swift avplayer 参数 swift播放音频

前言：

iOS里面导入AVFoundation包进行音频使用管理，调用AVAudioPlayer对象进行音频操作。这里有个小方法，直接粘贴即可使用。

调用方法：

private func playAudio(forResource: String, ofType: String){
        if let bundlePath = Bundle.main.path(forResource: forResource, ofType: ofType) {
        let url = URL.init(fileURLWithPath: bundlePath)
        do {
            try audioPlayer = AVAudioPlayer(contentsOf: url)
            audioPlayer.delegate = self
            audioPlayer.prepareToPlay()
        } catch let error as NSError {
        print("audioPlayer error \(error.localizedDescription)")
        }
            
        }
    }

说明：在哪个监听或viewDidLoad()方法里面加载就行了。第一个参数为要播放的音频文件名，第二个是音频文件类型。例如这里有一首名为"Lover.mp3"的音乐。调用方法写为playAudio(forResource: "Lover", ofType: "mp3")即可。
另外，调用该方法的前提是先创建好AVAudioPlayer对象，实现AVAudioPlayerDelegate协议，并且已经设置delegate。

全部代码：

import UIKit
import AVFoundation

class ViewController: UIViewController, AVAudioPlayerDelegate{
    
    var audioPlayer: AVAudioPlayer = AVAudioPlayer();
    
    private func playAudio(forResource: String, ofType: String){
        if let bundlePath = Bundle.main.path(forResource: forResource, ofType: ofType) {
        let url = URL.init(fileURLWithPath: bundlePath)
        do {
            try audioPlayer = AVAudioPlayer(contentsOf: url)
            audioPlayer.delegate = self
            audioPlayer.prepareToPlay()
        } catch let error as NSError {
        print("audioPlayer error \(error.localizedDescription)")
        }
            
        }
    }

    @IBAction func oneListener(_ sender: Any) {
        // Play the audio instance.
        self.audioPlayer.play()
    }
    
    @IBAction func twoListener(_ sender: Any) {
        // Pause the audio instance that playing.
        self.audioPlayer.pause()
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        
        playAudio(forResource: "myTest", ofType: "mp3")
        
        self.audioPlayer.delegate = self
    }


}

注意事项：

经测试，该方法只可以播放“源格式音频”。什么叫“源格式音频”，就是指该音频一开始是什么格式，调用时其种类就要写什么格式；而不是假设一开始源格式为mp3，人为地直接把文件名强行改为wma格式，这是不行的；但如果说一开始是mp3，经过音频转码转为其它格式则是可以的。之前从某个网站下下来的音频就是打不开，转码后才能打开播放就是这个原因。