Loading ViewController from xib file

Swift 3

let myViewController = MyViewController(nibName: "MyViewController", bundle: nil)self.present(myViewController, animated: true, completion: nil)

or push in navigation controller

self.navigationController!.pushViewController(MyViewController(nibName: "MyViewController", bundle: nil), animated: true)

extension UIViewController {    static func loadFromNib() -> Self {        func instantiateFromNib<T: UIViewController>() -> T {            return T.init(nibName: String(describing: T.self), bundle: nil)        }        return instantiateFromNib()    }}

Use it as the following:-

let testVC = TestVC.loadFromNib()

Notice the File's Owner. In your case, the File's Owner must be MyViewController, or its sub-class.

And the following code, if it executes in class Foo.

// If `self` is an instance of `Foo` class.// In this case, `File's Owner` will be a `Foo` instance due to the `self` parameter.let myVC = NSBundle.mainBundle().loadNibNamed("MyViewController", owner: self, options: nil)[0] as? MyViewController

It assigns self as owner. So, the File's Owner is Foo, not MyViewController. Then, for Foo class, those IBOutlet cannot be connected to Foo. So, it throws exception.