material-components_material-components-ios/components/FeatureHighlight/docs/typical-use-highlight-a-view.md

Typical use: highlight a view

Swift

let completion = {(accepted: Bool) in
  // perform analytics here
  // and record whether the highlight was accepted
}

let highlightController = MDCFeatureHighlightViewController(highlightedView: viewToHighlight,
                                                            completion: completion)
highlightController.titleText = "Just how you want it"
highlightController.bodyText = "Tap the menu button to switch accounts, change settings & more."
highlightController.outerHighlightColor =
  UIColor.blue.withAlphaComponent(kMDCFeatureHighlightOuterHighlightAlpha)
present(highlightController, animated: true, completion:nil)

Objective-C

MDCFeatureHighlightCompletion completion = ^(BOOL accepted) {
  // perform analytics here
  // and record whether the highlight was accepted
};

MDCFeatureHighlightViewController *highlightController =
[[MDCFeatureHighlightViewController alloc] initWithHighlightedView:viewToHighlight
                                                        completion:completion];
highlightController.titleText = @"Just how you want it";
highlightController.bodyText = @"Tap the menu button to switch accounts, change settings & more.";
highlightController.outerHighlightColor =
    [[UIColor blueColor] colorWithAlphaComponent:kMDCFeatureHighlightOuterHighlightAlpha];
[self presentViewController:highlightController animated:YES completion:nil];

Often when highlighting a view you will want to display a different view to the one you are highlighting. For example, flipping the primary and secondary colors in the presented version.

Swift

let displayedButton = UIButton(type: .system)
displayedButton.setTitle(highlightedButton.title(for: .normal), for: .normal)
displayedButton.setTitleColor(highlightedButton.backgroundColor, for: .normal)
displayedButton.backgroundColor = highlightedButton.titleColor(for: .normal)

let highlightController = MDCFeatureHighlightViewController(highlightedView: highlightedButton, andShow: displayedButton, completion: completion)

Objective-C

UIButton *displayedButton = [UIButton buttonWithType:UIButtonTypeSystem];
[displayedButton setTitle:[highlightedButton titleForState:UIControlStateNormal]
                 forState:UIControlStateNormal];
[displayedButton setTitleColor:highlightedButton.backgroundColor forState:UIControlStateNormal];
displayedButton.backgroundColor = [highlightedButton titleColorForState:UIControlStateNormal];
MDCFeatureHighlightViewController *highlightController =
[[MDCFeatureHighlightViewController alloc] initWithHighlightedView:highlightedButton
                                                       andShowView:displayedButton
                                                        completion:completion];