当我播放录制的音频时，出现以下错误：
致命错误：在解包可选值时意外地发现了nil
该错误位于以下代码行:
SoundPlayer = try AVAudioPlayer(contentsOfURL: getFileURL())
除了真实设备，模拟器上它表现得完美无缺。
ViewController.Swift:
import UIKit
import AVFoundation
class ViewController: UIViewController, AVAudioPlayerDelegate, AVAudioRecorderDelegate {
@IBOutlet var PlayBTN: UIButton!
@IBOutlet var RecordBTN: UIButton!
var soundRecorder : AVAudioRecorder!
var SoundPlayer : AVAudioPlayer!
var fileName = "audioFile.m4a"
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
setupRecorder()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func setupRecorder(){
let recordSettings = [AVSampleRateKey : NSNumber(float: Float(44100.0)),
AVFormatIDKey : NSNumber(int: Int32(kAudioFormatMPEG4AAC)),
AVNumberOfChannelsKey : NSNumber(int: 1),
AVEncoderAudioQualityKey : NSNumber(int: Int32(AVAudioQuality.Max.rawValue))]
do{
try soundRecorder = AVAudioRecorder(URL: getFileURL(), settings: recordSettings)
soundRecorder.delegate = self
soundRecorder.prepareToRecord()
}
catch let error as NSError {
error.description
}
}
func getCacheDirectory() -> String {
let paths = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true)
return paths[0]
}
func getFileURL() -> NSURL{
let path = (getCacheDirectory() as NSString).stringByAppendingPathComponent(fileName)
let filePath = NSURL(fileURLWithPath: path)
return filePath
}
@IBAction func Record(sender: UIButton) {
if sender.titleLabel?.text == "Record"{
soundRecorder.record()
sender.setTitle("Stop", forState: .Normal)
PlayBTN.enabled = false
}
else{
soundRecorder.stop()
sender.setTitle("Record", forState: .Normal)
PlayBTN.enabled = false
}
}
@IBAction func PlaySound(sender: UIButton) {
if sender.titleLabel?.text == "Play" {
RecordBTN.enabled = false
sender.setTitle("Stop", forState: .Normal)
preparePlayer()
SoundPlayer.play()
}
else{
SoundPlayer.stop()
sender.setTitle("Play", forState: .Normal)
}
}
func preparePlayer(){
do{
SoundPlayer = try AVAudioPlayer(contentsOfURL: getFileURL())
SoundPlayer.delegate = self
SoundPlayer.volume = 1.0
SoundPlayer.prepareToPlay()
}
catch let error as NSError {
error.description
}
}
func audioRecorderDidFinishRecording(recorder: AVAudioRecorder, successfully flag: Bool) {
PlayBTN.enabled = true
}
func audioPlayerDidFinishPlaying(player: AVAudioPlayer, successfully flag: Bool) {
RecordBTN.enabled = true
PlayBTN.setTitle("Play", forState: .Normal)
}
@IBAction func actDone(sender: AnyObject) {
//viewRecorder.hidden = true
let fm = NSFileManager.defaultManager()
let documentsDirectory = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0] as String
do {
let items = try fm.contentsOfDirectoryAtPath(documentsDirectory)
for item in items {
print(item)
}
}
catch let error as NSError {
error.description
}
}
}
ViewController.Swift的故事板文件:
附加信息:
- Xcode版本：7.2.1
- 设备：iPhone 5s
- iOS版本：9.2.1
注意：我已经寻找了类似的SO解决方案，但它们都没有帮助到我。其中一些是由于较旧的Swift版本和已弃用的方法。一些解决方案涉及从应用程序包中播放音频文件，而另一些则使用Web URL。因此，这种情况是不同的（真实设备与模拟器）。
这是源代码的链接，存储在Google Drive上。