How can I check if NSTextField did change value in C#?

Question

I created a Cocoa application in C# (using Xamarin.Mac) and I want to check if NSTextField did change the value. I couldn't find a lot of tutorials about this in C#, and the methods found for swift or overrides doesn't work for me. I tried this :

 public override void ObjectDidEndEditing(NSObject editor)

and

 public override void DidChangeValue(string forKey)

Answer 1

There are two ways to check if NSTextField did change the value.

• One is using delegate the same as MacOS native method , however there is a liitle difference with navite code .

As follow :

textField.Delegate = new MyNSTextDelegate();

Create a class inherite from NSTextFieldDelegate :

class MyNSTextDelegate : NSTextFieldDelegate 
{
   [Export("controlTextDidChange:")]
   public void Changed(NSNotification notification)
   {
       NSTextField textField = notification.Object as NSTextField;
       Console.WriteLine("Text Changed : " + textField.StringValue);
   }
}

• Another is using Event from C# Method .

As follow:

textField.Changed += TextValue_Changed;

or

textField.Changed += new EventHandler(TextValue_Changed);

The implement of TextValue_Changed :

private void TextValue_Changed(object sender, EventArgs e)
{
    NSNotification notification = sender as NSNotification;
    NSTextField textField = notification.Object as NSTextField;
    Console.WriteLine("Text Changed : " + textField.StringValue);
}