AVAudioEnginを使って音声をファイルに保存と再生するプログラムを作ってみましたが、1回目が再生できません。2回目からは録音－再生はできるようになりました。  
どうしてなのかwebを漁ってみましたがどうにもわかりません。  
Frameworkもswiftも基本的な理解ができてなく。そんな状況で質問とは心苦しいのですが、どうすれば1回目から再生できるかアドバイスをよろしくお願いします。

```

    import UIKit
    import AVFoundation
    
    class ViewController: UIViewController,AVAudioPlayerDelegate {
    var recBtn: UIButton!
    var playBtn: UIButton!
    var file:   AVAudioFile?
    var player = AVAudioPlayerNode()
    var path: String!
    var engine:AVAudioEngine!
    var mixer:AVAudioMixerNode!
    var input:AVAudioInputNode!
    var audioFile:AVAudioFile!
    
    var audioRecorder:AVAudioRecorder!
    var audioPlayer:AVAudioPlayer!
    var filePath:NSURL! 
    let settings = [
        AVFormatIDKey: kAudioFormatLinearPCM,
        AVSampleRateKey: 44100.0,
        AVNumberOfChannelsKey: 1 ]  
    
    override func viewDidLoad() {
        super.viewDidLoad()
    
        recBtn =  UIButton(frame: CGRectMake( 0, 0, 100, 40))
        recBtn.setTitle("RECORD", forState: UIControlState.Normal)
        recBtn.setTitleColor(UIColor.blackColor(), forState:.Normal)
        recBtn.center = CGPointMake(self.view.bounds.width/2, 200)
        recBtn.backgroundColor=UIColor.lightGrayColor()
        self.view.addSubview(recBtn)
    
        playBtn = UIButton(frame: CGRectMake( 0, 0, 100, 40))
        playBtn.setTitle("PLAY", forState: UIControlState.Normal)
        playBtn.setTitleColor(UIColor.blackColor(), forState:.Normal)
        playBtn.center = CGPointMake(self.view.bounds.width/2, 300)
        playBtn.backgroundColor=UIColor.lightGrayColor()
        self.view.addSubview(playBtn)
    
        recBtn.addTarget(self, action: "recbtn", forControlEvents:UIControlEvents.TouchDown)
        recBtn.addTarget(self, action: "recbtnRelease", forControlEvents:UIControlEvents.TouchUpInside)
        playBtn.addTarget(self, action: "pplay", forControlEvents:UIControlEvents.TouchDown)
        playBtn.addTarget(self, action: "play", forControlEvents:UIControlEvents.TouchUpInside)
    
        initEngine()
    }
    
    func initEngine(){
        filePath = URLFor("testrecord.wav")
        engine = AVAudioEngine()
        input = engine.inputNode
        mixer = engine.mainMixerNode
        mixer.outputVolume = 1.0
    }
    
    func URLFor(filename: String) -> NSURL? {
        if let dirs : [String] = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.AllDomainsMask, true) as? [String] {
            let dir = dirs[0]
            path = dir.stringByAppendingPathComponent(filename)
    
            println(path)
            return NSURL(fileURLWithPath: path)
        }
        return nil
    }
    
    func recbtn() {
        recBtn.backgroundColor=UIColor.redColor()
        var iformat = engine.inputNode.inputFormatForBus(0)
        engine.connect(input, to: mixer, format: iformat)
        engine.startAndReturnError(nil)
    
        audioFile = AVAudioFile(forWriting: filePath, settings: settings as [NSObject : AnyObject], error: nil)
    
        let Input = engine.inputNode
        Input.installTapOnBus(0, bufferSize: 4096, format: audioFile.processingFormat) {
            (buffer : AVAudioPCMBuffer!, when : AVAudioTime!) in
            self.audioFile.writeFromBuffer(buffer, error: nil)
        }
    }
    
    func recbtnRelease() {
        recBtn.backgroundColor=UIColor.lightGrayColor()
        var error: NSError?
        println("recbuttonReleaqse")
        engine.stop()
        engine.inputNode.removeTapOnBus(0)
    
        if let attr: NSDictionary = NSFileManager.defaultManager().attributesOfItemAtPath(path!, error: &error) {
            println(attr.fileModificationDate())
            println(attr.fileSize())
        }else{
            println("DAME")
        }
    }
    
    func pplay(){
        playBtn.backgroundColor=UIColor.redColor()
    }
    
    func play() {
        playBtn.backgroundColor=UIColor.lightGrayColor()
    
        var attr: NSDictionary
        var error: NSError?
    
        if let attr: NSDictionary = NSFileManager.defaultManager().attributesOfItemAtPath(path!, error: &error) {
            println(attr.fileModificationDate())
            println(attr.fileSize())
        }else{
            println("error \(error!.localizedDescription)")
        }
        audioPlayer = AVAudioPlayer(contentsOfURL:filePath,error: nil)
        audioPlayer.delegate = self
        audioPlayer.prepareToPlay()
        audioPlayer.play()
    }
    }
    
```
CC BY-SA 3.0
2015-07-21T10:24:36.187
12533
2016-10-29T09:11:36.120
10616
question
ios swift
AVAudioEngineで保存したファイル。1回目が再生できない
engine.inputNode.removeTapOnBus(0)  
の後に  
self.audioFile = nil  
を入れてはどうでしょう。
CC BY-SA 3.0
2015-10-10T16:02:45.593
17511
2015-10-10T16:02:45.593
8601
12533
answer