Method called by NSTimer to update frequency values from FFT

timerTick.swift

func timerTick(sender:NSTimer?) {
        if audioManager.isPlaying() {
            //Get the frequency data from the audio manager and show on horizontal bar graph
            var size:UInt32 = 0
            let frequencyData = audioManager.guitarFrequencyDataOfLength(&size)
            let frequencyValuesArray = Array<Float32>(UnsafeBufferPointer(start: UnsafePointer(frequencyData), count: Int(size)))
            
            //Sanity check for expected 256 length
            if frequencyValuesArray.count == 256 {
                frequencyView.frequncyValues = frequencyValuesArray
            }
        }
    }