Question

I have a Yes/No dialog from UIAlertView with two buttons. I would like in my method to implement the logic similar to this:

if(messagebox.Show() == DialogResult.OK)

The thing is if I call UIAlertView.Show() the process continues. But I need to wait for the result of user interaction and return true or false depanding on clicking the second button. Is this possible in MonoTouch?

Answer 1

To do this, what you can do is to run the mainloop manually. I have not managed to stop the mainloop directly, so I instead run the mainloop for 0.5 seconds and wait until the user responds.

The following function shows how you could implement a modal query with the above approach:

int WaitForClick ()
{
    int clicked = -1;
    var x = new UIAlertView ("Title", "Message",  null, "Cancel", "OK", "Perhaps");
    x.Show ();
    bool done = false;
    x.Clicked += (sender, buttonArgs) => {
        Console.WriteLine ("User clicked on {0}", buttonArgs.ButtonIndex);
    clicked = buttonArgs.ButtonIndex;
    };    
    while (clicked == -1){
        NSRunLoop.Current.RunUntil (NSDate.FromTimeIntervalSinceNow (0.5));
        Console.WriteLine ("Waiting for another 0.5 seconds");
    }

    Console.WriteLine ("The user clicked {0}", clicked);
    return clicked;
}