Question

我有一个播放3种不同音频的应用。我有一个音量控制滑块。对于单个音频，它工作正常。

但是，如果我更改音频，则音量会自动变为最大。这是流程：

播放音频1.
我使用滑块减小音量并使其接近零（不是零，但体积非常小）。
现在我选择音频2。
音量应该很低。但它又变得最大。

这是代码：

@IBAction func volumeSlidercontroller(_ sender: UISlider) {

    player.volume = volumeSlider.value;

我包含滑块值的截图。

这是播放器的代码：

@IBAction func music1(_ sender: UIButton) {


        let path = Bundle.main.path(forResource: "fire1", ofType: "mp3")
        let filePath = NSURL(fileURLWithPath:path!)
        player = try! AVAudioPlayer.init(contentsOf: filePath as URL)
        player.numberOfLoops = -1 //logic for infinite loop
        player.prepareToPlay()
        player.play()


        let audioSession = AVAudioSession.sharedInstance()
        try!audioSession.setCategory(AVAudioSessionCategoryPlayback, with: AVAudioSessionCategoryOptions.duckOthers)

        UserDefaults.standard.set("fire1", forKey: "music")
        toggleButton(button: music01, onImage: #imageLiteral(resourceName: "music select"), offImage:  #imageLiteral(resourceName: "music select"))
        toggleButton(button: music02, onImage: #imageLiteral(resourceName: "music unselect"), offImage: #imageLiteral(resourceName: "music unselect"))

        toggleButton(button: music03, onImage: #imageLiteral(resourceName: "music unselect"), offImage: #imageLiteral(resourceName: "music unselect"))
        let defaults = UserDefaults.standard
        defaults.set(true, forKey: "InstructionsButtonIsHidden")

//            let sounddefaults = UserDefaults.standard
//            player.pause()
        onoffLabel.setTitle("on", for: .normal)

//            sounddefaults.set(true, forKey: "soundMute")





}

@IBAction func music2(_ sender: UIButton) {
    let path = Bundle.main.path(forResource: "fire2", ofType: "mp3")
    let filePath = NSURL(fileURLWithPath:path!)
    player = try! AVAudioPlayer.init(contentsOf: filePath as URL)
    player.numberOfLoops = -1 //logic for infinite loop
    player.prepareToPlay()
    player.play()


    let audioSession = AVAudioSession.sharedInstance()
    try!audioSession.setCategory(AVAudioSessionCategoryPlayback, with: AVAudioSessionCategoryOptions.duckOthers)



    UserDefaults.standard.set("fire2", forKey: "music")
    toggleButton(button: music02, onImage: #imageLiteral(resourceName: "music select"), offImage: #imageLiteral(resourceName: "music select"))
    toggleButton(button: music03, onImage: #imageLiteral(resourceName: "music unselect"), offImage: #imageLiteral(resourceName: "music unselect"))
    toggleButton(button: music01, onImage: #imageLiteral(resourceName: "music unselect"), offImage: #imageLiteral(resourceName: "music unselect"))

    let defaults = UserDefaults.standard
    defaults.set(true, forKey: "InstructionsButtonIsHidden")
    UserDefaults.standard.set(true, forKey: "volumeValue")

//        let sounddefaults = UserDefaults.standard
//        
//        sounddefaults.set(true, forKey: "soundMute")
    onoffLabel.setTitle("on", for: .normal)

}

@IBAction func music3(_ sender: UIButton) {
    let path = Bundle.main.path(forResource: "fire3", ofType: "mp3")
    let filePath = NSURL(fileURLWithPath:path!)
    player = try! AVAudioPlayer.init(contentsOf: filePath as URL)
    player.numberOfLoops = -1 //logic for infinite loop
    player.prepareToPlay()
    player.play()


    let audioSession = AVAudioSession.sharedInstance()
    try!audioSession.setCategory(AVAudioSessionCategoryPlayback, with: AVAudioSessionCategoryOptions.duckOthers)



    UserDefaults.standard.set("fire3", forKey: "music")
    toggleButton(button: music03, onImage: #imageLiteral(resourceName: "music select"), offImage: #imageLiteral(resourceName: "music select"))
    toggleButton(button: music02, onImage: #imageLiteral(resourceName: "music unselect"), offImage: #imageLiteral(resourceName: "music unselect"))
    toggleButton(button: music01, onImage: #imageLiteral(resourceName: "music unselect"), offImage: #imageLiteral(resourceName: "music unselect"))

    let defaults = UserDefaults.standard
    defaults.set(true, forKey: "InstructionsButtonIsHidden")
    UserDefaults.standard.set(true, forKey: "volumeValue")

//        let sounddefaults = UserDefaults.standard
//        
//        sounddefaults.set(true, forKey: "soundMute")
    onoffLabel.setTitle("on", for: .normal)


}



func SetUpSound() {

    if let path = Bundle.main.path(forResource: "fire1", ofType: "mp3") {
        let filePath = NSURL(fileURLWithPath:path)
        player = try! AVAudioPlayer.init(contentsOf: filePath as URL)
        player.numberOfLoops = -1 //logic for infinite loop
        player.prepareToPlay() 
        player.play()
    }

    let audioSession = AVAudioSession.sharedInstance()
    try!audioSession.setCategory(AVAudioSessionCategoryPlayback, with: AVAudioSessionCategoryOptions.duckOthers)
}

有没有办法播放以前固定音量的音频？即，如果我保持音量1的低音量，音频2也应低。它不应该成为最大的。任何帮助是极大的赞赏。

Answer 1

每次播放下一个音频文件时，您都在重新创建AVAudioPlayer。这意味着您设置的先前音量设置现在被丢弃。将此行添加到您创建音频播放器的位置：

player = try! AVAudioPlayer.init(contentsOf: filePath as URL)
player.volume = volumeSlider.value

以这种方式使用自己的音量控制滑块的问题是你没有调整系统音量 - 但实际上这可能就是你想要的。因此，如果设备音量设置为50％，然后用户将滑块设置为100％ - 这仍将仅为50％音量。您可能需要查看MPVolumeView，它可以访问系统音量滑块，这将始终影响AVAudioPlayer，您无需直接设置播放器音量。它还允许您访问Airplay图标，以便用户可以轻松地在蓝牙或Airplay设备（如Apple TV）上播放音频。

另一件事是你在整个过程中重复相同的代码。你可以通过一个只传递音频文件名的播放功能来整理它，如下所示：

func playAudio(name: String) {
    let path = Bundle.main.path(forResource: name, ofType: "mp3")
    let filePath = NSURL(fileURLWithPath:path!)
    player = try! AVAudioPlayer.init(contentsOf: filePath as URL)
    player.numberOfLoops = -1 //logic for infinite loop
    player.prepareToPlay()
    player.play()
}

然后你可以这样称呼：

@IBAction func music1(_ sender: UIButton) {
    playAudio(name: "fire1")
    ...

音量不断重置为不同的音频 - ios swift

1 个答案: