ios 听筒和扬声器切换

hehe.swift

            let session = AVAudioSession.sharedInstance()
            try? session.setActive(true)
            if !isSpeakerMode {
                //                NSLog(@"Device is close to user");
                do {
                    try AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayAndRecord)
                    try AVAudioSession.sharedInstance().overrideOutputAudioPort(.none)
                } catch _ {}
            } else {
                //                NSLog(@"Device is not close to user");
                do {
                    try AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback)
                    try AVAudioSession.sharedInstance().overrideOutputAudioPort(.speaker)
                } catch _ {}
            }