book

iOS 10 Swift Programming Cookbook

by Vandad Nahavandipoor

December 2016

Intermediate to advanced

456 pages

8h 46m

English

O'Reilly Media, Inc.

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AudienceOrganization of This BookAdditional ResourcesUsing Code ExamplesO’Reilly SafariHow to Contact UsAcknowledgments
1.1. Setting Up a Sticker Pack Application1.2. Adjusting Sticker Sizes1.3. Building a Full-Fledged iMessage Application1.4. Adding an iMessage App Extension to an Existing App1.5. Utilizing an Expanded View in a Sticker Pack App1.6. Appending Rich Information to Stickers1.7. Creating Interactive Conversations with iMessage Apps
2.1. Setting Up Your Project for Siri2.2. Defining an Intent Handler2.3. Resolving Ambiguity in an Intent2.4. Reporting Progress for Resolving an Intent2.5. Handling an Intent
3.1. Converting Between and Working with Length Units3.2. Working with and Switching Between Angle Units3.3. Representing and Converting Between Durations of Time3.4. Using and Working with Frequency Units3.5. Working with and Using Power Units3.6. Representing and Comparing Temperature Units3.7. Working with and Converting Volume Units
4.1. Designing Your Database Scheme4.2. Writing Data to the Database4.3. Reading Data from the Database4.4. Searching for Data in the Database4.5. Performing Background Tasks with Core Data
5.1. Handling Errors in Swift5.2. Specifying Preconditions for Methods5.3. Ensuring the Execution of Code Blocks Before Exiting Methods5.4. Checking for API Availability5.5. Categorizing and Downloading Assets to Get Smaller Binaries5.6. Exporting Device-Specific Binaries5.7. Linking Separate Storyboards Together5.8. Adding Multiple Buttons to the Navigation Bar5.9. Optimizing Your Swift Code5.10. Showing the Header View of Your Swift Classes5.11. Creating Your Own Set Types5.12. Conditionally Extending a Type5.13. Building Equality Functionality into Your Own Types5.14. Looping Conditionally Through a Collection5.15. Designing Interactive Interface Objects in Playgrounds5.16. Grouping Switch Statement Cases Together5.17. Bundling and Reading Data in Your Apps
6.1. Animating Views6.2. Attaching Live Views to Playgrounds6.3. Running Playgrounds as Interactive and Continuous Apps6.4. Arranging Your Components Horizontally or Vertically6.5. Customizing Stack Views for Different Screen Sizes6.6. Creating Anchored Constraints in Code6.7. Allowing Users to Enter Text in Response to Local and Remote Notifications6.8. Dealing with Stacked Views in Code6.9. Showing Web Content in Safari View Controller6.10. Laying Out Text-Based Content on Your Views6.11. Improving Touch Rates for Smoother UI Interactions6.12. Supporting Right-to-Left Languages6.13. Associating Keyboard Shortcuts with View Controllers6.14. Recording the Screen and Sharing the Video
7.1. Downloading Files onto the Apple Watch7.2. Noticing Changes in Pairing State Between the iOS and Watch Apps7.3. Transferring Small Pieces of Data to and from the Watch7.4. Transferring Dictionaries in Queues to and from the Watch7.5. Transferring Files to and from the Watch7.6. Communicating Interactively Between iOS and watchOS7.7. Setting Up Apple Watch for Custom Complications7.8. Constructing Small Complications with Text and Images7.9. Displaying Time Offsets in Complications7.10. Displaying Dates in Complications7.11. Displaying Times in Complications7.12. Displaying Time Intervals in Complications7.13. Recording Audio in Your Watch App7.14. Playing Local and Remote Audio and Video in Your Watch App
8.1. Creating Contacts8.2. Searching for Contacts8.3. Updating Contacts8.4. Deleting Contacts8.5. Formatting Contact Data8.6. Picking Contacts with the Prebuilt System UI8.7. Creating Contacts with a Prebuilt System UI8.8. Displaying Contacts with a Prebuilt System UI
9.1. Creating Safari Content Blockers9.2. Creating Shared Links for Safari9.3. Maintaining Your App’s Indexed Content

10.1. Making Your App’s Content Searchable10.2. Making User Activities Searchable10.3. Deleting Your App’s Searchable Content
11.1. Supporting Split Views11.2. Adding Picture in Picture Playback Functionality11.3. Handling Low Power Mode and Providing Alternatives
12.1. Displaying a Specific Location on the Map12.2. Requesting the User’s Location a Single Time12.3. Requesting the User’s Location in the Background12.4. Customizing the Tint Color of Pins on the Map12.5. Providing Detailed Pin Information with Custom Views12.6. Displaying Traffic, Scale, and Compass Indicators on the Map12.7. Providing an ETA for Transit Transport Type12.8. Launching the iOS Maps App in Transit Mode12.9. Showing Maps in Flyover Mode
13.1. Preparing Your Project for UI Testing13.2. Automating UI Test Scripts13.3. Testing Text Fields, Buttons, and Labels13.4. Finding UI Components13.5. Long-Pressing on UI Elements13.6. Typing Inside Text Fields13.7. Swiping on UI Elements13.8. Tapping UI Elements
14.1. Querying Pace and Cadence Information14.2. Recording and Reading Accelerometer Data
15.1. Protecting Your Network Connections with ATS15.2. Binding Keychain Items to Passcode and Touch ID15.3. Opening URLs Safely15.4. Authenticating the User with Touch ID and Timeout
16.1. Reading Out Text with the Default Siri Alex Voice16.2. Downloading and Preparing Remote Media for Playback16.3. Enabling Spoken Audio Sessions
17.1. Adding a Radial Gravity Field to Your UI17.2. Creating a Linear Gravity Field on Your UI17.3. Creating Turbulence Effects with Animations17.4. Adding Animated Noise Effects to Your UI17.5. Creating a Magnetic Effect Between UI Components17.6. Designing a Velocity Field on Your UI17.7. Handling Collisions Between Nonrectangular Views

Content preview from iOS 10 Swift Programming Cookbook

Chapter 3. Measurements and Units

We have all been there! You need to convert one unit to another, and you begin your journey, most of the time, by Googling what the conversion should be. With iOS 10 SDK, you can now use some built-in structures to represent and convert your units.

The following classes and structures appear throughout this chapter:

Unit: The base class for all the units that are in the SDK itself. This class defines a symbol for the unit, such as m for meters.
Dimension: The class that inherits from Unit and defines the converter to be used between various units.
UnitLength, UnitMass, and the like: Basic units that inherit from Dimension. Each unit offers alternative ways of representing a particular measure, such as length or mass. Each unit also standardizes the various symbols for its measure, such as m for meters, km for kilometers, and smi for Scandinavian miles (with each Scandinavian mile being equal to 1 kilometer).
Measurement: The base structure for defining a value with a unit. Every measurement has a value of type Double and a unit of type Unit.

3.1 Converting Between and Working with Length Units

Problem

You want to be able to represent values with the unit of length, such as kilometers and miles, and would like to be able to perform some basic tasks on them, such as converting one unit to another, or adding and subtracting values represented in different units.