问题
I am trying to generate a Formatted Full address using CLGeocoder in Swift 3. I referred to this SO thread to get the code given below.
However, sometimes the app crashes with a 'nil' error at the line:
//Address dictionary
print(placeMark.addressDictionary ?? "")
Questions:
- How can I concatenate these values retrieved from the GeoCoder to form a full address? (Street + City + etc)
- How do I handle the nil error I get when the func is unable to find an address?
Full code:
func getAddress() -> String {
var address: String = ""
let geoCoder = CLGeocoder()
let location = CLLocation(latitude: selectedLat, longitude: selectedLon)
//selectedLat and selectedLon are double values set by the app in a previous process
geoCoder.reverseGeocodeLocation(location, completionHandler: { (placemarks, error) -> Void in
// Place details
var placeMark: CLPlacemark!
placeMark = placemarks?[0]
// Address dictionary
//print(placeMark.addressDictionary ?? "")
// Location name
if let locationName = placeMark.addressDictionary!["Name"] as? NSString {
//print(locationName)
}
// Street address
if let street = placeMark.addressDictionary!["Thoroughfare"] as? NSString {
//print(street)
}
// City
if let city = placeMark.addressDictionary!["City"] as? NSString {
//print(city)
}
// Zip code
if let zip = placeMark.addressDictionary!["ZIP"] as? NSString {
//print(zip)
}
// Country
if let country = placeMark.addressDictionary!["Country"] as? NSString {
//print(country)
}
})
return address;
}
回答1:
func getAddressFromLatLon(pdblLatitude: String, withLongitude pdblLongitude: String) {
var center : CLLocationCoordinate2D = CLLocationCoordinate2D()
let lat: Double = Double("\(pdblLatitude)")!
//21.228124
let lon: Double = Double("\(pdblLongitude)")!
//72.833770
let ceo: CLGeocoder = CLGeocoder()
center.latitude = lat
center.longitude = lon
let loc: CLLocation = CLLocation(latitude:center.latitude, longitude: center.longitude)
ceo.reverseGeocodeLocation(loc, completionHandler:
{(placemarks, error) in
if (error != nil)
{
print("reverse geodcode fail: \(error!.localizedDescription)")
}
let pm = placemarks! as [CLPlacemark]
if pm.count > 0 {
let pm = placemarks![0]
print(pm.country)
print(pm.locality)
print(pm.subLocality)
print(pm.thoroughfare)
print(pm.postalCode)
print(pm.subThoroughfare)
var addressString : String = ""
if pm.subLocality != nil {
addressString = addressString + pm.subLocality! + ", "
}
if pm.thoroughfare != nil {
addressString = addressString + pm.thoroughfare! + ", "
}
if pm.locality != nil {
addressString = addressString + pm.locality! + ", "
}
if pm.country != nil {
addressString = addressString + pm.country! + ", "
}
if pm.postalCode != nil {
addressString = addressString + pm.postalCode! + " "
}
print(addressString)
}
})
}
回答2:
Formatting addresses is hard because each country has its own format.
With a few lines of code, you can get the correct address format for each country and let Apple handle the differences.
Since iOS 11, you can get a Contacts framework address:
extension CLPlacemark {
@available(iOS 11.0, *)
open var postalAddress: CNPostalAddress? { get }
}
This extension is part of the Contacts framework.
This means, this feature is invisible to you in the XCode code completion until you do
import Contacts
With this additional import, you can do something like
CLGeocoder().reverseGeocodeLocation(location, preferredLocale: nil) { (clPlacemark: [CLPlacemark]?, error: Error?) in
guard let place = clPlacemark?.first else {
print("No placemark from Apple: \(String(describing: error))")
return
}
let postalAddressFormatter = CNPostalAddressFormatter()
postalAddressFormatter.style = .mailingAddress
var addressString: String?
if let postalAddress = place.postalAddress {
addressString = postalAddressFormatter.string(from: postalAddress)
}
}
and get the address formatted in the format for the country in the address.
