Design patterns are to impose both a programmer's operating scheme, during the preparation of the application code, as well as to facilitate him. In this post, I will present my simplified version of the standard implementation of the Factory - Factory for example, the Objective-C.

If you create more complex applications, Apple's mobile platform, especially when used in a class of space CoreData, there is a problem "freez" applications. When executing multiple queries in a short time in the main application thread, there is a situation in which the view is not refreshed. In other words, if the programmer wants to update a progress bar for example, has to perform more complex operations in an additional thread to offload the main thread and be able to view update.

Recently quite a loud buzz about the new platform for XNA - Windows Phone 7 Microsoft has already released the relevant tools to emulate both the same hardware platform for the PC as well as create on her application.