I am currently building a public transportation app in SwiftUI Xcode 12 beta, where you input origin, destination, time of arrival, and date. The idea is to then convert the origin and destination input (private func FetchOriginCoordinates and private func FetchDestCoordinates) into coordinates using an API. This API will then give that data to another API that plans the route.
The problem is that the route planner API doesn't give any output. I have tried printing self.Trips.append(...) but the list is completely empty. I believe this is because the code doesn't reach that part of the code. I have put some print statements in the code in order to understand where the error is occurring. When I call the API my output in the console is this:
Test 2021-04-16 22:33:19.271246+0200 OnTrack2.0[6592:428359] [] nw_protocol_get_quic_image_block_invoke dlopen libquic failed Optional(http://api.sl.se/api2/TravelplannerV3_1/trip.json?key=40892db48b394d3a86b2439f9f3800fd&originExtId=300101115&destExtId=300101426&Date=2021-04-18&Time=09:20&searchForArrival=1) [] 10767 bytes Level 1 Level 1.5
This means that the code only reaches the print("Level 1.5") statement. But never the following print statements such as print("Level 2") or print(self.trips). Why is that and how do I solve it?
import Foundation
struct NominationStructure: Decodable {
var lat: String
var lon: String
enum CodingKeys: String, CodingKey {
case lat = "lat"
case lon = "lon"
}
}
struct NearbyStopsStructure: Decodable {
var stopLocationOrCoordLocation: [stopLocationOrCoordLocationStructure]
}
struct stopLocationOrCoordLocationStructure: Decodable {
var StopLocation: StopLocationStructure
}
struct StopLocationStructure: Decodable {
var mainMastExtId: String
}
struct JSONStructure: Decodable {
var Trip: [TripStructure]
}
struct TripStructure: Decodable {
var LegList: LegListStructure
}
struct LegListStructure: Decodable {
var Leg: [LegStructure]
}
struct LegStructure: Decodable {
var Origin: StationStructure
var Destination: StationStructure
var Product: ProductStructure
var name: String
var type: String
var dist: String
}
struct StationStructure: Decodable {
var time: String
var name: String
var date: String
}
struct ProductStructure: Decodable {
var catIn: String
}
struct LocationInfo {
var iD = String()
var input = String()
var lat = String()
var lon = String()
var name = String()
var time = String()
var date = String()
var vehicleType = String()
var transportType = String()
var dist = String()
var legName = String()
}
//One way is to call your functions when you know a step is completed
enum TripFetchStatus: String {
case start
case fetchedOriginCoordinates
case fetchedOriginId
case fetchedDestinationCoordinates
case fetchedDestinationId
case fetchingTrip
case done
case stopped
}
class PlanTripViewModel: ObservableObject {
//Apple frowns upon frezzing a screen so having a way to update the user on what is going on
//When a step is complete have it do something else
@Published var fetchStatus: TripFetchStatus = .stopped{
didSet{
switch fetchStatus {
case .start:
print("Test")
FetchOriginCoordinates { (cors) in
self.origin.lat = cors[0].lat
self.origin.lon = cors[0].lon
self.fetchStatus = .fetchedOriginCoordinates
}
case .fetchedOriginCoordinates:
self.FetchOriginID { (stops) in
self.origin.iD = stops.stopLocationOrCoordLocation[0].StopLocation.mainMastExtId
self.fetchStatus = .fetchedOriginId
}
case .fetchedOriginId:
FetchDestCoordinates { (cors) in
