VStack, HStack, ZStack in iOS Swift - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a vertical stack of two Text views.

iOS Swift

VStack {
    Text("Hello")
    [1]("World")
}

Drag options to blanks, or click blank then click option'

AText

BVStack

CHStack

DZStack

Attempts:

3 left

💡 Hint

Common Mistakes

Using HStack or ZStack instead of Text inside VStack.

Forgetting to use Text for the second label.

The VStack arranges views vertically. To add a second text, use Text again.

2fill in blank

medium

Complete the code to create a horizontal stack with two Text views.

iOS Swift

HStack {
    Text("Left")
    [1]("Right")
}

Drag options to blanks, or click blank then click option'

AVStack

BZStack

CText

DSpacer

Attempts:

3 left

💡 Hint

Common Mistakes

Using VStack or ZStack inside HStack incorrectly.

Using Spacer instead of Text for the second label.

Inside an HStack, each child is a view. To add text, use Text.

3fill in blank

hard

Fix the error in the code to overlay two Text views using ZStack.

iOS Swift

ZStack {
    Text("Back")
    [1]("Front")
}

Drag options to blanks, or click blank then click option'

AText

BSpacer

CVStack

DHStack

Attempts:

3 left

💡 Hint

Common Mistakes

Using HStack or VStack inside ZStack incorrectly.

Using Spacer instead of Text.

ZStack overlays views. To add the front text, use Text.

4fill in blank

hard

Fill both blanks to create a VStack containing an HStack and a ZStack.

iOS Swift

VStack {
    [1] {
        Text("Left")
        Text("Right")
    }
    [2] {
        Text("Bottom")
        Text("Top")
    }
}

Drag options to blanks, or click blank then click option'

AHStack

BVStack

CZStack

DSpacer

Attempts:

3 left

💡 Hint

Common Mistakes

Using VStack instead of HStack or ZStack inside VStack.

Using Spacer instead of stack views.

The VStack contains an HStack for horizontal layout and a ZStack for overlay.

5fill in blank

hard

Fill the blanks to create a ZStack with a VStack and an HStack inside.

iOS Swift

ZStack {
    [1] {
        Text("Top")
        Text("Bottom")
    }
    [2] {
        Text("Left")
        Text("Right")
    }
    Text("Center")
}

Drag options to blanks, or click blank then click option'

AVStack

BHStack

CZStack

DSpacer

Attempts:

3 left

💡 Hint

Common Mistakes

Using ZStack inside ZStack unnecessarily.

Confusing the order of VStack and HStack.

The ZStack overlays a VStack, an HStack, and a centered Text.

Practice

1. Which SwiftUI stack arranges views vertically, one on top of the other?
VStack, HStack, or ZStack?

easy

A. ZStack

B. VStack

C. HStack

D. StackView

Solution

1. Step 1: Understand VStack behavior

   VStack arranges child views vertically, stacking them from top to bottom.

2. Step 2: Compare with other stacks

   HStack arranges views horizontally, ZStack layers views on top of each other.

3. Final Answer:

   VStack -> Option B

4. Quick Check:

   Vertical arrangement = VStack [OK]

Hint: Remember V for vertical stacking [OK]

Common Mistakes:

• Confusing HStack with VStack
• Thinking ZStack arranges views vertically
• Assuming StackView is a SwiftUI stack

2. Which of the following is the correct syntax to create a horizontal stack with two Text views in SwiftUI?

?

easy

A. HStack -> Text("Hello") + Text("World")

B. HStack(Text("Hello"), Text("World"))

C. HStack[Text("Hello"), Text("World")]

D. HStack { Text("Hello") Text("World") }

Solution

1. Step 1: Recall SwiftUI stack syntax

   Stacks use braces { } to group child views, separated by spaces or newlines.

2. Step 2: Identify correct syntax

   HStack { Text("Hello") Text("World") } uses braces and places Text views inside correctly. Others use invalid syntax.

3. Final Answer:

   HStack { Text("Hello") Text("World") } -> Option D

4. Quick Check:

   Use braces for stacks [OK]

Hint: Stacks use braces { } to group views [OK]

Common Mistakes:

• Using parentheses instead of braces
• Using brackets instead of braces
• Trying to use operators to combine views

3. What will be the visual arrangement of the texts when this SwiftUI code runs?

ZStack {
  Text("Bottom")
  Text("Top")
}

medium

A. Texts appear side by side horizontally

B. "Bottom" text appears above "Top" text

C. "Top" text appears above "Bottom" text

D. Texts appear stacked vertically

Solution

1. Step 1: Understand ZStack layering order

   ZStack layers views in order, last view is on top visually.

2. Step 2: Apply to given code

   "Bottom" is added first, "Top" second, so "Top" appears above "Bottom".

3. Final Answer:

   "Top" text appears above "Bottom" text -> Option C

4. Quick Check:

   ZStack last view is top layer [OK]

Hint: Last view in ZStack is on top [OK]

Common Mistakes:

• Assuming first view is on top
• Thinking ZStack arranges views horizontally
• Confusing ZStack with VStack or HStack

4. Identify the error in this SwiftUI code snippet:

HStack {
  Text("One")
  VStack
  Text("Two")
}

medium

A. Missing braces after VStack declaration

B. Text views cannot be inside HStack

C. HStack requires parentheses instead of braces

D. VStack cannot be nested inside HStack

Solution

1. Step 1: Check VStack usage

   VStack is a view container and requires braces { } to enclose child views.

2. Step 2: Identify missing braces

   Code shows VStack without braces, causing syntax error.

3. Final Answer:

   Missing braces after VStack declaration -> Option A

4. Quick Check:

   Containers need braces for children [OK]

Hint: Always add braces after VStack or HStack [OK]

Common Mistakes:

• Omitting braces for stack containers
• Thinking Text can't be inside HStack
• Using parentheses instead of braces for stacks

5. You want to create a SwiftUI view where three colored squares overlap each other with red on bottom, green in middle, and blue on top. Which stack and order of views achieves this?

hard

A. ZStack { Color.red Color.green Color.blue } with Color.blue last

B. VStack { Color.red Color.green Color.blue } with Color.red last

C. HStack { Color.blue Color.green Color.red } with Color.red last

D. ZStack { Color.blue Color.green Color.red } with Color.red last

Solution

1. Step 1: Choose stack for overlapping views

   ZStack layers views on top of each other, perfect for overlapping.

2. Step 2: Order views for correct layering

   In ZStack, last view is top layer, so Color.blue last puts blue on top, red first puts red at bottom.

3. Final Answer:

   ZStack { Color.red Color.green Color.blue } with Color.blue last -> Option A

4. Quick Check:

   ZStack layering order = last view on top [OK]

Hint: Use ZStack; last view is top layer [OK]

Common Mistakes:

• Using VStack or HStack for overlapping
• Reversing order of colors in ZStack
• Thinking first view is top layer in ZStack