Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

iOS Build a Vending Machine App in Swift Displaying Additional Views Comparing Answers

VendingMachineError.invalidSelection - showing alert


I get confused. Where and when I can expect to show alert as a invalidSelection ?? I've tried to click Purchase after app started because there is now selection at the beginning but its not working. Don't know where to look at?

Cheers Kuba