self.dest.lat = cors[0].lat
self.dest.lon = cors[0].lon
self.fetchStatus = .fetchedDestinationCoordinates
}
case .fetchedDestinationCoordinates:
self.FetchDestID { (stops) in
self.dest.iD = stops.stopLocationOrCoordLocation[0].StopLocation.mainMastExtId
self.fetchStatus = .fetchedDestinationId
}
case .fetchedDestinationId:
//Once you have everthing in place then go to the next API
FetchTrip()
case .fetchingTrip:
print("almost done")
case .done:
print("any other code you need to do")
case .stopped:
print("just a filler")
}
}
}
@Published var trip: LocationInfo = LocationInfo()
@Published var dest: LocationInfo = LocationInfo()
@Published var origin: LocationInfo = LocationInfo()
@Published var arrivalTime = String()
@Published var travelDate = String()
@Published var tripIndex = Int()
@Published var Trips: [Dictionary<String, String>] = []
public func FetchTrip() {
Trips.removeAll()
let tripKey = "40892db48b394d3a86b2439f9f3800fd"
let tripUrl = URL(string: "http://api.sl.se/api2/TravelplannerV3_1/trip.json?key=\(tripKey)&originExtId=\(self.origin.iD)&destExtId=\(self.dest.iD)&Date=\(self.travelDate)&Time=\(self.arrivalTime)&searchForArrival=1")
print(tripUrl)
URLSession.shared.dataTask(with: tripUrl!) {data, response, error in
if let data = data {
print(data)
print("Level 1")
do {
print("Level 1.5")
if let decodedJson = try? JSONDecoder().decode(JSONStructure.self, from: data) {
self.tripIndex = decodedJson.Trip.count - 1
print("Level 2")
for i in 0..<decodedJson.Trip[self.tripIndex].LegList.Leg.count {
self.trip.transportType = decodedJson.Trip[self.tripIndex].LegList.Leg[i].type
if self.trip.transportType == "WALK" {
self.origin.name = decodedJson.Trip[self.tripIndex].LegList.Leg[i].Origin.name
self.origin.time = String(decodedJson.Trip[self.tripIndex].LegList.Leg[i].Origin.time.prefix(5))
self.origin.date = decodedJson.Trip[self.tripIndex].LegList.Leg[i].Origin.date
self.dest.name = decodedJson.Trip[self.tripIndex].LegList.Leg[i].Destination.name
self.dest.time = String(decodedJson.Trip[self.tripIndex].LegList.Leg[i].Destination.time.prefix(5))
self.dest.date = decodedJson.Trip[self.tripIndex].LegList.Leg[i].Destination.date
self.trip.vehicleType = decodedJson.Trip[self.tripIndex].LegList.Leg[i].Product.catIn
self.trip.dist = decodedJson.Trip[self.tripIndex].LegList.Leg[i].dist
print(self.origin.name)
print(self.dest.name)
self.Trips.append(["Origin": self.origin.name, "Destination": self.dest.name, "OriginTime": self.origin.time, "DestTime": self.dest.time, "OriginDate": self.origin.date, "DestDate": self.dest.date, "TransportType": self.trip.transportType, "VehicleType": self.trip.vehicleType, "Distance": self.trip.dist])
}
else {
self.origin.name = decodedJson.Trip[self.tripIndex].LegList.Leg[i].Origin.name
self.origin.time = String(decodedJson.Trip[self.tripIndex].LegList.Leg[i].Origin.time.prefix(5))
self.origin.date = decodedJson.Trip[self.tripIndex].LegList.Leg[i].Origin.date
self.dest.name = decodedJson.Trip[self.tripIndex].LegList.Leg[i].Destination.name
self.dest.time = String(decodedJson.Trip[self.tripIndex].LegList.Leg[i].Destination.time.prefix(5))
self.dest.date = decodedJson.Trip[self.tripIndex].LegList.Leg[i].Destination.date
self.trip.vehicleType = decodedJson.Trip[self.tripIndex].LegList.Leg[i].Product.catIn
self.trip.legName = decodedJson.Trip[self.tripIndex].LegList.Leg[i].name
print(self.origin.name)
print(self.dest.name)