The formatter even supports formatting as an attributedString.
Prior to iOS 11, you can convert CLPlacemark to CNPostalAddress yourself and still can use the country specific formatting of CNPostalAddressFormatter.
回答3:
This is my code for swift 3
func getAdressName(coords: CLLocation) {
CLGeocoder().reverseGeocodeLocation(coords) { (placemark, error) in
if error != nil {
print("Hay un error")
} else {
let place = placemark! as [CLPlacemark]
if place.count > 0 {
let place = placemark![0]
var adressString : String = ""
if place.thoroughfare != nil {
adressString = adressString + place.thoroughfare! + ", "
}
if place.subThoroughfare != nil {
adressString = adressString + place.subThoroughfare! + "\n"
}
if place.locality != nil {
adressString = adressString + place.locality! + " - "
}
if place.postalCode != nil {
adressString = adressString + place.postalCode! + "\n"
}
if place.subAdministrativeArea != nil {
adressString = adressString + place.subAdministrativeArea! + " - "
}
if place.country != nil {
adressString = adressString + place.country!
}
self.lblPlace.text = adressString
}
}
}
}
You can esaily call above funcation like:
let cityCoords = CLLocation(latitude: newLat, longitude: newLon)
cityData(coord: cityCoords)
回答4:
To concatenate you can simply replace return address by this :
return "\(locationName), \(street), \(city), \(zip), \(country)"
回答5:
Keeping it simple - A full Swift 3 & 4 compatible View Controller example for obtaining a formatted address string from user's location (add in the other keys available in CLPlacemark if you want more information in your string):
import UIKit
import CoreLocation
class ViewController: UIViewController, CLLocationManagerDelegate {
let manager = CLLocationManager()
let geocoder = CLGeocoder()
var locality = ""
var administrativeArea = ""
var country = ""
override func viewDidLoad() {
super.viewDidLoad()
manager.delegate = self
manager.desiredAccuracy = kCLLocationAccuracyBest
manager.requestWhenInUseAuthorization()
manager.startUpdatingLocation()
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
let location = locations[0]
manager.stopUpdatingLocation()
geocoder.reverseGeocodeLocation(location, completionHandler: {(placemarks, error) in
if (error != nil) {
print("Error in reverseGeocode")
}
let placemark = placemarks! as [CLPlacemark]
if placemark.count > 0 {
let placemark = placemarks![0]
self.locality = placemark.locality!
self.administrativeArea = placemark.administrativeArea!
self.country = placemark.country!
}
})
}
func userLocationString() -> String {
let userLocationString = "\(locality), \(administrativeArea), \(country)"
return userLocationString
}
}
Calling print(userLocationString()) in this example will print: suburb, state, country
Don't forget to add Privacy - Location When In Use Usage Description to your Info.plist file beforehand, to allow the user to grant permissions to your app to utilise location services.
回答6:
- For fixing the empty address issue, either you can use a class property to hold the appended value or you can use a closure to return the value back to the calling function
- For fixing the crash you need to avoid the force unwrapping of optionals
Using a closure you can do it like:
// Using closure
func getAddress(handler: (String) -> Void)
{
var address: String = ""
let geoCoder = CLGeocoder()
let location = CLLocation(latitude: selectedLat, longitude: selectedLon)
//selectedLat and selectedLon are double values set by the app in a previous process
geoCoder.reverseGeocodeLocation(location, completionHandler: { (placemarks, error) -> Void in
// Place details
var placeMark: CLPlacemark?
