Question

I’m trying to make a delete confirmation action sheet like what you see in OmniGraffle, GarageBand, and several other apps. I want an action sheet with no title and one big red delete button.

In reading the documentation for the constructor of UIActionSheet, it says:

title

A string to display in the title area of the action sheet. Pass nil if you do not want to display any text in the title area.

http://developer.apple.com/library/ios/#documentation/uikit/reference/UIActionSheet_Class/Reference/Reference.html

However, if I do this in MonoTouch:

UIActionSheet actionSheet = new UIActionSheet(
    null, 
    null,
    null,
    "Delete"
);

I get a NullArgumentException. Same if I try to workaround by passing in a dummy string and then do actionSheet.Title = null;. Passing in string.Empty works fine, but gives me extra space above the button I do not want.

So:

1. Is there a reason for this behavior, or is it just a MonoTouch bug?
2. Is there a workaround I can use to get the look and feel I want?

This (with a big red delete button) can’t be too hard in MonoTouch!

But I’m stuck with this:

See the extra space at the top? What do I do?

Answer 1

Many thanks for filling the bug report. This has been fixed for future releases of MonoTouch.

Until then you should be able to replace this:

UIActionSheet actionSheet = new UIActionSheet(
    null, 
    null,
    null,
    "Delete"
);

with

 UIActionSheet actionSheet = new UIActionSheet ();
 actionSheet.DestructiveButtonIndex = actionSheet.AddButton ("Delete");

Let me know if this does not cover the use case you had in mind and I’ll try to find another workaround.