self.Trips.append(["Origin": self.origin.name, "Destination": self.dest.name, "OriginTime": self.origin.time, "DestTime": self.dest.time, "OriginDate": self.origin.date, "DestDate": self.dest.date, "TransportType": self.trip.transportType, "VehicleType": self.trip.vehicleType, "LegName": self.trip.legName])
}
}
}
} catch {
print(error)
}
}
}.resume()
print(self.Trips)
}
//Simple version just to replicate put your code within
private func FetchOriginCoordinates(completion: @escaping ([NominationStructure]) -> ()) {
let scheme = "https"
let host = "nominatim.openstreetmap.org"
let path = "/search"
let queryItemCountry = URLQueryItem(name: "country", value: "Sweden")
let queryItemCity = URLQueryItem(name: "city", value: "Stockholm")
let queryItemStreet = URLQueryItem(name: "street", value: self.origin.input)
let queryItemFormat = URLQueryItem(name: "format", value: "json")
var urlComponents = URLComponents()
urlComponents.scheme = scheme
urlComponents.host = host
urlComponents.path = path
urlComponents.queryItems = [queryItemCountry, queryItemCity, queryItemStreet, queryItemFormat]
URLSession.shared.dataTask(with: urlComponents.url!) {data, response, error in
if let data = data {
do {
if let decodedJson = try? JSONDecoder().decode([NominationStructure].self, from: data) {
DispatchQueue.main.async {
completion (decodedJson)
}
}
} catch {
print(error)
}
}
}.resume()
}
private func FetchDestCoordinates(completion: @escaping ([NominationStructure]) -> ()) {
let scheme = "https"
let host = "nominatim.openstreetmap.org"
let path = "/search"
let queryItemCountry = URLQueryItem(name: "country", value: "Sweden")
let queryItemCity = URLQueryItem(name: "city", value: "Stockholm")
let queryItemStreet = URLQueryItem(name: "street", value: self.dest.input)
let queryItemFormat = URLQueryItem(name: "format", value: "json")
var urlComponents = URLComponents()
urlComponents.scheme = scheme
urlComponents.host = host
urlComponents.path = path
urlComponents.queryItems = [queryItemCountry, queryItemCity, queryItemStreet, queryItemFormat]
URLSession.shared.dataTask(with: urlComponents.url!) {data, response, error in
if let data = data {
do {
if let decodedJson = try? JSONDecoder().decode([NominationStructure].self, from: data) {
DispatchQueue.main.async {
completion (decodedJson)
}
}
} catch {
print(error)
}
}
}.resume()
}
private func FetchOriginID(completion: @escaping (NearbyStopsStructure) -> ()) {
let nearbyStopsKey = "8444f9a2f75f4c27937a7165abd532a0"
let stopIDUrl = URL(string: "http://api.sl.se/api2/nearbystopsv2.json?key=\(nearbyStopsKey)&originCoordLat=\(self.origin.lat)&originCoordLong=\(self.origin.lon)&maxNo=1")
URLSession.shared.dataTask(with: stopIDUrl!) {data, response, error in
if let data = data {
do {
if let decodedJson = try? JSONDecoder().decode(NearbyStopsStructure.self, from: data) {
DispatchQueue.main.async {
completion (decodedJson)
}
}
} catch {
print(error)
}
}
}.resume()
}
private func FetchDestID(completion: @escaping (NearbyStopsStructure) -> ()) {
let nearbyStopsKey = "8444f9a2f75f4c27937a7165abd532a0"
let stopIDUrl = URL(string: "http://api.sl.se/api2/nearbystopsv2.json?key=\(nearbyStopsKey)&originCoordLat=\(self.dest.lat)&originCoordLong=\(self.dest.lon)&maxNo=1")
URLSession.shared.dataTask(with: stopIDUrl!) {data, response, error in
if let data = data {
do {
if let decodedJson = try? JSONDecoder().decode(NearbyStopsStructure.self, from: data) {
DispatchQueue.main.async {
completion (decodedJson)
}
}
} catch {
print(error)
}
}
}.resume()
}
}
