检查用户何时从 iOS 设置应用程序返回

Question

如果用户禁用了设备位置服务，我需要在我的应用程序中找到用户的位置，我会像这样检查。

if([CLLocationManager locationServicesEnabled])
{
    if([locationManager respondsToSelector:@selector(requestWhenInUseAuthorization)])
    {
        [locationManager requestWhenInUseAuthorization];
    }
}
else if(![CLLocationManager locationServicesEnabled])
{
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error" message:@"Location Services are disabled please enable location services to enjoy nearby experience" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"Settings", nil];
    alert.tag = 103;
    [alert show];
}

在我的警报视图中，我将用户引导至这样的位置设置

 else if(alertView.tag == 103)
{
    if(buttonIndex == 1)
    {

        NSURL*url=[NSURL URLWithString:@"prefs:root=LOCATION_SERVICES"];
        [[UIApplication sharedApplication] openURL:url];
    }
}

用户从设置返回后如何再次获取位置

Answer 1

您可以在applicationWillEnterForeground 中管理您的东西，因为当您来自设置app to your app 时会调用此方法。

您可以使用这种方法编写代码，例如，

 if([CLLocationManager locationServicesEnabled])
{
if([locationManager respondsToSelector:@selector(requestWhenInUseAuthorization)])
{
    [locationManager requestWhenInUseAuthorization];
}
}

Answer 2

使用Location Delegate 方法：-

if([CLLocationManager locationServicesEnabled])
{
    if([locationManager respondsToSelector:@selector(requestWhenInUseAuthorization)])
    {
        [locationManager requestWhenInUseAuthorization];
         //Set Location Delegate
        locationManager.delegate = self;

        locationManager.distanceFilter = kCLDistanceFilterNone;
        locationManager.desiredAccuracy = kCLLocationAccuracyBest;
         //Update Location start
        [locationManager startUpdatingLocation];
    }
}
else if(![CLLocationManager locationServicesEnabled])
{
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error" message:@"Location Services are disabled please enable location services to enjoy nearby experience" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"Settings", nil];
    alert.tag = 103;
    [alert show];
}

#pragma mark CLLocationManager Delegate

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {

    //NSLog(@"OldLocation %f %f", oldLocation.coordinate.latitude, oldLocation.coordinate.longitude);
    //NSLog(@"NewLocation %f %f", newLocation.coordinate.latitude, newLocation.coordinate.longitude);

     [locationManager stopUpdatingLocation];
}