Custom callouts in MapKit have no text in them

Hello.

I am trying to make custom callouts on my map.

func mapView(mapView: MKMapView, annotationView view: MKAnnotationView, calloutAccessoryControlTapped control: UIControl)
        {
            var calloutDetails = ""
            let annotationTapped = view.annotation as! IGAMapAnnotation
   
            if (annotationTapped.icao == appSingleton.icaoDepShared)
            {
                let facilitiesStr = appSingleton.facilitiesDepShared.joinWithSeparator("\n")
                calloutDetails = NSString(format: "DEPARTURE RUNWAYS/ILS:\n%@",facilitiesStr) as String
            }
               
            else if (annotationTapped.icao == appSingleton.icaoDestShared)
            {
                let facilitiesStr = appSingleton.facilitiesDestShared.joinWithSeparator("\n")
                calloutDetails = NSString(format: "DESTINATION RUNWAYS/ILS:\n%@",facilitiesStr) as String
            }
               
            else if (annotationTapped.icao == appSingleton.icaoAltShared)
            {
                let facilitiesStr = appSingleton.facilitiesAltShared.joinWithSeparator("\n")
                calloutDetails = NSString(format: "ALTERNATE RUNWAYS/ILS:\n%@",facilitiesStr) as String
            }
           
            // Declare and initialize the UIViewController that has the label to contain the callout information
            let detailViewController = IGAAnnotationInfoVC(calloutText: calloutDetails)
   
            if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiom.Pad)
            {
                let popOver = UIPopoverController(contentViewController: detailViewController)
               
                popOver.popoverContentSize = CGSizeMake(detailViewController.txtCallout.frame.size.width + 40,detailViewController.txtCallout.frame.size.height + 40);
               
                popOver.presentPopoverFromRect(view.bounds, inView: view, permittedArrowDirections: UIPopoverArrowDirection.Any, animated: true)
            }
        }

This is my subclassed MKAnnotation:

class IGAMapAnnotation: NSObject, MKAnnotation
    {
        let  coordinate : CLLocationCoordinate2D
        let title : String?
        var navaidType : String
        let frequency : String
        let icao : String
       
        init(coordinate: CLLocationCoordinate2D, title: String, type: String, frequency: String, icao: String)
        {
            self.title = title
            self.navaidType = type
            self.coordinate = coordinate
            self.frequency = frequency
            self.icao = icao
           
            super.init()
        }  
    }

This is my Annotation View Controller:

import UIKit
   
    class IGAAnnotationInfoVC: UIViewController
    {
        var calloutInformation : String = ""
        var txtCallout : IGACalloutLabel!
       
        init()
        {
            super.init(nibName:nil, bundle:nil)
        }
       
       
        required init?(coder aDecoder: NSCoder)
        {
            fatalError("")
        }
       
        convenience init(calloutText : String)
        {
            self.init()
            self.calloutInformation = calloutText;
            self.txtCallout = IGACalloutLabel(frame: CGRectMake(20, 20, 0, 0))
            self.txtCallout?.lineBreakMode = NSLineBreakMode.ByWordWrapping
            self.txtCallout?.numberOfLines=0;
            self.txtCallout?.backgroundColor = UIColor.clearColor()
            self.txtCallout?.textColor = UIColor.blueColor()
            self.txtCallout?.text = calloutInformation;
            self.txtCallout?.drawTextInRect(CGRectMake(10,10,0,0))
            self.txtCallout?.sizeToFit()
            self.view.addSubview(txtCallout!)
        }
    }

And this is my Custom Label Class:

import UIKit
   
    class IGACalloutLabel: UILabel
    {
        var topInset : CGFloat = 0.0
        var leftInset : CGFloat = 0.0
        var bottomInset : CGFloat = 0.0
        var rightInset : CGFloat = 0.0
        
        required init?(coder aDecoder: NSCoder)
        {
            super.init(coder:aDecoder)
            self.setup()
        }
       
        override init(frame:CGRect)
        {
            super.init(frame:frame)
            self.setup()
        }
       
        override  func awakeFromNib() {
            super.awakeFromNib()
            self.setup()
        }
   
        override class func layerClass() -> AnyClass {
            return CATextLayer.self
        }
       
        func textLayer() -> CATextLayer {
            return self.layer as! CATextLayer
        }
       
        func setup()
        {
            self.text = self.text
            self.textColor = self.textColor
            self.font = self.font
            self.textLayer().alignmentMode = kCAAlignmentLeft
            self.textLayer().wrapped = true
            self.layer.display()
        }
       
        override func drawTextInRect(rect: CGRect)
        {
            let insets = UIEdgeInsets(top: topInset, left: leftInset, bottom: bottomInset, right: rightInset)
            return super.drawTextInRect(UIEdgeInsetsInsetRect(rect, insets))
        }
       
        func sizeToFitFixedWidth()
        {
            self.frame = CGRectMake(self.frame.origin.x, self.frame.origin.y, 400, 0);
            self.lineBreakMode = NSLineBreakMode.ByWordWrapping
            self.numberOfLines = 0;
            sizeToFit()
        }
    }

This code was converted by me from Objective C. It did work in Objective C but in Swift it does not. I get the first callout view fine but when I tap on the Info button within the callout, I get a new callout view without any text in it. Not sure where the problem lies.

Thank you!