Sort cell input from customized cell in viewController - ios

Question

I have a ViewController in which a tableView and a button "sort" is integrated.
The cells of this tableView are customized in another class called "customizedCell".
When the ViewController is loaded, a label (riskTitle: UITextView! in CellCustomized) in the tableView is filled with the items stored in the array (RiskTitles_Plan = String in ViewController). My code below has some values hard coded for this array.
What I am trying to do now is to store the numbers generated by two pickerViews in the label "riskFactor: UILabel!" in an array (RiskFactor_Plan -> RiskFactor_Int). When the user clicks on the button sort, the values in my array have to be sorted and the rows in the tableView will be loaded in a new order (smallest to biggest number or vise versa).
This is my code (unnecessary code is deleted).
Swift 3 - ViewController:
import UIKit
class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
var RiskTitles_Plan = [String]()
var RiskFactor_Plan = [String]()
var RiskFactor_Plan_Int = [Int]()
var sortBtn = UIButton()
override func viewDidLoad() {
super.viewDidLoad()
RiskTitles_Plan = ["my cat","my dog","my sheep","my cow","my fish"]
sortBtn.setImage(UIImage(named: "Sort"), for: UIControlState.normal)
sortBtn.addTarget(self, action: #selector(RiskPlan.sortAction(_:)), for: .touchUpInside)
self.view.addSubview(sortBtn)
}
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return RiskTitles_Plan.count
}
/////// Here comes the interesting part ///////
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = self.tableView!.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! CellCustomized
RiskFactor_Plan.append(cell.riskFactor.text!)
cell.riskTitle?.text = RiskTitles_Plan[indexPath.row]
cell.backgroundColor = myColorsClass.darkCyan()
for i in RiskFactor_Plan_Int {
let stringItem: String = String(i)
RiskFactor_Plan.append(stringItem)
}
cell.riskFactor.text! = RiskFactor_Plan[indexPath.row]
return cell
}
func sortAction(_ sender:UIButton!) {
for i in RiskFactor_Plan {
let intItem: Int = Int(i)!
RiskFactor_Plan_Int.append(intItem)
}
RiskFactor_Plan_Int = RiskFactor_Plan_Int.sorted{ $0 < $1 }
tableView.reloadData()
}
}
Swift 3 - CellCustomized:
import UIKit
class CellCustomized: UITableViewCell {
var myColorsClass = myColors()
var myStylesClass = myStyles()
#IBOutlet weak var riskTitle: UITextView!
#IBOutlet weak var riskFactor: UILabel!
override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
super.init(style: style, reuseIdentifier: reuseIdentifier) // the common code is executed in this super call
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
}
override func awakeFromNib() {
super.awakeFromNib()
} // nib end
}
The code above results in the error fatal error: unexpectedly found nil while unwrapping an Optional value for code line: let intItem: Int = Int(i)! in ViewController when the sort button in clicked.
My problem is to figure out
how to save the generated values in riskFactor: UILabel! in an array (-> RiskTitles_Plan = String) during runtime. I guess the array needs to be appended whenever the label in the table is updated with a generated value
how to convert the string array (-> RiskTitles_Plan = String) to an integer array (-> RiskTitles_Plan_Int = Int)

Answer 1

Based on the context of your problem I tried to replicate in a project so this is how I do it, hopefully it can help you.
Result:
Code:
class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource{
#IBOutlet weak var tableView: UITableView!
var risks = Array<(title: String, factor: Int)>()
override func viewDidLoad() {
super.viewDidLoad()
tableView.delegate = self
tableView.dataSource = self
risks.append(("my cat", 0))
risks.append(("my dog", 0))
risks.append(("my sheep", 0))
risks.append(("my cow", 0))
risks.append(("my fish", 0))
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return risks.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! TableViewCell
let riskTitle = risks[indexPath.row].title
let riskFactor = risks[indexPath.row].factor
cell.titleLabel.text = riskTitle
cell.factorLabel.text = String(riskFactor)
cell.index = indexPath.row
cell.onFactorValueChanged = { [unowned self] newFactorValue, atIndex in
self.risks[atIndex].factor = newFactorValue
}
return cell
}
#IBAction func sortRisksBasedOnFactor(_ sender: AnyObject) {
risks.sort { (riskA, riskB) -> Bool in
return riskA.factor > riskB.factor
}
tableView.reloadData()
}
}
class TableViewCell: UITableViewCell {
#IBOutlet weak var titleLabel: UILabel!
#IBOutlet weak var factorLabel: UILabel!
var index = 0
var onFactorValueChanged: (Int, Int) -> Void = { _ in }
#IBAction func generateFactor(_ sender: AnyObject) {
factorLabel.text = String(random(min: 1, max: 10))
onFactorValueChanged(Int(factorLabel.text!)!, index)
}
func random(min: Int, max: Int) -> Int {
guard min < max else {return min}
return Int(arc4random_uniform(UInt32(1 + max - min))) + min
}
}