如果先前已禁用位置服务，则CLLocationManager不会显示弹出窗口

Question

当我启动我的应用程序时，我检查当前位置授权状态如下：

- (void)checkCurrentStatus
{
if ([CLLocationManager authorizationStatus] == kCLAuthorizationStatusNotDetermined)
{
   [self.locationManager requestWhenInUseAuthorization];
}
else
if ([CLLocationManager authorizationStatus] == kCLAuthorizationStatusDenied && ![CLLocationManager locationServicesEnabled])
{
    [self.locationManager startUpdatingLocation];
}
}

如果启用整体位置服务（对于整个设备）而不是仅仅要求用户许可，则会弹出警报。 如果它们被禁用（否则如果条件）那么我需要调用startUpdatingLocation因为调用[self.locationManager requestWhenInUseAuthorization]; 授权状态为kCLAuthorizationStatusDenied （没有任何if条件）时kCLAuthorizationStatusDenied 。 好的，所以我调用startUpdatingLocation ，然后弹出警告说：

启用位置服务以允许“AppName”确定您的位置

好的，我转到整体位置服务的设置。 在此之后，authorizationStatus变为kCLAuthorizationStatusNotDetermined但是当我调用requestWhenInUseAuthorization它没有任何效果！ 没有弹出窗口，用户没有提示授权位置，状态保持不变，我无法使用位置管理器。 我该怎么处理？

Answer 1

来自Apple的CLLocationManager上的文档- (void)requestWhenInUseAuthorization

如果当前授权状态不是kCLAuthorizationStatusNotDetermined，则此方法不执行任何操作并且不调用locationManager：didChangeAuthorizationStatus：方法

这就是你需要的：

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

    // If the status is denied or only granted for when in use, display an alert
    if (status == kCLAuthorizationStatusAuthorizedWhenInUse || status == kCLAuthorizationStatusDenied) {
        NSString *title;
        title = (status == kCLAuthorizationStatusDenied) ? @"Location services are off" : @"Background location is not enabled";
        NSString *message = @"To use background location you must turn on 'Always' in the Location Services Settings";

        UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:title
                                                            message:message
                                                           delegate:self
                                                  cancelButtonTitle:@"Cancel"
                                                  otherButtonTitles:@"Settings", nil];
        [alertView show];
    }
    // The user has not enabled any location services. Request background authorization.
    else if (status == kCLAuthorizationStatusNotDetermined) {
        [self.locationManager requestAlwaysAuthorization];
    }
}

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
    if (buttonIndex == 1) {
        // Send the user to the Settings for this app
        NSURL *settingsURL = [NSURL URLWithString:UIApplicationOpenSettingsURLString];
        [[UIApplication sharedApplication] openURL:settingsURL];
    }
}

这篇博文的礼貌副本