Swift - 在扩展中获取类名？

Question

我试图从扩展中的类方法中获取类名。这可能吗？我最终以“DRHT”作为类(class)名称

扩展

extension UIViewController {

    public class func instanceFromStoryboard(storyboardIdentifier: String = "Main") -> UIViewController {
        let storyboard = UIStoryboard(name: storyboardIdentifier, bundle: nil)
        let controllerIdentifier = NSStringFromClass(self)
        return storyboard.instantiateViewControllerWithIdentifier(controllerIdentifier) as UIViewController
    }

}

用法

let homeViewController = HomeViewController.instanceFromStoryboard()

Answer 1

我最终采用了不同的方式来使其更加类型安全并消除强制转换。

extension UIStoryboard {

    public class func instantiateViewController <T: UIViewController>(type: T.Type, storyboardIdentifier: String = "Main") -> T {
        let storyboard = UIStoryboard(name: storyboardIdentifier, bundle: nil)
        return storyboard.instantiateViewController(type)
    }

    public func instantiateViewController <T: UIViewController>(type: T.Type) -> T {
        return instantiateViewControllerWithIdentifier(String(type)) as! T
    }

}

extension UIViewController {

    public class func instantiateFromStoryboard(storyboardName: String = "Main") -> Self {
        return UIStoryboard.instantiateViewController(self, storyboardIdentifier: storyboardName)
    }
}

用法

let vc = UIStoryboard.instantiateViewController(HomeViewController.self)

或

let vc = UIStoryboard.instantiateViewController(HomeViewController.self, storyboardIdentifier: "Storybaord_Name")

或

let vc = storyboard.instantiateViewController(HomeViewController.self)

或

let vc = HomeViewController.instantiateViewController()