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A really common task in iOS development is to validate input from a form. In this post I wanted to look at one possible implementation for doing this by extracting the form validation (business logic) from the view controller. It's not a new concept but I wanted to explore how …
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There are mainly two reasons why this occurs. The first being that you have forgotten to include a framework that you are attempting to use, the second being that a class .m file has been unticked as a Target. See below for more information on both these possible causes. Lets …