Dialogs

Dialogs

Dialogs provides both a presentation controller for displaying a modal dialog and an alert controller that will display a simple modal alert.

Material Design Specifications

• Dialogs

Dialogs Classes

Dialogs Presentation Controller and Transition Controller

Presenting dialogs utilizes two classes: MDCDialogPresentationController and MDCDialogTransitionController. These allow the presentation of view controllers in a material specificed manner. MDCDialogPresentationController is a subclass of UIPresentationController that observes the presented view controller for preferred content size. MDCDialogTransitionController implements UIViewControllerAnimatedTransitioning and UIViewControllerTransitioningDelegate to vend the presentation controller during the transition.

Alert Controller

MDCAlertController provides a simple interface for developers to present a modal dialog according to the Material spec.

Installation

Requirements

• Xcode 7.0 or higher.
• iOS SDK version 8.0 or higher.

Installation with CocoaPods

To add this component to your Xcode project using CocoaPods, add the following to your Podfile:

pod 'MaterialComponents/Dialogs'

Then run the following command:

pod install

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Usage

To display a modal using MaterialDialogs you set two properties on the view controller to be presented. Set modalPresentationStyle to UIModalPresentationCustom and set transitioningDelegate to and instance of MDCDialogTransitionController. Then you present the view controller from the root controller to display it as a modal dialog.

Importing

Before using Dialogs, you'll need to import it:

Swift

import MaterialComponents.MaterialDialogs

Objective-C

#import "MaterialDialogs.h"

Examples

Display a modal dialog

Swift

// The following is called from the presenting view controller and has the
// following variable defined to keep a reference to the transition
// controller.
strong var dialogTransitionController: MDCDialogTransitionController

// To present the dialog myDialogViewController
dialogTransitionController = MDCDialogTransitionController()
myDialogViewController.modalPresentationStyle = .custom
myDialogViewController.transitioningDelegate = dialogTransitionController

present(myDialogViewController, animated: true, completion:...)

Objective-C

// self is the presenting view controller and which has the following property
// defined to keep a reference to the transition controller.
@property(nonatomic) MDCDialogTransitionController *dialogTransitionController;

// To present the dialog myDialogViewController
self.dialogTransitionController = [[MDCDialogTransitionController alloc] init];
myDialogViewController.modalPresentationStyle = UIModalPresentationCustom;
myDialogViewController.transitioningDelegate = self.dialogTransitionController;
[self presentViewController:myDialogViewController animated:YES completion:...];

Present an alert

Swift

// Present a modal alert
let alertController = MDCAlertController(title: titleString, message: messageString)
let action = MDCAlertAction(title:"OK") { (action) in print("OK") }
alertController.addAction(action)

present(alertController, animated:true, completion:...)

Objective-C

// Present a modal alert
MDCAlertController *alertController =
[MDCAlertController alertControllerWithTitle:titleString
                                     message:messageString];

MDCAlertAction *alertAction =
    [MDCAlertAction actionWithTitle:@"OK"
                            handler:^(MDCAlertAction *action) {
       NSLog(@"OK");
    }];

[alertController addAction:alertAction];

[self presentViewController:alertController animated:YES completion:...];