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 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