Core Data for IOS

69 Caching Information 72 Using an NSFetchedResultsController in the Random Dates Application 73 Subclassing NSFetchedResultsController 80 Summary 85 6 Working with Managed Objects 87 Basic Managed Object Subclass Files 87 Creating the Random People Project 88 Managed Object Class Interfaces 89 Managed Object Class Implementations 90 Configuring the Random People Application 93 Displaying the Information 95 Data Validation 99 Validating Individual Properties 99 Validation Based on Other Properties 101 Validation Prior to Deletion 104 Fixing the Random People Application 105 Working with Transient Attributes 105 Modifying the Data Model 106 Adding to the AWPerson Interface and Implementation 106 Adding a Getter Method for the Transient Property 108 Adding a Setter Method for the Transient Property 110 Using the UIColor Property 111 Working with Transformable Attributes 113 The Managed Object Lifecycle 114 Initializing Non-persistent Properties 114 Summary 116 7 Working with Predicates 117 Predicate Basics 117 Creating Predicates Using Format Strings 118 Predicate Variables 120 Predicate Comparison Operators 122 Key Paths 123 Comparing Strings 124 Compound Predicates 126 NSCompoundPredicate 128 Sets and Relationships 129 Examining SQL Queries 130 Adding a Search Display Controller 130 Setting a Fetch Predicate 132 Modifying the Search Predicate 136 Adding a Search Scope Bar Filter 139 Summary 141 8 Migration and Versioning 143 The Migration Problem 143 Changing the Data Model 144 Multiple Data Model Versions and Lightweight Migration 145 Creating Data Model Versions 145 Enabling Lightweight Migration 146 Renaming Entities and Attributes 148 Supplying Renaming Identifiers 150 Keeping Track of Multiple Versions 151 Mapping Models 152 Custom Entity Migration Policies 156 Summary 160 9 Working with Multiple View Controllers and Undo 163 Editing Managed Objects 163 Keeping Track of the Managed Object to Edit 164 Updating a Managed Object's Properties 168 Validating Managed Objects 171 Working with Undo 174 Multiple Managed Object Contexts 175 Merging Changes from Other Managed Object Contexts 178 Changing Managed Object Values Whenever the Control Values Change 179 Resetting a Managed Object Context 181 Using the Editor Controller to Add New Objects 182 Summary 183 Part III Building a Simple Core Data Application 10 Sample Application: Note Collector 187 The Note Collector Application 187 Creating the Note Collector Project 188 The Application Data Model 188 Modeling an Abstract Entity 189 Modeling Sub-entities 189 Creating Managed Object Class Files 190 Configuring the RootViewController 192 Displaying the Contents of a Collection 195 Keeping Track of the Collection to be Displayed 196 Examining the Contents of a Raw Data File 200 Setting and Editing an Item Name 202 Creating the New View Controller 203 Displaying and Editing Notes 210 Supplying a Pre-Populated Data Store 217 Working with a Data Store in the Application Bundle 217 Summary 219 Part IV Optimizing and Troubleshooting 11 Optimizing for iOS Performance and Memory Requirements 223 Performance, Optimization, and Speed 224 Data Store Types 224 Binary and Memory Data Stores 225 SQLite Data Store 225 Monitoring SQLite Stores 225 Optimizing Fetching 230 Setting Fetch Limits 230 Optimizing Predicates 231 Pre-Fetching Relationships 233 Pre-Fetching Any Object 234 Pre-Loading Property Values 235 NSFetchedResultsController and Sections 235 Managing Faulting 235 "Safe" Fault-Free Methods 236 Preventing Property Loading 237 Batch Faulting 237 Re-faulting Objects 237 Managing BLOBs 238 Putting BLOBs in the Entity That Uses Them 239 Putting BLOBs in a Separate Entity 240 Putting BLOBs in External Files 242 Monitoring Core Data with Instruments 245 When Not to Use Core Data 248 Other Memory Management Tips 248 Don't Use an Undo Manager If You Don't Need It 249 Resetting the Managed Object Context 249 Summary 249 12 Troubleshooting Core Data 251 Your First Core Data Error 251 The Missing Model 254 Classes Not Found? 255 Core Data Threading Issues 257 Basics of Core Data Multithreading 257 Coordinating Data Between Threads 258 When Threads Collide, or Handling Data Conflicts 260 Danger! Temporary ID! 264 Problems Using Managed Objects 265 Crashing When Setting Property Values 265 If Custom Accessor Methods Aren't Called 266 Managed Object Invalidated 267 Faults That Can't Be Fulfilled 268 Problems Fetching Objects 269 Trouble Sorting Data During Fetches 269 Fetch Results Not Showing Recent Changes 270 Summary 270 Index 271