在 SwiftUI 中动态更改货币格式

发布于 2025-01-15 00:38:55 字数 1049 浏览 2 评论 0原文

我正在尝试制作一个非常简单的应用程序，当用户选择其首选货币时，它会更改文本字段的格式

struct ContentView: View {

    @State var currency = "EUR"
    @State var amount = 0.0

    let currencies = ["GBP", "USD", "EUR", "WON", "LKR"]

    var body: some View {
        Form {
            TextField(
                "Amount",
                value: $amount,
                format: .currency(code: currency)
            )

            Picker("Currency", selection: $currency) {
                ForEach(currencies, id: \.self) {
                    Text($0)
                }
            }
            .pickerStyle(.segmented)

            Section {
                Text("Selected: \(currency)")
            }
        }
        .navigationTitle("Currency Picker Issue")
    }
}

此尝试有两个主要问题：

选择新货币实际上并没有改变格式金额字段的
输入金额中的新值不会保存该值（一旦字段失去焦点，它就会返回零

为什么会发生这种情况？

有没有办法在 SwiftUI 中实现类似的东西？

原文

I'm trying to make a dead simple app that changes the format of a text field when the user selects their preferred currency

struct ContentView: View {

    @State var currency = "EUR"
    @State var amount = 0.0

    let currencies = ["GBP", "USD", "EUR", "WON", "LKR"]

    var body: some View {
        Form {
            TextField(
                "Amount",
                value: $amount,
                format: .currency(code: currency)
            )

            Picker("Currency", selection: $currency) {
                ForEach(currencies, id: \.self) {
                    Text($0)
                }
            }
            .pickerStyle(.segmented)

            Section {
                Text("Selected: \(currency)")
            }
        }
        .navigationTitle("Currency Picker Issue")
    }
}

With this attempt there are two main issues:

Selecting a new currency doesn't actually change the format of the amount field
Entering a new value into the amount does not save the value (it shoots back to zero as soon as the field loses focus

Why is this happening?

Is there any way to implement something like this in SwiftUI?

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巷雨优美回忆 2025-01-22 00:38:58

对于您的 1. 问题，您可以通过在 TextField 上使用 .id 来强制 SwiftUI 重绘：

        TextField(
            "Amount",
            value: $amount,
            format: .currency(code: currency)
        )
            .id(currency) // forces redraw of view when changed

您的 2. 问题我无法重现，至少只要您输入有效的金额。

For you 1. issue, you can force SwiftUI to redraw by using .id on the TextField:

        TextField(
            "Amount",
            value: $amount,
            format: .currency(code: currency)
        )
            .id(currency) // forces redraw of view when changed

your 2. issue I cannot reproduce, at least as long as you enter a valid amount.

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