更改时CLLocationManager locationServicesEnabled事件

Question

如何监控[CLLocationManager locationServicesEnabled]何时更改？我需要delegate或notification等内容。

Answer 1

使用CLLocationManager的delagte方法

- (void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status

这些是文档中的CLAuthorizationStatus描述：

    > typedef enum {
    >     kCLAuthorizationStatusNotDetermined = 0, // User has not yet made a choice with regards to this application
    >     kCLAuthorizationStatusRestricted,        // 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
    >     kCLAuthorizationStatusDenied,            // User has explicitly denied authorization for this application, or
    >                                              // location services are disabled in Settings
    >     kCLAuthorizationStatusAuthorized         // User has authorized this application to use location services 
} CLAuthorizationStatus;

Answer 2

您可以使用locationManager:didChangeAuthorizationStatus:方法执行此操作：

-(void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status
{
  //Check new status
}

Answer 3

由于iOS在用户更改全局位置服务设置时没有本机回调/通知，因此我们无法直接处理。但你可以参加

[CLLocationManager locationServicesEnabled]

带

-(void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status { //Check new status }

达到预期的效果，如：

-(void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status
{
 if (![ CLLocationManager locationServicesEnabled]) {
  //perform action when location service is disabled
  }
}

虽然确实理解如果权限已被拒绝且位置设置已更改，您将不会收到此回调。