The Gourmet iOS Developer's Cookbook

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 Core iOS 6 Developer's Cookbook, Fourth Edition. She has blogged at TUAW.com, 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 domination.

Preface   xiii

Chapter 1: Media   1



Speech   1

Other Options   3

Delegate Callbacks   3

Dictation   5

Creating Barcodes   5

Filter Parameters   5

Building Codes   6

Reading Barcodes   8

Listening for Metadata Objects   10

Responding to Metadata   11

Extracting Bounds   13

Enhancing Recognition   14

Detecting Faces   14

Building AVFoundation Movies   14

Creating a Pixel Buffer   16

Drawing into the Pixel Buffer   17

Expressive Drawing   18

Building Movies from Frames   19

Adding Images to Movies   23

Wrap-up   24

Chapter 2: Dynamic Typography   25

Type Size and User Needs   25

How Dynamic Type Works   25

Listening for Type Updates   28

Handling Dynamic Type with Attributes   31

Scanning for Text Style Ranges   32

Applying Text Style Ranges   34

Attribute-Ready Dynamic Elements   35

Custom Fonts Faces   36

Dynamic Text Views   37

Custom Sizing   38

Font Descriptors   39

Descriptor Challenges   40

Fonts with Multiple Variations   41

Using String Attributes to Modify Fonts   42

Dynamic Type Gotchas   43

Wrap-up   43

Chapter 3: Text Kit   45

Creating Complex Text Layouts   45

Glyphs   46

Text Storage   55

Layout Managers   56

Text Containers   56

Adaptive Flow   58

Insets   60

Exclusion Paths   60

Bounding Rectangles   62

Using Text Kit to Add Touch to Labels   63

Establishing Text Kit   63

Synchronizing   64

Translating Coordinates   65

Glyphs and Characters   66

Checking for Links   67

Adding Visual Feedback   67

Draggable Exclusion Zones   69

Building PDFs with Text Kit   71

Printing Text View Data   73

Printing PDF Data   74

Wrap-up   74

Chapter 4: Attributed Strings and Document Containers   75

Class Enhancements   75

String Attachments   77

Building Attributed Strings from HTML   78

Document Type Dictionaries   79

Converting HTML Source to Attributed Strings   80

Converting Attributed Strings to Document Representations   81

Generating HTML from Attributed Strings   82

Markup Initialization   83

RTF and RTFD   83

The RTFD Container   84

Initializing Attributed Strings from a File   84

Converting RTFD Text to Data   85

Writing RTFD Containers from Data   86

Inspecting Attributes   87

Establishing Document Attributes   89

Enhancing Attributed Strings   91

Returning Copies with New Attributes   92

Adjusting Attributes   93

Extending Mutable Attributed Strings   94

Text Ranges   95

Calculating Positions   95

Position Geometry   95

Updating Selection Points   97

Hardware Key Support   97

Wrap-up   99

Chapter 5: Animation   101

Keyframe Animation   101

Building Physics with Keyframes   103

Blocking Animators   105

UIKit Spring-Based Animations   106

Practical Uses for Spring Animations   108

System Animations   109

Motion Effects   109

Building Planes   110

Shadow Effects   111

Custom Transition Animations   113

Delegation   114

Building Transitioning Objects   114

Implicit Animations   116

Building an Animation-Ready Layer   116

Building a View Around a Layer   118

Timing   118

Coordinating Animations   119

Building Implicit Completion Blocks   120

Animating Custom Properties   121

Intercepting Updates   122

Drawing Properties   123

Wrap-up   124

Chapter 6: Dynamic Animators   125

Physics-Based Behaviors   125

Building Dynamics   126

Detecting Pauses   127

Creating a Frame-Watching Dynamic Behavior   131

Implementing Snap Zones   133

Leveraging Real-World Physics   135

Connecting a Gravity Behavior to Device Acceleration   137

Creating Boundaries   138

Enhancing View Dynamics   138

Custom Behaviors   139

Creating Custom Dynamic Items   139

Subverting Dynamic Behaviors   141

Better Custom Dynamic Behaviors   142

Custom Secondary Behaviors   144

Collection Views and Dynamic Animators   147

Custom Flow Layouts   147

Returning Layout Attributes   148

Updating Behaviors   149

Building a Dynamic Alert View   150

Connecting Up the Jelly   150

Drawing the View   152

Deploying Jelly   154

Wrap-up   154

Chapter 7: Presentations   155

Alerts   155

Class Deprecations   155

Building Alerts   156

Enabling and Disabling Alert Buttons   161

Adding Text Fields   162

Mask Views   164

Shape Layer Masking   164

Building Mask Views   166

Building Effect Views   169

Building a Blur Effect   170

Adding Vibrancy Effects   171

Animating Effect Views   172

Building Popovers   175

Supporting Bubbles   176

Presenting Popovers   177

Wrap-up   177

Chapter 8: Shape Magic   179

How to Shape a View   179

Expanding Beyond Circles   180

Resizing Bezier Paths   180

Building a Bezier-Based Shape Image View   184

Working with Unclosed Shapes   185

Adding Borders to Shaped Views   187

Building Shaped Buttons   190

Adding Attention-Grabbing Animations to Shaped Views   193

Wrap-up   199

Chapter 9: Adaptive Deployment   201

Traits   201

Trait Properties   202

Defining Traits   202

Combining Trait Collections   203

Designing for Traits   204

UIScreen Properties   205

Coordinate Spaces   205

Application Frame   206

Screen Bounds   206

Scale   207

Rotation   207

Size Classes and Assets   208

Basic Deployment   208

UIKit and Image Views   210

The UIImageAsset Class   210

Building Images from PDFs   211

Overriding Trait Collections   214

Building Side-by-Side iPhone Split Views   215

A Bit More About iOS 8 Split View Controllers   218

Wrap-up   219

Chapter 10: Development Helpers   221

All the Lorems   221

Placeholder Text   221

Image Ipsums   223

Generating Random User Data   225

Bulk Names   225

Generating Random Feeds   227

Random Everything   228

Directives   229

Converting Comments to Warnings   229

Warnings   231

Testing for the Simulator   232

Errors   232

Testing for Inclusion   233

Messages   234

Wrapping Pragmas   234

Overriding Diagnostics   235

Unused Variable Warnings   235

Marking Non-null and Nullable Items   236

Developer Tweaks   236

Saving Files from the Simulator   237

Tighter Logging   238

Wrap-up   238

Chapter 11: A Taste of Swift   239

Swift Versus Objective-C   239

Building iOS Apps in Swift   240

Optionals   243

Inferred Types   244

The Optional Enumeration   245

Unwrapping Optionals   246

Assigning Values to Non-optionals   248

Cocoa Touch Patterns   248

Hybrid Language Development   251

Calling Objective-C from Swift   252

Accessing Classes   252

Calling Swift from Objective-C   253

Preparing Swift for Objective-C   254

Class Descent   255

Building the Basics   256

Watching Progress   257

Learning Swift   259

Wrap-up   260

Index   261