How to change NSIndexPath in another UIViewController in swift - ios

Question

I get NSIndexPath array from UITableViewController and NSIndexPath of a specific file. I get mp3 files from the document folder in NSIndexPath array and I get a specific file from the selected row from UITableViewCell in a NSIndexPath file.
I want to switch mp3 files for it need change NSIndexPath in UIViewController is which plays music. Or is there different methods are which switching mp3 files from document folder?
The UITableViewController code
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
var playerVC = (segue.destinationViewController as! UINavigationController).topViewController as! PlayMusicViewController
var indexPath = tableView.indexPathForSelectedRow()
var nameOfObjectForPass = listOfMP3Files![indexPath!.row] // default it's name and
var fileManager = NSFileManager.defaultManager()
var wayToFile = fileManager.URLsForDirectory(NSSearchPathDirectory.DocumentDirectory, inDomains: NSSearchPathDomainMask.UserDomainMask)
var passMusicFileURL: NSURL? // for pass mp3
if let documentPath: NSURL = wayToFile.first as? NSURL {
let musicFile = documentPath.URLByAppendingPathComponent(nameOfObjectForPass)
println(musicFile)
passMusicFileURL = musicFile
}
var currentTrackIndex = tableView.indexPathForSelectedRow()!
var allIndexTable = tableView.indexPathsForVisibleRows()! as! [NSIndexPath]
if segue.identifier == "listenMusic" {
playerVC.nameMusicFile = nameOfObjectForPass // name
playerVC.mp3URL = passMusicFileURL
// test
playerVC.currentIndex = currentTrackIndex
playerVC.allIndex = allIndexTable
}
}
The UIViewController code
var currentIndex: NSIndexPath!
var allIndex = [AnyObject]() as! [NSIndexPath]
func playNextSound() {
println("index \(currentIndex)")
println("all object \(allIndex)")
var indextFound = find(allIndex, currentIndex)
println("index found \(indextFound)")
}
The code is which plays music
func playMusic() {
AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback, error: nil) // == true
AVAudioSession.sharedInstance().setActive(true, error: nil)
var error: NSError?
audioPlayer = AVAudioPlayer(contentsOfURL: mp3URL, error: &error)
// audioPlayer.prepareToPlay()
if currentPause == nil {
} else {
audioPlayer.currentTime = currentPause
}
//
audioPlayer.volume = 0.5
audioPlayer.play()
}
I get following results in the console
index {length = 2, path = 0 - 0} it is current object
it is all object from document folder
all object [ {length = 2, path = 0 - 0}, {length = 2, path = 0 - 1}]

Answer 1

var newURL: NSURL!
#IBAction func nextTrack(sender: UIButton) {
println("touched next")
var nowRow: Int = self.currentRow
var maxCount = self.arrayOfMP3.count-1 // -1
if nowRow < maxCount {
nowRow = self.currentRow++
println("plus")
} else if nowRow == arrayOfMP3.endIndex {
nowRow = maxCount
println("equals")
}
// for play/pause button setting
currentPause = nil
//println("current pause\(currentPause)")
next = false
//
println("current row \(currentRow)")
println("end index \(arrayOfMP3.endIndex)")
var nextTrack = arrayOfMP3![nowRow]
var nextDirectory = fileManager.URLsForDirectory(NSSearchPathDirectory.DocumentDirectory, inDomains: NSSearchPathDomainMask.UserDomainMask)
if var nextURL: NSURL = nextDirectory.first as? NSURL {
newURL = nextURL.URLByAppendingPathComponent(nextTrack)
}
var nameArtist: String!
var nameSong: String!
var imageString: NSData!
var itemPlayer = AVPlayerItem(URL: newURL)
var listMetaData = itemPlayer.asset.commonMetadata as! [AVMetadataItem]
for item in listMetaData {
if item.commonKey == "title" {
nameSong = item.stringValue
}
if item.commonKey == "artist" {
nameArtist = item.stringValue
}
if item.commonKey == "album" {
item.stringValue
}
if item.commonKey == "artwork" {
imageString = item.dataValue
}
}
nameLabel?.text = "\(nameArtist) \(nameSong)"
if imageString != nil {
imageView?.image = UIImage(data: imageString)
} else {
imageView?.image = nil
}
tapButtonPlay = false
playMusic()
}