【Swift】通过类名创建对象

import Foundation
import UIKit

extension NSObject {

func swiftClassFromString(className: String) -> UIViewController! {
// get the project name
if  let appName: String = NSBundle.mainBundle().objectForInfoDictionaryKey("CFBundleName") as! String? {
//拼接控制器名
let classStringName = "\(appName).\(className)"
//将控制名转换为类
let classType = NSClassFromString(classStringName) as? UIViewController.Type
if let type = classType {
let newVC = type.init()
return newVC
}
}
return nil;
}
}

//将控制器名转换为类
let vc = self.swiftClassFromString(className)
self.navigationController！.pushViewController(vc, animated: true)