Passing Data between View Controllers in Swift - ios

Question

I am trying to convert an app from Objective-C to Swift but I can't find how to pass data between views using Swift. My Objective-C code is
UIStoryboard *storyBoard = [UIStoryboard storyboardWithName:#"Main" bundle:nil];
AnsViewController *ansViewController;
ansViewController = [storyBoard instantiateViewControllerWithIdentifier:#"ansView"];
ansViewController.num = theNum;
[self presentViewController:ansViewController animated:YES completion:nil];
What that is doing is it basically takes the variable, theNum, and passes it to the variable, num, on a different view controller. I know this may be an easy question but I am getting pretty confused with Swift so if someone could explain how they changed it to Swift that would be greatly appreciated!
Thanks

Answer 1

Let's assumed we stand at the firstView go to the DetailView and want passing data from firstView to Detailview. To do that with storyboard, at the firstView we will have a method:
override func prepareForSegue(segue: UIStoryboardSegue!, sender: AnyObject!) {
if (segue.identifier == "segueTest") {
//Checking identifier is crucial as there might be multiple
// segues attached to same view
var detailVC = segue!.destinationViewController as DetailViewController;
detailVC.toPass = textField.text
}
}
and then into the class of DetailView we declared a variable:
var toPass: String!
then you can use the variable toPass (of course you can change the type of the variable as you want, in this EX I just demo for string type).

Answer 2

class AnsViewController: UIViewController {
var theNum: Int
override func viewDidLoad() {
super.viewDidLoad()
println(theNum)
}
}
override func tableView(tableView: UITableView!, didSelectRowAtIndexPath indexPath: NSIndexPath!) {
let viewController = self.storyboard.instantiateViewControllerWithIdentifier("ansView") as AnsViewController
viewController.num = theNum
self.presentViewController(viewController, animated: true, completion: nil)
}

Answer 3

To pass string or any data from one controller to another in swift.
Follows below steps:
1) Create property in child controller as var abc:string!
2) Create object of childcontroller
let storyboard:UIStoryboard()
let viewController: childcontroller = storyboard.instantiateViewControllerWithIdentifier("childcontroller") as! childcontroller
viewController.abc = "hello";
self.navigationController.pushviewController(Controller:viewController animated:true CompletionHandler:nil)

Answer 4

Using tableview,
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath)
{
let ClubProfileView = self.storyboard?.instantiateViewController(withIdentifier: "CBClubProfileViewController") as! CBClubProfileViewController
let TempCulubDic:NSDictionary =
((ClubsListbyDateDic.object(forKey:((ClubsListbyDateDic.allKeys as! [String]).sorted(by: <)as NSArray).object(at: indexPath.section) as! String) as! NSArray).object(at: indexPath.row))as! NSDictionary
let ClubId:String=(TempCulubDic.value(forKey: "club_id") as? String)!
let CheckIndate:String=(TempCulubDic.value(forKey: "chekin_date") as? String)!
ClubProfileView.ClubID=ClubId
ClubProfileView.CheckInDate = CheckIndate
// self.tabBarController?.tabBar.isHidden=true
ClubProfileView.hidesBottomBarWhenPushed = true
self.navigationController?.pushViewController(ClubProfileView, animated: true)
}

Answer 5

#IBAction func nextbtnpreesd(_ sender: Any) {
let mystring = "2"
performSegue(withIdentifier: "MusicVC", sender: mystring)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if let destination = segue.destination as? MusicVC{
if let song = sender as? String{
destination.strlablevalie = song
}
}
}
//in MusicVC create string like:
var strlablevalie:String!

Answer 6

To pass string or any data from one controller to another in swift.
Follows below steps:
1) Create variable of type which you want like (String,Int)
var test : String!
2) Create object of childcontroller
let vc = self.storyboard?.instantiateViewController(withIdentifier: "Here identifier of your VC") as! (Here Name Of Your Controller)
vc.test = "Hello" (Or any data which you want to pass)
self.navigationController?.pushViewController(VC, animated: true)
That should solve your problem

Answer 7

Note: if we are using storyboard
Step 1: Master controller :
// table row which row was selected
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath!) {
tableView.deselectRowAtIndexPath(indexPath, animated: true)
println("You selected cell #\(indexPath.row)!")
nextScreenRow = indexPath.row
// get to the next screen
self.performSegueWithIdentifier("dashboard_static_screen_segue", sender: self)
}
and then;
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject!) {
if (segue.identifier == "dashboard_static_screen_segue") {
var detailController = segue.destinationViewController as StaticScreens;
detailController.screenNumber = nextScreenRow
}
}// end prepareForSegue
step 2: Detail controller (StaticScreen)
// set variable into your detail controller
var screenNumber: NSInteger?
println("selected row \(screenNumber!)")