How to share variables between parent and child screens?
<p>I have 2 screens - A and B.
A is the parent, initializing the child - B.</p>

<p>I would like screen A to pass some data to screen B (contact ID for that matter). Using global variable which will hold the contact ID to be passed seems like a waste, since the only screens that will use this global variables are A and B, and not the entire application.</p>

<p>In Android one can use: 
    myIntent.putExtra("key", "value");</p>

<p>How can I achieve this in iPhone?</p>

<p>Thanks.</p>
