我想在 SwiftUI 中向 TextField 添加 $ 符号 [英] I want to add $ sign to TextField in SwiftUI

问题描述

我想在用户键入时向 TextField 添加 $ 符号.

Hi I want to add $ sign to a TextField when a user is typing.

这是我当前的代码.

ZStack(alignment: .leading) {
  if price.isEmpty {
    Text("Enter total budget")
  }
  HStack {
    TextField("", text: $price)
      .keyboardType(.decimalPad)
  }
}

推荐答案

currency formatter 是可行的方法，但如果您只想在键入时在 TextField 中显示 $，您可以使用以下方法:(您当然可以将此方法与格式化程序结合使用)

currency formatter is the way to go, but if you just want to show a $ in the TextField as you type, you could use something like this: (you can of course combine this approach with a Formatter)

struct ContentView: View {
    @State var price = ""
    
    var body: some View {
        VStack {
            ZStack(alignment: .leading) {
                if price.isEmpty {
                    Text("Enter total budget")
                }
                HStack {
                    TextField("", text: Binding(
                        get: { price },
                        set: { newVal in
                        if price.starts(with: "$") {
                            price = newVal
                        } else {
                            price = "$" + newVal
                        }
                    })).keyboardType(.decimalPad)
                }
            }.padding(20)
            Text("number entered: " + String(price.dropFirst()))
        }
    }
}

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