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Start your free trialBrian Patterson
19,588 PointsA general question about tableViews and the Weather app.
This is question with regards to an App that I am building in that 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"]
let locations: [[Double]] = [[51.50722, -0.12750],[-37.8136, 144.9631],[-23.5475000,-46.6361100],[49.3297,8.57428],[45.58005,9.27246]]
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]
let location = locations[indexPath.row]
(segue.destinationViewController as! ViewController).detailItem = fruit
(segue.destinationViewController as! ViewController).coordinateItem = location
}
}
}
// 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
}
} The problem I am having is in in the UIViewController. Here is the code. 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
var coordinate: (lat: Double, lon: Double) = (37.8267,-122.423)
// TODO: Enter your API key here
private let forecastAPIKey = "f0d72abfce6f28e736388c289376e0c9"
var coordinateItem: AnyObject? {
didSet {
// Update the view.
self.configureView()
}
}
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)ΒΊ"
}
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()
}
}
} Please can someone help me with this. I have tried StackOverflow and they were not helpful. The advice was read the manual.
1 Answer
Richard Lu
20,185 PointsIn your table view controller, change locations into tuple values instead of arrays. There is a method that automatically gets called when segueing from one view controller to another called prepareForSegue which you used.
I've modified this for you and this should work.
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "showDetail" {
if let vc = segue.destinationViewController as? ViewController {
vc.coordinates = //place which coordinates you'd like to place in
}
}
}
Note
When you access IBOutlets in prepareForSegue, they aren't created yet. You may want to change these two lines
(segue.destinationViewController as! ViewController).detailItem = fruit
(segue.destinationViewController as! ViewController).coordinateItem = location
or your property observers.