November 2015
Intermediate to advanced
800 pages
29h 24m
English
Content preview from Programming iOS 9Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 20. Mail and Messages
Your app can present an interface allowing the user to edit and send a mail message or an SMS message. Two view controller classes are provided by the Message UI framework; you’ll need to import MessageUI. In addition, the Social framework lets you post to Twitter or Facebook on the user’s behalf. You’ll need to import Social. The classes are:
- MFMailComposeViewController
- Allows composition and sending of a mail message.
- MFMessageComposeViewController
- Allows composition and sending of an SMS message.
- SLComposeViewController
- Allows composition and sending of a Twitter or Facebook post. Alternatively, you can prepare and post a message directly using SLRequest.
UIActivityViewController (Chapter 13) also provides a unified interface for permitting the user to choose any of the built-in messaging milieus and to send a message through it. However, the Message UI framework and the Social framework remain important, because the user can be presented with a message form without having to pass through an activity view, and because you can fill in fields, such as the recipient field in a mail composition form, that UIActivityViewController doesn’t let you fill in.
Another option is to form a URL of the appropriate scheme and hand it to UIApplication’s openURL: method. For example, given a mailto: URL, openURL: can generate a proposed mail message with an initial recipient field and subject field. (See the Apple URL Scheme Reference for a list of built-in URL ...
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