I am building an EV Station app on IOS, which provides users with a map and pins representing EV Charging Stations. I have a NavigationLink with destination: another view that applies filters to the map results. And label: A custom built button. The problem is that when I switch apps and returns again to my app the NavigationLink is not working anymore, not until I switch apps again and return to my app a second time, only then the NavigationLink works again.
This behavior is repeated when I repeat the steps described above.
Below you can see my MainView which contains the above mentioned NavigationLink. you can also find and clone the whole project on github.
import SwiftUI
import MapKit
import CoreLocationUI
import Foundation
import AlertToast
struct MainView: View {
@StateObject var locationController = LocationController()
@StateObject var networkController = NetworkController()
@State public var showingSheet = false
@State public var dismissSheet = false
@State private var showToast = false
@State public var applyFilters = false
@State public var type1 = false
@State public var type2 = false
@State public var csstype1 = false
@State public var csstype2 = false
@State public var chademo = false
@State public var schuko = false
@State public var tesla = false
@State public var dc = false
@State public var ac1 = false
@State public var ac2 = false
@State public var ac2s = false
@State public var ac3 = false
@State public var format: Int = 3
@State public var status: Int = 7
var map: MapView {
MapView(
locationController: locationController,
networkController: networkController,
showingSheet: $showingSheet,
dismissSheet: $dismissSheet,
didSelect: {_ in}
)
}
var body: some View {
NavigationView {
ZStack(alignment: .bottom) {
map.edgesIgnoringSafeArea(.bottom)
LocationButton(.currentLocation) {
print("tapped")
locationController.requestAllowOnceLocationPermission()
}
.foregroundColor(.white)
.cornerRadius(8)
.labelStyle(.iconOnly)
.tint(Color("LightBlue"))
.padding(.bottom, 100 )
.padding(.leading, 330 )
NavigationLink(
destination: FiltersView(
applyFilters: $applyFilters,
type1: $type1,
type2: $type2,
csstype1: $csstype1,
csstype2: $csstype2,
chademo: $chademo,
schuko: $schuko,
tesla: $tesla,
dc: $dc,
ac1: $ac1,
ac2: $ac2,
ac2s: $ac2s,
ac3: $ac3,
format: $format,
status: $status),
label: {
ZStack {
RoundedRectangle(cornerRadius: 8, style: .circular)
.fill(Color("LightBlue"))
HStack {
SwiftUI.Image("Filters")
.resizable()
.scaledToFit()
.padding(10)
Text("Φίλτρα")
.foregroundColor(.white)
.font(.system(size: 15, weight: .regular))
.padding(.trailing, 5)
}
}.frame(minWidth: 100, maxWidth: 110, minHeight: 40, maxHeight: 40)
})
.padding(.bottom, 660 )
.padding(.leading, 250 )
}
//.preferredColorScheme(.dark)
.background(Color("DeepBlue"))
.navigationBarTitleDisplayMode(.inline)
.toolbar {
ToolbarItem(placement: .navigationBarLeading) {
SwiftUI.Image("Logo")
.resizable()
.scaledToFit()
.frame(width: 100, height: 100)
}
}
.sheet(item: $networkController.activeLocation, onDismiss: onSheetDismiss) { item in
BottomSheetView(data: item)
.onDisappear() {
print("dissapear")
}
}
.onAppear {
print("Active View: Main")
if applyFilters {
networkController.applyFilters = .constant(true)
NetworkVariables.FilterOptions.type1 = type1
NetworkVariables.FilterOptions.type2 = type2
NetworkVariables.FilterOptions.csstype1 = csstype1
NetworkVariables.FilterOptions.csstype2 = csstype2
NetworkVariables.FilterOptions.chademo = chademo
NetworkVariables.FilterOptions.schuko = schuko
NetworkVariables.FilterOptions.tesla = tesla
NetworkVariables.FilterOptions.dc = dc
NetworkVariables.FilterOptions.ac1 = ac1
NetworkVariables.FilterOptions.ac2 = ac2
NetworkVariables.FilterOptions.ac2s = ac2s
NetworkVariables.FilterOptions.ac3 = ac3
NetworkVariables.FilterOptions.format = format
NetworkVariables.FilterOptions.status = status
Task {
await networkController.getToken()
showToast.toggle()
}
applyFilters = false
}
}
}
.toast(isPresenting: $showToast){
AlertToast(type: .regular, title: "Βρέθηκαν \(networkController.mapLocations.count) σημεία")
}
}
func onSheetDismiss() {
print("sheet dismissed")
map.dismissSheet = true
}
}
I found what the problem was. As I had read before, this kind of problem usually happens because the app is running on an emulator. So while I was having this problem on physical devices, I realised that the physical devices I was testing were running the app on Testflight which is kind of a sandbox as far as I've understood it. So, the problem was caused because the app was running on testflight, when I installed the app directly to an iOS device through USB, it worked just fine.
Thanks for your replies.