Get Current Location in iOS

Location.md

You use the CoreLocation framework to access location information about your user. You will need to instantiate a CLLocationManager object and call the asynchronous startUpdatingLocation message. You will get callbacks with the user's location via the CLLocationManagerDelegate that you supply.

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NOTE: Please check device location latitude & logitude if you are using simulator means. By defaults its none only.iOS Simulator -> Debug -> Location

Step 1: Import CoreLocation framework

#import <CoreLocation/CoreLocation.h>

Step 2: Add delegate CLLocationManagerDelegate

@interface ViewController ()<CLLocationManagerDelegate>
{
    CLLocationManager *locationManager;
    CLLocation *currentLocation;
    
    CLGeocoder *geocoder;
    CLPlacemark *placemark;
}
@end

Step 3: Add this code in class file

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    locationManager = [[CLLocationManager alloc] init];
    locationManager.delegate = self;
    locationManager.distanceFilter = kCLDistanceFilterNone;
    locationManager.desiredAccuracy = kCLLocationAccuracyBest;
    [locationManager startUpdatingLocation]; // 这里会提示用户获取地理位置的权限
    [locationManager performSelector:@selector(stopUpdatingLocation) withObject:nil afterDelay:60]; // 60 秒后停止监听
}

Step 4: Get location using this method

- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
    currentLocation = [locations lastObject];
    [locationManager stopUpdatingLocation];
    NSLog(@"currentLocation is %@",currentLocation);
}

Step 5: Converting GPS Coordinate into User-readable Address By specify the latitude and longitude of a given location, you can use CLGeocoder to find a user-readable address. The result (i.e. the address) returned by CLGeocoder is saved in a CLPlacemark object.

geocoder = [[CLGeocoder alloc] init];
[geocoder reverseGeocodeLocation:currentLocation completionHandler:^(NSArray *placemarks, NSError *error) {
    if (error == nil && [placemarks count] > 0) {
        placemark = [placemarks lastObject];
        NSString *countryCode = placemark.ISOcountryCode;
        if (countryCode.length == 2) {
            countryCode = [self GetThreeLetterCountryCodeFromTwoLetterCountryCode:countryCode]
            NSLog(@"countryCode is %@", countryCode);
            [locationManager stopUpdatingLocation];
        }
        // 获取想要的信息后停止监听
        [locationManager stopUpdatingLocation];
    } else {
        NSLog(@"%@", error.debugDescription);
    }
} ];

Ref: How can I get current location from user in iOS

Get Three Letter Country Code From Two Letter Country Code

定位出错提示：

- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
{
    NSLog(@"didFailWithError: %@", error);
    UIAlertView *errorAlert = [[UIAlertView alloc]
                               initWithTitle:@"Error" message:@"Failed to Get Your Location" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
    [errorAlert show];
}

Get ISOCurrencyCode from a ISOCountryCode:

NSString *countryCode = @"US";

NSDictionary *components = [NSDictionary dictionaryWithObject:countryCode forKey:NSLocaleCountryCode];
NSString *localeIdent = [NSLocale localeIdentifierFromComponents:components]; 
NSLocale *locale = [[[NSLocale alloc] initWithLocaleIdentifier:localeIdent] autorelease];
NSString *currencyCode = [locale objectForKey: NSLocaleCurrencyCode];

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获取广东省广州市字样的位置：

CLPlacemark *placemark = [placemarks firstObject];
NSString *text = [NSString stringWithFormat:@"%@%@", placemark.administrativeArea, placemark.locality];