How to check network 2G or 3G in IOS? [duplicate]

问题:

This question already has answers here:

How do I know whether my iPhone/iPad is connected to 2G or 3G? [duplicate] (3 answers)

Closed 6 years ago.

I want to check if the device has a 2G or 3G connection.

I used Reachability class for network connection check.

回答1:

In iOS 7 Apple provided a new way to get it.

Please read this link. The "Know your Radio" section.

The basic idea is to use the new

currentRadioAccessTechnology

added to the CTTelephonyNetworkInfo class. If you want to get notified everytime the connection changes you can listen for:

CTRadioAccessTechnologyDidChangeNotification

Heres a code snippet took from the provided link:

CTTelephonyNetworkInfo *telephonyInfo = [CTTelephonyNetworkInfo new];
NSLog(@"Current Radio Access Technology: %@", telephonyInfo.currentRadioAccessTechnology);
[NSNotificationCenter.defaultCenter addObserverForName:CTRadioAccessTechnologyDidChangeNotification 
                                            object:nil 
                                             queue:nil 
                                        usingBlock:^(NSNotification *note) 
{
    NSLog(@"New Radio Access Technology: %@", telephonyInfo.currentRadioAccessTechnology);
}];

I hope this helps you.