Converting Int to String in Swift - ios

Question

var duration = waveFnList.waves[indexPath.row].duration
if let _duration = String(duration) {
viewDuration = _duration
} else {
viewDuration = ""
}
I'm trying to convert duration (of type Int) to a String using String(duration). I am getting an error:
Could not find an overload for 'init' that accepts the supplied arguments
EDIT: I will post more of the code for a better understanding:
GLOBAL:
import Foundation
var waveFnList: WaveFunctionList = WaveFunctionList()
var viewName:String = ""
var viewDuration:String = ""
var viewPeriod:String = ""
var viewMinAmp:String = ""
var viewMaxAmp:String = ""
var viewStep:String = ""
var viewType:String = ""
var waveTypes: [Int: String] = [
0: "Sine",
1: "Saw",
2: "Square",
3: "Triangle",
4: "Flat"
]
struct WaveFunction {
var name: String?
var duration: Int?
var period: Int?
var minAmp: Int?
var maxAmp: Int?
var step: Int?
var type: Int?
}
class WaveFunctionList: NSObject {
var waves = [WaveFunction]()
func addWave(name: String, duration: Int, period: Int, minAmp: Int, maxAmp: Int, step: Int, type: Int) {
waves.append(WaveFunction(name: name, duration: duration, period: period, minAmp: minAmp, maxAmp: maxAmp, step: step, type: type))
}
}
FIRST VIEW CONTROLLER
import UIKit
class FirstViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
#IBOutlet var tblWaveFunctions: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
//Returning to view
override func viewWillAppear(animated: Bool) {
tblWaveFunctions.reloadData()
}
//UITableViewDelete
func tableView(tableView: UITableView!, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath!) {
if (editingStyle == UITableViewCellEditingStyle.Delete) {
waveFnList.waves.removeAtIndex(indexPath.row)
tblWaveFunctions.reloadData()
}
}
//UITableViewDataSource
func tableView(tableView: UITableView!, numberOfRowsInSection section: Int) -> Int {
return waveFnList.waves.count
}
//Cell data
func tableView(tableView: UITableView!, cellForRowAtIndexPath indexPath: NSIndexPath!) -> UITableViewCell! {
let cell: UITableViewCell = UITableViewCell(style:UITableViewCellStyle.Subtitle, reuseIdentifier: "test")
cell.textLabel.text = waveFnList.waves[indexPath.row].name
cell.detailTextLabel.text = waveTypes[waveFnList.waves[indexPath.row].type!]
return cell
}
func tableView(tableView: UITableView!, didSelectRowAtIndexPath indexPath: NSIndexPath!) {
// Get the row data for the selected row
/*
var alert: UIAlertView = UIAlertView()
alert.title = waveFnList.waves[indexPath.row].name
alert.message = waveTypes[waveFnList.waves[indexPath.row].type!]
alert.addButtonWithTitle("Ok")
alert.show()
*/
if let _name = waveFnList.waves[indexPath.row].name {
viewName = _name
} else {
viewName = ""
}
var duration = waveFnList.waves[indexPath.row].duration
if let _duration = String(duration) {
viewDuration = _duration
} else {
viewDuration = ""
}
var period = waveFnList.waves[indexPath.row].period
if let _period = String(period) {
viewPeriod = _period
} else {
viewPeriod = ""
}
var min_Amp = waveFnList.waves[indexPath.row].minAmp
if let _min_Amp = String(min_Amp) {
viewMinAmp = _min_Amp
} else {
viewMinAmp = ""
}
var max_Amp = waveFnList.waves[indexPath.row].maxAmp
if let _max_Amp = String(max_Amp) {
viewMaxAmp = _max_Amp
} else {
viewMaxAmp = ""
}
var step = waveFnList.waves[indexPath.row].step
if let _step = String(step) {
viewStep = _step
} else {
viewStep = ""
}
var type = waveFnList.waves[indexPath.row].step
if let _type = String(type) {
viewType = _type
} else {
viewType = ""
}
self.tabBarController.selectedIndex = 1 //go back to firstView
}
}
SECOND VIEW CONTROLLER
import UIKit
class SecondViewController: UIViewController, UITextFieldDelegate {
#IBOutlet var txtName: UITextField!
#IBOutlet var txtDuration: UITextField!
#IBOutlet var txtPeriod: UITextField!
#IBOutlet var txtMinAmp: UITextField!
#IBOutlet var txtMaxAmp: UITextField!
#IBOutlet var txtStep: UITextField!
#IBOutlet var txtType: UITextField!
override func loadView() {
println("despues")
println(viewName)
setInfo(viewName, duration: viewDuration, period: viewPeriod, minAmp: viewMinAmp, maxAmp: viewMaxAmp, step: viewStep, type: viewType)
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
//Events
#IBAction func btnAddWaveFunction_Click(sender: UIButton) {
waveFnList.addWave(txtName.text, duration: txtDuration.text.toInt()!, period: txtPeriod.text.toInt()!, minAmp: txtMinAmp.text.toInt()!, maxAmp: txtMaxAmp.text.toInt()!, step: txtStep.text.toInt()!, type: txtType.text.toInt()!)
self.view.endEditing(true) //hide keyboard
txtName.text = ""
txtDuration.text = ""
txtPeriod.text = ""
txtMinAmp.text = ""
txtMaxAmp.text = ""
txtStep.text = ""
txtType.text = ""
self.tabBarController.selectedIndex = 0 //go back to firstView
}
//iOS Touch Functions
override func touchesBegan(touches: NSSet!, withEvent event: UIEvent!) {
self.view.endEditing(true)
}
//UITextField Delegate
//Hide keyboard when click return
func textFieldShouldReturn(textField: UITextField!) -> Bool {
textField.resignFirstResponder()
return true
}
func setInfo(name: String?, duration: String, period: String, minAmp: String, maxAmp: String, step: String, type: String) {
txtName.text = name
txtDuration.text = duration
txtPeriod.text = period
txtMinAmp.text = minAmp
txtMaxAmp.text = maxAmp
txtStep.text = step
txtType.text = type
}
}

Answer 1

String cannot init with Int?, but it can with Int. Since String(int:Int) doesn't return an optional, you can get the effect you want with the same amount of code:
if let _duration = duration {
viewDuration = String(_duration)
} else {
viewDuration = ""
}

Answer 2

Also, try below code :
if let _duration = duration {
viewDuration = _duration.integerValue
} else {
viewDuration = ""
}
I hope, these works for you . . .