Composing messages

For the final piece of our application, we need to implement some custom functionality that Apple doesn't provide with their APIs. We need to add a text field with a button that appears to be attached to the bottom of the table view. Most of this will require writing some simple C# code and wiring up events.

Let's begin by adding some new member variables to our MessagesController class, as follows:

UIToolbar toolbar; 
UITextField message; 
UIBarButtonItem send; 

We will place the text field and bar buttons inside the toolbar, as in the following code in ViewDidLoad:

public override void ViewDidLoad() 
{ 
  base.ViewDidLoad(); 
 
  //Text Field 
  message = new UITextField( 
    new CGRect(0, 0, TableView.Frame.Width - 88, 32)) 
  { 
    BorderStyle = UITextBorderStyle.RoundedRect, 
    ReturnKeyType = UIReturnKeyType.Send, 
    ShouldReturn = _ => 
    { 
        Send(); 
        return false...