iOS - 用GPS坐标检测地点

有没有什么方法可以用GPS坐标检测地点？（尽可能不地图）例如，如果检查的经度和纬度是等于或接近这些：iOS - 用GPS坐标检测地点

44 35′25″n 104 42′55″w 
or 
44.5903 -104.7153

然后警报弹出并显示一条消息！谢谢。

来源

2014-02-26 Mc.Lover

你可以衡量你的 “硬编码” 的位置和当前用户位置之间的距离有以下几点：

CLLocation *hardcoded_location = [[CLLocation alloc] initWithLatitude:latitude1 longitude:longitude1]; 
CLLocation *new_location = newLocation; 

CLLocationDistance distance = [hardcoded_location distanceFromLocation:new_location];

然后，你可以这样做：

if (distance < some_value) 
{ 
    [[[UIAlertView alloc] initWithTitle:@"Title" message:@"Message" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil] show]; 
}

UPDATE：

typedef double CLLocationDistance：

的距离测量（以米为单位）从现有的位置。

来源

2014-02-26 08:59:30 damirstuhec

+1 distanceFromLocation！ – satheeshwaran

好的答案，只是一个问题，如果提到'some_value'作为米我应该刚刚提到1000CM值为1米？或应该计算它？ –

@ Mc.Lover 1m是100cm不是1000，总是以米计算 – AlexWien

此代码将被用于解决您的问题。

CLLocation *currentLocation = newLocation; 

if (currentLocation != nil) 
    NSLog(@"longitude = %.8f\nlatitude = %.8f", currentLocation.coordinate.longitude,currentLocation.coordinate.latitude); 

// stop updating location in order to save battery power 
[locationManager stopUpdatingLocation]; 


// Reverse Geocoding 
NSLog(@"Resolving the Address"); 

// “reverseGeocodeLocation” method to translate the locate data into a human-readable address. 

// The reason for using "completionHandler" ---- 
    // Instead of using delegate to provide feedback, the CLGeocoder uses “block” to deal with the response. By using block, you do not need to write a separate method. Just provide the code inline to execute after the geocoding call completes. 

[geocoder reverseGeocodeLocation:currentLocation completionHandler:^(NSArray *placemarks, NSError *error) 
{ 
    NSLog(@"Found placemarks: %@, error: %@", placemarks, error); 
    if (error == nil && [placemarks count] > 0) 
    { 
     placemark = [placemarks lastObject]; 

     // strAdd -> take bydefault value nil 
     NSString *strAdd = nil; 

     if ([placemark.subThoroughfare length] != 0) 
      strAdd = placemark.subThoroughfare; 

     if ([placemark.thoroughfare length] != 0) 
     { 
      // strAdd -> store value of current location 
      if ([strAdd length] != 0) 
       strAdd = [NSString stringWithFormat:@"%@, %@",strAdd,[placemark thoroughfare]]; 
      else 
      { 
      // strAdd -> store only this value,which is not null 
       strAdd = placemark.thoroughfare; 
      } 
     } 

     if ([placemark.postalCode length] != 0) 
     { 
      if ([strAdd length] != 0) 
       strAdd = [NSString stringWithFormat:@"%@, %@",strAdd,[placemark postalCode]]; 
      else 
       strAdd = placemark.postalCode; 
     } 

     if ([placemark.locality length] != 0) 
     { 
      if ([strAdd length] != 0) 
       strAdd = [NSString stringWithFormat:@"%@, %@",strAdd,[placemark locality]]; 
      else 
       strAdd = placemark.locality; 
     } 

     if ([placemark.administrativeArea length] != 0) 
     { 
      if ([strAdd length] != 0) 
       strAdd = [NSString stringWithFormat:@"%@, %@",strAdd,[placemark administrativeArea]]; 
      else 
       strAdd = placemark.administrativeArea; 
     } 

     if ([placemark.country length] != 0) 
     { 
      if ([strAdd length] != 0) 
       strAdd = [NSString stringWithFormat:@"%@, %@",strAdd,[placemark country]]; 
      else 
       strAdd = placemark.country; 
     }

来源

2014-02-26 08:59:29 Romance

是的，你可以检测到设备何时接近某个特定位置（lat，lng）但你必须提一下接近。你不能用lat long值做简单的普通加法和减法。你必须指定一个半径或窗口。

distanceFromCurrentLocation = [userLocation distanceFromLocation:destinationlocation]/convertToKiloMeter; 

if(distanceFromCurrentLocation < yourHigherBound && distanceFromLocation > yourLowerBound) 
{ 
NSLog(@"yes, this place is inside my circle"); 
//Do the geocoding mentioned by others after this to get place name or country or whatever 
} 
else 
{ 
NSLog(@"Oops!! its too far"); 
}

很好看，https://developer.apple.com/library/ios/documentation/userexperience/conceptual/LocationAwarenessPG/RegionMonitoring/RegionMonitoring.html

来源

2014-02-26 10:07:54 satheeshwaran

使用此方法

@interface YourClass : UIViewController 
{ 
    CLGeocoder *geocoder; 
} 
@end 
-(void)viewDidLoad 
{ 
    geocoder = [[CLGeocoder alloc] init]; 
    CLLocationCoordinate2D location; 
    location.latitude = 44.5903f; 
    location.longitude = -104.7153f; 
    [self startGeocoderWithLocation:location]; 
} 

-(void)startGeocoderWithLocation:(CLLocationCoordinate2D)location 
{ 

    CLLocation *newLocation=[[CLLocation alloc]initWithLatitude:location.latitude longitude:location.longitude]; 

    [geocoder reverseGeocodeLocation:newLocation completionHandler:^(NSArray *placemarks, NSError *error) 
    { 
     if (error == nil && [placemarks count] > 0) 
     { 
      CLPlacemark *placemark = [placemarks lastObject]; 
      NSLog(@"%@",placemark.addressDictionary); 

      // you can use placemark.thoroughfare, placemark.locality, etc 
     } 
     else 
     { 
      //Error in finding location 
     } 
    } ]; 
}

公司希望它可以帮助

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2014-02-26 10:27:08 Maverick

iOS - 用GPS坐标检测地点

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