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copied!<ul> <li><p>If you use <code>settings bundle to manage preferences from the Settings app</code>:</p> <p>From what you said in your question, you already know how to get a notification(<code>UIApplicationDidBecomeActiveNotification</code>) when your app becomes active, right?</p> <p>If so, the only problem left is how to reload your view after you receive the notification. Other than <code>UITableView</code>, which can be easily reloaded by calling <code>[tableView reloadData]</code>, you have to reload your view by assigning values to the UI controls that you want to reload just as you set them up initially. Say you have a <code>UILabel</code> label you want to reload with the newly set preference value, you just write code like this:</p> <pre><code>- (void)reloadView { label.text = [[NSUserDefaults standardUserDefaults] stringForKey:@"PreferenceKey"]; self.view.background = … [self.tableView reloadData]; } - (void)reloadViewOnAppActivation:(NSNotification *)notif { [self reloadView]; } </code></pre></li> <li><p>If you are using <code>in app preferences setting</code>:</p> <ol> <li><p>If the preferences view controller does not display simultaneously with the SplitViewController. Reload your views in their controllers' <code>viewWillAppear:</code> methods:</p> <pre><code>- (void)viewWillAppear:(BOOL)animated { [super viewWillAppear:animated]; [self reloadView]; // See the definition of reloadView above } </code></pre></li> <li><p>Otherwise, make the SplitViewController the delegate of, or assign it to an ivar of, the preferences view controller, and notify it of the preferences changes when appropriate — immediately after changing any single preference if you prefer in realtime update, or after all the changes are done if you prefer batch update:</p> <pre><code>// SplitViewController methods: - (void)preferencesAreChanged { [self reloadView]; // See the definition of reloadView above } // Preferences view controller methods: // Immediate update, use a preference controlled by a `UISegmentedControl` as an example - (void)viewDidLoad { [super viewDidLoad]; … [segmentedControl addTarget:self action:@selector(xPreferenceTogglingAction:) forControlEvents:UIControlEventValueChanged]; … } - (IBAction)xPreferenceTogglingAction:(id)sender { // Update the x preference. … [delegate preferencesAreChanged]; } // Batch update - (void)viewWillDisappear:(BOOL)animated { [delegate preferencesAreChanged]; [super viewWillDisappear:animated]; } </code></pre></li> </ol></li> </ul>

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