ios - EXC_BAD_ACCESS KERN_INVALID_ADDRESS iOS 11.2 Swift 4.0

Question

仅在 iOS 11.2 中，我在以下代码中遇到崩溃。我正在使用快速4.0。我尝试调试几个小时来重现崩溃，但未能成功。这是代码

func prepareNewConnection(conn:String) -> RTCPeerConnection {

    let uuid = UIDevice.current.identifierForVendor?.uuidString

    localAudioTrack = peerConnectionFactory.audioTrack(withTrackId: uuid!)

        mediaStream = peerConnectionFactory.mediaStream(withStreamId: LOCAL_MEDIA_STREAM_ID)
        if(localAudioTrack != nil && mediaStream != nil)
        {
            mediaStream.addAudioTrack(localAudioTrack!) //Crash on this line
        }

    let pc = peerConnectionFactory.peerConnection(with: rtcConfig, constraints: mediaConstraints, delegate: self)
    if(mediaStream != nil)
    {
        pc.add(mediaStream)
    }

return pc;
}

这是 crashlytics 报告。

我将非常感谢任何帮助。

Answer 1

请避免安全地打开包装，使用 if let ..

 func prepareNewConnection(conn:String) -> RTCPeerConnection {

   if let uuid = UIDevice.current.identifierForVendor?.uuidString {
localAudioTrack = peerConnectionFactory.audioTrack(withTrackId: uuid) //removed safely Unwrapping
    mediaStream = peerConnectionFactory.mediaStream(withStreamId: LOCAL_MEDIA_STREAM_ID)
 let pc = peerConnectionFactory.peerConnection(with: rtcConfig,constraints: mediaConstraints, delegate: self)
    if(localAudioTrack != nil && mediaStream != nil)
    {
        mediaStream.addAudioTrack(localAudioTrack)
        pc.add(mediaStream) 
    }
  }
 return pc
}