定义在Swift中被视为类的结构

在 Swift中,String结构也被视为类对象,就像使用NSCoder encodeObject(_：forKey :)方法一样.我知道String直接与objective-c类NSString桥接,但有没有办法制作一个行为相似的自定义结构？也许将它连接到一个自定义类？我希望能够做到这样的事情：

struct SortedArray <Value: Comparable> {}

// Would I need to create a bridge between 
// SortedArray and NSSortedArray? Can I even do that?
class NSSortedArray <Value: Comparable> : NSObject,NSCoding {
    required init?(coder aDecoder: NSCoder) {}
    func encodeWithCoder(aCoder: NSCoder) {}
}

class MyClass : NSObject,NSCoding {
    private var objects: SortedArray<String> = SortedArray<String>()
    required init?(coder aDecoder: NSCoder) {
        guard let objects = aDecoder.decodeObjectForKey("objects") as? SortedArray<String> else { return nil }
        self.objects = objects
    }
    func encodeWithCoder(aCoder: NSCoder) {
        aCoder.encodeObject(objects,forKey: "objects")
    }
}