AVAudioSession.mode causes “Editor placeholder in source file” error while doing a migration from swift 3 to swift 4.2

Question

XCode 10.1 successfully performed the migration, but after I performed a Build some errors crept in. Here is one example:

func setPlayAndRecordMode() {
    let audioSession = AVAudioSession.sharedInstance()

    if convertFromAVAudioSessionCategory(audioSession.category) == convertFromAVAudioSessionCategory(AVAudioSession.Category.playAndRecord) && convertFromAVAudioSessionMode(audioSession.mode) == convertFromAVAudioSessionMode(AVAudioSession.Mode.measurement) {
        return
    }

    do {
         try audioSession.setCategory(AVAudioSession.Category(rawValue: 
         convertFromAVAudioSessionCategory(AVAudioSession.Category.playAndRecord)), mode:  AVAudioSession.Mode) (**error message**: Editor placeholder in source file)

        try audioSession.setMode(AVAudioSession.Mode.measurement)
    } catch {
        print(error)
    }
}

Any thoughts and suggestions appreciated.

Answer 1

You need to pass your mode for example moviePlayBack , spokenAudio etc.. check a complete list here , as an example I passed spokenAudio on your line as shown below.

convertFromAVAudioSessionCategory(AVAudioSession.Category.playAndRecord)), mode:  AVAudioSession.Mode.spokenAudio)