是否有可能退回到AuthorizedWhenInUse當用戶不允許的iOS AuthorizedAlways？

Question

我的應用程序使用用戶位置的背景下，但有時，用戶不允許應用程序始終收集的GPS數據。該應用只能處理前景，我想將其設置爲後備。

有沒有一種優雅的方式，一旦iOS的用戶已經拒絕我的要求AuthorizedAlways，再提示用戶給AuthorizedWhenInUse許可？

Answer 1

你不能強迫它，但你可以：

1）知道用戶被拒絕權限 2），並顯示一條警告，要求：「請去設置和啓用它。」
3）進入iOS設置（[[UIApplication sharedApplication] openURL:[NSURL URLWithString: UIApplicationOpenSettingsURLString]];）

事情是這樣的：

- (void)checkLocation 
{ 
    CLAuthorizationStatus status = [CLLocationManager authorizationStatus]; 

    if (status == kCLAuthorizationStatusAuthorizedAlways){ 
     NSLog(@"ok"); 
    } else if(status == kCLAuthorizationStatusDenied || 
       status == kCLAuthorizationStatusAuthorizedWhenInUse){ 
     [self showRequestLocationMessage]; 
    } else if(status == kCLAuthorizationStatusNotDetermined){ 
     //request auth 
    } 

} 

- (void)showRequestLocationMessage 
{ 
    UIAlertAction *action = [UIAlertAction actionWithTitle:@"Settings" 
                style:UIAlertActionStyleDefault 
                handler:^(UIAlertAction * alertAction){ 
                 [[UIApplication sharedApplication] openURL:[NSURL URLWithString: UIApplicationOpenSettingsURLString]]; 
                }]; 

    NSString *title = @"Service Enable"; 
    NSString *text = @"Please enable your location.. bla bla bla"; 

    UIAlertController *alertController = [UIAlertController 
              alertControllerWithTitle:title 
              message:text 
              preferredStyle:UIAlertControllerStyleAlert]; 

    UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"Cancel" 
                  style:UIAlertActionStyleDefault 
                 handler:^(UIAlertAction * action){ 
                  [alertController dismissViewControllerAnimated:YES completion:nil]; 
                 }]; 

    [alertController addAction:cancelAction]; 
    [alertController addAction:action]; 

    [self presentViewController:alertController animated:YES completion:nil]; 
}