SwiftUI：随机“调用中的额外参数”错误
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【中文标题】SwiftUI：随机“调用中的额外参数”错误【英文标题】：SwiftUI: Random "Extra argument in call" error 【发布时间】：2020-07-25 11:30:35 【问题描述】：所以我正在尝试学习 SwiftUI 和 Combine。我通常通过制作一个简单的小费计算器来开始新技术。
我似乎得到了一个随机的“调用中的额外参数”。编码时出错 这是我的 SwiftUI 文件
import SwiftUI
internal enum ReceiptRowType
case subtotal
case tax
case total
case tip
case grandTotal
struct TipView: View
@ObservedObject internal var adBannerView: BannerAdView = BannerAdView()
@ObservedObject internal var receiptViewModel: ReceiptViewModel
private let percentageFormatter: NumberFormatter =
let f = NumberFormatter()
f.numberStyle = .percent
return f
()
var body: some View
ZStack
Color.white
.scaledToFit()
VStack
if adBannerView.adHasLoaded
adBannerView
.frame(maxHeight: adBannerView.adHeight)
.animation(.easeInOut(duration: 2.0))
BorderView()
Text(ARCHLocalizedStrings.receipt)
.foregroundColor(Color.gray)
BorderView()
HStack
Spacer()
Button(action:
self.receiptViewModel.addNewReceiptItem()
)
Text(ARCHLocalizedStrings.buttonTitleAddItem)
BorderView()
ScrollView
ForEach(receiptViewModel.receiptItems) receiptItem in
ItemView(receiptItem: receiptItem)
if receiptItem != self.receiptViewModel.receiptItems.last
Divider()
BorderView()
BottomOfReceiptRow(receiptViewModel: receiptViewModel,
type: ReceiptRowType.subtotal,
title: ARCHLocalizedStrings.subtotal)
BottomOfReceiptRow(receiptViewModel: receiptViewModel,
type: ReceiptRowType.tax,
title: ARCHLocalizedStrings.tax)
.padding(.horizontal, ARCHSwiftUILayoutConstants.defaultPaddingAndSpacing)
struct BorderView: View
var body: some View
Text("================================")
.lineLimit(1)
.foregroundColor(Color.gray)
.minimumScaleFactor(0.5)
struct ItemView: View
@ObservedObject var receiptItem: ReceiptItemViewModel
var body: some View
HStack
TextField(receiptItem.name, text: $receiptItem.name)
.textFieldStyle(RoundedBorderTextFieldStyle())
.foregroundColor(Color.gray)
.multilineTextAlignment(TextAlignment.leading)
TextField("Price", value: $receiptItem.price, formatter: ARCHUtilities.currencyFormatter)
.textFieldStyle(RoundedBorderTextFieldStyle())
.foregroundColor(Color.gray)
.multilineTextAlignment(TextAlignment.trailing)
.minimumScaleFactor(0.5)
.frame(width: ARCHSwiftUILayoutConstants.widthForCurrency)
struct BottomOfReceiptRow: View
@ObservedObject internal var receiptViewModel: ReceiptViewModel
internal var type: ReceiptRowType
internal var title: String
var body: some View
HStack
Spacer()
Text(title)
.foregroundColor(Color.gray)
if type == ReceiptRowType.subtotal
Text("\(receiptViewModel.subtotal)")
.foregroundColor(Color.gray)
.frame(width: ARCHSwiftUILayoutConstants.widthForCurrency)
else if type == ReceiptRowType.tax
Text("\(receiptViewModel.taxRate)")
.foregroundColor(Color.gray)
.frame(width: ARCHSwiftUILayoutConstants.widthForCurrency)
else if type == ReceiptRowType.total
Text("\(receiptViewModel.total)")
.foregroundColor(Color.gray)
.frame(width: ARCHSwiftUILayoutConstants.widthForCurrency)
else if type == ReceiptRowType.tip
else if type == ReceiptRowType.grandTotal
Text("\(receiptViewModel.grandTotal)")
.foregroundColor(Color.gray)
.frame(width: ARCHSwiftUILayoutConstants.widthForCurrency)
struct TipView_Previews: PreviewProvider
static var previews: some View
TipView(receiptViewModel: ReceiptViewModel())
但是，如果我在 TipView 主体（任何视图）上添加另一个视图，我似乎会收到“调用中的额外参数”错误。
Picture of error here
有人知道发生了什么吗？
【问题讨论】：
尝试围绕您的观点创建一个群组 。 Swiftui 中只允许使用 10 个……使用组可以添加更多。或使用子视图...（也将是更简洁的代码） 这个可行，我不知道有限制。但不是一个小组（小组工作完美），我可能应该把一些事情撕成他们自己的观点。 Thnx 请把它写成答案，我会把它作为官方答案。 Chris 和 SparkleBeard 都是正确的解决方案。 【参考方案1】：尝试围绕您的观点创建一个群组 。 Swiftui 中只允许使用 10 个……使用组可以添加更多。或使用子视图...（也将是更简洁的代码）
【讨论】：
