iosswiftcllocationcoordinate2d

How to fix 'When converting from string to CLLocationCoordinate2D."

I'm using decoder, And It will show me wrong answer, 1st line is a string, And the second one is I'm converting String to CLLocationCoordinate2D.

enter image description here

Why it makes 1st latitude and last longitude 0.0 ?

Question related to this is : Convert String of CLLocationCoordinate2D(s) into array

My requirement And I want output in this way and store it in let coordinates.

let coordinates = [
(-122.63748, 45.52214),
(-122.64855, 45.52218),
(-122.6545, 45.52219),
(-122.65497, 45.52196),
(-122.65631, 45.52104),
(-122.6578, 45.51935),
(-122.65867, 45.51848),
(-122.65872, 45.51293) ]

Encoding I'm encoding like this way, And encoding is 100% giving correct result.

 func encodeCoordinates(coords: [CLLocationCoordinate2D]) -> String {
//        let flattenedCoords: [String] = coords.map { coord -> String in "\(coord.latitude):\(coord.longitude)" }
        let flattenedCoords: [String] = coords.map { coord -> String in "\(coord.latitude):\(coord.longitude)"}
        let encodedString: String = flattenedCoords.joined(separator: ",")
        print("[\(encodedString)]")
        return encodedString
    }

It's Output is : enter image description here

Error in decoding

I'm decoding in this way. I'm using this code, It's same like as Convert String of CLLocationCoordinate2D(s) into array But not giving me correct result.

func decodeCoordinates(encodedString: String) -> [CLLocationCoordinate2D] {
    let flattenedCoords: [String] = encodedString.components(separatedBy: ",")
    let coords: [CLLocationCoordinate2D] = flattenedCoords.map { coord -> CLLocationCoordinate2D in
        let split = coord.components(separatedBy: ":")
        if split.count == 2 {
            let latitude: Double = Double(split[0]) ?? 0.0
            let longitude: Double = Double(split[1]) ?? 0.0
            return CLLocationCoordinate2D(latitude: latitude, longitude: longitude)
        } else {
            return CLLocationCoordinate2D()
        }
    }
    return coords
}

func makingRouteOfFreeRide(){

print("\n\n\n\n\n\n\n\n oooooo \(ProfileRoutesVC.map)\n\n\n\n\n\n\n\n\n",decodeCoordinates(encodedString: ProfileRoutesVC.map))
let a = decodeCoordinates(encodedString: ProfileRoutesVC.map)

enter image description here

Solution

  • In case your input string look like this:

    let yourCoordinateString = "[32.4945:74.5229,32.4945:74.5229,32.4945:74.5229]"

    func decodeCoordinates(encodedString: String) -> [CLLocationCoordinate2D] {
    var tmpString = encodedString
    tmpString.removeFirst(1)
    tmpString.removeLast(1)

    let flattenedCoords: [String] = tmpString.components(separatedBy: ",")
    let coords: [CLLocationCoordinate2D] = flattenedCoords.map { coord -> CLLocationCoordinate2D in
        let split = coord.components(separatedBy: ":")
        if split.count == 2 {
            let latitude: Double = Double(split[0]) ?? 0.0
            let longitude: Double = Double(split[1]) ?? 0.0
                return CLLocationCoordinate2D(latitude: latitude, longitude: longitude)
            } else {
                return CLLocationCoordinate2D()
            }
        }

        return coords
}