Custom URL Handling iOS xamarin - ios

Question

I'm trying to set up my application so that I can add an NSUrl attribute to specified substrings of a textview, and when that NSUrl is touched, it pushes a new view rather than open a new url.
I am ovverriding OpenURL in my AppDelegate.cs class, and sending a notification with the url
public override bool OpenUrl (UIApplication application, NSUrl url, string sourceApplication, NSObject annotation)
{
NSNotificationCenter.DefaultCenter.PostNotification (NSNotification.FromName ("ArtistDetail", url));
return true;
}
Then in my class that contains the the text view, I add the observer in the constructor
NSNotificationCenter.DefaultCenter.AddObserver ("ArtistDetail", delegate{artistDetail(null);});
And have my method
public void artistDetail (NSNotification notification)
{
//push view based on info in notification.object
}
I'm not having any luck. I found this article Can't push view controller after overriding openURL where someone did it in objective C the same way. One problem - I'm putting breakpoints and log notes in my OpenURL override, and they're not getting hit. When you click/tap an NSSUrl, does it by default call OpenUrl? If so, why isn't my override getting hit?

Answer 1

I've been researching how to do this for 6 hours. Of course, 20 minutes after I post the question on SO, I figure out the answer.
I had to implement a UIApplication subclass, override the method there, register it, and launch it as the UIApplication in my Main.cs.
UIApplicationMain.cs
[Register ("UIApplicationMain")]
public class UIApplicationMain : UIApplication
{
public UIApplicationMain ()
{
}
public override bool OpenUrl (NSUrl url)
{
NSNotificationCenter.DefaultCenter.PostNotification (NSNotification.FromName ("ArtistDetail", url));
return true;
}
}
Main.cs
public class Application
{
// This is the main entry point of the application.
static void Main (string[] args)
{
// if you want to use a different Application Delegate class from "AppDelegate"
// you can specify it here.
UIApplication.Main (args, "UIApplicationMain", "AppDelegate");
}
}
View Controller where the hyperlinks are displayed, and should be handled dynamically to push the view controller you want
public override void ViewDidLoad ()
{
base.ViewDidLoad ();
NSNotificationCenter.DefaultCenter.AddObserver ("ArtistDetail", artistDetail);
}
public void artistDetail (NSNotification notification)
{
NSUrl artistName = (NSUrl)notification.Object;
String name = artistName.AbsoluteString;
this.NavigationController.PushViewController (new ArtistDetailViewController (name), true);
}
For anyone trying to solve the problem of "How to put a button within your UITextView"
(like twitter does with #hastags and #users) - this is it! Put the text in an NSAttributedString, apply the link attribute to the text you want to act as a button, and handle accordingly.