Swift: Send data from a UITableView to UIViewController - ios

Question

I have a list of Cities in a TableView and want to pass the data from the cell in TableView to a UIViewController. Now when I pass the data I also want to pass the Latitude and Longitude of those Cities to the UIViewController. Here is the TableViewController code.
class MasterTableViewController: UITableViewController
{
let fruits = ["London", "Melbourne", "Singapore", "Brazil", "Germany", "Monza", "Dallas", "Auckland", "Brussels", "Shanghai", "Sepang", "Barcelona"]
override func awakeFromNib() {
super.awakeFromNib()
}
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.
}
// MARK: - Segues
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "showDetail" {
if let indexPath = self.tableView.indexPathForSelectedRow() {
let fruit = fruits[indexPath.row]
(segue.destinationViewController as! ViewController).detailItem = fruit
}
}
}
// MARK: - Table View
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return fruits.count
}
override func tableView(tableView: UITableView, didDeselectRowAtIndexPath indexPath: NSIndexPath) {
if (indexPath.row == 0){
}
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath) as! UITableViewCell
let fruit = fruits[indexPath.row]
cell.textLabel!.text = fruit
return cell
}
override func tableView(tableView: UITableView, canEditRowAtIndexPath indexPath: NSIndexPath) -> Bool {
// Return false if you do not want the specified item to be editable.
return true
}
}
I can pass City but how would you pass the latitude of the longitude of the cities to the UIViewController. Here is the code for the UIViewController.
class ViewController: UIViewController {
#IBOutlet weak var currentTemperatureLabel: UILabel?
#IBOutlet weak var currentHumidityLabel: UILabel?
#IBOutlet weak var currentPrecipitationLabel: UILabel?
#IBOutlet weak var currentWeatherIcon: UIImageView?
#IBOutlet weak var currentWeatherSummary: UILabel?
#IBOutlet weak var refreshButton: UIButton?
#IBOutlet weak var activityIndicator: UIActivityIndicatorView?
#IBOutlet weak var detailDescriptionLabel: UILabel?
// Location coordinates
let coordinate: (lat: Double, lon: Double) = (37.8267,-122.423)
// TODO: Enter your API key here
private let forecastAPIKey = ""
var detailItem: AnyObject? {
didSet {
// Update the view.
self.configureView()
}
}
func configureView() {
if let detail: AnyObject = self.detailItem {
if let label = self.detailDescriptionLabel {
label.text = detail.description
}
}
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.configureView()
retrieveWeatherForecast()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func retrieveWeatherForecast() {
let forecastService = ForecastService(APIKey: forecastAPIKey)
forecastService.getForecast(coordinate.lat, lon: coordinate.lon) {
(let currently) in
if let currentWeather = currently {
dispatch_async(dispatch_get_main_queue()) {
if let temperature = currentWeather.temperature {
self.currentTemperatureLabel?.text = "\(temperature)º"
}
if let humidity = currentWeather.humidity {
self.currentHumidityLabel?.text = "\(humidity)%"
}
if let precipitation = currentWeather.precipProbability {
self.currentPrecipitationLabel?.text = "\(precipitation)%"
}
if let icon = currentWeather.icon {
self.currentWeatherIcon?.image = icon
}
if let summary = currentWeather.summary {
self.currentWeatherSummary?.text = summary
}
self.toggleRefreshAnimation(false)
}
}
}
}
#IBAction func refreshWeather() {
toggleRefreshAnimation(true)
retrieveWeatherForecast()
}
func toggleRefreshAnimation(on: Bool) {
refreshButton?.hidden = on
if on {
activityIndicator?.startAnimating()
} else {
activityIndicator?.stopAnimating()
}
}
}

Answer 1

Add a property for the location to ViewController.
You can then pass the city's location in MasterTableViewController prepareForSegue, similar to how you're passing the city (detailItem) now.
Update:
To pass another parameter, you would add it to your ViewController
var coordinateItem: AnyObject? {
didSet {
// Update the view.
self.configureView()
}
}
and then pass it in prepareForSegue
(segue.destinationViewController as! ViewController).coordinateItem = location
Update 2:
Yes, you can initialize an array of coordinates, and pass a latitude and longitude coordinate.
var locations : [[Double]] = [[51.50722, -0.12750], [-37.8136, 144.9631], ...]
In this case, your coordinateItem would be a [Double].
You can access the two doubles by coordinateItem[0] and coordinateItem[1]
The general concept is the same, regardless of whether you're passing an array or a String.