在 IOS 中使用 CLLocation 获取用户当前位置

Posted 2023-02-23

【中文标题】在 IOS 中使用 CLLocation 获取用户当前位置

【英文标题】：Get User Current location using CLLocation in IOS

【发布时间】：2015-12-03 08:08:05

【问题描述】：

我想获取用户当前的位置和地址，我使用CLLocationManager 并添加了核心位置框架。但反应是什么。请分享您的 cmets。

locationManager = [[CLLocationManager alloc] init]; 
locationManager.desiredAccuracy = kCLLocationAccuracyBest; 
locationManager.delegate = self; [locationManager startUpdatingLocation]; 

代表是

(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]; 


(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations  
    CLLocation *currentLocation = locations.first; 
    [locationManager setDelegate:nil]; 
    if (currentLocation != nil)  
        NSString *longitudeLabel = [NSString stringWithFormat:@"%.8f", currentLocation.coordinate.longitude]; 
        NSString *latitudeLabel = [NSString stringWithFormat:@"%.8f", currentLocation.coordinate.latitude];
    

【问题讨论】：

你用的是哪个ios版本？

看下面我的回答

【参考方案1】：

查看我的代码，您可以从当前位置获取地址

- (void)viewDidLoad 
CLGeocoder *ceo;

self.locationManager = [[CLLocationManager alloc]init];
self.locationManager.delegate = self;
[locationManager startUpdatingLocation];




-(void)viewDidAppear:(BOOL)animated
ceo= [[CLGeocoder alloc]init];
[self.locationManager requestWhenInUseAuthorization];
if ([self.locationManager respondsToSelector:@selector(requestWhenInUseAuthorization)]) 
    [self.locationManager requestWhenInUseAuthorization];

    CLLocationCoordinate2D coordinate;

coordinate.latitude=locationManager.location.coordinate.latitude;
coordinate.longitude=locationManager.location.coordinate.longitude;
//CLLocationCoordinate2D  ctrpoint;
//  ctrpoint.latitude = ;
//ctrpoint.longitude =f1;
//coordinate.latitude=23.6999;
//coordinate.longitude=75.000;
MKPointAnnotation *marker = [MKPointAnnotation new];
marker.coordinate = coordinate;
NSLog(@"%f",coordinate.latitude);
//[self.mapView addAnnotation:marker];


CLLocation *loc = [[CLLocation alloc]initWithLatitude:coordinate.latitude longitude:coordinate.longitude
                   ];
[ceo reverseGeocodeLocation:loc
          completionHandler:^(NSArray *placemarks, NSError *error) 
              CLPlacemark *placemark = [placemarks objectAtIndex:0];
              NSLog(@"placemark %@",placemark);
              //String to hold address
              NSString *locatedAt = [[placemark.addressDictionary valueForKey:@"FormattedAddressLines"] componentsJoinedByString:@", "];
              NSLog(@"addressDictionary %@", placemark.addressDictionary);

              NSLog(@"placemark %@",placemark.region);
              NSLog(@"placemark %@",placemark.country);  // Give Country Name
              NSLog(@"placemark %@",placemark.locality); // Extract the city name
              NSLog(@"location %@",placemark.name);
              NSLog(@"location %@",placemark.ocean);
              NSLog(@"location %@",placemark.postalCode);
              NSLog(@"location %@",placemark.subLocality);

              NSLog(@"location %@",placemark.location);
              //Print the location to console
              NSLog(@"I am currently at %@",locatedAt);


              _City.text=[placemark.addressDictionary objectForKey:@"City"];
              [locationManager stopUpdatingLocation];
          

 ];






#pragma mark - CLLocationManagerDelegate

请添加这两个方法

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

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation

希望这个作品

谢谢

【讨论】：

请确认我定义的坐标类型，如 CLLocationCoordinate2D *coordinate;但没有解决。

我更新了答案，你遇到什么问题告诉我

更正的是 CLLocationCoordinate2D *coordinate 读取为 CLLocationCoordinate2D 坐标。现在它可以工作了，谢谢如尚。

你能帮我实现这个 DTParallaxTableView github.com/toandk/DTTableView 我已经下载了它，但在 ios 8.0 xcode 6.4 中无法使用，显示 Apple o 链接器错误。

让我们continue this discussion in chat.

