UIView extension to simplify load and reuse views

UIView+LoadAndReuse.swift

// https://gist.github.com/Koshub/6fb12b8d2430e586b4c8
// Created by Konstantin Gerasimov on 11/25/15.

import UIKit

extension UIView {
    
    class func loadFromNib<T: UIView>(view: T.Type) -> T? {
        if let nib = NSBundle.mainBundle().loadNibNamed(className(), owner: nil, options: nil) {
            for object in nib {
                if let object = object as? T {
                    return object
                }
            }
        }
        return nil
    }
}

extension NSObject {
    
    class func className() -> String {
        let objectClass: AnyClass = self
        let objectClassName = NSStringFromClass(objectClass)
        let objectClassNameComponents = objectClassName.componentsSeparatedByString(".")
        return objectClassNameComponents.last!
    }
}

extension UIStoryboard {
    
    func createViewController<T: UIViewController>(vc: T.Type) -> T {
        return instantiateViewControllerWithIdentifier(vc.storyboardId()) as! T
    }
}

extension UIViewController {
    class func storyboardId() -> String {
        return className()
    }
}

extension UITableViewCell {
    class func cellId() -> String {
        return className()
    }
}

extension UITableView {
    
    func registerNibOfCell<T: UITableViewCell>(cell: T.Type) {
        let nib = UINib(nibName: cell.className(), bundle: nil)
        registerNib(nib, forCellReuseIdentifier: cell.cellId())
    }
    
    func registerCell<T: UITableViewCell>(cell: T.Type) {
        registerClass(cell, forCellReuseIdentifier: cell.cellId())
    }
    
    func dequeueReusableCell<T: UITableViewCell>(cell: T.Type = T.self) -> T {
        let cell = dequeueReusableCellWithIdentifier(cell.cellId()) as? T
        return cell!
    }
    
    func dequeueForIndexPath<T: UITableViewCell>(indexPath: NSIndexPath, reusableCell cell: T.Type = T.self) -> T {
        let cell = dequeueReusableCellWithIdentifier(cell.cellId(), forIndexPath: indexPath) as? T
        return cell!
    }
}

extension UICollectionReusableView {
    
    class func viewId() -> String {
        return className()
    }
}