Write Code (Swift)

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The code below assumes you've created a label and linked it to an IBOutlet named mainLabel, a button and linked it to an IBOutlet named calibrationButton, and a text input and linked it to an IBOutlet named knownWeight.

  
import Cocoa
//Add Phidgets Library
import Phidget22Swift

class ViewController: NSViewController {
        
    //Create
    let scale = VoltageRatioInput()
    
    @IBOutlet weak var mainLabel: NSTextField!
    @IBOutlet weak var knownWeight: NSTextField!
    @IBOutlet weak var calibrationButton: NSButton!
    var offset = 0.0
    var slope = 0.0
    var average = 0.0
    var count = 0
    
    override func viewDidLoad() {
        super.viewDidLoad()
        do{
            //Subscribe to event
            let _ = scale.voltageRatioChange.addHandler(scale_change)
            
            //Open
            try scale.open()
            
            //Set data interval to minimum
            try scale.setDataInterval(scale.getMinDataInterval())
            
        }catch{
            print(error)
        }
    }
    
    func scale_change(sender:VoltageRatioInput, voltageRatio: Double){
        
    }
    @IBAction func calibrationButton(_ sender: Any) {
        do{
            average = 0
            count = 0
            
            if(calibrationButton.title == "Begin Calibration"){
                while(count < 64){
                    try average += scale.getVoltageRatio()
                    count += 1
                    usleep(20000)
                }
                offset = average / Double(count)
                
                calibrationButton.title = "Continue Calibration"
                mainLabel.stringValue = "Place known weight on scale and press Continue Calibration."
            }
            else{
                if let knownWeightVal = Double(knownWeight.stringValue){
                    while(count < 64){
                        try average += scale.getVoltageRatio()
                        count += 1
                        usleep(20000)
                    }
                    let measuredWeight = average / Double(count)
                    let slope = knownWeightVal / (measuredWeight - offset)
                    mainLabel.stringValue = "Your new slope value is: " + String(format: "%.0f",slope)
                }
                else{
                    mainLabel.stringValue = "ERROR. Please enter a correct weight in kg above. Then place known weight on scale and press Continue Calibration."
                }
            }
        }catch{
            print(error)
        }
    }
}