当用户在 iOS 中不允许 AuthorizedAlways 时，是否可以回退到 AuthorizedWhenInUse？

Question

我的应用在后台使用用户位置，但有时，用户不允许应用始终收集 GPS 数据。该应用只能处理前台位置，我想将其设置为后备。

有没有一种优雅的方式，一旦 iOS 用户拒绝了我的 AuthorizedAlways 请求，重新提示用户授予 AuthorizedWhenInUse 权限？

Answer 1

你不能强迫它，但你可以：

1) 知道用户被拒绝权限 2) 并显示警告：“请转到设置并启用它”。
3) 进入ios设置([[UIApplication sharedApplication] openURL:[NSURL URLWithString: UIApplicationOpenSettingsURLString]];)

类似这样的：

- (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];
}