Swiftui 中只允许使用 10 个。这真的很有帮助。谢谢！ 您说得对。感谢您兑现我为解决此错误所花费的一整天时间。 感谢 Apple 的另一个随机限制......现在我的代码有 11 个视图，为了“使代码简单易读”有 22 个额外的包装行！ - 感谢您解决这个问题。当我注意到这个错误出现在第 11 个视图时，我立即怀疑另一个随机限制......【参考方案2】：SwiftUI 中的@ViewBuilder 系统在任何给定的视图容器中都被限制为 10 个视图。第 11 个视图没有任何论据，因此您会收到该错误。
基本解决方案：
这里的问题是您的 VStack 已达到最大容量，但是您可以将这些现有视图包装在其他容器中。作为一个非常基本的示例，它允许您显示 10 个BottomReceiptRow 视图：
var body: some View
ZStack
Color.white
.scaledToFit()
// Modifications start here
VStack
if adBannerView.adHasLoaded
adBannerView
.frame(maxHeight: adBannerView.adHeight)
.animation(.easeInOut(duration: 2.0))
BorderView()
Text(ARCHLocalizedStrings.receipt)
.foregroundColor(Color.gray)
BorderView()
HStack
Spacer()
Button(action:
self.receiptViewModel.addNewReceiptItem()
)
Text(ARCHLocalizedStrings.buttonTitleAddItem)
BorderView()
ScrollView
ForEach(receiptViewModel.receiptItems) receiptItem in
ItemView(receiptItem: receiptItem)
if receiptItem != self.receiptViewModel.receiptItems.last
Divider()
BorderView()
Group
BottomOfReceiptRow(receiptViewModel: receiptViewModel,
type: ReceiptRowType.subtotal,
title: ARCHLocalizedStrings.subtotal)
BottomOfReceiptRow(receiptViewModel: receiptViewModel,
type: ReceiptRowType.tax,
title: ARCHLocalizedStrings.tax)
BottomOfReceiptRow(receiptViewModel: receiptViewModel,
type: ReceiptRowType.someValue,
title: ARCHLocalizedStrings.someValue)
BottomOfReceiptRow(receiptViewModel: receiptViewModel,
type: ReceiptRowType.someValue2,
title: ARCHLocalizedStrings.someValue2)
BottomOfReceiptRow(receiptViewModel: receiptViewModel,
type: ReceiptRowType.someValue3,
title: ARCHLocalizedStrings.someValue3)
BottomOfReceiptRow(receiptViewModel: receiptViewModel,
type: ReceiptRowType.someValue4,
title: ARCHLocalizedStrings.someValue4)
BottomOfReceiptRow(receiptViewModel: receiptViewModel,
type: ReceiptRowType.someValue5,
title: ARCHLocalizedStrings.someValue5)
// Modifications end here
.padding(.horizontal, ARCHSwiftUILayoutConstants.defaultPaddingAndSpacing)
或者：
您可能更愿意将这些部分完全重构为它们自己的View，因为组合使代码更易于阅读。不过，这里并不是绝对必要的。
如果您确实想这样做，您可以考虑一个示例，其中这些收据行都在它们自己的视图中，例如：
var body: some View
ZStack
Color.white
.scaledToFit()
VStack
if adBannerView.adHasLoaded
adBannerView
.frame(maxHeight: adBannerView.adHeight)
.animation(.easeInOut(duration: 2.0))
BorderView()
Text(ARCHLocalizedStrings.receipt)
.foregroundColor(Color.gray)
BorderView()
HStack
Spacer()
Button(action:
self.receiptViewModel.addNewReceiptItem()
)
Text(ARCHLocalizedStrings.buttonTitleAddItem)
BorderView()
ScrollView
ForEach(receiptViewModel.receiptItems) receiptItem in
ItemView(receiptItem: receiptItem)
if receiptItem != self.receiptViewModel.receiptItems.last
Divider()
BorderView()
bottomRow
.padding(.horizontal, ARCHSwiftUILayoutConstants.defaultPaddingAndSpacing)
// Additional computed property in TipView
var bottomRow: some View
Group
BottomOfReceiptRow(receiptViewModel: receiptViewModel,
type: ReceiptRowType.subtotal,
title: ARCHLocalizedStrings.subtotal)
BottomOfReceiptRow(receiptViewModel: receiptViewModel,
type: ReceiptRowType.tax,
title: ARCHLocalizedStrings.tax)
BottomOfReceiptRow(receiptViewModel: receiptViewModel,
type: ReceiptRowType.someValue,
title: ARCHLocalizedStrings.someValue)
BottomOfReceiptRow(receiptViewModel: receiptViewModel,
type: ReceiptRowType.someValue2,
title: ARCHLocalizedStrings.someValue2)
BottomOfReceiptRow(receiptViewModel: receiptViewModel,
type: ReceiptRowType.someValue3,
title: ARCHLocalizedStrings.someValue3)
BottomOfReceiptRow(receiptViewModel: receiptViewModel,
type: ReceiptRowType.someValue4,
title: ARCHLocalizedStrings.someValue4)
BottomOfReceiptRow(receiptViewModel: receiptViewModel,
type: ReceiptRowType.someValue5,
title: ARCHLocalizedStrings.someValue5)
// end bottomRow
【讨论】：
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