【参考方案2】：

您需要添加"NSLocationAlwaysUsageDescription""NSLocationWhenInUseUsageDescription" 键入Info.plist 并显示一条消息。

【讨论】：

使用 NSLocationWhenInUseUsageDescription 显示警报并获得许可后，这将导致错误 -[__NSArrayM 坐标]：无法识别的选择器发送到实例 0x1454b210 2015-12-03 13:57:19.546 alootamatar[925:251385 ] *** 由于未捕获的异常“NSInvalidArgumentException”而终止应用程序，原因：“-[__NSArrayM 坐标]：无法识别的选择器发送到实例 0x1454b210”

添加异常断点并显示导致错误的行。我认为您将数组存储在变量中。

您实际上是在将一个数组分配给变量。看看你的行 CLLocation *currentLocation = locations;

位置：阵列响应为 (" +/- 75.28m (速度 -1.00 mps / course -1.00) @ 03/12/15 14:42:50 India Standard Time" ) 分配后类似 CLLocation *currentLocation = locations;结果是错误。

【参考方案3】：

在调用startUpdatingLocation之前，你需要先调用函数来请求权限。

locationManager = [[CLLocationManager alloc] init]; 
locationManager.desiredAccuracy = kCLLocationAccuracyBest; 
locationManager.delegate = self;
[locationManager requestWhenInUseAuthorization]; 
[locationManager startUpdatingLocation];

【讨论】：

更新此代码后未收到响应和任何许可警报。

【参考方案4】：

You need to add
"NSLocationAlwaysUsageDescription"
"NSLocationWhenInUseUsageDescription" key in
Info.plist with a message to be displayed.

In .h file
<CLLocationManagerDelegate>

 CLGeocoder *geoCoder;
 CLLocationManager *locationManager;
 CLPlacemark *placeMark;

@property (weak, nonatomic) IBOutlet MKMapView *mapView;

and .m file

in viewDidLoad Method

_mapView.showsUserLocation = YES;
[self geoLocation];

after that we have to call Delegate methods for CLLocationManager
-(void)geoLocation

  geoCoder = [[CLGeocoder alloc] init];
if (locationManager == nil)
  
    locationManager = [[CLLocationManager alloc] init];
    locationManager.desiredAccuracy = kCLLocationAccuracyBest;
    locationManager.delegate = self;
    [locationManager requestAlwaysAuthorization];
  
  [locationManager startUpdatingLocation];

- (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];

-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations 

CLLocation *newLocation = [locations lastObject];
//[self getCountryDet:lattitude1];
[geoCoder reverseGeocodeLocation:newLocation completionHandler:^(NSArray *placemarks, NSError *error) 

    if (error == nil && [placemarks count] > 0)
    
        NSString *userLat,*userLong;
        placeMark = [placemarks lastObject];

        userLat = [NSString stringWithFormat:@"%.8f",newLocation.coordinate.latitude];
        userLong= [NSString stringWithFormat:@"%.8f",newLocation.coordinate.longitude];
        // For user address
        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);

        // For Zooming Level.
        MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(newLocation.coordinate, 800, 800);
        [self.mapView setRegion:[self.mapView regionThatFits:region] animated:YES];

        // add the Pin annotation
        MKPointAnnotation *pin = [[MKPointAnnotation alloc] init];
        pin.coordinate = newLocation.coordinate;
        pin.title = Address;
        pin.subtitle = Area;
        [self.mapView addAnnotation:pin];

     else 
        NSLog(@"%@", error.debugDescription);
    
];
// Turn off the location manager to save power.
[manager stopUpdatingLocation];

【参考方案5】：

  // IN this code use for get current location address 

  // Create Objet :

    1)create object: CLGeocoder *geocoder;


    2) add viewDidLoad method :


      geocoder = [[CLGeocoder alloc] init];


 -(void)locationManager:(CLLocationManager *)manager didUpdateLocations: (NSArray *)locations

CLLocation *newLocation = [位置 lastObject];

NSLog(@"didUpdateToLocation: %@", newLocation);
CLLocation *currentLocation = newLocation;

[locationManager stopUpdatingLocation];

if (currentLocation != nil)

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


NSLog(@"Resolving the Address");
[geocoder reverseGeocodeLocation:currentLocation completionHandler:^(NSArray *placemarks, NSError *error)
 

     NSLog(@"Found placemarks current: %@, error: %@", placemarks, error);
     if (error == nil && [placemarks count] > 0)
     

       //  placemark = [placemarks lastObject];
         placemark = [placemarks objectAtIndex:0];


         NSString *name = [NSString stringWithFormat:@"%@,%@,%@,%@,%@",
                         placemark.subLocality,
                         placemark.locality,
                         placemark.administrativeArea,placemark.postalCode,
                         placemark.country];


         self.addressview.text=name;
     


     else
     
         NSLog(@"%@", error.debugDescription);
     
  ];