UserDefaults for simple values in iOS Swift - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to save a string value to UserDefaults.

iOS Swift

UserDefaults.standard.set("Hello", forKey: [1])

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

A"save"

B"greeting"

C"key"

D"value"

Attempts:

3 left

💡 Hint

Common Mistakes

Using a key that is not a string.

Forgetting to put quotes around the key.

The key "greeting" is used to store the string "Hello" in UserDefaults.

2fill in blank

medium

Complete the code to retrieve a string value from UserDefaults.

iOS Swift

let message = UserDefaults.standard.string(forKey: [1])

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

A"text"

B"message"

C"greeting"

D"note"

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different key than the one used to save the value.

Forgetting to use quotes around the key.

The key "greeting" matches the key used to save the string, so it retrieves the correct value.

3fill in blank

hard

Fix the error in the code to save an integer value to UserDefaults.

iOS Swift

UserDefaults.standard.[1](25, forKey: "age")

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

Aset

Bstore

Cput

Dsave

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect method names like 'save' or 'put'.

Forgetting to use the correct method causes runtime errors.

The correct method to save a value in UserDefaults is 'set'.

4fill in blank

hard

Fill both blanks to save and retrieve a boolean value using UserDefaults.

iOS Swift

UserDefaults.standard.[1](true, forKey: "isLoggedIn")
let loggedIn = UserDefaults.standard.[2](forKey: "isLoggedIn")

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

Aset

Bbool

Cget

Dvalue

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'get' instead of 'bool' to retrieve a boolean.

Using wrong method names causing errors.

Use 'set' to save the boolean and 'bool(forKey:)' to retrieve it from UserDefaults.

5fill in blank

hard

Fill all three blanks to save a double value and then retrieve it from UserDefaults.

iOS Swift

UserDefaults.standard.[1](9.99, forKey: "price")
let price = UserDefaults.standard.[2](forKey: [3])

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

Aset

Bdouble

C"price"

Dfloat

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'float' instead of 'double' to retrieve a double value.

Using different keys for saving and retrieving.

Use 'set' to save the double, 'double' to retrieve it, and the key must be "price".