iOS 설정에서 GPS 설정 확인

[CLLocationManager locationServicesEnabled] == YES

앱에서 GPS 설정 확인

[CLLocationManager authorizationStatus] == kCLAuthorizationStatusDenied

이렇게 하면 편리함 ㅋㄷ

/*
//결정 전
kCLAuthorizationStatusNotDetermined = 0,
//제한 사용
kCLAuthorizationStatusRestricted,
//이용 거부
kCLAuthorizationStatusDenied,
//항상 이용 (백그라운드에서도; ex.지오펜스)
kCLAuthorizationStatusAuthorizedAlways NS_ENUM_AVAILABLE(NA, 8_0),
//앱이 사용중일때만 (포그라운드일때만)
kCLAuthorizationStatusAuthorizedWhenInUse NS_ENUM_AVAILABLE(NA, 8_0),
*/

// 사용 예
if([CLLocationManager locationServicesEnabled] == YES &&
  [CLLocationManager authorizationStatus] != kCLAuthorizationStatusDenied) 
{
    // show the map
} else {
    // show error
}

[원문]

// User has not yet made a choice with regards to this application

kCLAuthorizationStatusNotDetermined = 0,

// This application is not authorized to use location services.  Due

// to active restrictions on location services, the user cannot change

// this status, and may not have personally denied authorization

kCLAuthorizationStatusRestricted,

// User has explicitly denied authorization for this application, or

// location services are disabled in Settings.

kCLAuthorizationStatusDenied,

// User has granted authorization to use their location at any time,

// including monitoring for regions, visits, or significant location changes.

kCLAuthorizationStatusAuthorizedAlways NS_ENUM_AVAILABLE(NA, 8_0),

// User has granted authorization to use their location only when your app

// is visible to them (it will be made visible to them if you continue to

// receive location updates while in the background).  Authorization to use

// launch APIs has not been granted.

kCLAuthorizationStatusAuthorizedWhenInUse NS_ENUM_AVAILABLE(NA, 8_0),