currentRadioAccessTechnology' is deprecated: first deprecated in iOS 12.0

Question

I am new to Objective-C. I have problem with following code. it shows 'currentRadioAccessTechnology' is deprecated: first deprecated in iOS 12.0 and Replace 'currentRadioAccessTechnology' with 'serviceCurrentRadioAccessTechnology' If i replace my code. It gives following error No visible @interface for 'NSDictionary<NSString *,NSString *>' declares the selector 'isEqualToString:'

- (NSString*)w3cConnectionTypeFor:(CDVReachability*)reachability
{
    NetworkStatus networkStatus = [reachability currentReachabilityStatus];

    switch (networkStatus) {
        case NotReachable:
            return @"none";

        case ReachableViaWWAN:
        {
            BOOL isConnectionRequired = [reachability connectionRequired];
            if (isConnectionRequired) {
                return @"none";
            } else {
                if ([[[UIDevice currentDevice] systemVersion] compare:@"7.0" options:NSNumericSearch] != NSOrderedAscending) {
                    CTTelephonyNetworkInfo *telephonyInfo = [CTTelephonyNetworkInfo new];
                    if ([telephonyInfo.serviceCurrentRadioAccessTechnology  isEqualToString:CTRadioAccessTechnologyGPRS]) {
                        return @"2g";
                    } else if ([telephonyInfo.currentRadioAccessTechnology  isEqualToString:CTRadioAccessTechnologyEdge]) {
                        return @"2g";
                    } else if ([telephonyInfo.currentRadioAccessTechnology  isEqualToString:CTRadioAccessTechnologyWCDMA]) {
                        return @"3g";
                    } else if ([telephonyInfo.currentRadioAccessTechnology  isEqualToString:CTRadioAccessTechnologyHSDPA]) {
                        return @"3g";
                    } else if ([telephonyInfo.currentRadioAccessTechnology  isEqualToString:CTRadioAccessTechnologyHSUPA]) {
                        return @"3g";
                    } else if ([telephonyInfo.currentRadioAccessTechnology  isEqualToString:CTRadioAccessTechnologyCDMA1x]) {
                        return @"3g";
                    } else if ([telephonyInfo.currentRadioAccessTechnology  isEqualToString:CTRadioAccessTechnologyCDMAEVDORev0]) {
                        return @"3g";
                    } else if ([telephonyInfo.currentRadioAccessTechnology  isEqualToString:CTRadioAccessTechnologyCDMAEVDORevA]) {
                        return @"3g";
                    } else if ([telephonyInfo.currentRadioAccessTechnology  isEqualToString:CTRadioAccessTechnologyCDMAEVDORevB]) {
                        return @"3g";
                    } else if ([telephonyInfo.currentRadioAccessTechnology  isEqualToString:CTRadioAccessTechnologyeHRPD]) {
                        return @"3g";
                    } else if ([telephonyInfo.currentRadioAccessTechnology  isEqualToString:CTRadioAccessTechnologyLTE]) {
                        return @"4g";
                    }
                }
                return @"cellular";
            }
        }
        case ReachableViaWiFi:
        {
            BOOL isConnectionRequired = [reachability connectionRequired];
            if (isConnectionRequired) {
                return @"none";
            } else {
                return @"wifi";
            }
        }
        default:
            return @"unknown";
    }
}

Answer 1

You need to use something like:

let dict = CTTelephonyNetworkInfo().serviceCurrentRadioAccessTechnology
let firstValue = dict.values.first 

as equivalent to old

serviceCurrentRadioAccessTechnology