Today I updated my mac with the latest version of MonoDevelop, MonoTouch and the Mono-Framework. I also downloaded the latest version of XCode, version 4 (a nifty 4.5 gig do
From Miguel's MT 4.0 Announcement
We are currently hard at work to add support to MonoDevelop to work with the new XCode 4.
With XCode 4, Apple removed Interface Builder as a standalone tool. We should have a beta in a couple of weeks of the solution we came up with.
you can install them side by side by doing so(I believe you have Xcode 4 installed): Run the Xcode 3 installer When you can choose the install location change it to the folder of your choice but not to developer Complete the installation and open Xcode 3 done
use mono for mac os.
then convert your application on monomac solution and build and run application, after build u get .app file,
for this you need C# plugin on mono.
or cocoa sharp plugin.