SwiftUI Passing arguments over to View is not always available - view

Question

I have a problem with passing arguments over to a View in SwiftUI when calling it. I have this View
import SwiftUI
struct GoodsItemFilterView: View {
#Environment(\.presentationMode) var presentationMode
#State var ref1Array: [String] = []
#State var ref2Array: [String] = []
#State var ref3Array: [String] = []
#State var stockStatusArray: [String] = []
#State var zoneArray: [String] = []
#State var selectorRef1 = 0
#State var selectorRef2 = 0
#State var selectorRef3 = 0
#State var selectorStockStatus = 0
#State var selectorZone = 0
var body: some View {
NavigationView {
Form{
Section(header: Text("Zone"), content: {
Picker(selection: $selectorZone, label:
Text("Zone")) {
ForEach(0 ..< zoneArray.count, id:\.self) {
Text(self.zoneArray[$0])
}
}
})
Section(header: Text("References"), content: {
Picker(selection: $selectorRef1, label:
Text("Reference 1")) {
ForEach(0 ..< ref1Array.count, id:\.self) {
Text(self.ref1Array[$0])
}
}
Picker(selection: $selectorRef2, label:
Text("Reference 2")) {
ForEach(0 ..< ref2Array.count, id:\.self) {
Text(self.ref2Array[$0])
}
}
Picker(selection: $selectorRef3, label:
Text("Reference 3")) {
ForEach(0 ..< ref3Array.count, id:\.self) {
Text(self.ref3Array[$0])
}
}
})
Section(header: Text("Status"), content: {
Picker(selection: $selectorStockStatus, label:
Text("Condition")) {
ForEach(0 ..< stockStatusArray.count, id:\.self) {
Text(self.stockStatusArray[$0])
}
}
})
Button(action: {
self.selectorZone = 0
self.selectorRef1 = 0
self.selectorRef2 = 0
self.selectorRef3 = 0
self.selectorStockStatus = 0
}, label: {
HStack(){
Spacer()
Image(systemName: "return")
Text("Reset filters")
Spacer()
}
})
}.navigationBarTitle("Filter")
.navigationBarItems(leading: (
Button(action: {
self.presentationMode.wrappedValue.dismiss()
}, label: {
Text("Cancel")
}
)
), trailing: (
Button(action: {
self.presentationMode.wrappedValue.dismiss()
}, label: {
Text("Done")
}
)
))
}.onAppear{
self.ref1Array.insert("***ALL***", at: 0)
self.ref2Array.insert("***ALL***", at: 0)
self.ref3Array.insert("***ALL***", at: 0)
self.stockStatusArray.insert("***ALL***", at: 0)
self.zoneArray.insert("***ALL***", at: 0)
}
}
}
struct GoodsItemFilter_Previews: PreviewProvider {
static var previews: some View {
GoodsItemFilterView(ref1Array: ["MAX100", "MAX101", "MAX102"], ref2Array: ["REF2_100", "REF2_101"], ref3Array: ["REF3_100", "REF3_101"])
}
}
and when I call it I can pass over the values of the arrays as arguments:
GoodsItemFilterView(ref1Array: ["MAX100", "MAX101", "MAX102"], ref2Array: ["REF2_100", "REF2_101"], ref3Array: ["REF3_100", "REF3_101"])
Now I have another view which is basically a copy of this one with a few changed names etc
//
// OrderHeaderFilter.swift
// WMS Toolbox
//
// Created by Max on 2020-01-24.
// Copyright © 2020 Max. All rights reserved.
//
import SwiftUI
//import Combine
struct OrderHeaderFilterView: View {
#Environment(\.presentationMode) var presentationMode
#State var orderTypeArray: [String] = []
#State var carrierArray: [String] = []
#State var fromStatus2 = UserDefaults.standard.string(forKey: "view.orderHeaderFilter.fromStatus")
// #State private var fromStatus2 = "040"
#State private var direction = ""
#State private var fromStatus = ""
#State private var toStatus = ""
#State private var orderType = ""
#State var selectorOrderType = 0
#State var selectorCarrier = 0
#State private var selectorIndex = 1
#State private var fromStatusSelectorIndex = 6
#State private var toStatusSelectorIndex = 2
