I'm currently trying to construct a way that calculates the the distance in feet between my current location and other hard coded locations. I will eventually display these distances as strings in a table view. These are the steps that I'm taking:
1) I have a hard coded library of dictionaries that each hold a "latitude" and "longitude" key-value pair.
2) to extract this information from a struct as follows:
struct BarDetials {
// other properties
....
var lat: CLLocationDegrees?
var long CLLocationDegrees?
init(index: Int) {
// initialize other properties
// ...
lat = specificBarDetail["latitude"] as! CLLocationDegrees!
long = specificBarDetail["longitude"] as! CLLocationDegrees!
}
}
3) I use another struct to create an array of CLLocation instances from these coordinates as follows:
struct ConstructLocationsToCompare {
var latitude : [CLLocationDegrees?] = []
var longitude : [CLLocationDegrees?] = []
var barLocations : [CLLocation?] = []
init(){
for index in 0...21 {
var data = BarDetails(index: index)
if data.lat != nil {
latitude.append(data.lat!)
}
if data.long != nil {
longitude.append(data.long!)
}
barLocations[index] = CLLocation(latitude: latitude[index]!, longitude: longitude[index]!)
}
}
}
4) I then calculate the distances in my MasterViewController().
var latestLocation : AnyObject? , var currentLocation : CLLocation!, and var distanceStringArray : [String?] = [] are all properties of my MasterViewController() class.
func locationManager(manager: CLLocationManager!, didUpdateLocations locations: [AnyObject]!) {
CLGeocoder().reverseGeocodeLocation(manager.location, completionHandler: { (placemarks, error) -> Void in
// Get latest location and store it as a property of MasterViewController
if self.latestLocation != nil {
self.latestLocation = locations[locations.count - 1]
// Print out the latest locaiton for debuging
println("Latest Location")
println("---------------")
println(self.latestLocation)
// Create an instance of ContructLocationsToCompare to get all locaiton data
var getBarLocations = ConstructLocationsToCompare()
// Get loop to calculate the distance you are away from each Bar
var distanceDoubleArray : [Double?] = []
for index in 0...21 {
var distanceBetween : CLLocationDistance = self.latestLocation!.distanceFromLocation(getBarLocations.barLocations[index])
var distanceInFeet = distanceBetween * 3.28084
distanceDoubleArray[index] = distanceInFeet
self.distancesStringArray.append( String(format: "%6.0 ft", distanceDoubleArray[index]!))
}
}
//println(distanceBetween) or get error if it exists
if error != nil {
println("Error: " + error.localizedDescription)
return
}
if placemarks.count > 0 {
let pm = placemarks[0] as! CLPlacemark
self.displayLocationInfo(pm)
}
})
}
5) Lastly, to display my distance from each location (in my -cellForRowAtIndexPath):
println("")
println("")
println("List of Locations")
println("=================")
println(self.distancesStringArray)
println("")
println("")
println("")
println("")
if self.distancesStringArray[indexPath.row]!.isEmpty == true{
futureCell.distanceAway?.text = "-" // I crash at this line ^^^^^^
} else {
futureCell.distanceAway?.text = self.distancesStringArray[indexPath.row]
}
*** My distanceStringArray is always empty therefore I get a fatal error and the app crashes. How do I fix this? Is the fact that I declare var latestLocation : AnyObject? , var currentLocation : CLLocation!, and var distanceStringArray : [String?] = [] properties of my MasterViewController() class bad practice? If not do these properties need to be casted as a different type/ declared in a different manner?
