音源の再生

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Swift 5.x/4.x

//
//  ViewController.swift
//  avfoundation001
//
//  Copyright © 2016年 FaBo, Inc. All rights reserved.
//

import UIKit
import AVFoundation

//AudioPlayerDelegateプロトコルを採用.
class ViewController: UIViewController,AVAudioPlayerDelegate {

    //変数宣言.
    var myAudioPlayer : AVAudioPlayer!
    var myButton : UIButton!

    override func viewDidLoad() {
        super.viewDidLoad()

        //再生する音源のURLを生成.
        let soundFilePath : String = Bundle.main.path(forResource: "Sample", ofType: "mp3")!
        let fileURL = URL(fileURLWithPath: soundFilePath)

        //AVAudioPlayerのインスタンス化.
        myAudioPlayer = try! AVAudioPlayer(contentsOf: fileURL)

        //AVAudioPlayerのデリゲートをセット.
        myAudioPlayer.delegate = self

        //ボタンの生成.
        myButton = UIButton()
        myButton.frame.size = CGSize(width: 100, height: 100)
        myButton.layer.position = CGPoint(x: self.view.frame.width/2, y: self.view.frame.height/2)
        myButton.setTitle("▶︎", for: UIControl.State.normal)
        myButton.setTitleColor(UIColor.black, for: .normal)
        myButton.backgroundColor = UIColor.cyan
        myButton.addTarget(self, action: #selector(onClickMyButton), for: UIControl.Event.touchUpInside)
        myButton.layer.masksToBounds = true
        myButton.layer.cornerRadius = 50.0
        self.view.addSubview(myButton)
    }

    //ボタンがタップされた時に呼ばれるメソッド.
    @objc func onClickMyButton(sender: UIButton) {

        //playingプロパティがtrueであれば音源再生中.
        if myAudioPlayer.isPlaying == true {

            //myAudioPlayerを一時停止.
            myAudioPlayer.pause()
            sender.setTitle("▶︎", for: .normal)
        } else {

            //myAudioPlayerの再生.
            myAudioPlayer.play()
            sender.setTitle("■", for: .normal)
        }
    }

    // MARK: - AVAudioPlayerDelegate

    //音楽再生が成功した時に呼ばれるメソッド.
    func audioPlayerDidFinishPlaying(_ player: AVAudioPlayer, successfully flag: Bool) {
        if !flag { return }

        print("Music Finish")
        //再度myButtonを"▶︎"に設定.
        myButton.setTitle("▶︎", for: .normal)
    }

    //デコード中にエラーが起きた時に呼ばれるメソッド.
    func audioPlayerDecodeErrorDidOccur(_ player: AVAudioPlayer, error: Error?) {
        if let e = error {
            print("Error")
            print(e.localizedDescription)
            return
        }
    }
}

Swift 3.x

//
//  ViewController.swift
//  avfoundation001
//
//  Copyright © 2016年 FaBo, Inc. All rights reserved.
//

import UIKit
import AVFoundation

//AudioPlayerDelegateプロトコルを採用.
class ViewController: UIViewController,AVAudioPlayerDelegate {

    //変数宣言.
    var myAudioPlayer : AVAudioPlayer!
    var myButton : UIButton!

    override func viewDidLoad() {
        super.viewDidLoad()

        //再生する音源のURLを生成.
        let soundFilePath : String = Bundle.main.path(forResource: "Sample", ofType: "mp3")!
        let fileURL = URL(fileURLWithPath: soundFilePath)

        //AVAudioPlayerのインスタンス化.
        myAudioPlayer = try! AVAudioPlayer(contentsOf: fileURL)

        //AVAudioPlayerのデリゲートをセット.
        myAudioPlayer.delegate = self

        //ボタンの生成.
        myButton = UIButton()
        myButton.frame.size = CGSize(width: 100, height: 100)
        myButton.layer.position = CGPoint(x: self.view.frame.width/2, y: self.view.frame.height/2)
        myButton.setTitle("▶︎", for: UIControlState.normal)
        myButton.setTitleColor(UIColor.black, for: .normal)
        myButton.backgroundColor = UIColor.cyan
        myButton.addTarget(self, action: #selector(onClickMyButton), for: UIControlEvents.touchUpInside)
        myButton.layer.masksToBounds = true
        myButton.layer.cornerRadius = 50.0
        self.view.addSubview(myButton)
    }

    //ボタンがタップされた時に呼ばれるメソッド.
    func onClickMyButton(sender: UIButton) {

        //playingプロパティがtrueであれば音源再生中.
        if myAudioPlayer.isPlaying == true {

            //myAudioPlayerを一時停止.
            myAudioPlayer.pause()
            sender.setTitle("▶︎", for: .normal)
        } else {

            //myAudioPlayerの再生.
            myAudioPlayer.play()
            sender.setTitle("■", for: .normal)
        }
    }

    // MARK: - AVAudioPlayerDelegate

    //音楽再生が成功した時に呼ばれるメソッド.
    func audioPlayerDidFinishPlaying(_ player: AVAudioPlayer, successfully flag: Bool) {
        if !flag { return }

        print("Music Finish")
        //再度myButtonを"▶︎"に設定.
        myButton.setTitle("▶︎", for: .normal)
    }

