请问怎么把 NSNotification.object: AnyObject? 转为 NSURL

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问题源于JadenGeller/Helium 一个极简的可以让你在浏览网页的同时做其他事（比如预览正在开发的网页）的浮动浏览器

现有的打开网页很麻烦，想为其加入url scheme打开的功能。

因为打算用NSNotification以配合之前的代码

NSNotificationCenter.defaultCenter().postNotificationName("HeliumLoadURL", object: urlObject)

而在view 注册，直接将object 设为NSURL.self的时候获取不到

override func viewDidLoad() {
//...
NSNotificationCenter.defaultCenter().addObserver(self, selector: "loadURLObject:", name: "HeliumLoadURL", object: nil)
//...
}
func loadURLObject(urlObject:NSNotification) {
        let url:NSURL = (urlObject.object as! NSURL)  //怎么转？
        println("opening:\(url)")
        webView.loadRequest(NSURLRequest(URL: url))
}