如何从 swift 中的文档目录获取特定文件的 NSURL

Question

我在 NSFileManager 的帮助下从文档目录获取文件。我得到了一组文件名，我可以将它们传递给另一个控制器。当我传递这些文件的名称时，我仍然想从我的 UITableViewCell 传递特定文件的 NSURL 。我的文件是mp3。请帮助我。

 var listOfMP3Files: Array<String!>? // for Cell data

    func fetchFilesFromFolder() {
        var fileManager = NSFileManager.defaultManager()

        var folderPathURL = fileManager.URLsForDirectory(NSSearchPathDirectory.DocumentDirectory, inDomains: NSSearchPathDomainMask.UserDomainMask)[0] as! NSURL

        var documentsContent = fileManager.contentsOfDirectoryAtPath(folderPathURL.path!, error: nil)
        println(documentsContent)

        if var directoryURLs = fileManager.contentsOfDirectoryAtURL(folderPathURL, includingPropertiesForKeys: nil, options: NSDirectoryEnumerationOptions.SkipsHiddenFiles, error: nil) {
            println(directoryURLs)

            var mp3Files = directoryURLs.map(){ [=11=].lastPathComponent }.filter(){ [=11=].pathExtension == "mp3" }

            listOfMP3Files = mp3Files
            println(mp3Files)
        }
    }

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    var playerVC = (segue.destinationViewController as! UINavigationController).topViewController as! AVPlayerVC
    var indexPath = tableView.indexPathForSelectedRow()
    var objectForPass = listOfMP3Files![indexPath!.row] // default
    if segue.identifier == "listenMusic" {
        playerVC.object = objectForPass 
    }
}

更新:

我更新了我的代码，我可以获取jpg类型的文件。但是我不知道如何获取mp3文件。

我更新的代码

    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    var playerVC = (segue.destinationViewController as! UINavigationController).topViewController as! PlayMusicViewController
    var indexPath = tableView.indexPathForSelectedRow()
    var objectForPass = listOfMP3Files![indexPath!.row] // default
    //

    var path = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true)[0] as? String
    var getImage = path?.stringByAppendingPathComponent(objectForPass)
    var image = UIImage(contentsOfFile: getImage!)

    if segue.identifier == "listenMusic" {
        playerVC.musicFile = objectForPass
        playerVC.end = image 
    }
}

更新2 我编辑了我的代码，我可以在 mp3 文件上传递 NSURL，在另一个 UIViewController 中我可以播放它们。

下面是修改后的代码

  override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        var playerVC = (segue.destinationViewController as! UINavigationController).topViewController as! PlayMusicViewController
        var indexPath = tableView.indexPathForSelectedRow()
        var objectForPass = listOfMP3Files![indexPath!.row] // default
        //

      /*  var path = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true)[0] as? String
        var getImage = path?.stringByAppendingPathComponent(objectForPass)
        var image = UIImage(contentsOfFile: getImage!) */
        //
        var fileM = NSFileManager.defaultManager()

        var wayToFile = fileM.URLsForDirectory(NSSearchPathDirectory.DocumentDirectory, inDomains: NSSearchPathDomainMask.UserDomainMask)
        var passMusicFileURL: NSURL?

        if let documentPath: NSURL = wayToFile.first as? NSURL {
            let musicFile = documentPath.URLByAppendingPathComponent(objectForPass)
            println(musicFile)
            passMusicFileURL = musicFile
        }
        if segue.identifier == "listenMusic" {
           // playerVC.musicFile = objectForPass
            playerVC.end = passMusicFileURL
        }
    }

Answer 1

在单独的中间语句中创建完整文件URL，您会发现问题所在。

如果没有独立的语句调试是非常困难的。

folderPathURL.path 不正确。

首先创建整个文件路径，然后从中创建 f 文件 URL。

示例：

let name = "aFileName"
var filePath = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true).first as! String
println("\nfilePath: \(filePath)")

filePath = filePath.stringByAppendingPathComponent(name)
println("\nfilePath: \(filePath)")

var filePathURL = NSURL.fileURLWithPath(filePath)
println("\nfilePathURL: \(filePathURL!)")

输出：

filePath: /Users/zaph/Library/Developer/CoreSimulator/Devices/264B31F6-3A28-4C75-9205-3558BBF54DED/data/Containers/Data/Application/0048403F-C8DE-4EE7-83CF-6AE7CCBAF090/Documents

filePath: /Users/zaph/Library/Developer/CoreSimulator/Devices/264B31F6-3A28-4C75-9205-3558BBF54DED/data/Containers/Data/Application/0048403F-C8DE-4EE7-83CF-6AE7CCBAF090/Documents/aFileName

filePathURL: file:///Users/zaph/Library/Developer/CoreSimulator/Devices/264B31F6-3A28-4C75-9205-3558BBF54DED/data/Containers/Data/Application/0048403F-C8DE-4EE7-83CF-6AE7CCBAF090/Documents/aFileName

使用中间语句可以验证每个步骤。

Answer 2

我找到了我的问题的解决方案

  override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    var playerVC = (segue.destinationViewController as! UINavigationController).topViewController as! PlayMusicViewController
    var indexPath = tableView.indexPathForSelectedRow()
    var objectForPass = listOfMP3Files![indexPath!.row] // default
    //

  /*  var path = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true)[0] as? String
    var getImage = path?.stringByAppendingPathComponent(objectForPass)
    var image = UIImage(contentsOfFile: getImage!) */
    //
    var fileM = NSFileManager.defaultManager()

    var wayToFile = fileM.URLsForDirectory(NSSearchPathDirectory.DocumentDirectory, inDomains: NSSearchPathDomainMask.UserDomainMask)
    var passMusicFileURL: NSURL?

    if let documentPath: NSURL = wayToFile.first as? NSURL {
        let musicFile = documentPath.URLByAppendingPathComponent(objectForPass)
        println(musicFile)
        passMusicFileURL = musicFile
    }
    if segue.identifier == "listenMusic" {
       // playerVC.musicFile = objectForPass
        playerVC.end = passMusicFileURL
    }
}

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