Question

当我启动我的应用时，我会检查当前位置授权状态：

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

如果启用了整体位置服务（对于整个设备）而不是仅仅要求用户许可，则会弹出警报。如果他们被禁用（否则如果条件），那么我需要致电startUpdatingLocation，因为当授权状态为[self.locationManager requestWhenInUseAuthorization];时（无任何条件），对kCLAuthorizationStatusDenied的调用无效。好的，所以我打电话给startUpdatingLocation，然后提醒弹出说：

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，授权状态变为kCLAuthorizationStatusNotDetermined，但当我致电requestWhenInUseAuthorization时，它无效！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关于CLLocationManager的文档关于- (void)requestWhenInUseAuthorization

如果当前授权状态不是 kCLAuthorizationStatusNotDetermined，这个方法什么都不做不要调用locationManager：didChangeAuthorizationStatus：method

以下是您的需求：

- (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];
    }
}

Courtesy copy of this blog post

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

1 个答案: