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    <p>I used a similar technique to update a button in a UIToolbar when a UIWebView is reloading (as it doesn't appear to be possible to show/hide individual bar button items). In this case, you need to swap out all of the items in the UIToolbar.</p> <pre><code>@property (strong, nonatomic) IBOutlet UIBarButtonItem *refreshBarButton; @property (nonatomic, strong) UIActivityIndicatorView *activityView; @property (nonatomic, strong) UIBarButtonItem *activityBarButton; @property (strong, nonatomic) IBOutlet UIToolbar *toolbar; @property (strong, nonatomic) IBOutlet UIBarButtonItem *backBarButton; @property (strong, nonatomic) IBOutlet UIBarButtonItem *refreshBarButton; @property (strong, nonatomic) IBOutlet UIBarButtonItem *forwardBarButton; </code></pre> <hr> <pre><code>#pragma mark - UIWebViewDelegate -(void)webViewDidFinishLoad:(UIWebView *)webView{ [self updateButtons]; } -(void)webViewDidStartLoad:(UIWebView *)webView{ [self updateButtons]; } -(void)updateButtons{ /* It's not possible to show/hide bar button items so we need to do swap out the toolbar items in order to show the progress view */ //Initialise the activity view if (self.activityBarButton == nil){ self.activityView = [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(0, 0, 20, 20)]; self.activityBarButton = [[UIBarButtonItem alloc] initWithCustomView:self.activityView]; self.activityBarButton.enabled = NO; } NSMutableArray *toolbarItems = [[NSMutableArray alloc] initWithArray:self.toolbar.items]; if ([self.webview isLoading]){ //Replace refresh button with loading spinner [toolbarItems replaceObjectAtIndex:[toolbarItems indexOfObject:self.refreshBarButton] withObject:self.activityBarButton]; //Animate the loading spinner [self.activityView startAnimating]; } else{ //Replace loading spinner with refresh button [toolbarItems replaceObjectAtIndex:[toolbarItems indexOfObject:self.activityBarButton] withObject:self.refreshBarButton]; [self.activityView stopAnimating]; } //Set the toolbar items [self.toolbar setItems:toolbarItems]; //Update other buttons self.backBarButton.enabled = [self.webview canGoBack]; self.forwardBarButton.enabled = [self.webview canGoForward]; } </code></pre>
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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.

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