G、3G、2G，所以AFNetworking并不能滿足需求，只能通過調用系統SCNetworkReachability跟CTTelephonyNetworkInfo來獲取當前的網絡連接狀態。

#import <SystemConfiguration/SCNetworkReachability.h> #import <CoreTelephony/CTTelephonyNetworkInfo.h>//無網絡 static NSString * notReachable = @"notReachable";#pragma mark --- 獲取當前網絡狀態 - (NSString *)getNetworkType {//創建零地址，0.0.0.0的地址表示查詢本機的網絡連接狀態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;//獲得連接的標志BOOL didRetrieveFlags = SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags);CFRelease(defaultRouteReachability);//如果不能獲取連接標志，則不能連接網絡，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;} }

親測滿足當前需求，如果后續出到6G以及其他網絡頻段，需要增加相應的判斷，返回對應的網絡標識。

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