currently, I try make an music playlist application. I try to save and retrieve playlist data from NSUserDefaults. I have no problem when saving the data but I got an error when retrieving data.
I got:
Terminating app due to uncaught exception 'MPMediaItemCollectionInitException', reason: '-init is not supported, use -initWithItems:
I'm following the answer from Play iPod playlist retrieved from a saved persistentid list but I try to write it in swift.
here is my save function:
func savePlaylist(var mediaItemCollection: MPMediaItemCollection){
var items: NSArray = mediaItemCollection.items
var listToSave: NSMutableArray = NSMutableArray()
for 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 is my 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 as [AnyObject])
var allTheSongs: NSMutableArray = NSMutableArray()
for var i = 0; i < 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 I fix it?
Here is the issue
var currentQueue: MPMediaItemCollection = MPMediaItemCollection()
You must
init
with itemsAs per the documentation by apple.
You have to init with items like