Inheriting Multiple Classes in F#

Question

I have the following class definition in Swift:

class LandlordHome : UIViewController, UICollectionViewDelegate, UICollectionViewDataSource {

}

I'm trying to create it in F#, however the inheritance pattern in F# only allows me to inherit one class like this:

[<Register ("LandlordHome")>]
type LandlordHome (handle:IntPtr) =
inherit UIViewController (handle)

If I try to add additional classes like this:

[<Register ("LandlordHome")>]
type LandlordHome (handle:IntPtr) =
inherit UIViewController, UICollectionViewDelegate, UICollectionViewDataSource (handle)

this throws an error.

Answer 1

UICollectionViewDelegate and UICollectionViewDataSource are not classes, but protocols, which are like interfaces in F#

So your could should look something like this (abstract code):

[<Register ("LandlordHome")>]
type LandlordHome (handle:IntPtr) =
    inherit UIViewController (handle)
    interface UICollectionViewDelegate with
       // implementation of UICollectionViewDelegate
    interface UICollectionViewDataSource with
       // implementation of UICollectionViewDataSource