由于一直在做IOT方面的作業，所以app跟硬體設備之間的互動就做的特別多，自然而然的手機當前連接的ssid是什么型別的就尤為重要，之前在判斷網路的發現發現xcode12竟然沒有5G相關的key，最近升級到Xcode12.1發現多了CTRadioAccessTechnologyNRNSA和CTRadioAccessTechnologyNR，從而是的判斷當前網路連接型別變得更完善，
NR是New Radio的縮寫，新無線(5G)的意思，
NRNSA表示5G NR的非獨立組網（NSA）模式，
需要匯入頭檔案：
#import <CoreTelephony/CTTelephonyNetworkInfo.h>+ (NSString *)getNetType
{
CTTelephonyNetworkInfo *info = [[CTTelephonyNetworkInfo alloc] init];
NSString *currentStatus = info.currentRadioAccessTechnology;
NSString *currentNet = @"5G";
if ([currentStatus isEqualToString:CTRadioAccessTechnologyGPRS]) {
currentNet = @"GPRS";
}else if ([currentStatus isEqualToString:CTRadioAccessTechnologyEdge]) {
currentNet = @"2.75G EDGE";
}else if ([currentStatus isEqualToString:CTRadioAccessTechnologyWCDMA]){
currentNet = @"3G";
}else if ([currentStatus isEqualToString:CTRadioAccessTechnologyHSDPA]){
currentNet = @"3.5G HSDPA";
}else if ([currentStatus isEqualToString:CTRadioAccessTechnologyHSUPA]){
currentNet = @"3.5G HSUPA";
}else if ([currentStatus isEqualToString:CTRadioAccessTechnologyCDMA1x]){
currentNet = @"2G";
}else if ([currentStatus isEqualToString:CTRadioAccessTechnologyCDMAEVDORev0]){
currentNet = @"3G";
}else if ([currentStatus isEqualToString:CTRadioAccessTechnologyCDMAEVDORevA]){
currentNet = @"3G";
}else if ([currentStatus isEqualToString:CTRadioAccessTechnologyCDMAEVDORevB]){
currentNet = @"3G";
}else if ([currentStatus isEqualToString:CTRadioAccessTechnologyeHRPD]){
currentNet = @"HRPD";
}else if ([currentStatus isEqualToString:CTRadioAccessTechnologyLTE]){
currentNet = @"4G";
}else if (@available(iOS 14.0, *)) {
if ([currentStatus isEqualToString:CTRadioAccessTechnologyNRNSA]){
currentNet = @"5G NSA";
}else if ([currentStatus isEqualToString:CTRadioAccessTechnologyNR]){
currentNet = @"5G";
}
}
return currentNet;
}有網友說，這個API是從14.1起步，而在iOS14.0.1會導致崩潰，由于手頭目前沒有這個系統的設備，所以不能來驗證了，如果有問題，歡迎提出，
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