Slider in iOS Swift - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a UISlider in iOS development?

A UISlider is a control that lets users select a single value from a continuous range by moving a thumb along a track.

beginner

How do you set the minimum and maximum values of a UISlider?

Use the properties minimumValue and maximumValue to set the slider's range.

beginner

Which method is commonly used to detect when the slider value changes?

You add a target-action for the .valueChanged event to run code when the slider moves.

beginner

How can you get the current value of a UISlider?

Access the slider's value property, which is a Float representing the current position.

intermediate

Why is it important to set accessibility labels for sliders?

Accessibility labels help users with disabilities understand the slider's purpose and current value when using assistive technologies.

What property of UISlider sets the lowest value the user can select?

A minValue

B lowestValue

C minimumValue

D startValue

The property minimumValue defines the lowest selectable value on a UISlider.

Which event should you listen to for detecting slider value changes?

A .valueChanged

B .touchDown

C .editingDidEnd

D .touchUpInside

The .valueChanged event fires whenever the slider's value changes.

What type is the value property of UISlider?

A Int

B Float

C Double

D String

The value property is a Float representing the slider's current position.

How do you add a target-action to a UISlider in Swift?

A slider.addTarget(self, action: #selector(method), for: .valueChanged)

B slider.setAction(#selector(method))

C slider.onChange = method

D slider.delegate = self

You use addTarget(_:action:for:) with the .valueChanged event.

Why should you provide an accessibility label for a slider?

A To disable the slider

B To improve app performance

C To change the slider's color

D To help users with screen readers understand the slider

Accessibility labels describe the slider for users relying on assistive technologies.

Explain how to create a UISlider that lets users pick a value between 0 and 100 and how to respond when the value changes.

Think about properties and event handling.

Describe why accessibility is important for sliders and how you can make a UISlider accessible.

Consider users who cannot see the screen.