    //デコード中にエラーが起きた時に呼ばれるメソッド.
    func audioPlayerDecodeErrorDidOccur(_ player: AVAudioPlayer, error: Error?) {
        if let e = error {
            print("Error")
            print(e.localizedDescription)
            return
        }
    }
}

Swift 2.3

//
//  ViewController.swift
//  avfoundation001
//
//  Copyright © 2016年 FaBo, Inc. All rights reserved.
//

import UIKit
import AVFoundation

//AudioPlayerDelegateプロトコルを採用.
class ViewController: UIViewController,AVAudioPlayerDelegate {

    //変数宣言.
    var myAudioPlayer : AVAudioPlayer!
    var myButton : UIButton!

    override func viewDidLoad() {
        super.viewDidLoad()


        //再生する音源のURLを生成.
        let soundFilePath : NSString = NSBundle.mainBundle().pathForResource("Sample", ofType: "mp3")!
        let fileURL : NSURL = NSURL(fileURLWithPath: soundFilePath as String)

        //AVAudioPlayerのインスタンス化.
        myAudioPlayer = try! AVAudioPlayer(contentsOfURL: fileURL)

        //AVAudioPlayerのデリゲートをセット.
        myAudioPlayer.delegate = self
        //ボタンの生成.
        myButton = UIButton()
        myButton.frame.size = CGSizeMake(100, 100)
        myButton.layer.position = CGPoint(x: self.view.frame.width/2, y: self.view.frame.height/2)
        myButton.setTitle("▶︎", forState: UIControlState.Normal)
        myButton.setTitleColor(UIColor.blackColor(), forState: .Normal)
        myButton.backgroundColor = UIColor.cyanColor()
        myButton.addTarget(self, action: #selector(ViewController.onClickMyButton(_:)), forControlEvents: UIControlEvents.TouchUpInside)
        myButton.layer.masksToBounds = true
        myButton.layer.cornerRadius = 50.0
        self.view.addSubview(myButton)
    }

    //ボタンがタップされた時に呼ばれるメソッド.
    func onClickMyButton(sender: UIButton) {

        //playingプロパティがtrueであれば音源再生中.
        if myAudioPlayer.playing == true {

            //myAudioPlayerを一時停止.
            myAudioPlayer.pause()
            sender.setTitle("▶︎", forState: .Normal)
        } else {

            //myAudioPlayerの再生.
            myAudioPlayer.play()
            sender.setTitle("■", forState: .Normal)
        }
    }

    // MARK: - AVAudioPlayerDelegate

    //音楽再生が成功した時に呼ばれるメソッド.
    func audioPlayerDidFinishPlaying(player: AVAudioPlayer, successfully flag: Bool) {
        if !flag { return }

        print("Music Finish")
        //再度myButtonを"▶︎"に設定.
        myButton.setTitle("▶︎", forState: .Normal)
    }

    //デコード中にエラーが起きた時に呼ばれるメソッド.
    func audioPlayerDecodeErrorDidOccur(player: AVAudioPlayer, error: NSError?) {
        if let e = error {
            print("Error")
            print(e.localizedDescription)
            return
        }
    }
}

3.xと4.xの差分

UIControlState が UIControl.State に変更
UIControlEvents が UIControl.Event に変更
func onClickMyButton(sender: UIButton) に @objc を追加

2.xと3.xの差分

NSBundleからBundleに変更
- NSBundle.mainBundle().pathForResource(String?, ofType: String?)からBundle.main.path(forResource: String?, ofType: String?)に変更
NSURLからURLに変更
CGSizeMake(CGFloat, CGFloat)からCGSize(width: CGFloat, height: CGFloat)に変更
UIControlState.NormalからUIControlState.normalに変更
UIButton.setTitle(String?, forState: UIControlState)からUIButton.setTitle(String?, for: UIControlState)に変更
UIColorによる色指定の簡略化
- 例 : UIColor.blueColor()からUIColor.blueに変更
UIControlEvents.TouchUpInsideからUIControlEvents.touchUpInsideに変更
AVAudioPlayerのプロパティ名変更
- AVAudioPlayer.isPlaying → AVAudioPlayer.playing
AVAudioPlayerDelegateプロトコルのメソッドのインタフェース変更
- func audioPlayerDidFinishPlaying(player: AVAudioPlayer, successfully flag: Bool)``func audioPlayerDidFinishPlaying(_ player: AVAudioPlayer, successfully flag: Bool)
- func audioPlayerDecodeErrorDidOccur(player: AVAudioPlayer, error: NSError?) → func audioPlayerDecodeErrorDidOccur(_ player: AVAudioPlayer, error: Error?)

Reference

NSBundle
- https://developer.apple.com/reference/foundation/nsbundle
- https://developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Classes/NSBundle_Class/
AV Foundation Framework
- https://developer.apple.com/library/ios/documentation/AVFoundation/Reference/AVFoundationFramework/
AVAudioPlayerDelegate
- https://developer.apple.com/library/ios/documentation/AVFoundation/Reference/AVAudioPlayerDelegateProtocolReference/index.html#//apple_ref/occ/intf/AVAudioPlayerDelegate