The Core iOS 6 Developer’s Cookbook brings together reliable, proven solutions for the heart of day-to-day iOS 6 development. World-renowned iOS programming expert Erica Sadun covers all the classes you’ll need to create successful iOS 6 mobile apps with standard APIs and interface elements and take full advantage of iOS 6 graphics, touches, and views. As in her previous bestselling iOS books, Sadun translates today’s development best practices into working code, distilling key concepts into concise recipes that are easy to understand and transfer into your own projects. This isn’t just cut-and-paste; using her examples, Sadun fully explains both the “how” and “why” of effective iOS 6 development. All code has been fully revised and extensively tested to reflect the latest iOS 6 features and the newest iPhone, iPad, and iPod touch capabilities. Throughout, every chapter groups related tasks together, so you can jump straight to your solution, without having to identify the right class or framework first. Coverage includes Supporting direct user input through multitouch and gestures, including custom gesture recognizers Building, customizing, and using iOS 6 controls Alerting users via popup dialogs, progress bars, local notifications, popovers, audio pings, and other techniques Assembling views and animation, organizing view hierarchies, and understanding how views work together Using iOS 6’s breakthrough autolayout constraints system to simplify support for multiple screen geometries controlling keyboards, making onscreen elements “text aware,” and efficiently scanning and formatting text Using view controllers to organize your users’ workspaces Managing photos, videos, email, text messages, and iOS 6-enhanced social media updates Implementing VoiceOver accessibility to reach even more users Organizing apps simply and intuitively with tables and adding flexibility with iOS 6’s brand new collection views Getting started with Core Data managed data stores Leveraging iOS 6’s powerful networking and web services support

Table of Contents:
Preface   xxii 1  Gestures and Touches   1 Touches   1   Phases   2   Touches and Responder Methods   3   Touching Views   4   Multi-Touch   4   Gesture Recognizers   5 Recipe: Adding a Simple Direct Manipulation Interface   5 Recipe: Adding Pan Gesture Recognizers   7 Recipe: Using Multiple Gesture Recognizers Simultaneously   9 Resolving Gesture Conflicts   12 Recipe: Constraining Movement   13 Recipe: Testing Touches   15 Recipe: Testing Against a Bitmap   17 Recipe: Drawing Touches Onscreen   19 Recipe: Smoothing Drawings   21 Recipe: Using Multi-Touch Interaction   24 Recipe: Detecting Circles   28 Recipe: Creating a Custom Gesture Recognizer   33 Recipe: Dragging from a Scroll View   35 Recipe: Live Touch Feedback   39   Enabling Touch Feedback    39   Intercepting and Forwarding Touch Events   40   Implementing the TOUCHkit Overlay View   41 Recipe: Adding Menus to Views   44 Summary   46 2  Building and Using Controls   49 The UIControl Class   49   Target-Action   50   Kinds of Controls   50   Control Events   51 Buttons   53 Buttons in Interface Builder   54   Connecting Buttons to Actions   55 Recipe: Building Buttons   55   Multiline Button Text   58   Adding Animated Elements to Buttons   58   Adding Extra State to Buttons   59 Recipe: Animating Button Responses   59 Recipe: Adding a Slider with a Custom Thumb   61   Customizing UISlider   62   Adding Efficiency   63 Appearance Proxies   66 Recipe: Creating a Twice-Tappable Segmented Control   69   Second-Tap Feedback   70   Controls and Attributes   70 Working with Switches and Steppers   72 Recipe: Subclassing UIControl   73   Creating Controls   74   Tracking Touches   74   Dispatching Events   74 Recipe: Building a Star Slider   77 Recipe: Building a Touch Wheel   80 Recipe: Creating a Pull Control   83   Discoverability   83   Testing Touches   85 Recipe: Building a Custom Lock Control   87 Adding a Page Indicator Control   90 Recipe: Creating a Customizable Paged Scroller   93 Building Toolbars   98 Summary   100 3  Alerting the User   101 Talking Directly to Your User Through Alerts   101   Building Simple Alerts   102   Alert Delegates   103   Displaying the Alert   104   Kinds of Alerts   104 “Please Wait”: Showing Progress to Your User   105   Using UIActivityIndicatorView   106   Using UIProgressView   107 Recipe: No-Button Alerts   107   Building a Floating Progress Monitor   109 Recipe: Creating Modal Alerts with Run Loops   110 Recipe: Using Variadic Arguments with Alert Views   113 Presenting Lists of Options   114   Scrolling Menus   117   Displaying Text in Action Sheets   117 Recipe: Building Custom Overlays   117   Tappable Overlays   119 Recipe: Basic Popovers   119 Recipe: Local Notifications   121   Best Practices   122 Alert Indicators   123   Badging Applications   124 Recipe: Simple Audio Alerts   