Not able to iterate through SPTPlaylistList items - swift

Question

I am trying to access all the playlists of a Spotify user
let request2: URLRequest = try! SPTPlaylistList.createRequestForGettingPlaylists(forUser: self.username, withAccessToken: accessToken)
print(request2)
SPTRequest.sharedHandler().perform(request2) { (error, response, data) in
if error == nil {
print(response)
let playlists = try! SPTPlaylistList(from: data, with: response)
}else{
print(error)
}
}
And I can see the playlists if I print 'playlists'
some([<SPTPartialPlaylist: 0x10aa854d0>: john mayer [2 tracks] (spotify:user:virajdeshpande88:playlist:3BLBrqb3CURu5KFPqdYqd1), <SPTPartialPlaylist: 0x10aa922a0>: beatles [2 tracks] (spotify:user:virajdeshpande88:playlist:2t6z8KEhZGzY7Tqvy8QoW4)])
But I can't access the playlists individually or iterate through playlists.items. If I do the following:
print (playlists.items[0])
I get 'Unexpectedly found nil while unwrapping an Optional value'.
Update: I tried using playlistsForUser:withAccessToken:callback: and I am able to access all the user's playlists now. But it only seems to work if the following block of code is inside the if {} block of the piece of code I posted above. If this block is placed just by itself, I get the nil value error again.
SPTPlaylistList.playlists(forUser: self.username, withAccessToken: accessToken, callback: {(error, playlist_list) in
if error == nil {
let list = playlist_list as! SPTPlaylistList
print(list.items[0])
print(list.items[1])
let playlist = list.items[0] as! SPTPartialPlaylist
print(playlist.name)
}else{
print("latest error")
}
})

Answer 1

You should avoid using force unwrap !.
if let request2: URLRequest = try? SPTPlaylistList.createRequestForGettingPlaylists(forUser: self.username, withAccessToken: accessToken){
print(request2)
SPTRequest.sharedHandler().perform(request2) { (error, response, data) in
if error == nil {
print(response)
if let playlists = try? SPTPlaylistList(from: data, with: response) {
playlists.forEach{ playlist in
print(playlist)
// do thing with your each playlist
}
}
}else{
print(error)
}
}
}