Question

因此，经过大量搜索，我能够找到允许在播放背景音频的同时录制视频的代码块。我在下面粘贴了上述代码块。

fileprivate func setBackgroundAudioPreference() {
    guard allowBackgroundAudio == true else {
        return
    }

    guard audioEnabled == true else {
        return
    }

    do{
        if #available(iOS 10.0, *) {
            try AVAudioSession.sharedInstance().setCategory(.playAndRecord, mode: .default, options: [.mixWithOthers, .allowBluetooth, .allowAirPlay, .allowBluetoothA2DP])
        } else {
            let options: [AVAudioSession.CategoryOptions] = [.mixWithOthers, .allowBluetooth]
            let category = AVAudioSession.Category.playAndRecord
            let selector = NSSelectorFromString("setCategory:withOptions:error:")
            AVAudioSession.sharedInstance().perform(selector, with: category, with: options)
        }
        try AVAudioSession.sharedInstance().setActive(true)
        session.automaticallyConfiguresApplicationAudioSession = false
    }
    catch {
        print("[SwiftyCam]: Failed to set background audio preference")

    }
}

但是，我有一个小问题。由于某些原因，当相机加载背景音频时，音量会降低。当我使用instagram录制视频时，音频不会减少，并且仍然记录，有什么方法可以更改我的当前代码块，以在使用视频重新编码时不降低音量？

我阅读了文档，显然.duckOthers选项应该是减小音量的唯一选项。但是这个也很好

Answer 1

好的，所以在深入研究一些文档之后，我找到了答案。

下面发布了更新的代码。您所要做的就是设置.defaultToSpeaker选项

fileprivate func setBackgroundAudioPreference() {
    guard allowBackgroundAudio == true else {
        return
    }

    guard audioEnabled == true else {
        return
    }

    do{
        if #available(iOS 10.0, *) {
            try AVAudioSession.sharedInstance().setCategory(.playAndRecord, mode: .default, options: [.mixWithOthers, .allowBluetooth, .allowAirPlay, .allowBluetoothA2DP,.defaultToSpeaker])
        } else {
            let options: [AVAudioSession.CategoryOptions] = [.mixWithOthers, .allowBluetooth]
            let category = AVAudioSession.Category.playAndRecord
            let selector = NSSelectorFromString("setCategory:withOptions:error:")
            AVAudioSession.sharedInstance().perform(selector, with: category, with: options)
        }
        try AVAudioSession.sharedInstance().setActive(true)
        session.automaticallyConfiguresApplicationAudioSession = false
    }
    catch {
        print("[SwiftyCam]: Failed to set background audio preference")

    }
}

录制视频时的音频音量

1 个答案: