Example of using AVAudioRecorder

SpeechToTextTests.swift

    func testRecording() {
    
        let recordExpectation = expectationWithDescription("Record")
        
        let recordSettings = [
            // AVFormatIDKey: NSNumber(unsignedInt:kAudioFormatLinearPCM),
            AVNumberOfChannelsKey: 1,
            AVSampleRateKey : 16000.0
        ]
        
        let dirsPaths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
        let docsDir = dirsPaths[0] as String
        let soundFilePath = docsDir + "/test.wav"
        
        print("Saving recorded audio file in \(soundFilePath)")
        AVAudioSession.sharedInstance().requestRecordPermission({(granted: Bool) -> Void
            in
            if granted {
                let soundFileURL = NSURL(string: soundFilePath)
                
                if let soundFileURL = soundFileURL {
                    
                    do {
                        
                        self.recorder = try AVAudioRecorder(URL: soundFileURL, settings: recordSettings)
                    
                        self.recorder.meteringEnabled = true
                        
                        // self.recorder.prepareToRecord()
                        self.recorder.recordForDuration(3.0)
                        
                        sleep(5)
                        
                        print(self.recorder.recording)
                        
                        self.recorder.stop()
                        
                        recordExpectation.fulfill()
                        
                    } catch {
                        
                        
                        XCTAssertTrue(false, "Could not create audio recorder")
                    }
                }

            }
            
        })
        
        waitForExpectationsWithTimeout(timeout) {
            error in XCTAssertNil(error, "Timeout")
        }
    }