Stepper in iOS Swift - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is a Stepper in iOS development?

A Stepper is a UI control that lets users increase or decrease a value by tapping plus or minus buttons. It’s like a small counter you can tap to go up or down.

beginner

How do you create a Stepper in SwiftUI?

You use the Stepper view with a binding to a value. For example: Stepper("Count: \(count)", value: $count, in: 0...10) creates a stepper that changes the count between 0 and 10.

beginner

What does the value parameter in a Stepper do?

It binds the Stepper to a variable that stores the current number. When the user taps plus or minus, this variable changes automatically.

beginner

How can you limit the range of values a Stepper can select?

You set a range using the in: parameter, like in: 0...5. This means the Stepper won’t go below 0 or above 5.

intermediate

What is the purpose of the step: parameter in a Stepper?

It controls how much the value changes each time you tap plus or minus. For example, step: 2 means the value goes up or down by 2 each tap.

What does a Stepper control do in an iOS app?

A Plays a video

B Displays a list of items

C Shows an image gallery

D Increases or decreases a numeric value

A Stepper lets users increase or decrease a number by tapping plus or minus buttons.

Which SwiftUI view is used to create a Stepper?

A Stepper

B Slider

C Button

D TextField

The Stepper view creates a control for incrementing or decrementing a value.

How do you restrict a Stepper’s value between 1 and 10?

A Use <code>range: 1...10</code>

B Use <code>bounds: 1 to 10</code>

C Use <code>in: 1...10</code>

D Use <code>limit: 1 to 10</code>

The in: parameter sets the allowed range for the Stepper’s value.

What happens if you set step: 5 in a Stepper?

A Value changes by 5 each tap

B Value changes by 1 each tap

C Value changes randomly

D Value does not change

The step: parameter controls how much the value changes per tap.

Which of these is a correct way to bind a Stepper to a variable named count?

A Stepper("Count", value: count)

B Stepper("Count", value: $count)

C Stepper("Count", value: &count)

D Stepper("Count", value: *count)

You bind a Stepper to a variable using the $ prefix to pass a binding.

Explain how to create a Stepper in SwiftUI that counts from 0 to 20 with steps of 2.

Think about the parameters: value, in, and step.

Describe what happens when a user taps the plus button on a Stepper control.

Consider the binding and range parameters.