在Swift中声明符合协议的类

在objective-C中，我们可以将符合某些协议的类声明为

@property (nonatomic, strong) Class<UIObjectRestoration> objectRestorationClass;

问题是: 我怎样才能用斯威夫特？我试着用

var objectRestorationClass: UIObjectRestoration!

及

但这给了我一个错误

“SomeClass.Type”未转换为协议“UIObjectRestoration”

有些课程是：

class SomeClass: UIViewController, UIObjectRestoration {

 class func objectWithRestorationIdentifierPath(identifierComponents: [AnyObject]!, coder: NSCoder!) -> UIStateRestoring! {

        return restoringObject
    }

}

---

我尝试键入它，但它给了我相同的错误。

[UIObjectRestoration]

是UIObjectRestoration项的数组。使用

var-objectRestorationClass:UIObjectRestoration

并使用

objectRestorationClass=SomeClass.classForCoder赋值，您可以使用

var objectRestorationClass: UIObjectRestoration.Type!

“AnyClass”与“UIObjectRestoration”不完全相同在Objective-C中使用
Class
与仅使用
Class
之间是否有明显区别？
class SomeClass: UIViewController, UIObjectRestoration {

 class func objectWithRestorationIdentifierPath(identifierComponents: [AnyObject]!, coder: NSCoder!) -> UIStateRestoring! {

        return restoringObject
    }

}

var objectRestorationClass: UIObjectRestoration.Type!