124   System Sounds   124   Vibration   125   Alerts   126   Delays   126   Disposing of System Sounds   126 Summary   128 4  Assembling Views and Animations   129 View Hierarchies   129 Recipe: Recovering a View Hierarchy Tree   131   Exploring XIB and Storyboard Views   132 Recipe: Querying Subviews   133 Managing Subviews   134   Adding Subviews   134   Reordering and Removing Subviews   135   View Callbacks   135 Tagging and Retrieving Views   136   Using Tags to Find Views   136 Recipe: Naming Views by Object Association   137   Naming Views in Interface Builder   137 View Geometry   139   Frames   140   Rectangle Utility Functions   140   Points and Sizes   141   Transforms   142   Coordinate Systems   142 Recipe: Working with View Frames   143   Adjusting Sizes   144   CGRects and Centers   146   Other Geometric Elements   147 Recipe: Retrieving Transform Information   151   Retrieving Transform Properties   151   Testing for View Intersection   152 Display and Interaction Traits   157 UIView Animations   158   Building Animations with Blocks   159 Recipe: Fading a View In and Out   159 Recipe: Swapping Views   161 Recipe: Flipping Views   162 Recipe: Using Core Animation Transitions   163 Recipe: Bouncing Views as They Appear   165 Recipe: Image View Animations   166 Summary   167 5  View Constraints   169 What Are Constraints?   169 Alignment Rectangles   170   Declaring Alignment Rectangles   171 Constraint Attributes   171   Constraint Math   172 The Laws of Constraints   173 Creating Constraints   175   Basic Constraint Declarations   175   Visual Format Constraints   176   Variable Bindings   177 Format Strings   177   Orientation   177   View Names   179   Connections   179 Predicates   183   Metrics   183   View-to-View Predicates   184   Priorities   184 Format String Summary   184 Storing and Updating Constraints   186 Recipe: Comparing Constraints   187 Recipe: Describing Constraints   189 Recipe: Creating Fixed-Size Constrained Views   192   Disabling Autosizing Constraints   192   Starting within View Bounds   193   Constraining Size   193 Recipe: Centering Views   196 Recipe: Setting Aspect Ratio   197 Aligning Views and Flexible Sizing   199   Why You Cannot Distribute Views   199 Recipe: Responding to Orientation Changes   200 Constraint Macros   202   Consistent Constraints   202   Sufficient Constraints   203   Macros   203 Debugging Your Constraints   205 Summary   207 6  Text Entry   209 Recipe: Dismissing a UITextField Keyboard   209   Preventing Keyboard Dismissal   210   Text Trait Properties   211   Other Text Field Properties   212 Recipe: Dismissing Text Views with Custom Accessory Views   213 Recipe: Adjusting Views Around Keyboards   216 Recipe: Adjusting Views Around Accessory Views   220   Testing for Hardware Keyboards   221 Recipe: Creating a Custom Input View   223 Recipe: Making Text-Input-Aware Views   227 Recipe: Adding Custom Input Views to Nontext Views   230   Adding Input Clicks   231 Recipe: Building a Better Text Editor (Part I)   233 Recipe: Building a Better Text Editor (Part II)   236   Enabling Attributed Text   236   Controlling Attributes   236   Other Responder Functionality   237 Recipe: Text-Entry Filtering   239 Recipe: Detecting Text Patterns   242   Rolling Your Own Expressions   242   Enumerating Regular Expressions   243   Data Detectors   243   Using Built-In Type Detectors   244   Useful Websites   244 Recipe: Detecting Misspelling in a UITextView   246 Searching for Text Strings   247 Summary   248 7  Working with View Controllers   249 View Controllers   249   The UIViewController Class   250   Navigation Controllers   250   Tab Bar Controllers   251   Split View Controllers   251   Page View Controller   251   Popover Controllers   251 Developing with Navigation Controllers and Split Views   252   Using Navigation Controllers and Stacks   253   Pushing and Popping View Controllers   254   Bar Buttons   254 Recipe: The Navigation Item Class   255    Titles and Back Buttons   255   Macros   256 Recipe: Modal Presentation   257   Presenting a Custom Modal Information View   258 Recipe: Building Split View Controllers   261 Recipe: Creating Universal Split View/Navigation Apps   266 Recipe: Tab Bars   268 Remembering Tab State   272 Recipe: Page View Controllers   275   Book Properties   276    Wrapping the Implemen  tation   277   Exploring the Recipe   279   Building a Presentation Index   279 Recipe: Scrubbing Pages in a Page View Controller   285 Recipe: Custom Containers   286   Adding and Removing a Child View Controller   287   Transitioning Between View Controllers   288 Recipe: Segues   292   Segues, Interface Builder, and iOS 6   297 Summary   298 8  Common Controllers   299 Image Picker Controller   299   Image Sources   299   Presenting the Picker on iPhone and iPad 300 Recipe: Selecting Images   300   How To: Adding Photos to the Simulator   