Many system frameworks define view controllers for standard system interfaces. Whenever possible, use the provided view controllers rather than create your own. You are encouraged to use these view controllers in your apps to present a consistent user experience. Whenever you need to perform one of the following tasks, you should use a view controller from the corresponding framework:
- Display or edit contact information. Use the view controllers in the Address Book UI framework.
- Create or edit calendar events. Use the view controllers in the EventKit UI framework.
- Compose an email or SMS message. Use the view controllers in the Message UI framework.
- Open or preview the contents of a file. Use the class in the UIKit framework.
- Take a picture or choose a photo from the user’s photo library. Use the class in the UIKit framework.
- Shoot a video clip. Use the class in the UIKit framework.