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Challenge: Removing an Image
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Challenge: Removing an Image
by Aaron Hillegass, Joe Conway
iOS Programming: The Big Nerd Ranch Guide, Second Edition
Title Page
Acknowledgments
Introduction
Prerequisites
What’s Changed in the Second Edition?
Our Teaching Philosophy
How To Use This Book
Using an eBook
How This Book Is Organized
Style Choices
Typographical Conventions
Necessary Hardware and Software
1. A Simple iOS Application
Creating an Xcode Project
Building Interfaces
Model-View-Controller
Declarations
Declaring instance variables
Declaring methods
Making Connections
Setting pointers
Setting targets and actions
Summary of connections
Implementing Methods
Build and Run on the Simulator
Deploying an Application
Application Icons
Launch Images
2. Objective-C
Objects
Using Instances
Creating objects
Sending messages
Destroying objects
Writing the RandomPossessions Tool
NSString
NSArray and NSMutableArray
Subclassing an Objective-C Class
Instance variables
Accessor methods
Instance methods
Initializers
id
isa
Implementing the designated initializer
self
super
Other initializers and the initializer chain
Class methods
Testing your subclass
Exceptions and the Console Window
Fast Enumeration
Challenge
3. Memory Management
Memory Management Basics
Managing memory in C
Managing memory with objects
Reference Counting
Using retain counts
Using autorelease
Accessors and memory management
Implementing dealloc
Simplifying accessors with properties
copy and mutableCopy
Retain count rules
For the More Curious: More on Memory Management
4. Delegation and Core Location
Projects, targets, and frameworks
Core Location
Receiving updates from CLLocationManager
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13. Camera
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For the More Curious: Recording Video
Challenge: Removing an Image
Add a button that clears the image for a possession.
Add Highlight
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