Segue arrays not passing why? - ios

Question

I'm at my wits end. I've got basically the same thing working (but with a simpler function to generate the variables in a test project) but now my code is passing blank arrays to the next view controller.
I'm just wanting to pass 2 arrays, the values for which are generated through a function, to the next VC - I've triple checked my code and I'm sure I've done it right but obviously not! Any ideas!?
1st VC :
import UIKit
class WorkoutSetupController: UIViewController {
#IBOutlet weak var timeInputField: UITextField!
override func viewDidLoad() {
super.viewDidLoad()}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()}
//Create function to generate a new random workout, with a random exercise array, and random reps array
func generateNewWorkout() -> (randomExerciseArray:[String], randomRepsArray:[Int]) {
let randomKey = Int(arc4random_uniform(4) + 3)
var workoutSet = [String]()
let possibleExercises = masterExerciseArray
var repsSet = [Int]()
while workoutSet.count < (randomKey) {
let randomIndex = Int(arc4random_uniform(UInt32(possibleExercises.count)))
workoutSet.append(possibleExercises[randomIndex])
}
while repsSet.count < (randomKey) {
repsSet.append(Int(arc4random_uniform(30)))
}
//return the values and print them to make sure the function is working (it is!)
let workoutToBePassed = workoutSet
let repsToBePassed = repsSet
print (workoutToBePassed, repsToBePassed)
return (workoutToBePassed, repsToBePassed)
}
//perform a manual segue to the WorkoutController page, using the function above to generate the values to be passed
#IBAction func workoutButtonPressed(_ sender: UIButton) {
performSegue(withIdentifier: "doItNow", sender: generateNewWorkout())
}
//set the variables to be passed to the new VC, accepting the format of the returned arrays from my function for the variables
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "doItNow" {
if let destVC = segue.destination as? WorkoutController, let variablesToBePassed = sender as? (arr1:[String],arr2:[Int]) {
print (variablesToBePassed.arr1, variablesToBePassed.arr2)
destVC.selectedWorkoutExerciseArray = variablesToBePassed.arr1
destVC.selectedWorkoutRepsArray = variablesToBePassed.arr2
}
}
}
}
second VC :
import UIKit
class WorkoutController: UIViewController {
//set the variables we're passing from the first VC with the right data type
var selectedWorkoutExerciseArray = [String]()
var selectedWorkoutRepsArray = [Int]()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func printButtonPressed(_ sender: UIButton) {
//print the variables out - this is currently printing blank arrays arghhghghghh!
print (selectedWorkoutExerciseArray, selectedWorkoutRepsArray)
}
}
Where am I going wrong!? I can't see it anywhere! Please help!

Answer 1

The parameter labels of the tuple don't match, you have to check
let variablesToBePassed = sender as? (randomExerciseArray:[String], randomRepsArray:[Int]) {
This is a good example of the benefit of force unwrapping objects which must have a value of the expected type
let destVC = segue.destination as! WorkoutController
let variablesToBePassed = sender as! (arr1:[String],arr2:[Int])
If the code crashes it reveals the design error at once.