The Core iOS Developer's Cookbook

• Creating direct touch-based interfaces with multi-touch, gestures, and custom gesture recognizers
• Building and customizing controls in powerful ways
• Adding novel motion effects
• Alerting users via pop-ups, progress bars, local notifications, popovers, audio cues, and more
• Using Xcode modules to easily integrate system frameworks and headers
• Assembling views and animation, organizing view hierarchies, and understanding how views work together
• Supporting multiple screen geometries with the breakthrough Auto Layout constraints system
• Controlling keyboards, making onscreen elements “text aware,” and efficiently scanning and formatting text
• Organizing user workspaces with view controllers
• Managing photos, videos, email, and text messages
• Leveraging enhanced iOS support for social media activities, including Flickr and Vimeo
• Implementing VoiceOver accessibility, including text-to-speech
• Getting started with Core Data-managed data stores
• Leveraging powerful networking and web services support
• Using APIs to enhance the user experience

Erica Sadun is the bestselling author, coauthor, and contributor to several dozen books on programming, digital video and photography, and web design, including the widely popular The iOS 5 Developer’s Cookbook. She currently blogs at TUAW.com, and has blogged in the past at O’Reilly’s Mac Devcenter, Lifehacker, and Ars Technica. In addition to being the author of dozens of iOS-native applications, Erica holds a Ph.D. in Computer Science from Georgia Tech’s Graphics, Visualization and Usability Center. A geek, a programmer, and an author, she’s never met a gadget she didn’t love. When not writing, she and her geek husband parent three geeks-in-training, who regard their parents with restrained bemusement, when they’re not busy rewiring the house or plotting global dominance.

Rich Wardwell is a Senior iOS and Mac Developer at Black Pixel and has been a developer for the past 12 years. He received his MIS from the University of Georgia in 1997. Rich has served as a Technical Editor for The Core iOS 6 Developer's Cookbook and The Advanced iOS 6 Developer's Cookbook, both by author Erica Sadun, as well as several other Addison-Wesley iOS developer titles.

-From Previous Edition

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

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