如何在Swift中检查URL的有效性？

问题描述：

尝试让应用启动默认浏览器到网址，但仅当输入的网址有效时，否则会显示一条消息，说明网址无效。

Trying to make an app launch the default browser to a URL, but only if the URL entered is valid, otherwise it displays a message saying the URL is invalid.

我如何使用Swift检查有效性？

How would I go about checking the validity using Swift?

答

如果您的目标是验证您的应用程序是否可以打开网址这是你能做的。虽然safari可以打开Url，但网站可能不存在或者可能已关闭。

If your goal is to verify if your application can open a url here is what you can do. Although safari can open the Url, the website might not exist or it might be down.

func verifyUrl (urlString: String?) -> Bool {
    //Check for nil 
    if let urlString = urlString { 
        // create NSURL instance
        if let url = NSURL(string: urlString) {
            // check if your application can open the NSURL instance 
            return UIApplication.sharedApplication().canOpenURL(url)
        }
    }
    return false
}

如何在Swift中检查URL的有效性？

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