如何在iOS中使用CLLocationManager获取当前位置

Question

I can already find the current location using latitude and longitude, but I would also like to be able to find the current location given a zip code.

Here is what I have so far:

.h

#import <MapKit/MapKit.h>
#import <UIKit/UIKit.h>
#import <CoreLocation/CoreLocation.h>


@interface ViewController : UIViewController<CLLocationManagerDelegate>

{

CLLocationManager *locationManager;
 CLLocation *currentLocation;

    IBOutlet UILabel *label1;
    IBOutlet UILabel *lable2;

}
@property (weak, nonatomic) IBOutlet MKMapView *myMapview;
@property (weak, nonatomic) IBOutlet UILabel *label2;
@property (weak, nonatomic) IBOutlet UILabel *lable1;
@end

.m

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad

{

    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    locationManager = [[CLLocationManager alloc]init];



    locationManager.delegate = self;


    locationManager.distanceFilter = kCLDistanceFilterNone;


    locationManager.desiredAccuracy = kCLLocationAccuracyBest;


    [locationManager startUpdatingLocation];


    _myMapview.showsUserLocation = YES;

    [self->locationManager startUpdatingLocation];



    CLLocation *location = [locationManager location];


    CLLocationCoordinate2D coordinate = [location coordinate];


    NSString *latitude = [NSString stringWithFormat:@"%f", coordinate.latitude];
    NSString *longitude = [NSString stringWithFormat:@"%f", coordinate.longitude];

    //NSLog(@”dLatitude : %@”, latitude);
    //NSLog(@”dLongitude : %@”,longitude);
    NSLog(@"MY HOME :%@", latitude);
    NSLog(@"MY HOME: %@ ", longitude);

}

#pragma mark CLLocationManager Delegate
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
    currentLocation = [locations objectAtIndex:0];
    [locationManager stopUpdatingLocation];

    [self->locationManager stopUpdatingLocation];




    NSLog(@"my latitude :%f",currentLocation.coordinate.latitude);

    NSLog(@"my longitude :%f",currentLocation.coordinate.longitude);
    label1.text = [NSString stringWithFormat:@"%.8f", currentLocation.coordinate.longitude];
    lable2.text = [NSString stringWithFormat:@"%.8f", currentLocation.coordinate.latitude];


    NSLog(@"Detected Location : %f, %f", currentLocation.coordinate.latitude, currentLocation.coordinate.longitude);
    CLGeocoder *geocoder = [[CLGeocoder alloc] init] ;
    [geocoder reverseGeocodeLocation:currentLocation
                   completionHandler:^(NSArray *placemarks, NSError *error)
     {
                       if (error)
                       {
                           NSLog(@"Geocode failed with error: %@", error);
                           return;
                       }

NSLog(@"Monday");
                       CLPlacemark *placemark = [placemarks objectAtIndex:0];
                       NSLog(@"placemark.ISOcountryCode %@",placemark.ISOcountryCode);

                   }];
}
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{
    NSLog(@"didUpdateToLocation: %@", newLocation);
    CLLocation *currentLocation = newLocation;

    if (currentLocation != nil)
    {

    label1.text = [NSString stringWithFormat:@"%.8f", currentLocation.coordinate.longitude];
    lable2.text = [NSString stringWithFormat:@"%.8f", currentLocation.coordinate.latitude];
    }
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

Answer 1

Step 1: Import MobileCoreServices framework in .h File

#import <MobileCoreServices/MobileCoreServices.h>

Step 2: Add delegate CLLocationManagerDelegate

@interface yourViewController : UIViewController<CLLocationManagerDelegate>
{
    CLLocationManager *locationManager;
    CLLocation *currentLocation;
}

Step 3: Add this code in class file

- (void)viewDidLoad
{
    [super viewDidLoad];
    [self CurrentLocationIdentifier]; // call this method
}

