“尝试AVAudioSession.sharedInstance().setCategory"；仅在设备上返回nil [英] "try AVAudioSession.sharedInstance().setCategory" returns nil on only device

问题描述

try AVAudioSession.sharedInstance()
                  .setCategory(AVAudioSessionCategoryPlayback,
                               with: AVAudioSessionCategoryOptions(rawValue: UInt(UInt8(AVAudioSessionCategoryOptions.defaultToSpeaker.rawValue)
                                                                                | UInt8(AVAudioSessionCategoryOptions.allowAirPlay.rawValue)
                                                                                | UInt8(AVAudioSessionCategoryOptions.allowBluetooth.rawValue)
                                                                                | UInt8(AVAudioSessionCategoryOptions.allowBluetoothA2DP.rawValue))))

返回错误:

Domain = NSOSStatusErrorDomain Code = -50(null)"

Domain=NSOSStatusErrorDomain Code=-50 "(null)"

推荐答案

对于以后发现此问题的任何人来说，这都是解决之道.仅当将AVAudioSessionCategoryPlayback更改为AVAudioSessionCategoryPlayAndRecord时，它才能在设备上运行:

For anyone who finds this in the future here is the solve. It only works on device if you change AVAudioSessionCategoryPlayback to AVAudioSessionCategoryPlayAndRecord like this:

try AVAudioSession.sharedInstance()
                  .setCategory(AVAudioSessionCategoryPlayAndRecord,
                               with: AVAudioSessionCategoryOptions(rawValue: UInt(UInt8(AVAudioSessionCategoryOptions.defaultToSpeaker.rawValue)
                                                                                | UInt8(AVAudioSessionCategoryOptions.allowAirPlay.rawValue)
                                                                                | UInt8(AVAudioSessionCategoryOptions.allowBluetooth.rawValue)
                                                                                | UInt8(AVAudioSessionCategoryOptions.allowBluetoothA2DP.rawValue))))

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