NibLoadable.swift

import UIKit

public protocol NibLoadable: class {

    static var nibName: String { get }
    static var nib: UINib { get }

}

extension NibLoadable {

    public static var nibName: String {
        let name = NSStringFromClass(self)
        let start = name.rangeOfString(".", options: .BackwardsSearch)?.endIndex ?? name.startIndex
        return String(name.characters.suffixFrom(start))
    }

    public static var nib: UINib {
        return UINib(nibName: nibName, bundle: NSBundle(forClass: self))
    }

    public static func makeFromNib(@noescape configurator configure: Self throws -> ()) rethrows -> Self {
        for case let view as Self in nib.instantiateWithOwner(nil, options: nil) {
            try configure(view)
            return view
        }
        preconditionFailure("Problem instantiating view from \(self).")
    }

    public static func makeFromNib() -> Self {
        return makeFromNib { _ in }
    }

}