Book Image

Mac Application Development by Example: Beginner's Guide

By : Robert Wiebe
Book Image

Mac Application Development by Example: Beginner's Guide

By: Robert Wiebe

Overview of this book

It's never been more important to have the ability to develop an App for Mac OS X. Whether it's a System Preference, a business app that accesses information in the Cloud, or an application that uses multi-touch or uses a camera, you will have a solid foundation in app development to get the job done.Mac Application Development by Example takes you through all the aspects of using the Xcode development tool to produce complete working apps that cover a broad range of topics. This comprehensive book on developing applications covers everything a beginner needs to know and demonstrates the concepts using examples that take advantage of some of the most interesting hardware and software features available.You will discover the fundamental aspects of OS X development while investigating innovative platform features to create a final product which take advantage of the unique aspects of OS X.Learn how to use Xcode tools to create and share Mac OS X apps. Explore numerous OS X features including iCloud, multi-touch trackpad, and the iSight camera.This book provides you with an illustrated and annotated guide to bring your idea to life using fundamental concepts that work on Mac.
Table of Contents (17 chapters)
Mac Application Development by Example Beginner's Guide
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Time for action – writing the readDefaults:forKey: program code


Now we can jump in and write the program code to implement this method as follows:

  1. Start by putting a comment in the NewDefaults.m file that describes the method in plain English:

    /*
        This method will execute the command line tool defaults
        to read a value from a domain for a specific key
     
        Input: 
            a_domain - a reverse domain id for the defaults to read
            a_key - a key value to read
     
        Output:
            Either the string value of the result or Nil if there
            is no value to return.
     */

    Tip

    It's always a good idea to explain our methods using this kind of plain English comment block.

  2. The method needs to match the interface from the .h file. So now we can add the function body to the .m file. Note the opening and closing braces that delimit the start and the end of the method. The implementation of the method will appear between these braces as shown in the following code snippet:

    - (NSString *) readDefaults...