实现方法

 NSString *deviceType = [UIDevice currentDevice].model;
    if ([deviceType isEqualToString:@"iPhone"]) {
        if (iPhoneX) {
            id statusBar = [[UIApplication sharedApplication] valueForKeyPath:@"statusBar"];
            id statusBarView = [statusBar valueForKeyPath:@"statusBar"];
            UIView *foregroundView = [statusBarView valueForKeyPath:@"foregroundView"];
            int signalStrength = 0;
            
            NSArray *subviews = [[foregroundView subviews][2] subviews];
            
            for (id subview in subviews) {
                if ([subview isKindOfClass:NSClassFromString(@"_UIStatusBarWifiSignalView")]) {
                    signalStrength = [[subview valueForKey:@"numberOfActiveBars"] intValue];
                    break;
                }else if ([subview isKindOfClass:NSClassFromString(@"_UIStatusBarStringView")]) {
                    signalStrength = [[subview valueForKey:@"numberOfActiveBars"] intValue];
                    break;
                }
            }
            
            CTTelephonyNetworkInfo *telephonyInfo = [[CTTelephonyNetworkInfo alloc] init];
            CTCarrier *carrier = [telephonyInfo subscriberCellularProvider];
            
            return carrier;
            
        } else {
            
            UIApplication *app = [UIApplication sharedApplication];
            NSArray *subviews = [[[app valueForKey:@"statusBar"] valueForKey:@"foregroundView"] subviews];
            NSString *dataNetworkItemView = nil;
            int signalStrength = 0;
            
            for (id subview in subviews) {
                
                if([subview isKindOfClass:[NSClassFromString(@"UIStatusBarDataNetworkItemView") class]] && [[self getNetworkType] isEqualToString:@"WIFI"] && ![[self getNetworkType] isEqualToString:@"NONE"]) {
                    dataNetworkItemView = subview;
                    signalStrength = [[dataNetworkItemView valueForKey:@"_wifiStrengthBars"] intValue];
                    break;
                }
                if ([subview isKindOfClass:[NSClassFromString(@"UIStatusBarSignalStrengthItemView") class]] && ![[self getNetworkType] isEqualToString:@"WIFI"] && ![[self getNetworkType] isEqualToString:@"NONE"]) {
                    dataNetworkItemView = subview;
                    signalStrength = [[dataNetworkItemView valueForKey:@"_signalStrengthRaw"] intValue];
                    break;
                }
            }
            
            CTTelephonyNetworkInfo *telephonyInfo = [[CTTelephonyNetworkInfo alloc] init];
            CTCarrier *carrier = [telephonyInfo subscriberCellularProvider];
            
            /**
             
             [carrier carrierName]
             [carrier mobileCountryCode]
             [carrier mobileNetworkCode]
             [carrier isoCountryCode]
             
             */
            return carrier;
            
        }
    }