Passing data from several VC's to a last one in Swift - ios

Question

As you can appreciate in this pic we have an App with three different VC's and a Last one with some variable data depending of the options selected on the previous ones.
So, for instance, in this case the user had selected a blue color, a suited style and a L as size.
Our idea is to pass data from the first VC, second VC, and the third VC to the gaps in Last VC.
Any suggestions? It would be very appreciated.

Answer 1

Create a model class where you can store those properties in :
class MyChoices {
var color : String? // or you could use enums for each of them
var style : String? // that would be a better choice, but for the
var size : String? // sake of simplicity I use strings in this example
}
then you pass a variable of type MyChoices from one VC to another in your prepareForSegue method
EDIT (some more info, see answer from FactorJose)
In VC 1 add your variable
class VC1: UIViewController {
#IBOutlet weak var nextOutlet: UIButton!
#IBOutlet weak var colourLabel: UILabel!
var choice : MyChoice?
...
and then further on :
#IBAction func redButton(sender: AnyObject) {
nextOutlet.hidden = false
colourLabel.text = "Red colour selected"
choice.color = "Red"
}
for all those IBActions.
then in your prepareForSegue
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
let nextVC = segue.destinationViewController as! VC2
nextVC.choice = self.choice
}
VC2 and VC3 are very similar again

Answer 2

Hi all! As you can appreciate in this pic we have an App with three different VC's and a Last one with some variable data depending of the options selected on the previous ones.
So, for instance, in this case the user had selected a blue color, a suited style and a L as size.
Our idea is to pass data from the first VC, second VC, and the third VC to the gaps in Last VC.
Any suggestions guys? It would be very appreciated
Code :
class VC1: UIViewController {
#IBOutlet weak var nextOutlet: UIButton!
#IBOutlet weak var colourLabel: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
nextOutlet.hidden = true
}
#IBAction func redButton(sender: AnyObject) {
nextOutlet.hidden = false
colourLabel.text = "Red colour selected"
}
#IBAction func blueButton(sender: AnyObject) {
nextOutlet.hidden = false
colourLabel.text = "Blue colour selected"
}
#IBAction func greenButton(sender: AnyObject) {
nextOutlet.hidden = false
colourLabel.text = "Green colour selected"
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {}
}
VC2 and VC3 are the same as VC1 (same outlets and buttons)
lastVC
#IBOutlet weak var colourLabel: UILabel!
#IBOutlet weak var styleLabel: UILabel!
#IBOutlet weak var sizeLabel: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
And the last class to store the strings
import UIKit
class MyChoices {
var colour : String?
var style : String?
var size : String?
}
What can we do?

Answer 3

An alternative to Glenn's answer is to use NSUserDefaults. Think of it like a mini key-value database for PropertyLists.
You can add a new key-value to it with
let defaults = NSUserDefaults.standardUserDefaults()
defaults.setObject(clothingColor, forKey: "Clothing Color")
And then retrieve a previously saved key-value by doing
let defaults = NSUserDefaults.standardUserDefaults()
let clothingColor = defaults.objectForKey("Clothing Color")
Since the user defaults is shared and stored in disk, the information will persist across your different view controllers. It also respects encapsulation, which is good object orientation practice, since your size controller won't have to know anything about color or style and vice versa.