[MonoTouch] Showing buttons with a different background (tip)

[competent_tech]

Our application contains numerous data entry forms and, depending on the
user's capabilities, the state of the data entry form, or the required
status of a field, we must change the background color of the control to
improve the user experience. Users don't appreciate it if a button looks
like it can be pressed, but nothing happens when they do.

If you have tried to change the background color for UIButtons without
modifying the default properties, you will have discovered that the
background color doesn't really change. Something happens in the corners,
but that doesn't really help.

The solution is to change the Button Type from the default Rounded Rect to
Custom. 

Unfortunately, that change yields a square box that doesn't appear much like
a button. The solution to this problem is to add code that adjusts the
corners at runtime:

  theControl.Layer.CornerRadius = 5;
  theControl.Layer.BorderWidth = 1;
  theControl.Layer.BorderColor = UIColor.Gray.CGColor;

Because we want a consistent look on all of our data entry controls (we use
buttons to popup date and picklist views rather than having the user enter
the data directly), we have a common method that accepts a UIView parameter
(theControl) and then apply the above code to view. This works well for
UIButton, UITextField, and UITextView controls.



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