Step 4: Method to get location

//------------ Current Location Address-----
-(void)CurrentLocationIdentifier
{
    //---- For getting current gps location
    locationManager = [CLLocationManager new];
    locationManager.delegate = self;
    locationManager.distanceFilter = kCLDistanceFilterNone;
    locationManager.desiredAccuracy = kCLLocationAccuracyBest;
    [locationManager startUpdatingLocation];
    //------
}
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
    currentLocation = [locations objectAtIndex:0];
    [locationManager stopUpdatingLocation];
    CLGeocoder *geocoder = [[CLGeocoder alloc] init] ;
    [geocoder reverseGeocodeLocation:currentLocation completionHandler:^(NSArray *placemarks, NSError *error)
     {
         if (!(error))
         {
             CLPlacemark *placemark = [placemarks objectAtIndex:0];
            NSLog(@"\nCurrent Location Detected\n");
             NSLog(@"placemark %@",placemark);
             NSString *locatedAt = [[placemark.addressDictionary valueForKey:@"FormattedAddressLines"] componentsJoinedByString:@", "];
             NSString *Address = [[NSString alloc]initWithString:locatedAt];
             NSString *Area = [[NSString alloc]initWithString:placemark.locality];
             NSString *Country = [[NSString alloc]initWithString:placemark.country];
             NSString *CountryArea = [NSString stringWithFormat:@"%@, %@", Area,Country];
             NSLog(@"%@",CountryArea);
         }
         else
         {
             NSLog(@"Geocode failed with error %@", error);
             NSLog(@"\nCurrent Location Not Detected\n");
             //return;
             CountryArea = NULL;
         }
         /*---- For more results 
         placemark.region);
         placemark.country);
         placemark.locality); 
         placemark.name);
         placemark.ocean);
         placemark.postalCode);
         placemark.subLocality);
         placemark.location);
          ------*/
     }];
}

Answer 2

Here is a code to get user current location using block

1) #import <CoreLocation/CoreLocation.h>

2) <CLLocationManagerDelegate>

3) in .h file

//Location
typedef void(^locationBlock)();

//Location
-(void)GetCurrentLocation_WithBlock:(void(^)())block;

@property (nonatomic, strong) locationBlock _locationBlock;
@property (nonatomic,copy)CLLocationManager *locationManager;
@property (nonatomic)CLLocationCoordinate2D coordinate;
@property (nonatomic,strong) NSString *current_Lat;
@property (nonatomic,strong) NSString *current_Long;

4) in .m file

#pragma mark - CLLocationManager
-(void)GetCurrentLocation_WithBlock:(void(^)())block {
    self._locationBlock = block;
    _locationManager = [[CLLocationManager alloc] init];
    [_locationManager setDelegate:self];
    [_locationManager setDistanceFilter:kCLDistanceFilterNone];
    [_locationManager setDesiredAccuracy:kCLLocationAccuracyBest];
    if (IS_OS_8_OR_LATER) {
        if ([_locationManager respondsToSelector:@selector(requestWhenInUseAuthorization)]) {
            [_locationManager requestWhenInUseAuthorization];
            [_locationManager requestAlwaysAuthorization];
        }
    }
    [_locationManager startUpdatingLocation];
}

- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations {
    CLLocation *currentLoc=[locations objectAtIndex:0];
    _coordinate=currentLoc.coordinate;
    _current_Lat = [NSString stringWithFormat:@"%f",currentLoc.coordinate.latitude];
    _current_Long = [NSString stringWithFormat:@"%f",currentLoc.coordinate.longitude];
    NSLog(@"here lat %@ and here long %@",_current_Lat,_current_Long);
    self._locationBlock();
    [_locationManager stopUpdatingLocation];
    _locationManager = nil;
}

- (void)locationManager:(CLLocationManager *)manager
       didFailWithError:(NSError *)error {
}

5) Call function

- (void)viewDidLoad {
    [super viewDidLoad];
    [self GetCurrentLocation_WithBlock:^{
        NSLog(@"Lat ::%f,Long ::%f",[self.current_Lat floatValue],[self.current_Long floatValue]);
    }];
}

6) And add below line to .plist

Any one or both of below keys needs to be added in Info.plist file.

NSLocationWhenInUseUsageDescription
NSLocationAlwaysUsageDescription

Answer 3

You can call Google APIs Maps service to get the location using zipcode:

Just enter your zipcode in address={your zipcode} .

Answer 4

if location permissions not asking when you first launch then you cant get your current location .

iOS8 has got us major API changes with the LocationsServices

Assuming [CLLocationManager locationServicesEnabled] return YES,

With the First Launch of the iOS App [both iOS7 and iOS8] - locationMangers(CLLocationManager)