swift2 - Error with Swift 2: Cannot assign a value of type '[NSURL]' to a value of type '[NSURL]' -

i have variable named downloadedphotourls of type [nsurl]?.

i'm trying assign results of function returns type [nsurl] (non optional).

i unwrap variable downloadedphotourls! when assigning.

i error:

cannot assign value of type '[nsurl]' value of type '[nsurl]'

i don't see how fix this.

i'm using xcode 7 beta (only because have able run on device have free account)

do {     downloadedphotourls! = try nsfilemanager.defaultmanager().contentsofdirectoryaturl(directoryurl, includingpropertiesforkeys: nil, options: nil)     collectionview!.reloaddata() } catch _ {     downloadedphotourls = nil } 

two problems there ...

force unwrapping downloadedphotourls!

you can't assign in way. if variable type optional, you're assigning in common way, if isn't optional, ...

downloadedphotourls = ... 

unwrapping (!, ...) used when want read / access value. not when want assign new value. did correctly on line:

downloadedphotourls = nil 

optionsettype in swift 2.0

you can't pass nil in options: argument. signature of methos is:

func contentsofdirectoryaturl(url: nsurl,   includingpropertiesforkeys keys: [string]?,   options mask: nsdirectoryenumerationoptions) throws -> [nsurl] 

and nsdirectoryenumerationoptions is:

struct nsdirectoryenumerationoptions : optionsettype {     init(rawvalue: uint)      static var skipssubdirectorydescendants: nsdirectoryenumerationoptions { }         static var skipspackagedescendants: nsdirectoryenumerationoptions { }        static var skipshiddenfiles: nsdirectoryenumerationoptions { } } 

so should like:

downloadedphotourls = try nsfilemanager.defaultmanager().contentsofdirectoryaturl(nsurl(string: "")!,   includingpropertiesforkeys: nil,   options:nsdirectoryenumerationoptions(rawvalue: 0)) 

more info optionsettype (introduced swift 2.0).