Update label text in Viewcontroller from Tableview - ios

Question

My question is similar to the one as here: Update label.text at runtime
I have a viewcontroller that contains a tableview with some textfields. When the user enters the quantity and amount in the perspective textfields I want to update a label outside the tableview after I press return on the final keyboard during at runtime
After doing some research I realize that this will get some in the textfieldDidEndEditing function of the textfield delegate in the cell itself but how will i access the label text from the viewcontroller so that i can update it? I will provide the code I have below.
import UIKit
import RealmSwift
class MaterialsCell: UITableViewCell, UITextFieldDelegate{
#IBOutlet weak var materialsDescription: UITextField!
#IBOutlet weak var materialsQuantity: UITextField!
#IBOutlet weak var materialsAmount: UITextField!
func saveMaterialsData() {
let saveMaterials = SPMaterialsRequest()
saveMaterials.setValue(self.materialsDescription!.text, forKey: "materialDescriptiopn")
saveMaterials.setValue(self.materialsQuantity!.text, forKey: "materialQuantity")
saveMaterials.setValue(self.materialsAmount!.text, forKey: "materialAmount")
let realm = try! Realm()
do {
try realm.write {
realm.add(saveMaterials)
print("added \(saveMaterials.materialDescription) to Realm Database")
print("added \(saveMaterials.materialQuantity) to Realm Database")
print("added \(saveMaterials.materialAmount) to Realm Database")
print("added \(saveMaterials.materialTotal) to Realm Database")
}
} catch {
print(error)
}
}
override func awakeFromNib() {
super.awakeFromNib()
// Initialization code
}
override func setSelected(_ selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
// Configure the view for the selected state
}
func textFieldDidEndEditing(_ textField: UITextField) {
}
}
import UIKit
import RealmSwift
class ServiceProMaterialsController: UIViewController, UITableViewDataSource, UITableViewDelegate {
#IBOutlet weak var materialsView: UITableView!
#IBOutlet weak var materialsTotal: UILabel!
var spMaterialsRequest: Results<SPMaterialsRequest>?
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 1
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cellIdentifier = "MaterialsCell"
guard let cell = tableView.dequeueReusableCell(withIdentifier: cellIdentifier, for: indexPath) as? MaterialsCell
else {
fatalError("Dequed Cell is not an instance of MaterialsCell")
}
cell.materialsDescription.text = ""
cell.materialsQuantity.text = ""
cell.materialsAmount.text = ""
return cell
}
}

Answer 1

Create a custom delegate, implement that delegate in your viewcontroller. Pass the delegate to the cell while dequeuing the cell and calling that delegate in textFieldDidEndEditing, like :
import UIKit
import RealmSwift
protocol CustomProtocol{
func textEntered(text : String,index:Int)
}
class MaterialsCell: UITableViewCell, UITextFieldDelegate{
#IBOutlet weak var materialsDescription: UITextField!
#IBOutlet weak var materialsQuantity: UITextField!
#IBOutlet weak var materialsAmount: UITextField!
var delegate : CustomProtocol?
var index : Int?
func saveMaterialsData() {
let saveMaterials = SPMaterialsRequest()
saveMaterials.setValue(self.materialsDescription!.text, forKey: "materialDescriptiopn")
saveMaterials.setValue(self.materialsQuantity!.text, forKey: "materialQuantity")
saveMaterials.setValue(self.materialsAmount!.text, forKey: "materialAmount")
let realm = try! Realm()
do {
try realm.write {
realm.add(saveMaterials)
print("added \(saveMaterials.materialDescription) to Realm Database")
print("added \(saveMaterials.materialQuantity) to Realm Database")
print("added \(saveMaterials.materialAmount) to Realm Database")
print("added \(saveMaterials.materialTotal) to Realm Database")
}
} catch {
print(error)
}
}
override func awakeFromNib() {
super.awakeFromNib()
// Initialization code
}
override func setSelected(_ selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
// Configure the view for the selected state
}
func textFieldDidEndEditing(_ textField: UITextField) {
//Usage of custom protocol
delegate?.textEntered(text : textField.text!,index:self.index!)
}
}
import UIKit
import RealmSwift
class ServiceProMaterialsController: UIViewController, UITableViewDataSource, UITableViewDelegate , CustomProtocol{
#IBOutlet weak var materialsView: UITableView!
#IBOutlet weak var materialsTotal: UILabel!
var spMaterialsRequest: Results<SPMaterialsRequest>?
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 1
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cellIdentifier = "MaterialsCell"
guard let cell = tableView.dequeueReusableCell(withIdentifier: cellIdentifier, for: indexPath) as? MaterialsCell
else {
fatalError("Dequed Cell is not an instance of MaterialsCell")
}
//Do 1 and 2
cell.delegate = self // 1
cell.index = indexPath.row //2
cell.materialsDescription.text = ""
cell.materialsQuantity.text = ""
cell.materialsAmount.text = ""
return cell
}
//Implementing CustomProtocol
func textEntered(text : String,index:Int){
materialsTotal.text = text
}
}