How to detect key press on Xamarin.Mac NSTexField?

问题

I am trying to detect when a user presses enter while editing a single line NSTextField, so as to submit the data they've entered.

There doesn't appear to be any events on NSTextField which would be useful,

回答1:

You can subclass NSTextField and override the keyUp method:

[Register("CustomTextField")]
private class CustomTextField : MonoMac.AppKit.NSTextField
{
    public CustomTextField(IntPtr handle) : base(handle)
    {

    }

    public override void KeyUp (NSEvent theEvent)
    {
        if (theEvent.KeyCode == 36) {
            Console.WriteLine ("You pressed enter!");
        }
    }
}

来源：https://stackoverflow.com/questions/16582967/how-to-detect-key-press-on-xamarin-mac-nstexfield