Objective-C Fundamentals

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Summary 27 result of the coin toss by hovering the mouse over the coinLandedOnHeads variable name; once again, YES means heads and NO means tails. Using the step-over feature a couple more times, you can step over the two if statements, which update the result and status UILabels in the user interface. Unlike what you may expect, however, if you check the iPhone device at this stage, the labels won’t have updated! This is because of how the internals of Cocoa Touch operate: the screen will only update once you release the debugger and allow this method to return to the operating system. To allow the iPhone to update the user interface and to see the fancy animations that herald in a new coin toss result, you can click Continue (or press Cmd-Option-P) to allow the application to continue execution until it hits another breakpoint or you explicitly pause it again. Taking a look at the iPhone, you should see that the results of the coin toss are finally displayed onscreen. 1.7 Summary Congratulations, you’ve developed your first iPhone application! Show your friends and family. It may not be the next iTunes App Store blockbuster release, but while putting together this application, you’ve mastered many of the important features of the Xcode IDE, so you’re well on your way to achieving success. Although <strong>Objective</strong>-C is a powerful language with many capabilities, you’ll find using visual tools such as Xcode can lead to a productivity boost, especially during initial prototyping of your application. The decoupling of application logic from how it’s presented to the user is a powerful mechanism that shouldn’t be underestimated. It’s doubtful the first user interface you design for your application will be perfect, and being able to alter it without having to modify a single line of code is a powerful advantage. By the same token, you were able to rely on the Cocoa Touch framework to handle the minutiae of how to implement many of the features of your game. For example, the animations were implemented in a fairly declarative manner: you specified starting and stopping points for the rotations and fading operations and left the Quartz Core framework to worry about the specifics of redrawing the screen, transitioning the animation, and speeding up or slowing down as the effect completed. As you’ll continue to see, there’s great power in the Cocoa Touch frameworks. If you find yourself writing a vast amount of code for a particular feature, chances are you aren’t taking maximum advantage of what Cocoa has to offer. In chapter 2, we dive into data types, variables, and constants and are introduced to the Rental Manager application that you’ll build throughout this book.
Data types, variables, and constants This chapter covers ■ ■ ■ ■ ■ Storing numeric-, logic-, and text-based data Creating your own data types Converting values between different data types Formatting values for presentation Introducing the Rental Manager sample application Virtually every application needs to store, represent, or process data of some kind, whether a list of calendar appointments, the current weather conditions in New York, or the high scores of a game. Because <strong>Objective</strong>-C is a statically typed language, whenever you declare a variable, you must also specify the type of data you expect to store in it. As an example, the following variable declaration declares a variable named zombieCount, which is of type int: int zombieCount; Short for integer, int is a data type capable of storing a whole number between –2,147,483,648 and +2,147,483,647. In this chapter, you’ll discover many data 28
Page 1 and 2: Christopher K. Fairbairn Johannes F
Page 4 and 5: Objective-C Fundamentals CHRISTOPHE
Page 6: PART 1 brief contents GETTING START
Page 9 and 10: viii CONTENTS 1.5 Compiling the Coi
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Page 13 and 14: xii CONTENTS PART 3 MAKING MAXIMUM
Page 16 and 17: preface Having been involved in the
Page 18 and 19: ACKNOWLEDGMENTS xvii Christopher wo
Page 20 and 21: ABOUT THIS BOOK xix skills. There
Page 22 and 23: author online Purchase of Objective
Page 24: Part 1 Getting started with Objecti
Page 27 and 28: 4 CHAPTER 1 Building your first iOS
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Page 79 and 80: 56 CHAPTER 3 An introduction to obj
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Creating classes This chapter cover
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Declaring the interface of a class
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Providing an implementation for a c
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Declared properties 109 - (Property
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Declared properties 111 Let’s bri
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Declared properties 113 Although @s
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Creating and destroying objects 115
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Using the class in the Rental Manag
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Summary 123 a number of rental prop
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Subclassing 125 the only class you
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Adding new instance variables 127 s
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Accessing existing instance variabl
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Overriding methods 131 } return gen
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Overriding methods 133 } "for $%@ p
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Class clusters 135 Figure 6.2 Graph
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Categories 137 This code tells the
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Subclassing in your demo applicatio
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Subclassing in your demo applicatio
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Summary 143 6.8 Summary Object-orie
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Defining a protocol 145 Mastering t
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Implementing a protocol 147 7.2.1 C
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Implementing a protocol 149 Listing
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Important protocols 151 iPhone UIKi
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Important protocols 153 executed. T
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Important protocols 155 Any table v
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Important protocols 157 or in table
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Important protocols 159 For s
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Important protocols 161 Listing 7.1
