Passing data to destination in iOS Swift - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a variable to hold data to pass.

iOS Swift

var message[1] String?

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A?

B:

C=

D!

Attempts:

3 left

💡 Hint

Common Mistakes

Using '=' instead of ':' when declaring a variable type.

Using '!' or '?' incorrectly here.

In Swift, to declare a variable with a type, use a colon : after the variable name.

2fill in blank

medium

Complete the code to override the prepare method for passing data.

iOS Swift

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "showDetail" {
        let destination = segue.[1] as! DetailViewController
    }
}

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

Adestination

BdestinationVC

CdestinationViewController

DdestinationView

Attempts:

3 left

💡 Hint

Common Mistakes

Using a wrong property name like 'destinationVC' or 'destinationView'.

Forgetting to cast to the correct controller type.

The correct property to get the destination view controller from a segue is destination.

3fill in blank

hard

Fix the error in passing data to the destination view controller.

iOS Swift

destination.message = [1]

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Aself.message

Bself.message()

C"message"

Dmessage

Attempts:

3 left

💡 Hint

Common Mistakes

Using quotes which assign a string literal instead of the variable value.

Calling the variable like a function with parentheses.

You assign the variable message directly without self. or parentheses.

4fill in blank

hard

Fill both blanks to safely unwrap and pass data in prepare method.

iOS Swift

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if let destination = segue.[1] as? DetailViewController, let data = [2] {
        destination.message = data
    }
}

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

AdestinationViewController

Bself.message

Cmessage

Dsender

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'sender' instead of the data variable.

Using forced cast instead of optional cast.

Use destination to get the destination safely and unwrap the message variable.

5fill in blank

hard

Fill all three blanks to create a dictionary and pass filtered data to destination.

iOS Swift

let filteredData = data.filter { $0.[1] [2] [3] }
destination.filteredItems = filteredData

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

Acount

B>

C5

Dlength

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'length' which is not a Swift property.

Using '<' instead of '>' causing wrong filtering.

Use count to get the length of each item, filter those with count greater than 5.