ios 判断网络连接方式

NSArray *subviews = [[[[UIApplication sharedApplication] valueForKey:@"statusBar"] valueForKey:@"foregroundView"] subviews];
    NSNumber *dataNetworkItemView = nil;

    for (id subview in subviews) {
        if ([subview isKindOfClass:[NSClassFromString(@"UIStatusBarDataNetworkItemView") class]]) {
            dataNetworkItemView = subview;
            break;
        }
    }

    switch ([[dataNetworkItemView valueForKey:@"dataNetworkType"] integerValue]) {
        case 0:
            //            NSLog(@"No wifi or cellular");
            break;

        case 1:
            //            NSLog(@"2G");
            return @"2G";
            break;

        case 2:
            //            NSLog(@"3G");
            return @"3G";
            break;

        case 3:
            //            NSLog(@"4G");
            return @"4G";
            break;

        case 4:
            //            NSLog(@"LTE");
            return @"LTE";
            break;
            
        case 5:
            //            NSLog(@"Wifi");
            return @"WiFi";
            break;
            
        default:
            break;
    }