Updating Tableview Cells with a Button in swift - ios

Question

Hello everybody i was wonder if you can update the cells inside of a button? Ive have the code where the button is pressed and it gets your lat/lng and print them out, but now i'm trying to update the Lat and Lng cells in my other swift file CoordinatesAltitudeDegreesTableViewCell.swift
as of now my tableview functions seem to work and i tested updating the cell in the function in the viewController and it works.
My question is anyway to put those functions in the button so the lat/lng variables are in scope
Sidenote: ive been looking for solutions for two days and i could seem to find any page that helped me, hopefully this isnt a repost and if there is then sorry in advance
*again, sorry i am very new to swift programming
import UIKit
import Alamofire
import SwiftyJSON
import CoreLocation
import MapKit
class myTableViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, CLLocationManagerDelegate{
//----------------------
// Buttons and Variables
//----------------------
var lastLocation: CLLocation? = nil
#IBOutlet weak var tableView: UITableView!
#IBAction func generateInfo(sender: AnyObject) {
locationManager.requestWhenInUseAuthorization()
locationManager.startUpdatingLocation()
let lat: Double! = lastLocation?.coordinate.latitude
let lng: Double! = lastLocation?.coordinate.longitude
let alt: Double! = lastLocation?.altitude
print(lat)
print(lng)
print(alt)
locationManager.stopUpdatingLocation()
} // end of button
//--------------
// Main Function
//--------------
override func viewDidLoad(){
super.viewDidLoad()
print("Hello World")
self.tableView.dataSource = self
self.tableView.delegate = self
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
//-------------------
// LOCATION FUNCTIONS
//-------------------
// Represents Location Manager
lazy var locationManager: CLLocationManager = {
let manager = CLLocationManager()
manager.delegate = self
manager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters
return manager
}()
// Location Authorization Function
func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus){
if case .authorizedWhenInUse = status {
manager.requestLocation()
} else {
print("yeah... that didn't work")
}
}
// Location Error handle
func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
print("that didn't work")
}
// Location Object
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]){
if let location = locations.first {
lastLocation = location
}
}
//--------------------
// TABLEVIEW FUNCTIONS
//--------------------
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 10
}
public func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
if indexPath.row == 0 {
let cell = tableView.dequeueReusableCell(withIdentifier: "imageCellCustomCell", for: indexPath) as! ImageCellTableViewCell
return cell
}
else if indexPath.row == 1{
let cell = self.tableView.dequeueReusableCell(withIdentifier: "coordinatesAltitudeDegreesCustomCell", for: indexPath) as! CoordinatesAltitudeDegreesTableViewCell
cell.latLabel.text = "text"
return cell
}
else if indexPath.row == 2{
let cell = tableView.dequeueReusableCell(withIdentifier: "censusGeographyCustomCell", for: indexPath) as! CensusGeographyTableViewCell
return cell
}
else if indexPath.row == 3{
let cell = tableView.dequeueReusableCell(withIdentifier: "nearestAddressCustomCell", for: indexPath) as! NearestAddressTableViewCell
return cell
}
else if indexPath.row == 4{
let cell = tableView.dequeueReusableCell(withIdentifier: "populationCustomCell", for: indexPath) as! PopulationTableViewCell
return cell
}
else if indexPath.row == 5{
let cell = tableView.dequeueReusableCell(withIdentifier: "ethnicityCustomCell", for: indexPath) as! EthnicityTableViewCell
return cell
}
else if indexPath.row == 6{
let cell = tableView.dequeueReusableCell(withIdentifier: "raceCustomCell", for: indexPath) as! RaceTableViewCell
return cell
}
else if indexPath.row == 7{
let cell = tableView.dequeueReusableCell(withIdentifier: "ageCustomCell", for: indexPath) as! AgeTableViewCell
return cell
}
else if indexPath.row == 8{
let cell = tableView.dequeueReusableCell(withIdentifier: "populationPyramidCustomCell", for: indexPath) as! PopulationPyramidTableViewCell
return cell
}
else {
let cell = tableView.dequeueReusableCell(withIdentifier: "houseHoldCustomCell", for: indexPath) as! HouseHoldTableViewCell
return cell
}
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
if indexPath.row == 0 {
return 300
}
else if indexPath.row == 1{
return 130
}
else if indexPath.row == 2{
return 100
}
else if indexPath.row == 3{
return 100
}
else if indexPath.row == 4{
return 90
}
else if indexPath.row == 5{
return 110
}
else if indexPath.row == 6{
return 200
}
else if indexPath.row == 7{
return 300
}
else if indexPath.row == 8{
return 300
}
else {
return 360
}
}
}

Answer 1

You should have variables inside your class for lat, long, alt and in your CoordinatesAltitudeDegreesTableViewCell you also should have those variables.
So for example here's a code snippet.
class SomeViewController: UIViewController {
// Set these attributes here cause they will be used as your source of data for the UITableViewCell
var lat: Int = 0
var lon: Int = 0
var alt: Int = 0
#IBOutlet var tableView: UITableView!
#IBOutlet var someButton: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
someButton.addTarget(self, action: #selector(self.someButtonClicked(_:)), forControlEvents: .TouchUpInside)
}
func someButtonClicked(sender: UIButton) {
lat = 100 // set to different values
lon = 10 // set to different values
alt = 30 // set to different values
// when you reload the tableView all the `UITableViewDelegate, UITableViewDataSource` codes will be called again therefore refreshing your cells.
tableView.reloadData()
}
}
extension SomeViewController: UITableViewDelegate, UITableViewDataSource {
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "SomeCustomCell", for: indexPath) as! SomeCustomCell
// set the parameters
cell.lat = self.lat
cell.lon = self.lon
cell.alt = self.atl
return cell
}
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 1
}
}
class SomeCustomCell: UITableViewCell {
var lat: Int = 0 {
didSet { // just in case you don't know about didSet there's an explanation below
lblLat.text = "\(lat)"
}
}
var lon: Int = 0 {
didSet {
lblLon.text = "\(lon)"
}
}
var alt: Int = 0 {
didSet {
lblAlt.text = "\(alt)"
}
}
... insert some ui objects here
#IBOutlet var lblLat: UILabel!
#IBOutlet var lblLon: UILabel!
#IBOutlet var lblAlt: UILabel!
... insert some ui objects here
override func awakeFromNib() {
super.awakeFromNib()
}
override func setSelected(selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
}
}
There are a multitude of ways to do this, but this is the simplest one I can think of.
didSet explanation
var someVariable: <SomeDataType> = <SomeValue> {
didSet {
// this block is called whenever this variable's value is changed (i.e someVariable)
}
}
for example:
var name: String = "" {
didSet {
print(name)
}
}
init() {
name = "Capaldi"
name = "Tennant"
name = "Smith"
name = "Eccleston"
}
In your debugger it would output something like this since didSet was called each time you set the name
Capaldi
Tennant
Smith
Eccleston