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Your problem is typically solved by using the <a href="http://en.wikipedia.org/wiki/Model-view-controller" rel="nofollow noreferrer">Model-View-Controller</a> pattern. In this case, your "model" will be an object that stores the numbers and also does the computations with those numbers. Your "view" here will be the views in each tab -- the first tab visualizing the computations, the second tab visualizing the numbers. The "controller" here will be your existing <code>UIViewController</code> objects (or subclasses thereof) -- in the first tab, responding to changes in the data model and updating the (say) <code>UILabels</code> accordingly, in the second tab, changing the numbers in the data model when the user, for example, modifies the value on a <code>UISlider</code> or in a <code>UITextView</code>. Create this data model object (which should just be a subclass of <code>NSObject</code>) in your application delegate, add it as a interface member/property in your view controllers, and pass it to both view controllers when the app starts up. Updating the data model is as simple as having the second view controller call methods and/or change properties in the data model related to various values it uses. You complete the implementation of this pattern with the observation part. Here, you can either have your view controllers use <a href="http://developer.apple.com/mac/library/documentation/cocoa/Conceptual/KeyValueObserving/KeyValueObserving.html" rel="nofollow noreferrer">Key-Value Observing</a> (might be simplest) to watch data members in the data model, or you can have the data model emit <a href="http://developer.apple.com/mac/library/documentation/Cocoa/Conceptual/Notifications/Introduction/introNotifications.html" rel="nofollow noreferrer"><code>NSNotifications</code></a> which your view controller would then register to receive (might be harder).
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1. POHow do I display and calculate numbers from a database on iPhone?
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1. USShaggy Frog
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1. POHow do I display and calculate numbers from a database on iPhone?
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A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.