In This January Digital Issue:

Table of Contents

FEATURES
• Debugging Memory in an iOS App
  By José R. C. Cruz
Knowing how leaks, dangling pointers, double free operations, and memory hogs look in the Xcode debugger makes them a lot easier to locate and eliminate.


• Handling Touch Input in iOS6
  By Erica Sadun
This article introduces direct manipulation interfaces that go far beyond prebuilt controls, showing how to create views that users can drag around the screen. Also discussed are how to distinguish and interpret gestures, which are a high-level touch abstraction, and gesture recognizer classes, which automatically detect common interaction styles like taps, swipes, and drags.

GUEST EDITORIAL
• You Are No Longer a Testing Expert
  By Dave Berg
The testing and optimizing techniques of the past don't apply to mobile.

FROM THE VAULT
• Managing Memory on iOS
  By José R. C. Cruz
By understanding memory usage patterns on Apple devices, it's possible to conserve memory very effectively.


• LETTERS
  By you
Readers weigh in on error handling and methodology.


• LINKS
  Snapshots of the most interesting items on drdobbs.com including chronic requirements problems and data structure audits.

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