无法在 SwiftUI 中两次选择同一行 [英] Can't select same row twice in SwiftUI
问题描述
我有一个包含多个部分和行的导航列表.我选择一行 foo，它导航到我想要的视图.但是，当我返回根视图时，无法选择行 foo.我点击了 foo 行，没有任何反应.
I have a navigation list with multiple sections and rows. I select a row foo, it navigates to the view I want. However, when I go back to the root view, I can't select row foo. I tap row foo and nothing happens.
我点击行栏，该行将我带到它的视图.回到根视图.然后我无法选择行栏，但现在行 foo 有效.
I tap row bar and that row sends me to its view. Back to the root view. Then I can't select row bar, but now row foo works.
这是 SwiftUI 中的错误还是设计行为?当我离开视图时，我需要做些什么来重置视图吗?
Is this a bug in SwiftUI or designed behavior? Is there something I need to do to reset views when I leave them?
NavigationView {
List {
Section(header: shoppingListData.lastItemSection.sectionHeader, footer: shoppingListData.lastItemSection.sectionFooter) {
ForEach(0..<shoppingListData.lastItemSection.sectionRows.count) { index in
ShoppingItemRow(shoppingListData: self.shoppingListData,
rowItem: self.shoppingListData.lastItemSection.sectionRows[index])
}
}
}
}
这是另一个有同样问题的案例.我只能选择表单的选择器行一次.如果我回到根视图，然后再回到这个视图，我可以再次选择选择器.
Here is another case with the same problem. I can only select the picker row of the form once. If I go back to the root view and then back again to this view, I can select the picker again.
如果我将pickerStyle设置为SegmentedPickerStyle()，我可以多次选择它.
If I set the pickerStyle to SegmentedPickerStyle(), I can select it multiple times.
struct ShoppingItemPage: View {
@ObservedObject var shoppingListData: ShoppingListData
@ObservedObject var shoppingItem: ShoppingItems
var body: some View {
Form {
Section(header: Text("Packages")) {
HStack {
Text("Quantity (\(shoppingItem.myUnit.myName))")
TextField("Quantity (\(shoppingItem.myUnit.myName))", value: $shoppingItem.stdQty, formatter: basicFormat)
.textFieldStyle(RoundedBorderTextFieldStyle())
.keyboardType(.numbersAndPunctuation)
Toggle("Need", isOn: $shoppingItem.needed)
}
HStack {
Text("Item Name")
TextField("Item Name", text: $shoppingItem.myName, onEditingChanged: { (a) in
self.shoppingItem.modified()
}) {
self.shoppingItem.modified()
}.textFieldStyle(RoundedBorderTextFieldStyle())
}
Picker(selection: $shoppingItem.urgency, label: Text("Urgency")) {
ForEach(Ledgers.ReceiptUrgency.list(), id: \.rawValue) { urgency in
Text(urgency.description()).tag(urgency)
}
}
}
}.navigationBarTitle(Text(shoppingItem.myName))
}
}
运行 XCode 版本 11.2.1 (11B500) 和iOS 13.3 测试版.
Running XCode Version 11.2.1 (11B500) and iOS 13.3 beta.
添加 ShoppingItemRow 以获取更多信息
Adding ShoppingItemRow for more information
struct ShoppingItemRow: View {
@ObservedObject var shoppingListData: ShoppingListData
@ObservedObject var rowItem: ShoppingItems
var id: UUID {
return rowItem.uuidKey
}
var body: some View {
NavigationLink(destination: ShoppingItemPage(shoppingListData: shoppingListData, shoppingItem: rowItem)) {
HStack(alignment: .center) {
VStack(alignment: .leading) {
rowName
rowDescription
rowPremiumDescription
}
Spacer()
VStack(alignment: .trailing) {
rowPrice
rowPremium
}
}.padding(3)
}.background(premiumColor)
}
var rowName: Text {
if let msp = rowItem.minStorePackage {
return Text(msp.brandName).font(.body).fontWeight(.bold)
}
// fall through
return Text(rowItem.myName).font(.body).fontWeight(.bold)
}
var rowPrice: Text {
if let msp = rowItem.minStorePackage {
let dq = msp.defQty
let pr = msp.pkgCost(pkgQty: dq)
return Text(pr.cash()).font(.body)
} else if let mp = rowItem.minPackage {
let dq = mp.defQty
let pr = mp.pkgCost(pkgQty: dq)
return Text(pr.cash()).font(.body)
} else {
return Text("rowPrice Test")
// return Text("0").hidden() as! Text
}
}
var rowPremium: Text? {
if let msp = rowItem.minStorePackage {
let dq = msp.defQty
let pc = msp.premiumCents(pkgQty: dq)
if pc == 0 {
return Text("0").hidden() as? Text
} else {
return Text(pc.cash()).font(.caption)
}
} else {
return Text("0").hidden() as? Text
}
}
var rowDescription: Text? {
if let msp = rowItem.minStorePackage {
let dq = msp.defQty
let unitText: String
if msp.pkgInteger {
if dq == 1 {
unitText = "\(msp.pkgSize.basicString()) \(rowItem.myUnit.myName)"
} else {
unitText = "\(dq.basicString()) x [\(msp.pkgSize.basicString()) \(rowItem.myUnit.myName)]"
}
} else {
unitText = "\((dq * msp.pkgSize).basicString()) \(rowItem.myUnit.myName)"
}
let thisText = "\(unitText) \(msp.costX()) (\(msp.stdPrice.cash())/\(rowItem.myUnit.myName))"
return Text(thisText).font(.caption)
} else {
return Text("").hidden() as? Text
}
}
var rowPremiumDescription: Text? {
if let msp = rowItem.minStorePackage {
let dq = msp.defQty
let premium = msp.premiumCents(pkgQty: dq)
if premium == 0 {
return Text("Minimum price at \(shoppingListData.dataStack.currentReceipt.myStore!.longName).").font(.caption)
} else {
let mp = rowItem.minPackage!
return Text("\(premium.cash()) cheaper at \(mp.myStore.longName)").font(.caption)
}
} else if let mp = rowItem.minPackage {
let dq = mp.defQty
let pc = "Minimum price \(mp.pkgCost(pkgQty: dq).cash()) (\(mp.stdPrice.cash()) \(rowItem.myUnit.myName)) at "
let storeName = mp.myStore.longName
return Text("\(pc)\(storeName)").font(.caption)
} else {
return Text("").hidden() as? Text
}
}
var premiumColor: Color {
if let msp = rowItem.minStorePackage {
let dq = msp.defQty
let pc = msp.premiumCents(pkgQty: dq)
if pc == 0 {
return Color.yellow
} else {
return Color.clear
}
} else {
return Color.clear
}
}
}
推荐答案
Apple 在 iOS 13.3 beta 4 中修复了该错误.请记住，iOS 13.3 在您测试时处于测试阶段.这不是 iOS 13.2 中的错误，因此无需再担心.
The bug is fixed by Apple in iOS 13.3 beta 4. Keep in mind that iOS 13.3 was in beta at the time you tested it. It was not a bug in iOS 13.2, so this is nothing to worry about anymore.
iOS 13.3 版本更新:
该错误已在物理设备上修复，但仍存在于模拟器上.
The bug is fixed on physical devices but is still present on emulator.
这篇关于无法在 SwiftUI 中两次选择同一行的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
