Load ViewController from Storyboard or View from Xib (These are same name.) Require : Swift 2.0

UIView+NibInstantiatable.swift

protocol NibInstantiatable {
    static var NibName: String { get }
}

extension NibInstantiatable {

    static var NibName: String { return String(Self) }

    static func instantiate() -> Self {
        return instantiateWithName(NibName)
    }

    static func instantiateWithOwner(owner: AnyObject?) -> Self {
        return instantiateWithName(NibName, owner: owner)
    }

    static func instantiateWithName(name: String, owner: AnyObject? = nil) -> Self {
        let nib = UINib(nibName: name, bundle: nil)
        guard let view = nib.instantiateWithOwner(owner, options: nil).first as? Self else {
            fatalError("failed to load \(name) nib file")
        }
        return view
    }
}

UIViewController+StoryboardInstantiatable.swift

protocol StoryboardInstantiatable {
    static var StoryboardName: String { get }
}

extension StoryboardInstantiatable {
    
    static var StoryboardName: String { return String(Self) }
    
    static func instantiate() -> Self {
        return instantiateWithName(StoryboardName)
    }

    static func instantiateWithName(name: String) -> Self {
        let storyboard = UIStoryboard(name: name, bundle: nil)
        guard let vc = storyboard.instantiateInitialViewController() as? Self else{
            fatalError("failed to load \(name) storyboard file.")
        }
        return vc
    }
}

xx_sample.swift

// UIViewController
// case: same name (FooVC.swift / FooVC.storyboard)

class FooVC: UIViewController,StoryboardInstantiatable  {
}

let fooVC = FooVC.instantiate()

// UIViewController
// case: different name (BarVC.swift / Sample.storyboard)

class BarVC: UIViewController,StoryboardInstantiatable  {
    static var StoryboardName = "Sample"
}

let barVC = BarVC.instantiate()

// UIView
// case: same name (FooView.swift / FooView.xib)

class FooView: UIView, NibInstantiatable  {
}
let fooView = FooView.instantiate()

// UIView
// case: different name (BarView.swift / Sample.xib)

class BarView: UIView, NibInstantiatable  {
    static var NibName = "Sample"
}
let barView = BarView.instantiate()