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 – examining a variable value


Since BuggyCalc has crashed, and Xcode has brought itself to the foreground with the Debug area displayed, we can take this opportunity to look at some of the information that is available in the debugger:

  1. Look more closely at the Debug area. You will see it has two panes. On the left-hand side is the variable view and on the right-hand side is the console as shown in the following screenshot:

  2. By looking in the variable view, we can see the actual values that are in our variables when the program ended up in the debugger.

  3. Drag the top of the Debug area up, to make the view larger.

  4. Click on the disclosure triangle beside self to display all the member variables for our AppDelegate as shown in the following screenshot:

What just happened?

When our App was stopped in the debugger we were able to examine the values of variables in the buttonAction: method that were causing the problems. We were also able to examine the variables for the AppDelegate.

There...