I have data that is saved with NSUserDefaults in an array of type "[RiskEntry]".
Let me explain to you what I save here and how the process of loading and saving looks like in my code (I took out code not relevant and I am using Swift3):
Main_ViewController
First: In the class Main_ViewController, I get a text transferred from a popover and save it in an array with NSUserDefaults in riskEntry with key "newTry" (this is just a temporary name ;-)) -> 'func riskText(riskTextTransferred: String)'.
Plan_ViewController
Second: when using a segue to get to the table on Plan_ViewController, the table is filled with the text saved in riskEntry with the key "newTry" (cell.riskTitle.text = savedTitles[indexPath.row].title as String). This all works fine so far.
CustomCell and Plan_ViewController
Third: When the user enters a value in the text field of a cell (consequences.text), the value consequences is updated for the riskEntry. So in the beginning, the array had an empty string for consequences. Now, the entry was updated with a text.
if let index = savedTitle.index(where: {$0.title.contains(identifier)}) {
savedTitle[index].consequences = consequencesTranferred
The new string is then saved with the key "newTry". This also works like expected.
Main_ViewController
Fourth: Now I dismiss Plan_ViewController to go back to Main_ViewController. When I now try to load my Array in viewWillAppear() with key "newTry", it is empty.
What am I doing wrong? How can I successfully load the updated data from Plan_ViewController in Main_ViewController?
Main_ViewController
class Main_ViewController: UIViewController, UIPopoverPresentationControllerDelegate, UIGestureRecognizerDelegate {
var riskItemDefaults = UserDefaults.standard
var riskEntry = [RiskEntry]()
override func viewWillAppear(_ animated: Bool) {
if let dataArrayTitle = riskItemDefaults.object(forKey: "newTry") as? [NSData] {
var savedTitle = dataArrayTitle.map { RiskEntry(data: $0)! }
riskItemDefaults.synchronize()
// CHECKPOINT: all arrays are printed empty...
print ("savedTitle: ")
print (savedTitle)
print ("dataArrayTitle: ")
print (dataArrayTitle)
} else {
print ("nothing")
}
}
// ---------------- delegate function that creates the array items -----------------
func riskText(riskTextTransferred: String) {
// CHECKPOINT: Array is saved correctly
riskEntry = [RiskEntry(title: riskTextTransferred, consequences: "")]
let encoded = riskEntry.map {$0.encode() }
riskItemDefaults.set(encoded, forKey: "newTry")
riskItemDefaults.synchronize()
}
}
Plan_ViewController
class Plan_VC: UIViewController, UITableViewDelegate, UITableViewDataSource, CustomCellUpdaterDelegate {
@IBOutlet weak var tableView: UITableView!
var riskEntry = [RiskEntry]()
var riskItemDefaults = UserDefaults.standard
// ---------------- table settings -----------------
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// load saved data and count number of entries for numberOfSections
let dataArrayTitles = riskItemDefaults.object(forKey: "newTry") as! [NSData]
let savedTitles = dataArrayTitles.map { RiskEntry(data: $0)! }
return savedTitles.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = self.tableView!.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! CellCustomized
cell.delegate = self
// load saved data and insert title in cell label
let dataArrayTitles = riskItemDefaults.object(forKey: "newTry") as! [NSData]
let savedTitles = dataArrayTitles.map { RiskEntry(data: $0)! }
cell.riskTitle.text = savedTitles[indexPath.row].title as String
return cell
}
// ---------------- delegate function from CustomCell -----------------
func transferData(consequencesTranferred: String, identifier: String) {
/// load entry
let dataArrayTitle = riskItemDefaults.object(forKey: "newTry") as! [NSData]
var savedTitle = dataArrayTitle.map { RiskEntry(data: $0)! }
riskItemDefaults.synchronize()
// CHECKPOINT: The entry is loaded correctly
print("loaded: ")
print(savedTitle)
/// filter entry for title contains identifier and update the empty string for consequences
if let index = savedTitle.index(where: {$0.title.contains(identifier)}) {
savedTitle[index].consequences = consequencesTranferred
let encoded = riskEntry.map { $0.encode() }
riskItemDefaults.set(encoded, forKey: "newTry")
riskItemDefaults.synchronize()
// CHECKPOINT: The entry is updated correctly
print("After updating for consequences: ")
print(savedTitle)
}else {
print ("No title with value identifier to be filtered")
}
}
}
CustomCell
// ----------- delegate to transfer entered data to VC ------------
protocol CustomCellUpdaterDelegate {
func transferData(consequencesTranferred: String, identifier: String)
}
// ---------------- start of calss CellCustomized -----------------
class CustomCell: UITableViewCell, UIPickerViewDataSource, UIPickerViewDelegate, UITextViewDelegate {
var myColorsClass = myColors()
var myStylesClass = myStyles()
var delegate: CustomCellUpdaterDelegate?
// text fields, text views and picker views
@IBOutlet weak var riskTitle: UITextView!
@IBOutlet weak var consequences: UITextView!
var nameIdentifier = String()
var textConsequences = String()
override func awakeFromNib() {
super.awakeFromNib()
// initiate textView delegate
consequences.delegate = self
} // nib end
// ---------------- listener for text view to save input in string when editing is finished -----------------
func textViewDidEndEditing(_ textView: UITextView) {
textConsequences = consequences.text
nameIdentifier = riskTitle.text
delegate?.transferData(consequencesTranferred: self.textConsequences, identifier: nameIdentifier)
}
}
