xamarin - Unicode URL =无法初始化 'Foundation.NSUrl' : the native 'initWithString:' 类型的实例

Question

我试图在UIWebView中打开一个包含Unicode字符的URL:

var jrURL = new NSURL("http://δπθ.gr");

结果是:

Could not initialize an instance of the type 'Foundation.NSUrl': 
the native 'initWithString:' method returned nil.
It is possible to ignore this condition by setting
MonoTouch.ObjCRuntime.Class.ThrowOnInitFailure to false.

像 https://Google.com这样的人效果很好

Answer 1

IDN域名，例如:

http://δπθ.gr

为了与 NSUrl一起使用，必须进行转换(基于punycode):

http://xn--pxaix.gr

IDN: https://en.wikipedia.org/wiki/Internationalized_domain_name

Punycode: https://en.wikipedia.org/wiki/Punycode

您可以使用 System.Globalization.IdnMapping将您的域名转换为 Punycode并
此命名空间/类在 Xamarin.iOS和 Xamarin.Android中可用。

var idn = new System.Globalization.IdnMapping ();
var dotnetURI = new System.Uri ("http://δπθ.gr);
Console.WriteLine (dotnetURI.ToString());
NSUrl nsURL = new NSUrl (dotnetURI.Scheme, idn.GetAscii (dotnetURI.DnsSafeHost), dotnetURI.PathAndQuery);
Console.WriteLine (nsURL.ToString());
WebView.LoadRequest(new NSUrlRequest(nsURL));

MSDN IdnMapping.GetAscii: https://msdn.microsoft.com/en-us/library/system.globalization.idnmapping.getascii(v=vs.110).aspx

注意:用于处理punycode转换的 System.Uri.IdnHost是.Net 4.6的一部分，目前在Xamarin的 System命名空间中不可用

引用: https://msdn.microsoft.com/en-us/library/system.uri.idnhost(v=vs.110).aspx