Swan's Quest, Chapter 1: Voices in the dark
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Swift Playgrounds presents "Swan’s Quest,” an interactive adventure in four chapters for all ages. In this chapter, our Hero must navigate a dark cave — and the only way to light the torches is to make them accessible. Learn about VoiceOver and write interesting audio descriptions. You just might help our Hero find their way out… and get a clue for the next challenge. Swan’s Quest was created for Swift Playgrounds on iPad and Mac, combining frameworks and resources which power the educational experiences in many of our playgrounds, including Sonic Workshop, Sensor Arcade, and Augmented Reality. To learn more about building your own playgrounds, be sure to watch "Create Swift Playgrounds content for iPad and Mac". And don’t forget to stop by the Developer Forums and let us know what you thought of Swan’s Quest.
Swan's Quest is a series of challenges where each chapter has a specific programming challenge for you that will build on the prior chapters.
To complete the first challenge, you're going to use VoiceOver.
What is VoiceOver?
- VoiceOver is Apple's screen reader
- VoiceOver provides information about text, controls, and other elements as you move through an app's interface using text-to-speech, Braille, or a combination of the two.
In this chapter, you're gonna write code using VoiceOver.
To make it easy for us to toggle VoiceOver: go to
Settings > Accessibility > Accessibility Shortcut and choose VoiceOver.
This will enable you to toggle VoiceOver by pressing three times the home button or the side button (depending on your iPhone form factor).
Alternatively, you can also ask Siri to turn on/off VoiceOver
⌘ + F5, or triple-click the TouchID button to activate VoiceOver.
- You can move the VoiceOver cursor through the screen by pressing
⌃ + ⌥plus either the Left or Right Arrow keys.
- You can navigate up and down by using
⌃ + ⌥plus the Up or Down Arrow keys.
- To enter a group of controls or elements such as the Source Code Editor in Playgrounds, press
⌃ + ⌥ + ⇧plus the Down Arrow to do what it's called interacting.
- To stop interacting, to get out of a group of controls, press
⌃ + ⌥ + ⇧plus the Up Arrow key.
⌃ + ⌥plus the Space Bar to activate a control.
Getting Familiar with Voice Over
Once activated, a black rectangle around the selected control will appear, this is called the VoiceOver cursor, and it confirms visually which item has VoiceOver's focus.
You can flick left or right with one finger to move the cursor over different elements on the screen.
You can drag your finger around the screen to move the cursor over elements more quickly.
To leave an app either: - press the Home button - slide one finger up from the bottom edge of the screen until you hear the first sound. If you pause there, VoiceOver will say, "Lift for Home.". Lift for Home.
For this first challenge, a
PlaygroundModule has been built, this module is part of the Create Quest Playground Book.
SPCAccessibility has four on-screen elements that form its foundation:
All of them inherit from
BaseGraphic, which contains properties for accessibility support.
An example of accessibility property is
AccessibilityHints property: setting this property indicates that this screen element should be read by VoiceOver, and makes it visible to other assistive services.
To support VoiceOver, these are the values you need to supply: -
makeAccessibilityElement tells VoiceOver it should stop the cursor on this item. -
accessibilityLabel is what VoiceOver reads as it stops on the item.
To pass the first challenge..
..you will need to make the screen elements accessible.
cave.torch1.accessibilityHints?.accessibilityLabel = "First torch" cave.torch2.accessibilityHints?.accessibilityLabel = "Second torch" cave.torch3.accessibilityHints?.accessibilityLabel = "Third torch" cave.torch4.accessibilityHints?.accessibilityLabel = "Fourth torch" cave.torch5.accessibilityHints?.accessibilityLabel = "Fifth torch" cave.torch6.accessibilityHints?.accessibilityLabel = "Sixth torch"