I have a method in my class that opens a map when given an address string. Trying to show an alert in a view by toggling a boolean in a method in the class. I can't figure out how to toggle the boolean in the class method. This is what I tried. The Published bool in class method updates but does not update in the View. I did put up a repo of just this feature if anybody wants to play around with it.
https://github.com/Ongomobile/LocationTest/tree/main/LocationTest
import SwiftUI
@main
struct LocationTestApp: App {
var body: some Scene {
WindowGroup {
ContentView(location: LocationManager())
}
}
}
Here is my Class:
import UIKit
import MapKit
import CoreLocation
import Combine
class LocationManager: NSObject, ObservableObject {
var locationManager = CLLocationManager()
lazy var geocoder = CLGeocoder()
@Published var locationString = "1140"
// @Published var locationString = "1 apple park way cupertino"
@Published var currentAddress = ""
@Published var isValid: Bool = true
func openMapWithAddress () {
geocoder.geocodeAddressString(locationString) { placemarks, error in
if let error = error {
self.isValid = false
// prints false but does not update
print("isValid")
print(error.localizedDescription)
}
guard let placemark = placemarks?.first else {
return
}
guard let lat = placemark.location?.coordinate.latitude else{return}
guard let lon = placemark.location?.coordinate.longitude else{return}
let coords = CLLocationCoordinate2DMake(lat, lon)
let place = MKPlacemark(coordinate: coords)
let mapItem = MKMapItem(placemark: place)
mapItem.name = self.locationString
mapItem.openInMaps(launchOptions: nil)
}
}
}
Here is the view:
import SwiftUI
struct ContentView: View {
@ObservedObject var locationManager = LocationManager()
@State private var showingAlert = false
var body: some View {
Button {
locationManager.openMapWithAddress()
} label: {
Text("Get Map")
}
.alert(isPresented: $showingAlert) {
Alert(title: Text("Important message"), message:
Text("Enter a valid address"), dismissButton:
.default(Text("OK")))
}
}
}
I updated this answer to reflect some refactor help that I got from @rlong405 I put up a repository with this solution maybe it could help others. OpenMapsInSwiftUI
import SwiftUI
struct ContentView: View {
@ObservedObject var locationManager = LocationManager()
var body: some View {
VStack{
Form{
Section {
Text("Enter Address")
TextField("", text: $locationManager.locationString)
.textFieldStyle(RoundedBorderTextFieldStyle())
.padding(.horizontal)
}
Button {
locationManager.openMapWithAddress()
} label: {
Text("Get Map")
}
.alert(isPresented: $locationManager.invalid) {
Alert(title: Text("Important message"), message:
Text("Enter a valid address"), dismissButton:
.default(Text("OK"), action:{
locationManager.invalid = false
locationManager.locationString = ""
}))
}
}
}
}
}
import UIKit
import MapKit
import CoreLocation
import Combine
class LocationManager: NSObject, ObservableObject {
lazy var geocoder = CLGeocoder()
@Published var locationString = ""
@Published var invalid: Bool = false
func openMapWithAddress () {
geocoder.geocodeAddressString(locationString) { placemarks, error in
if let error = error {
DispatchQueue.main.async {
self.invalid = true
}
print(error.localizedDescription)
}
guard let placemark = placemarks?.first else {
return
}
guard let lat = placemark.location?.coordinate.latitude else{return}
guard let lon = placemark.location?.coordinate.longitude else{return}
let coords = CLLocationCoordinate2DMake(lat, lon)
let place = MKPlacemark(coordinate: coords)
let mapItem = MKMapItem(placemark: place)
mapItem.name = self.locationString
mapItem.openInMaps(launchOptions: nil)
}
}
}