Source : http://gist.tolpp.com/2015/10/swift-uikit-instatiating.html

IBInstantiatable.swift

/// instantiates component from storyboard by given storyboard name and identifier
protocol IBInstantiatable {
    /// Storyboard name that component designed in
    static var storyboardName       : String {get}
    
    ///    component identifier that assigned to component in storyboard
    ///
    ///    `Identity -> Storyboard ID`
    static var identifier : String {get}
}

extension IBInstantiatable where Self : UIViewController {
    /// Instantiates `UIViewControl` from storyboard
    static func instantiate() -> Self? {
        
        return UIStoryboard(name: storyboardName, bundle: nil).instantiateViewControllerWithIdentifier(identifier) as? Self
    }
}

IBInstantiatableUsage.swift

let vc = MyCustomViewController.instantiate()

MyCustomViewController.swift

class MyCustomViewController: UIViewController {
  //UIViewController staff
}

extension MyCustomViewController : IBInstantiatable {
  static var storyboardName : String {get{return "StoryboardName"}}
  static var identifier     : String {get{return "identifier"}}
}