SWIFT：为什么我无法在UIWebView中加载当前的URL？

I need to get the current URL loaded into the webview and this is how I'm trying to get that but it gives me this error: "Cannot convert the exporessions type 'ST7??' to type 'String'

我需要将当前的URL加载到webview中，这就是我试图得到它的方法，但它给了我这个错误：“无法转换exporessions类型'ST7 ??'输入'String'

and this is the code

这是代码

 var currentURL : NSString = webView.request?.URL.absoluteString!

What is wrong with this?

这有什么问题？

2 个解决方案

#1

If you put parentheses around this, the error goes away:

如果你在括号周围加上括号，那么错误就会消失：

let currentURL : NSString = (webView.request?.URL.absoluteString)!

#2

Beware that yours might not be just a syntax problem. If your webView is in a state where request == nil your app will crash at runtime.

请注意，您的可能不仅仅是语法问题。如果您的webView处于request == nil状态，您的应用程序将在运行时崩溃。

I'd rather write something like:

我宁愿写下这样的东西：

if let currentURL = webView.request?.URL.absoluteString {

    // do things ...
    // Your currentURL will be automatically bridged to Swift's String type 

} else {

   // Just in case request is nil ...

}

#1