Set Multiple Arrow Directions on UIPopoverController in Swift

问题

What is the syntax to set multiple arrow directions for a UIPopoverController in Swift?

Something like this:

popoverController.permittedArrowDirections = .Up | .Down

回答1:

I believe in swift the syntax you're looking for is:

popoverController.permittedArrowDirections = [.up, .down]

来源：https://stackoverflow.com/questions/34052471/set-multiple-arrow-directions-on-uipopovercontroller-in-swift