Swift – Checking unmanaged address book single value property for nil

by

If I want the values associated with various properties, I use the following syntax:

let first = ABRecordCopyValue(person, kABPersonFirstNameProperty)?.takeRetainedValue() as? String
let last  = ABRecordCopyValue(person, kABPersonLastNameProperty)?.takeRetainedValue() as? String

Or you can use optional binding:

if let first = ABRecordCopyValue(person, kABPersonFirstNameProperty)?.takeRetainedValue() as? String {
    // use `first` here
}
if let last  = ABRecordCopyValue(person, kABPersonLastNameProperty)?.takeRetainedValue() as? String {
    // use `last` here
}

If you really want to return a non-optional, where missing value is a zero length string, you can use the ?? operator:

let first = ABRecordCopyValue(person, kABPersonFirstNameProperty)?.takeRetainedValue() as? String ?? ""
let last  = ABRecordCopyValue(person, kABPersonLastNameProperty)?.takeRetainedValue() as? String ?? ""

More Related Contents:

  1. Accessing iOS Address Book with Swift: array count of zero
  2. Best way to create this effect in swift ios [closed]
  3. How do I install CocoaPods?
  4. How to write a file to a folder located at Apple’s Files App in Swift
  5. How to play a local video with Swift?
  6. How can I scan barcodes on iOS? [closed]
  7. How to create auto incremented key in Firebase?
  8. iOS 10.3: NSStrikethroughStyleAttributeName is not rendered if applied to a sub range of NSMutableAttributedString
  9. How do I set bold and italic on UILabel of iPhone/iPad?
  10. get progress from dataTaskWithURL in swift
  11. Programmatically navigate to another view controller/scene
  12. Find Object with Property in Array
  13. Using UpdateChildValues to delete from Firebase
  14. Xcode MyProjectName-Bridging-Header.h does not exist
  15. Get pixel data as array from UIImage/CGImage in swift
  16. iOS push notification: how to detect if the user tapped on notification when the app is in background?
  17. How do I set UIButton background color forState: UIControlState.Highlighted in Swift
  18. Why Is UITextField.text An Optional?
  19. Can somebody give a snippet of “append if not exists” method in swift array?
  20. How to get navigation based template functionality in Swift programming
  21. How to use NSLocalizedString function with variables in Swift?
  22. How to check if a file exists in the Documents directory in Swift?
  23. After upgrading to Xcode 11.2 from Xcode 11.1, app crashes due to _UITextLayoutView
  24. Attempting to load the view of a view controller while it is deallocating… UISearchController
  25. Create and perform segue without storyboards
  26. Swift UITableView reloadData in a closure
  27. How can I generate a barcode from a string in Swift?
  28. Gamecenter ios 9 GameCenter GKLocalPlayerListener methods not called
  29. Calculate all permutations of a string in Swift
  30. How do I do weak linking in Swift?

Leave a Comment