iOS unwind CollectionView at didSelectItemAtIndexPath - ios

Question

So i have created an app where users create custom workouts.
You enter the first view add a x number of rounds,than you click on a button in the tableview where you add rounds.That click opens another activity with a collectionview.
So the problem is here when i click on an element witch represents the exercise that needs to be in the round it sends me an empty result.By default if i add a value to that string it works.
I have noticed that the unwind happens before my didSelectItemAtIndexPath
import UIKit
class InsertWorkout: UIViewController{
#IBOutlet var InsertRoundTable: UITableView!
#IBOutlet weak var txtName: UITextField!
var RoundNumber : NSMutableArray = ["Round 1"]
var RoundLabel : NSMutableArray = [""]
var RoundExercise : NSMutableArray = ["add-1"]
var RoundExerciseImages : NSMutableArray = ["providno"]
var RoundNumber_Count=1
var RoundNumber_Add_Counter=1
var studentData : StudentInfo!
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
//MARK: UIButton Action methods
#IBAction func btnBackClicked(sender: AnyObject)
{
self.navigationController?.popViewControllerAnimated(true)
}
#IBAction func btnSaveClicked(sender: AnyObject)
{
if(txtName.text == "")
{
Util.invokeAlertMethod("", strBody: "Please enter workout name.", delegate: nil)
}
else
{
let studentInfo: StudentInfo = StudentInfo()
studentInfo.workout_name = txtName.text!
studentInfo.workout_benefit_1=" CUSTOM "
studentInfo.workout_benefit_2=" WORKOUT "
studentInfo.workout_benefit_3=""
studentInfo.workout_requiremnets="arsutech.com"
studentInfo.workout_time="4min"
let isInserted = ModelManager.getInstance().addWorkoutData(studentInfo)
if isInserted {
Util.invokeAlertMethod("", strBody: "Workout added", delegate: nil)
} else {
Util.invokeAlertMethod("", strBody: "Error while adding workout.", delegate: nil)
}
self.navigationController?.popViewControllerAnimated(true)
}
}
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
self.view.endEditing(true)
InsertRoundTable.endEditing(true)
}
//UITableView
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
// #warning Potentially incomplete method implementation.
// Return the number of sections.
return 1
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete method implementation.
// Return the number of rows in the section.
return RoundNumber.count
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell
{
var cell : InsertRoundCell! = tableView.dequeueReusableCellWithIdentifier("InsertRoundCell") as! InsertRoundCell
if(cell == nil)
{
cell = NSBundle.mainBundle().loadNibNamed("InsertRoundCell", owner: self, options: nil)[0] as! InsertRoundCell;
}
let exerviseName = RoundNumber[indexPath.row]
let exerciseLabels = RoundLabel[indexPath.row]
let exerciseImage = RoundExercise[indexPath.row]
let exerciseImage_Holder = RoundExerciseImages[indexPath.row]
cell.insert_label_Round.text = exerviseName as? String
cell.addWorkout_Label.text = exerciseLabels as? String
cell.addExercise_Holder?.image = UIImage(named: exerciseImage_Holder as! String) as UIImage?
cell.addWorkoutBut.setBackgroundImage(UIImage(named: exerciseImage as! String) as UIImage?, forState: UIControlState.Normal)
cell.addWorkoutBut.tag = indexPath.row
cell.addWorkoutBut.addTarget(self, action: "logAction:", forControlEvents: .TouchUpInside)
cell.selectionStyle = UITableViewCellSelectionStyle.None
return cell as InsertRoundCell
}
#IBAction func logAction(sender: UIButton){
//self.RoundNumber.replaceObjectAtIndex(sender.tag, withObject: "Ezel")
//let titleString = self.RoundNumber[sender.tag] as? String
//Util.invokeAlertMethod("", strBody: titleString!, delegate: nil)
self.InsertRoundTable.reloadData()
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject!) {
let destinationVC = segue.destinationViewController as! ChoseExercise
destinationVC.id=sender.tag
RoundNumber_Count=sender.tag
}
#IBAction func unwinndChoseExercise(segue:UIStoryboardSegue){
if let svc = segue.sourceViewController as? ChoseExercise{
self.RoundLabel.replaceObjectAtIndex(RoundNumber_Count, withObject: "\(svc.exercise_label)")
self.RoundExercise.replaceObjectAtIndex(RoundNumber_Count, withObject: "providno")
self.RoundExerciseImages.replaceObjectAtIndex(RoundNumber_Count, withObject: "\(svc.exercise_image)")
self.InsertRoundTable.reloadData()
}
}
//Add Round
#IBAction func addRound(sender: AnyObject) {
if(RoundNumber_Add_Counter<12){
RoundNumber_Add_Counter++
self.RoundNumber.addObject("Round \(RoundNumber_Add_Counter)")
self.RoundLabel.addObject("")
self.RoundExercise.addObject("add-1")
self.RoundExerciseImages.addObject("providno")
self.InsertRoundTable.reloadData()
}else{
Util.invokeAlertMethod("", strBody: "This is the maximum number of rounds", delegate: nil)
}
}
}
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return self.exercisesNames.count
}
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCellWithReuseIdentifier("cellexercises_insert", forIndexPath: indexPath) as! Insert_ExerciseCollectionViewCell
cell.insert_exerciseImage?.image = self.exercisesImages[indexPath.row]
cell.insert_exerciseLabel?.text = self.exercisesNames[indexPath.row]
cell.insert_exercisesHardnessImg?.image = self.exercisesHardnessImg[indexPath.row]
return cell
}
func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
exercise_label="\(exercisesNames[indexPath.row])"
exercise_image="\(exercises_Exervise_Row_Names[indexPath.row])"
dismissViewControllerAnimated(true, completion: nil)
}

Answer 1

Here is how unwinding works:
First, put your IBAction unwind(segue:UIStoryboardSegue) in the vc where you intend to go back (presenter vc, InsertWorkout in this case).
Second, go to storyboard and choose the vc where you'll unwind from (collection view in this case) and ctrl-drag from the button/cell that causes the unwind (collection view cell in your case) to the exit button on top of that same vc and you should see a pop-up with your IBAction unwind method name under 'Selection Segue'.
Third, implement prepareforsegue in the current vc (collection vc in this case) to pass your data back.
class InsertWorkout
{
IBAction func unwind(segue:UIStoryboardSegue) {
//use the data passed from prepare to update your ui or you can also communicate to the sender using segue.sourceVC
}
}
class CollectionVC
{
override func prepareForSegue(segue: UIStoryboadSegue, sender: AnyObject?){
if segue.identifier == "whatever you put in storyboard for segue id" {
if let inserWorkoutVC = segue.destinationViewController as? InsertWorkout {
//pass the data here but don't attempt to update your destination's view ui!!,
}
}
}
}