placeMark = placemarks?[0]
// Address dictionary
//print(placeMark.addressDictionary ?? "")
// Location name
if let locationName = placeMark?.addressDictionary?["Name"] as? String {
address += locationName + ", "
}
// Street address
if let street = placeMark?.addressDictionary?["Thoroughfare"] as? String {
address += street + ", "
}
// City
if let city = placeMark?.addressDictionary?["City"] as? String {
address += city + ", "
}
// Zip code
if let zip = placeMark?.addressDictionary?["ZIP"] as? String {
address += zip + ", "
}
// Country
if let country = placeMark?.addressDictionary?["Country"] as? String {
address += country
}
// Passing address back
handler(address)
})
}
You can call the method like:
getAddress { (address) in
print(address)
}
回答7:
CLGeocoder().reverseGeocodeLocation(CLLocation(latitude: vehicleLocation.latitude, longitude: vehicleLocation.latitude), completionHandler: {(placemarks, error) -> Void in
guard error == nil else {completionHandler(nil); return}
guard let place = placemarks else {completionHandler(nil); return}
if place.count > 0 {
let pm = place[0]
var addArray:[String] = []
if let name = pm.name {
addArray.append(name)
}
if let thoroughfare = pm.thoroughfare {
addArray.append(thoroughfare)
}
if let subLocality = pm.subLocality {
addArray.append(subLocality)
}
if let locality = pm.locality {
addArray.append(locality)
}
if let subAdministrativeArea = pm.subAdministrativeArea {
addArray.append(subAdministrativeArea)
}
if let administrativeArea = pm.administrativeArea {
addArray.append(administrativeArea)
}
if let country = pm.country {
addArray.append(country)
}
if let postalCode = pm.postalCode {
addArray.append(postalCode)
}
let addressString = addArray.joined(separator: ",\n")
print(addressString)
completionHandler(addressString)
}
else { completionHandler(nil)}
})
回答8:
I create my own static class for Geocoding and get attributes of CLPlacemark and obtain a complete address, like "usually" returns Google:
import Foundation
import CoreLocation
class ReverseGeocoding {
static func geocode(latitude: Double, longitude: Double, completion: @escaping (CLPlacemark?, _ completeAddress: String?, Error?) -> ()) {
CLGeocoder().reverseGeocodeLocation(CLLocation(latitude: latitude, longitude: longitude)) { placemarks, error in
guard let placemark = placemarks?.first, error == nil else {
completion(nil, nil, error)
return
}
let completeAddress = getCompleteAddress(placemarks)
completion(placemark, completeAddress, nil)
}
}
static private func getCompleteAddress(_ placemarks: [CLPlacemark]?) -> String {
guard let placemarks = placemarks else {
return ""
}
let place = placemarks as [CLPlacemark]
if place.count > 0 {
let place = placemarks[0]
var addressString : String = ""
if place.thoroughfare != nil {
addressString = addressString + place.thoroughfare! + ", "
}
if place.subThoroughfare != nil {
addressString = addressString + place.subThoroughfare! + ", "
}
if place.locality != nil {
addressString = addressString + place.locality! + ", "
}
if place.postalCode != nil {
addressString = addressString + place.postalCode! + ", "
}
if place.subAdministrativeArea != nil {
addressString = addressString + place.subAdministrativeArea! + ", "
}
if place.country != nil {
addressString = addressString + place.country!
}
return addressString
}
return ""
}
}
Then the implementation:
ReverseGeocoding.geocode(coordinate: coordinate, completion: { (placeMark, completeAddress, error) in
if let placeMark = placeMark, let completeAddress = completeAddress {
print(placeMark.postalCode)
print(placeMark)
print(completeAddress)
} else {
// do something with the error
}
Finaly the print:
15172
Calle del Arenal, 4, Calle del Arenal, 4, 15172 Oleiros, A Coruña, España @ <+43.33190337,-8.37144380> +/- 100.00m, region CLCircularRegion (identifier:'<+43.33190337,-8.37144380> radius 70.84', center:<+43.33190337,-8.37144380>, radius:70.84m)
Calle del Arenal, 4, Oleiros, 15172, A Coruña, España
来源：https://stackoverflow.com/questions/41358423/swift-generate-an-address-format-from-reverse-geocoding