Revealviewcontroller() Always Returns Nil

revealViewController() always returns nil

The most convenient to be a reason for the revealViewController to be nil
is you didn't connect segues correctly in stroyboard.

See this tutorial it's quite easy to follow.

Update
If in your case you just need to open a login vc if the user is not logged in you may do like this:

in AppDelegate

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {

   var rootVCStoryboardId = userIsLoggedin ? "SWRevealViewController" : "LoginViewController"
   self.window?.rootViewController = UIStoryboard(name: Storyboards.main, bundle: NSBundle.mainBundle()).instantiateViewControllerWithIdentifier(rootVCStoryboardId)

Where SWRevealViewController is the stroyboard id for SWRevealViewController and LoginViewController is the storyboard id for your login view controller(or its navigation controller if exists).

SWRevealViewController push to actual navigation controller

Here's your solution

From Menu to Normal ViewController by using Swrevealviewcontroller "setFrontViewPosition"

In Swift

        let obj = self.storyboard?.instantiateViewControllerWithIdentifier("ViewController") as! ViewController
        let navController = UINavigationController(rootViewController: obj)
        navController.setViewControllers([obj], animated:true)
        self.revealViewController().setFrontViewController(navController, animated: true)
        self.revealViewController().setFrontViewPosition(FrontViewPosition.Left, animated: true)

In Objectctive-c

 -(void)main{
     LoginViewController *tar = [self.storyboard instantiateViewControllerWithIdentifier:@"LoginViewController"];
     UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:tar];
     [navController setViewControllers: @[tar] animated: YES];

    [self.revealViewController setFrontViewController:navController];
    [self.revealViewController setFrontViewPosition: FrontViewPositionLeft animated: YES];
}

CLGeocoder always returns nil for latitude / longitude

It's not nil you return a value from an asynchnous method you should use a completion

func getLocation(address: String,completion:@escaping(CLLocation? -> ())) {
     let geocoder = CLGeocoder()
     geocoder.geocodeAddressString(address) { placemarks, error in
           guard let placemark = placemarks?.first else { return } 
           completion(placemark.location)
     }

}

Call

getLocation(address: address) { loc in 
   // embed all code here 
}

Delegate always nil in tableviewcontroller

You've declared your delegate (TableViewDelegate) as non-optional, but in the didSelect method, you're using optional chaining - self.delegate?.clickedTableViewCell(info: currentItem!)

Declare your delegate as weak optional property - weak var delegate: TableViewDelegate? = nil to avoid retain cycle.

Delete your profilePlaceTableViewController.delegate = self. You're doing the same in your performSegue method.

And change your protocol declaration to:

protocol TableViewDelegate: class { 
    func clickedTableViewCell(info: String) 
}

BannerView Nil when calling function from another class

I used Notifications to finally work this out... Controller 2 sends a notification that a purchase has been made, and Controller 1 observes and waits for this notification, then takes care of hiding the banner in Controller 1.

https://blog.bobthedeveloper.io/pass-data-with-nsnotification-in-swift-3-73743723c84b

Picker result is always nil

Here it is

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {

    if let url = info[UIImagePickerController.InfoKey.mediaURL] as? URL {
         self.url = url
    }

    isShown = false
}

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