susanstevens

extension Array {
    
    /**
     Returns all possible combinations of `k` elements
     - Parameter k: The size of the combinations to generate
     - Returns: All possible combinations of `k` elements
     */
    func combinations(k: Int) -> [[Element]] {
        guard self.count > 0 && self.count >= k else { return [] }
        

susanstevens

How to Create a Popover on iPhone

Storyboard set up

Add your view controllers in storyboard. In the Size Inspector, change the simulated size of the popover view controller to "Freeform". This doesn't change the popover's size when you run the app, but it does make it easier to lay out subviews correctly.

When adding the segue between view controllers, select "Present as Popover".