Unable to create Singleton - swift

Question

i want to make contact book to i made a class of contact.
there is no compile error but when i run the init i do not get to the "init"pass stage.
what can be the problem ?
here is my code:
import UIKit
public class contact {
var originalNumber: String = ""
var e164Number: String = ""
var contactImage: String = ""
var name: String = ""
init (originalNumber: String, name: String) {
self.originalNumber = originalNumber
self.name = name
}
}
then in my contactDataClass i made:
import UIKit
import AddressBook // imports the framework
class contactsDataClass {
var adbk : ABAddressBook!
var localContacts = [contact]()
init() {
print("get to init")
contactsDataClass.sharedInstance.localContacts.append(contact(originalNumber: "0525222022", name: "try appent"))
print("init pass")
}
struct Static {
static var onceToken : dispatch_once_t = 0
static var instance : contactsDataClass? = nil
}
class var sharedInstance : contactsDataClass {
dispatch_once(&Static.onceToken){
Static.instance = contactsDataClass()
}
return Static.instance!
}
}

Answer 1

You have created infinite recursion
Infact this block
class var sharedInstance : contactsDataClass {
dispatch_once(&Static.onceToken){
Static.instance = contactsDataClass()
}
return Static.instance!
}
calls this
init() {
print("get to init")
contactsDataClass.sharedInstance.localContacts.append(contact(originalNumber: "0525222022", name: "try appent"))
print("init pass")
}
which again calls the first block...
Let's clean up your code
public class Contact {
var originalNumber: String
var e164Number = ""
var contactImage = ""
var name: String
init (originalNumber: String, name: String) {
self.originalNumber = originalNumber
self.name = name
}
}
class ContactManager {
static let sharedInstance = ContactManager()
private init() {}
var adbk : ABAddressBook! // this is dangerous...
var contacts = [Contact]()
}
As you can see defining a Singleton class in Swift is much easier than in Objective-C.
You just need to hide the default initializer and create the static constant sharedInstance as shown above.
Usage
ContactManager.sharedInstance.contacts.append(Contact(originalNumber: "0525222022", name: "Test name"))
print(ContactManager.sharedInstance.contacts[0].name) // "Test name"