Most accurate way to automatically get user's country on iOS?

问题

This question is perhaps as much about human behaviour as programming.

What is the best way of automatically getting the user's country (without asking the user)

It's for a shopping app, so that the correct shopfront gets shown in the app. Imagine, for instance, there are three stores - Japan, US, and France.

There are three ways I can think of doing this:

1. Use a service like http://ipinfo.io/json or http://freegeoip.net/json/ to get the country code.
2. Use the device's carrier code, I'll be able to get the country where they registered their mobile phone.
3. Use their phone's timezone - i.e., they've set their timezone to New York, so their country is US.

回答1:

I would have used the following:

NSString *locale = [[NSLocale currentLocale] localeIdentifier];

That will work for the vast majority of people who are in their own country, and haven't set their locale to some random other country.

回答2:

NSString *countryCode = [[NSLocale currentLocale] objectForKey: NSLocaleCountryCode];

will get you an identifier like e.g. "US" (United States), "ES" (Spain), etc.

回答3:

use NSLocale for fetch country Name

like

 NSString *CodeofCountry = [[NSLocale currentLocale] objectForKey:NSLocaleCountryCode];
NSString *countryName = [[NSLocale currentLocale] displayNameForKey:NSLocaleCountryCode value:CodeofCountry];
NSLog(@" Code:%@ Name:%@",CodeofCountry, countryName);
//Code:IN Name:India

Source Link:

else use CLLocationManager to get current location & CLGeocoder to perform reverse-geocoding. You can get country name

 - (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
    if (locations == nil)
        return;

    self.currentLocation = [locations objectAtIndex:0];
    [self.geocoder reverseGeocodeLocation:self.currentLocation completionHandler:^(NSArray *placemarks, NSError *error)
    {
        if (placemarks == nil)
            return;

        self.currentLocPlacemark = [placemarks objectAtIndex:0];
        NSLog(@"Current country: %@", [self.currentLocPlacemark country]);
        NSLog(@"Current country code: %@", [self.currentLocPlacemark ISOcountryCode]);
    }];
}

else use NSTimeZone,

 NSLog(@"country Name: %@", [NSTimeZone localTimeZone].name);
 NSLog(@"abbrevationbs %@",[NSTimeZone localTimeZone].abbreviation);

来源：https://stackoverflow.com/questions/33784543/most-accurate-way-to-automatically-get-users-country-on-ios