ios - How to retrieve data from NSUserDefaults? -


currently, try make music playlist application. try save , retrieve playlist data nsuserdefaults. have no problem when saving data got error when retrieving data.

i got:

terminating app due uncaught exception 'mpmediaitemcollectioninitexception', reason: '-init not supported, use -initwithitems:

i'm following answer play ipod playlist retrieved saved persistentid list try write in swift.

here save function:

func saveplaylist(var mediaitemcollection: mpmediaitemcollection){      var items: nsarray = mediaitemcollection.items      var listtosave: nsmutablearray = nsmutablearray()      song in items{          var persistentid: anyobject! = song.valueforproperty(mpmediaitempropertypersistentid)          listtosave.addobject(persistentid)      }      var data: nsdata = nskeyedarchiver.archiveddatawithrootobject(listtosave)      nsuserdefaults.standarduserdefaults().setobject(data, forkey: "songslist")     nsuserdefaults.standarduserdefaults().synchronize()  }

and here retrieve function:

func setupmusic(){      if nsuserdefaults.standarduserdefaults().objectforkey("songslist") != nil{          var thelist: nsmutablearray = nsmutablearray()          var data: nsdata = (nsuserdefaults.standarduserdefaults().objectforkey("songslist") as? nsdata)!          var decodeddata: nsarray  = (nskeyedunarchiver.unarchiveobjectwithdata(data) as? nsarray)!          thelist.addobjectsfromarray(decodeddata [anyobject])          var allthesongs: nsmutablearray = nsmutablearray()          var = 0; < thelist.count; i++ {              var songquery = mpmediaquery.songsquery()              var songs: nsarray = songquery.items              allthesongs.addobject(songs)          }          var currentqueue: mpmediaitemcollection = mpmediaitemcollection()          mymusicplayer?.setqueuewithitemcollection(currentqueue)       }else{         println("fail!!!!!!!!!!!!")     }  }

how can fix it?

here issue var currentqueue: mpmediaitemcollection = mpmediaitemcollection()

you must init items

as per documentation apple.

init(items:) designated initializer

initializes media item collection array of media items. declaration

swift

init!(items items: [anyobject]!) parameters items

the array of items assigning media item collection.

you have init items 

var currentqueue: mpmediaitemcollection = mpmediaitemcollection(items:itemsarray)

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