Objective-C Fundamentals

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Filtering and matching with predicates 221 Table 11.2 Common comparison operators for use with NSPredicate expressions. Notice that a number of operators have alternative symbols. (continued) Operator Description Example >=, => Greater than or equal to rentalPrice >= 350 < Less than rentalPrice < 350
222 CHAPTER 11 Key-Value Coding and NSPredicate Table 11.3 String operators available to NSPredicate-based predicate expressions. Regular expressions are a powerful way to validate string values against patterns, such as "valid email address" or "valid phone number". Operator Description Example BEGINSWITH Does string begin with the specified prefix? address BEGINSWITH '17' ENDSWITH Does string end with the specified postfix? address ENDSWITH 'Street' CONTAINS Does string contain the specified string somewhere? address CONTAINS 'egg' LIKE Does string match the specified pattern? A ? will match any character, while * matches 0 or more. address LIKE '?? Kipling*' MATCHES Does string match the specified regular expression? In the example to the right, this matches any string that starts with a 4 or a 7. address MATCHES '[47].*' Similar to a number of comparison operators that have alternative symbols, the compound predicates all have two valid forms. Parentheses can be utilized to ensure evaluation order is correct in the case of more complex expressions, especially those that include calculations. Another operator worth mentioning, especially if your object contains enumerated data types such as CTRentalProperty’s propertyType property, is the IN operator. This allows you to simplify the syntax for comparing a value against a number of possible values. For example, if you want to match rental properties that are Town- Houses or Units, you can use the following NSPredicate expression: propertyType IN { 0, 1 } The values 0 and 1 match the enumerated types TownHouse and Unit respectively, meaning that this expression is logically equivalent to the much wordier expression: (propertyType = 0) or (propertyType = 1) 11.3.5 Using key paths in predicate expressions We’ve demonstrated the use of NSPredicate with expressions that compare single property values against hardcoded constants, but it’s possible to use virtually any key path in an NSPredicate expression. This means you can develop some pretty complex filter conditions. For example, the following predicate will match all rental properties with addresses consisting of at least 30 characters: address.length > 30 It’s also possible, using a range of additional operators, to perform set-based conditions whenever an array or similar collection is present in a key path. Table 11.4 lists some examples.
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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
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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
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 224 and 225: Part 3 Making maximum use of framew
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
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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
Page 256 and 257: Core Data resources 233 careful to
Page 258 and 259: Building the PocketTasks applicatio
Page 274 and 275: Beyond the basics 251 How do you us
Page 276 and 277: Beyond the basics 253 All you do is
Page 278 and 279: Beyond the basics 255 attributeName
Page 280 and 281: Blocks and Grand Central Dispatch T
Page 282 and 283: The syntax of blocks 259 What if yo
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Page 288 and 289: Performing work asynchronously 265
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Performing work asynchronously 271
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Performing work asynchronously 273
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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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