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根据类名来实例化对象，比如，要根据一个类名的字符串创建ViewController实例。
let controllerName="SpainAppProto."+xibName // xibName 形如 XXViewController var classType: AnyObject.Type=NSClassFromString(controllerName) var nsobjectype : UIViewController.Type = classType as UIViewController.Type var viewController: UIViewController = nsobjectype(nibName: xibName, bundle: nil)
但是 在根据 UIViewController.self 来实例化的时候就要稍微转化下
var x: String = m.debugDescription // m为 UIViewController.self x = x.stringByReplacingOccurrencesOfString("Optional(", withString: "") x = x.stringByReplacingOccurrencesOfString(")", withString: "") let anyClass: AnyClass = NSClassFromString(x) let viewControllerClass: UIViewController.Type = anyClass as UIViewController.Type let viewController = viewControllerClass()
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原文地址：http://www.cnblogs.com/ziyeSky/p/4198590.html
