Initialize a view controller with its view defined in storyboard

creating view controller from storyboard

iOS development builds around storyboard.

my opinionated approach is to keep only 1 view controller in each storyboard.

use it only as the view of controller, but do most of the control in code.

you may wonder why not just using XIB?

first it requires you overriding loadView(), which is some overhead

second prototype cell is supported only in storyboard

it's just a lot easier to put it altogether

also you may use storyboard reference to do embeded view controller, which is 

somewhat tedious to do in code

sbHelper.swift

// example 
// let vc = sb() as MainVC


extension UIViewController {
    static var name: String {
        return String(describing: self)
    }
}

infix operator !?

public func !? <T>(wrapped: T?, nilDefault: @autoclosure () -> (value: T, text: String)) -> T {
    assert(wrapped != nil, nilDefault().text)
    return wrapped ?? nilDefault().value
}

func sb<T>() -> T where T: UIViewController {
    return UIStoryboard(name: T.name, bundle: Bundle.main).instantiateInitialViewController() as? T !? (T(), "\(T.name) not instantiated")
}