Supporting dynamic text and preferred font size

Dynamic Text

// configure labels:

- (void)configureView
{
  self.textSizeLabel.text = [[UIApplication sharedApplication] preferredContentSizeCategory];
  self.headlineLabel.font = [UIFont preferredFontForTextStyle:UIFontTextStyleHeadline];
  self.subheadLabel.font = [UIFont preferredFontForTextStyle:UIFontTextStyleSubheadline];
  self.bodyLabel.font = [UIFont preferredFontForTextStyle:UIFontTextStyleBody];
  self.caption1Label.font = [UIFont preferredFontForTextStyle:UIFontTextStyleCaption1];
  self.caption2Label.font = [UIFont preferredFontForTextStyle:UIFontTextStyleCaption2];
  self.footnoteLabel.font = [UIFont preferredFontForTextStyle:UIFontTextStyleFootnote];
}


// listen for the setting change:

- (void)viewDidLoad
{
  [super viewDidLoad];
  [[NSNotificationCenter defaultCenter] addObserver:self
      selector:@selector(didChangePreferredContentSize:)
          name:UIContentSizeCategoryDidChangeNotification
        object:nil];
}


// change things when the settings change:

- (void)didChangePreferredContentSize:(NSNotification *)notification
{
  [self configureView];
}