In this book, you will find a number of text styles that distinguish between different kinds of information. Here are some examples of these styles and an explanation of their meaning.

Code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: "There's a good probability that you have used UITableView."

A block of code is set as follows:

class ViewController: UIViewController { 
 
    override func viewDidLoad() { 
        super.viewDidLoad() 
 
        let store = CNContactStore() 
 
        if CNContactStore.authorizationStatus(for: .contacts) == .notDetermined { 
            store.requestAccess(for: .contacts, completionHandler: {[weak self] 
              authorized, error in 
                if authorized { 
                    self?.retrieveContacts(fromStore: store) 
                }

New terms and important words are shown in bold. Words that you see on the screen, for example, in menus or dialog boxes, appear in the text like this: " Use the Reset to Suggested Constraints option that was used earlier."