我在调用时将参数传递给SwiftUI中的View时遇到问题。我有这个视图
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"])
}
}
并且当我调用它时，我可以将数组的值作为参数传递：
GoodsItemFilterView(ref1Array: ["MAX100", "MAX101", "MAX102"], ref2Array: ["REF2_100", "REF2_101"], ref3Array: ["REF3_100", "REF3_101"])
现在我有另一种视图，基本上是该视图的副本，并具有一些更改的名称，等等
//
// 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()
}
}
并且当我调用它时，它并没有提示我将数组作为参数传递：
OrderHeaderFilterView()
[这两个视图要求初始化有关的论点，而另一个不要求初始化的观点之间有什么区别？为了清楚起见，最后我想传递参数，所以GoodsItemFilterView（）正是在做我需要的事情。
EnvironmentObjects不通过init方法传递，而是被隐式注入。 orderTypeArray和carrierArray已经具有初始值。因此，OrderHeaderFilterView（）不会提示您输入参数。
发现问题：
我在代码中有这部分
init(){
//nothing here
}
需要删除，否则它将不要求任何变量。
另一个问题是我不了解的问题：
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"]
如果我将var更改为let，它将按预期工作。另一种选择是在一开始就删除私有文件。这样看来，只要您有
private var ...
在您的代码中，所有参数都变为私有。也许我在这里错过了一些东西，但对我来说似乎是个bug。