I'm working on an app Witch has a list of places (added by the user) and a map view with a button to add the users curent location. the app works to this point. When the user taps on a place in the tableView the app should go to the mapView and show the place on the map with a pin . but when I do that the app crashes and gives me the following error unless the user has renamed the place and if they have, it works perfectly :
fatal error: unexpectedly found nil while unwrapping an Optional value
(lldb)
note that the crash occurs in the mapView on the line that says:
let latitude = NSString(string: places[activePlace]["lat"]!).doubleValue
and that the
print("activePlace current value is \(activePlace)")
returns the number of the line in the TableView
How could I solve this? thanks !
Here is the code in the TableView:
import UIKit
var places = [Dictionary<String,String>()]
var activePlace = -1
class TableViewController: UITableViewController {
func companyNameUpdatedAlert(title: String, error: String, indexPath: Int) {
let alert = UIAlertController(title: title, message: error, preferredStyle: UIAlertControllerStyle.Alert)
alert.addTextFieldWithConfigurationHandler { (textField) -> Void in
textField.placeholder = "Enter new text"
}
alert.addAction(UIAlertAction(title: "OK", style: .Default, handler: { (action) -> Void in
let lat = places[indexPath]["lat"]!
let lon = places[indexPath]["lon"]!
places.removeAtIndex(indexPath)
places.insert(["name" : alert.textFields![0].text!, "lat" : lat, "lon" : lon], atIndex: indexPath)
self.tableView.reloadData()
NSUserDefaults.standardUserDefaults().setObject(places, forKey: "places")
NSUserDefaults.standardUserDefaults().synchronize()
}))
self.presentViewController(alert, animated: true, completion: nil)
}
override func tableView(tableView: UITableView, editActionsForRowAtIndexPath indexPath: NSIndexPath) -> [UITableViewRowAction]? {
let changeText = UITableViewRowAction(style: UITableViewRowActionStyle.Default, title: "Change text" , handler: { (action:UITableViewRowAction, indexPath:NSIndexPath) -> Void in
self.companyNameUpdatedAlert("Update text", error: "enter text below", indexPath: indexPath.row)
})
let deleteAction = UITableViewRowAction(style: UITableViewRowActionStyle.Default, title: "Delete" , handler: { (action:UITableViewRowAction, indexPath:NSIndexPath) -> Void in
places.removeAtIndex(indexPath.row)
tableView.reloadData()
NSUserDefaults.standardUserDefaults().setObject(places, forKey: "places")
NSUserDefaults.standardUserDefaults().synchronize()
})
return [changeText, deleteAction]
}
override func viewDidLoad() {
//save start
if NSUserDefaults.standardUserDefaults().objectForKey("places") != nil {
places = NSUserDefaults.standardUserDefaults().objectForKey("places") as! [Dictionary]
//test
NSUserDefaults.standardUserDefaults().setObject(places, forKey: "places")
NSUserDefaults.standardUserDefaults().synchronize()
//save stop
super.viewDidLoad()
if places.count == 1 {
places.removeAtIndex(0)
places.append(["name":"go to map to add location","lat":"90","lon":"90"])
}
if NSUserDefaults.standardUserDefaults().objectForKey("places") != nil {
places = NSUserDefaults.standardUserDefaults().objectForKey("places") as! [Dictionary]
}
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return places.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath) as UITableViewCell
cell.textLabel?.text = places[indexPath.row]["name"]
return cell
}
override func tableView(tableView: UITableView, willSelectRowAtIndexPath indexPath: NSIndexPath) -> NSIndexPath? {
activePlace = indexPath.row
return indexPath
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "newPlace" {
activePlace = -1
}
}
override func viewWillAppear(animated: Bool) {
tableView.reloadData()
}
}
and here is the code in the viewController ( mapView)
if activePlace == -1 {
manager.requestWhenInUseAuthorization()
manager.startUpdatingLocation()
} else {
print("activePlace current value is \(activePlace)")
let latitude = NSString(string: places[activePlace]["lat"]!).doubleValue
let longitude = NSString(string: places[activePlace]["lon"]!).doubleValue
let coordinate = CLLocationCoordinate2DMake(latitude, longitude)
let latDelta:CLLocationDegrees = 0.01
let lonDelta:CLLocationDegrees = 0.01
let span:MKCoordinateSpan = MKCoordinateSpanMake(latDelta, lonDelta)
let region:MKCoordinateRegion = MKCoordinateRegionMake(coordinate, span)
self.Map.setRegion(region, animated: true)
let annotation = MKPointAnnotation()
annotation.coordinate = coordinate
annotation.title = places[activePlace]["name"]
self.Map.addAnnotation(annotation)
print("activePlaces current value is (activePlaces)")
