title: Developing Mobile Substrate tweaks
body: <p>I have a few questions about developing mobile substrate tweaks.<br>
  First of all, how do you make them?</p>
  
  <p>Do you have to use XCode? </p>
  
  <p>What kind of files are needed and where do you place your code? </p>
  
  <p>How do you hook into an app? </p>
  
  <p>For example if I want to change something in the Messages app, how could I program it to hook into Messages.app?</p>
  
  <p>I am pretty familiar with developing regular apps for the app store, and I am very interested in mobile substrate. I would really like to know how to do it and where to start. Thanks!</p>