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    <p>If I followed your code properly, you do not need to adopt the mentioned protocol in your <code>ChooseServerViewController</code>, only <code>PreferencesViewController</code>.</p> <p>The reasoning is you want to send data <strong>back</strong> to the previous view controller. Try:</p> <pre><code>@protocol defaultLocationChoice &lt;NSObject&gt; - (void) locChoice:(NSString*)choice; @end </code></pre> <p>Have your <code>PreferencesViewController</code> implement that method so it <strong>receives</strong> the selection. You will have to store that in an appropriate instance variable.</p> <pre><code>// in PreferencesViewController.m -(void)locChoice:(NSString*)choice { self.choice = choice; // this just my example } </code></pre> <p>When the choice is made (in <code>ChooseServerViewController</code>) to send the choice back, call:</p> <pre><code>// this is in 'ChooseServerViewController.m' some where appropriate [self.delegate locChoice:cellValue]; </code></pre> <p>Your implementation is simply doing nothing with cell value (not even storing it, just logging it). When you return to <code>PreferencesViewController</code>, you will now have the selected value and that view controller can what it wants with it.</p> <p>Protocols are somewhat analgous to interfaces in Java or C#, but more flexible.</p> <ul> <li><a href="http://developer.apple.com/library/ios/#documentation/General/Conceptual/CocoaEncyclopedia/DelegatesandDataSources/DelegatesandDataSources.html" rel="nofollow">Some more concepts about delegation</a>.</li> <li><a href="http://developer.apple.com/library/ios/#documentation/cocoa/conceptual/ProgrammingWithObjectiveC/WorkingwithProtocols/WorkingwithProtocols.html" rel="nofollow">Working with Protocols</a>.</li> </ul> <p><strong>UPDATE</strong>:</p> <p>The declaration for <code>ChooseServerViewController</code> should look like:</p> <pre><code>#import "FileWithProtocolDecalration.h" @interface ChooseServerViewController . . . @property ( nonatomic,assign) id&lt;defaultLocationChoice&gt; delegate; . . . @end </code></pre>
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    1. COMy ChooseServerViewController complains that I'm not implementing a required protocol?
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      1. USDan James Palmer
    2. CO@DanJamesPalmer That view controller does not need to implement it, so in the .h remove the section `<defaultLocationChoice>`. I'll update my answer.
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      1. USMike D
    3. COI did try that but it then complained about my PrepareForSegue code as it couldn't find the locationDelegate in ChooseServerViewController and the self.delegate threw up and error that it couldn't find "delegate"
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