iOS Swift 3&4 简单易懂的Recipes系列 - 使用AVFoundation的AVAudioPlayer播放本地音频文件

Note from Apple:

AVAudioPlayer

An instance of the AVAudioPlayer class, called an audio player, provides playback of audio data from a file or memory.
Apple recommends that you use this class for audio playback unless you are playing audio captured from a network stream or require very low I/O latency.

简单翻译过来就是：

1. 用于播放本地音频
2. 不推荐用于播放网络音频
3. 要求超低延迟时不推荐使用

更多详情见：帮助文档 From Apple

Recipe：

---

//第一步：导入AVFoundation

import UIKit
import AVFoundation

//第二步：添加AVAudioPlayerDelegate到UIViewController class

class UIViewController : UIViewController, AVAudioPlayerDelegate {

}

//第三步：创建audioPlayer container（variable）

    var audioPlayer : AVAudioPlayer!

//第四步：创建音频的URL

    let soundURL = Bundle.main.url(forResource: "音频名字", withExtension: "音频格式 e.g. mp3")

//第五步：使用do{try} catch{}来让 audioPlayer 使用刚刚创建的URL

• 因为AVAudioPlayer在读取URL会throw errors所以要用这个形式来把可能会出现的error用catch抓住

    do {
    audioPlayer = try AVAudioPlayer(contentsOf: soundURL!)
    }
    catch {
    print(error)
    }

• 如果100%确定本地的音频文件一定不会有问题，可以不使用do{try} catch{}这个形式，直接在try后面加!来达到同样的效果，如：audioPlayer = try! AVAudioPlayer(contentsOf: soundURL!)

//第六步：调用play()来播放音频

    audioPlayer.play()

Example：

import UIKit
import AVFoundation

class ViewController: UIViewController, AVAudioPlayerDelegate {

    var audioPlayer : AVAudioPlayer!
   
    override func viewDidLoad() {
        super.viewDidLoad()
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }

    @IBAction func buttonTapped(_ sender: UIButton) {
        playSound(soundFileName : "喵", soundExtension: "m4a")
    }

    func playSound(soundFileName : String, soundExtension: String) {

        let soundURL = Bundle.main.url(forResource: soundFileName, withExtension: soundExtension)
        
        do {
            audioPlayer = try AVAudioPlayer(contentsOf: soundURL!)
        } catch {
            print(error)
        }
        audioPlayer.play()
    }
}

参考Demo：PlaySound Demo on GitHub
（Demo内所有素材版权归@lovelyhelenzhu所有，禁止一切二次修改、转载etc. 谢谢配合~）