Objective-C Fundamentals

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Part 3 Making maximum use of framework functionality If every iOS application had to reinvent the wheel, there would be significantly fewer applications in the iTunes App Store, because developers would waste time recreating classes to perform similar functionality. The Cocoa Touch environment provides a number of support libraries and classes that, with a few simple lines of code, enable fairly powerful and complex behavior to be available for application developers to use. To quickly come to market, and focus more time on the aspects of your applications that make it unique, it’s important for application developers to know what kind of services the iOS SDK provides, and how to take advantage of them. This part of the book begins by showing how <strong>Objective</strong>-C frameworks typically handle error conditions and exceptions. It then takes a deep dive into two semi-related technologies, called Key Value Coding (KVC) and NSPredicate, that allow flexible sorting and filtering to be introduced within your applications. These two technologies also demonstrate how certain knowledge can be reutilized, as shown in the discussion about using Core Data to work with databases using KVC and NSPredicate. The second half of this part shows how you can deliver a great user experience within your application while performing many tasks as once, or waiting for external web services to respond. Nothing is worse than an application that
202 PART 3 Making maximum use of framework functionality becomes unresponsive for long periods of time, and Grand Central Dispatch (GCD) can help with this. We also introduce some tools that can help with debugging and diagnosing performance- and memory-related issues as your own applications become more complex.
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Christopher K. Fairbairn Johannes F
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Objective-C Fundamentals CHRISTOPHE
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PART 1 brief contents GETTING START
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viii CONTENTS 1.5 Compiling the Coi
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x CONTENTS 5.4 Declared properties
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xii CONTENTS PART 3 MAKING MAXIMUM
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preface Having been involved in the
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ACKNOWLEDGMENTS xvii Christopher wo
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ABOUT THIS BOOK xix skills. There
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author online Purchase of Objective
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Part 1 Getting started with Objecti
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4 CHAPTER 1 Building your first iOS
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10 CHAPTER 1 Building your first iO
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Data types, variables, and constant
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30 CHAPTER 2 Data types, variables,
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56 CHAPTER 3 An introduction to obj
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Storing data in collections This ch
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76 CHAPTER 4 Storing data in collec
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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
Page 174 and 175: Important protocols 151 iPhone UIKi
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Page 178 and 179: Important protocols 155 Any table v
Page 180 and 181: Important protocols 157 or in table
Page 182 and 183: Important protocols 159 For s
Page 184 and 185: Important protocols 161 Listing 7.1
Page 186 and 187: Dynamic typing and runtime type inf
Page 188 and 189: Static vs. dynamic typing 165 If yo
Page 190 and 191: How messaging works 167 Messages ar
Page 192 and 193: How messaging works 169 8.3.2 Handl
Page 194 and 195: Runtime type information 171 The if
Page 196 and 197: Runtime type information 173 8.4.3
Page 198 and 199: Practical uses of runtime type intr
Page 200 and 201: Memory management This chapter cove
Page 202 and 203: Reference counting 179 Figure 9.1 A
Page 204 and 205: Reference counting 181 the object i
Page 206 and 207: Reference counting 183 Keep yoursel
Page 208 and 209: Autorelease pools 185 Ideally, you
Page 210 and 211: Autorelease pools 187 With knowledg
Page 212 and 213: Autorelease pools 189 i * 1000 + j]
Page 214 and 215: Memory zones 191 Memory zones have
Page 216 and 217: Responding to low-memory warnings 1
Page 222 and 223: Summary 199 addObserver:selector:na
Page 226 and 227: Error and exception handling This c
Page 228 and 229: NSError—handling errors the Cocoa
Page 230 and 231: Creating NSError objects 207 chapte
Page 232 and 233: Creating NSError objects 209 10.2.2
Page 234 and 235: Summary 211 10.3.2 Catching excepti
Page 236 and 237: Making your objects KVC-compliant 2
Page 238 and 239: Making your objects KVC-compliant 2
Page 240 and 241: Handling special cases 217 This que
Page 242 and 243: Filtering and matching with predica
Page 248 and 249: Sample application 225 rentingFor:2
Page 250 and 251: Summary 227 The core of the logic o
Page 252 and 253: Core Data history 229 Structured Qu
Page 254 and 255: Core Data objects 231 In Xcode you
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Page 258 and 259: 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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