301   The Assets Library Framework   301   Presenting a Picker   302   Handling Delegate Callbacks   303 Recipe: Snapping Photos   306   Setting Up the Picker   307   Displaying Images   308   Saving Images to the Photo Album   309 Recipe: Recording Video   310   Creating the Video Recording Picker   311   Saving the Video   311 Recipe: Playing Video with Media Player   313 Recipe: Editing Video   316   AV Foundation and Core Media   316 Recipe: Picking and Editing Video   318 Recipe: E-Mailing Pictures   321   Creating Message Contents   321 Recipe: Sending a Text Message   323 Recipe: Posting Social Updates   325 Recipe: Activity View Controller   328   Creating and Presenting the Controller   328   Adding Services   331 I  tems and Services   335 Recipe: The Quick Look Preview Controller   336   Implementing Quick Look   337 Summary   340 9  Accessibility   341 Accessibility 101    341   Accessibility in Interface Builder   342 Enabling Accessibility   343 Traits   344 Labels   345 Hints   346 Testing with the Simulator   347 Broadcasting Updates   348 Testing Accessibility on the iPhone   349 Summary   351 10  Creating and Managing Table Views   353 iOS Tables   353 Delegation   354 Creating Tables   355   Table Styles   355   Laying Out the View   355 Assigning a Data Source   356 Serving Cells   356 Registering Cell Classes   356 Dequeueing Cells   357 Assigning a Delegate   357 Recipe: Implementing a Basic Table   358 Data Source Methods   359 Responding to User Touches   359 Table View Cells   361 Selection Color   362 Adding in Custom Selection Traits   363 Recipe: Creating Checked Table Cells   363 Working with Disclosure Accessories   365 Recipe: Table Edits   367 Adding Undo Support   368 Supporting Undo   369 Displaying Remove Controls   369 Handling Delete Requests   369 Swiping Cells   370 Reordering Cells   370 Adding Cells    370 Recipe: Working with Sections   375 Building Sections    375 Counting Sections and Rows   376 Returning Cells   377 Creating Header Titles   378 Customizing Headers and Footers   379 Creating a Section Index   379 Handling Section Mismatches   380 Delegation with Sections   380 Recipe: Searching Through a Table   382 Creating a Search Display Controller   383 Registering Cells for the Search Display Controller   384 Building the Searchable Data Source Methods   384 Delegate Methods   385 Using a Search-Aware Index   386 Recipe: Adding Pull-to-Refresh to Your Table   388 Recipe: Adding Action Rows   391 Coding a Custom Group Table   394   Creating Grouped Preferences Tables   395 Recipe: Building a Multiwheel Table   396   Creating the UIPickerView   397   Data Source and Delegate Methods   397   Using Views with Pickers   397 Using the UIDatePicker   399   Creating the Date Picker   400 Summary   401 11  Collection Views   403 Collection Views Versus Tables   403   Practical Implementation Differences   405 Establishing Collection Views   405   Controllers   405   Views   406   Data Sources and Delegates   406 Flow Layouts   407   Scroll Direction   407   Item Size and Line Spacing   407   Header and Footer Sizing   409   Insets   410 Recipe: Basic Collection View Flows   411 Recipe: Custom Cells   415 Recipe: Scrolling Horizontal Lists   416 Recipe: Introducing Interactive Layout Effects   420 Recipe: Scroll Snapping   422 Recipe: Creating a Circle Layout   423   Creation and Deletion Animation   424   Powering the Circle Layout   424   The Layout   425 Recipe: Adding Gestures to Layout   429 Recipe: Creating a True Grid Layout   431 Recipe: Custom Item Menus   437 Summary   439 12  A Taste of Core Data   441 Introducing Core Data   441 Entities and Models   442   Building a Model File   442   Attributes and Relationships   443   Building Object Classes   444 Creating Contexts   444 Adding Data   445   Examining the Data File   446 Querying the Database   448   Setting Up the Fetch Request   449   Performing the Fetch   449 Removing Objects   450 Recipe: Using Core Data for a Table Data Source   451   Index Path Access   451   Section Key Path   451   Section Groups   452   Index Titles   452   Table Readiness   452 Recipe: Search Tables and Core Data   455 Recipe: Adding Edits to Core Data Table Views   457   Adding Undo/Redo Support   458   Creating Undo Transactions   459   Rethinking Edits   459 Recipe: A Core Data-Powered Collection View   464 Summary   469 13  Networking Basics   471 Recipe: Checking Your Network Status   471 Scanning for Connectivity Changes   474 Recipe: Synchronous Downloads   476 Recipe: Asynchronous Downloads   480 One-Call No-Feedback Asynchronous Downloads   486 Recipe: Using JSON Serialization   487 Recipe: Converting XML into Trees   489   Trees    489   Building a Parse Tree    490 Summary   492 Appendix Objective-C Literals   495 Numbers   495 Boxing   496   Enums   496 Container Literals   497 Subscripting   498 Feature Tests   499 Index   501