CoreData on Mac OS is not saving. Can't figure out why?

Hello:

I bult an app for iOS successfully using CoreData. Now I am working on an app on Mac OSx with the latest version of Swift and Xcode.

However, I am unable to save any data. I am relatively new to Xcode so my problem, I'm sure, is due to a lack of expertise with programming in Swift. (I have done a lot of work with Oracle).

I am currently trying to save information entered into text fields to CoreData, without success.

Below is my code. I get no runtime errors. I hope someone can point me to the changes I need to make.

1. import Cocoa
2. import CoreData
3. class Register: NSViewController {
4. var items: [NSManagedObject]
5. requiredinit?(coder aDecoder: NSCoder) {
6. self.items = []
7. super.init(coder: aDecoder)
8. }
9. overridefunc viewDidLoad() {
10. super.viewDidLoad()
11. if let firstNameTextField = firstNameTextField {
12. firstNameTextField.delegate = (self as NSTextFieldDelegate)
13. }
14. if let middleNameTextField = middleNameTextField {
15. middleNameTextField.delegate = (self as NSTextFieldDelegate)
16. }
17. if let lastNameTextField = lastNameTextField {
18. lastNameTextField.delegate = (self as NSTextFieldDelegate)
19. }
20. if let birthdateTextField = birthdateTextField {
21. birthdateTextField.delegate = (self as NSTextFieldDelegate)
22. }
23. if let schoolTextField = schoolTextField {
24. schoolTextField.delegate = (self as NSTextFieldDelegate)
25. }
26. if let schoolAddressTextField = schoolAddressTextField {
27. schoolAddressTextField.delegate = (self as NSTextFieldDelegate)
28. }
29. if let schoolCityTextField = schoolCityTextField {
30. schoolCityTextField.delegate = (self as NSTextFieldDelegate)
31. }
32. if let schoolStateTextField = schoolStateTextField {
33. schoolStateTextField.delegate = (self as NSTextFieldDelegate)
34. }
35. if let emailTextField = emailTextField {
36. emailTextField.delegate = (self as NSTextFieldDelegate)
37. }
38. }
39. @IBOutletweakvar firstNameTextField: NSTextField!
40. @IBOutletweakvar middleNameTextField: NSTextField!
41. @IBOutletweakvar lastNameTextField: NSTextField!
42. @IBOutletweakvar birthdateTextField: NSTextField!
43. @IBOutletweakvar schoolTextField: NSTextField!
44. @IBOutletweakvar schoolAddressTextField: NSTextField!
45. @IBOutletweakvar schoolCityTextField: NSTextField!
46. @IBOutletweakvar schoolStateTextField: NSTextField!
47. @IBOutletweakvar emailTextField: NSTextField!
48. @IBActionfunc saveRegistrant(_ sender: Any) {
49. print("SAVE ACTION STARTED")
50. let appDelegate = NSApplication.shared.delegate as! AppDelegate
51. let managedContext = appDelegate.persistentContainer.viewContext
52. let entity = NSEntityDescription.entity(forEntityName: "Registration", in: managedContext)!
53. let registerStudentsObject = NSEntityDescription.insertNewObject(forEntityName: "Registration", into: managedContext)
54. print("MOC READ")
55. let component = NSManagedObject(entity: entity, insertInto: managedContext)
56. registerStudentsObject.setValue(firstNameTextField, forKeyPath: "firstName")
57. registerStudentsObject.setValue(middleNameTextField, forKey: "middleName")
58. registerStudentsObject.setValue(lastNameTextField, forKey: "lastName")
59. registerStudentsObject.setValue(birthdateTextField, forKey: "dob")
60. registerStudentsObject.setValue(schoolTextField, forKey: "school")
61. registerStudentsObject.setValue(schoolAddressTextField, forKey: "schoolAddress")
62. registerStudentsObject.setValue(schoolCityTextField, forKey: "schoolCity")
63. registerStudentsObject.setValue(schoolStateTextField, forKey: "schoolState")
64. registerStudentsObject.setValue(emailTextField, forKey: "email")
65. print("FIELDS READ")
66. do
67. {
68. try managedContext.save()
69. items.append (component)
70. print("saved")
71. }
72. catch
73. {
74. }
75. }
76. }
77. extension Register: NSTextFieldDelegate {
78. func control(_ control: NSControl, textShouldEndEditing fieldEditor: NSText) -> Bool {
79. if let textField = control as? NSTextField {
80. print(textField.stringValue)
81. }
82. return true
83. }
84. }