Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

iOS Build a Playlist Browser with Swift Building the Music Library and Playlist Models Creating UIImageView instances

Jaron Trotter
Jaron Trotter
11,472 Points

Using a playlist instance challenge, I'm stuck..

Challenge Task 1 of 1

In our Treehouse model struct below we have a property named friends. It is a dictionary that holds information about our friends including their profile pictures. In the ViewController class, using the key profilePicture, retrieve the image name as a string from the dictionary and assign it to a constant named profileImageName. Iโ€™ve already created an instance of the Treehouse struct and stored a reference to the friends library in a constant named friends for you to use.

Once you have the image name, create an instance of UIImage using the image name and store it in a constant called profilePicture.

Guidance please. I'll be doing the video over, I also want some help?

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {

        let friends = Treehouse().friends

        //Add your code below


struct Treehouse {
    let friends = [
        "firstName": "Susan",
        "lastName": "Olson",
        "profilePicture": "susan_profile.png"

1 Answer

Anjali Pasupathy
Anjali Pasupathy
28,883 Points

friends is currently a [String:String] dictionary that contains the key "profilePicture". This is the key the challenge asks you to access. It's important to note that when you access any value from a dictionary using a key, the value returned is an Optional value; because of this, you'll have to unwrap it with a bang (!). You're required to store the value that corresponds to the "profilePicture" key in a constant named profileImageName.

After this, the challenge asks you to create a new UIImage using profileImageName, and store that image as a constant called profilePicture. If you check the documentation for UIImage, you'll find that UIImage has an init method that takes in a single parameter of type String called named. This is the init method you should be using to instantiate profilePicture.

I hope this helps!