I am working on my first Today Centre widget, which simply consists of three labels on the default storyboard. It's working fine, but I read in the [iOS Human Interface Guidelines](https://developer.apple.com/library/ios/documentation/UserExperience/Conceptual/MobileHIG/AppExtensions.html#//apple_ref/doc/uid/TP40006556-CH67-SW4) that secondary text should "use the system-provided vibrant appearance" with `notificationCenterVibrancyEffect`.

What's the correct way to add this vibrancy effect to my two secondary labels? I've read about `UIVisualEffectView`, but it's still not clear to me how to use it for this purpose. I don't think I want to put a blurred view behind my labels because Notification Centre already blurs the background.