#State private var directions = ["Inbound","Outbound","Both"]
private var orderStatusFromArray: [String] = ["005", "010", "022", "025", "030", "035", "040", "045", "046", "047", "060"]
private var orderStatusToArray: [String] = ["005", "010", "022", "025", "030", "035", "040", "045", "046", "047", "060"]
#State var orderStatus = OrderStatus.s05
enum OrderStatus: String, CaseIterable, Identifiable {
case s05 = "005"
case s10 = "010"
case s22 = "022"
case s25 = "025"
case s30 = "030"
case s35 = "035"
case s40 = "040"
case s45 = "045"
case s46 = "046"
case s60 = "060"
var id: String { rawValue }
}
enum Direction: String, CaseIterable{
case outbound = "1"
case inbound = "2"
case both = "3"
init(type: String) {
switch type {
case "1": self = .outbound
case "2": self = .inbound
case "3": self = .both
default: self = .both
}
}
var text: String {
switch self {
case .outbound: return "Outbound"
case .inbound: return "Inbound"
case .both: return "Both"
}
}
}
init(){
//nothing here
}
var body: some View {
return NavigationView{
Form{
HStack{
Text("Direction")
Spacer()
Picker(selection: $direction, label:
Text("Direction")) {
ForEach(directions, id:\.self) {
status in
Text(status)
}
}
.pickerStyle(SegmentedPickerStyle())
}
Picker(selection: $fromStatus, label:
Text("From Status")) {
ForEach(orderStatusFromArray, id:\.self) {
status in
Text(status)
}
}
Picker(selection: $toStatus, label:
Text("To Status")) {
ForEach(orderStatusFromArray, id:\.self) {
status in
Text(status)
}
}
}.navigationBarTitle("Filter")
.navigationBarItems(leading: (
Button(action: {
self.presentationMode.wrappedValue.dismiss()
}, label: {
Text("Cancel")
}
)
), trailing: (
Button(action: {
self.presentationMode.wrappedValue.dismiss()
}, label: {
Text("Done")
}
)
))
}.onAppear{
self.direction = UserDefaults.standard.string(forKey: "view.orderHeaderFilter.direction")!
self.fromStatus = UserDefaults.standard.string(forKey: "view.orderHeaderFilter.fromStatus")!
self.toStatus = UserDefaults.standard.string(forKey: "view.orderHeaderFilter.toStatus")!
self.orderTypeArray.insert("***ALL***", at: 0)
self.carrierArray.insert("***ALL***", at: 0)
}
}
}
struct OrderHeaderFilter_Previews: PreviewProvider {
static var previews: some View {
OrderHeaderFilterView()
}
}
and when I call it, it is not prompting me to pass over the arrays as arguments:
OrderHeaderFilterView()
What is the difference between those 2 views that the one is asking for arguments on initilization and the other one isn't? To be clear, in the end I want to pass over the arguments, so GoodsItemFilterView() is doing exactly what I need.

Answer 1

EnvironmentObjects are not passed via init method they are implicitly injected. The orderTypeArray and carrierArray have already initial values. So OrderHeaderFilterView() does not prompt you for arguments.

Answer 2

Found the issue(s):
I had this piece in the code
init(){
//nothing here
}
This needs to be removed, otherwise it will not ask for any variables.
The other issue is the one I don't understand:
private var orderStatusFromArray: [String] = ["005", "010", "022", "025", "030", "035", "040", "045", "046", "047", "060"]
private var orderStatusToArray: [String] = ["005", "010", "022", "025", "030", "035", "040", "045", "046", "047", "060"]
If I change the var to let, it works as expected. Another option is to remove the private at the beginning. So it looks like as soon as you have a
private var ...
in your code, all arguments become private. Maybe I am missing something here but that seems like a bug to me.