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Dynamic typing and runtime type inf
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Static vs. dynamic typing 165 If yo
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How messaging works 167 Messages ar
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How messaging works 169 8.3.2 Handl
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Runtime type information 171 The if
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Runtime type information 173 8.4.3
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Practical uses of runtime type intr
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Memory management This chapter cove
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Reference counting 179 Figure 9.1 A
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Reference counting 181 the object i
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Reference counting 183 Keep yoursel
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Autorelease pools 185 Ideally, you
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Autorelease pools 187 With knowledg
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Autorelease pools 189 i * 1000 + j]
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Memory zones 191 Memory zones have
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Responding to low-memory warnings 1
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Summary 199 addObserver:selector:na
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Part 3 Making maximum use of framew
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Error and exception handling This c
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NSError—handling errors the Cocoa
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Creating NSError objects 207 chapte
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Creating NSError objects 209 10.2.2
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Summary 211 10.3.2 Catching excepti
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Making your objects KVC-compliant 2
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Making your objects KVC-compliant 2
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Handling special cases 217 This que
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Filtering and matching with predica
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Sample application 225 rentingFor:2
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Summary 227 The core of the logic o
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Core Data history 229 Structured Qu
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Core Data objects 231 In Xcode you
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Core Data resources 233 careful to
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Building the PocketTasks applicatio
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Beyond the basics 251 How do you us
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Beyond the basics 253 All you do is
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Beyond the basics 255 attributeName
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Blocks and Grand Central Dispatch T
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The syntax of blocks 259 What if yo
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The syntax of blocks 261 change the
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The syntax of blocks 263 } [super d
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Performing work asynchronously 265
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Summary 275 more to learn about GCD
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Building an application, complete w
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Understanding NSLog 279 Figure 14.3
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Bringing memory leaks under control
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Bringing memory leaks under control
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Detecting zombies 285 (and the appl
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Summary 287 and its ease of use and
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Preparing your iOS device for devel
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Preparing your iOS device for devel
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appendix B The basics of C Througho
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Variable naming conventions 295 As
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Expressions 297 Table B.3 Relationa
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Expressions 299 B.2.4 Assignment op
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Conditional statements 301 based on
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Conditional statements 303 The gene
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Looping statements 305 Not as strai
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Looping statements 307 One importan
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Looping statements 309 As in a do l
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Summary 311 CONTINUE The continue s
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A short history of Objective-C 313
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The iPhone SDK: Safari 315 C.2 Alte
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The iPhone SDK: Safari 317 C.3.2 ha
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The iPhone SDK: Safari 319 It’s i
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Scripting languages: Lua and Ruby 3
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Mono (.NET) 323 the iOS platform. F
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Summary 325 Xamarin announced a fol
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index Symbols ^ operator 298 - oper
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INDEX 329 application-specific quer
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INDEX 331 collections (continued) e
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INDEX 333 E e character 35 editButt
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INDEX 335 iOS Developer account 9 i
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INDEX 337 mutableCopyWithZone 190 M
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INDEX 339 Organizer window 291 over
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INDEX 341 setFlag 164 setNilValueFo
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INDEX 343 vardic method 75 variable
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Objective-C Fundamentals

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