TextField接受有限字符SwiftUi

import SwiftUI

struct ContentView: View {
    @State private var text: String = ""
    
    var body: some View {
        VStack {
            TextField("请输入数字", text: $text)
                .keyboardType(.numberPad)
                .textContentType(.oneTimeCode) // 设置为数字类型
                .onReceive(Just(text)) { newValue in
                    let filtered = newValue.filter { "0123456789".contains($0) } // 只允许输入数字
                    if filtered != newValue {
                        self.text = filtered
                    }
                }
        }
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}