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


Gleb Linnik
Gleb Linnik
Courses Plus Student 2,558 Points

CALayer property

I want to create a CALayer property inside my ViewController class, but when I type like:

var shadowButton =  factsButton.layer

it gives me an error: 'ViewController.Type' does not have a member named 'factsButton', and I have to use the computed property here:

var shadowButton: CALayer {
        return factsButton.layer

Why do I have to use computed property here?