英文:
SwiftUI - How to display the total of the previous and current item with ForEach loop?
问题
我在下面的代码中添加了以下结果：
name: A amount: 100.50 Total: 100.50
name: B amount: 50.52 Total: 151.02
name: C amount: 85.65 Total: 236.67
英文:
I am getting following result with the code added below:
name: A amount: 100.50 Total: 236.67
name: B amount: 50.52 Total: 236.67
name: C amount: 85.65 Total: 236.67
Instead, I would like to display the following results at each ForEach loop
name: A amount: 100.50 Total: 100.50
name: B amount: 50.52 Total: 151.02
name: C amount: 85.65 Total: 236.67
Below is the coding details:-
import SwiftUl
struct NameAmount: Identifiable {
let id = UUID()
let name: String
let amount: Double
}
struct ContentView: View {
let transactions: [NameAmount] = [
NameAmount(name: "A", amount: 100.50),
NameAmount (name: "B", amount: 50.52),
NameAmount (name: "C", amount: 85.65)
]
var body: some View {
VStack {``
List {
VStack {
ForEach(transactions) { item in
HStack {
Text(item.name)
Text("(String (format: "%.2f", item.amount))")
Spacer()
Text("Total: (String(format: '%.2f", transactions.reduce(0)($0 + $1.amount))")
}
}
}
}
}
}
}
Text("Total: (String(format: '%.2f", transactions.reduce(0)($0 + $1.amount))")
// the .reduce code is displaying the total of 236.67 at each foreach loop.
Instead, I would like to display the following results at each ForEach loop
name: A amount: 100.50 Total: 100.50
name: B amount: 50.52 Total: 151.02
name: C amount: 85.65 Total: 236.67
答案1
得分: -1
以下是您要翻译的内容：
如果你有当前的 `index` 并使用 `transactions` 的子集 `[0...index]`，你可以做到。
struct PartialSunView: View {
struct NameAmount: Identifiable {
let id = UUID()
let name: String
let amount: Double
}
let transactions: [NameAmount] = [
NameAmount(name: "A", amount: 100.50),
NameAmount(name: "C", amount: 50.52),
NameAmount(name: "B", amount: 85.65)
]
var filtered: [NameAmount]{
transactions.sorted(using: KeyPathComparator(\.name))
}
var body: some View {
VStack {
List {
VStack {
ForEach(Array(filtered.enumerated()), id:\.offset) { (index, item) in //获取当前索引
HStack {
Text(item.name)
Text(String (format: "%.2f", item.amount))
Spacer()
Text("Total: \(String(format: "%.2f", filtered[0...index].reduce(0){$0 + $1.amount}))")//使用子集
}
}
}
}
}
}
}
请注意，我已将代码中的 HTML 实体编码 " 替换为正常的引号。
英文:
You can do it if you have the current index and use a subset of transactions [0...index]
struct PartialSunView: View {
struct NameAmount: Identifiable {
let id = UUID()
let name: String
let amount: Double
}
let transactions: [NameAmount] = [
NameAmount(name: "A", amount: 100.50),
NameAmount (name: "C", amount: 50.52),
NameAmount (name: "B", amount: 85.65)
]
var filtered: [NameAmount]{
transactions.sorted(using: KeyPathComparator(\.name))
}
var body: some View {
VStack {
List {
VStack {
ForEach(Array(filtered.enumerated()), id:\.offset) { (index, item) in //Get current index
HStack {
Text(item.name)
Text(String (format: "%.2f", item.amount))
Spacer()
Text("Total: \(String(format: "%.2f", filtered[0...index].reduce(0){$0 + $1.amount}))")//Use subset
}
}
}
}
}
}
}
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