SwiftUI TextField for decimal input

DecimalTextField.swift

struct DecimalTextField: View {
    
    @Binding var decimalValue: Decimal

    @State var clearValue: Decimal = 1
    var clearValueString: String {
        return String("\(clearValue)")
    }
    
    @State private var lastValidInput: String?
    
    let localizedSeparator = NumberFormatter().decimalSeparator!
    
    var inputValidator: Binding<String> {
        //adapted from: https://stackoverflow.com/a/58031510/150181
        Binding<String>(
            get: { self.lastValidInput ?? String("\(self.decimalValue)") },
            set: {
                                
                let matchesInputFormat = $0.range(of: "^[0-9]{0,9}([\(self.localizedSeparator)][0-9]{0,9})?$", options: .regularExpression) != nil
                //adapted from https://stackoverflow.com/a/54381284/150181
                
                if matchesInputFormat {
                    self.decimalValue = Decimal(string: $0) ?? self.clearValue
                    self.lastValidInput = $0
                } else {
                    self.inputValidator.wrappedValue = self.lastValidInput ?? self.clearValueString
                }
        })
    }
    
    var body: some View {
        HStack {
            TextField("", text: inputValidator)
                .keyboardType(.decimalPad)
            Button(action: {
                self.inputValidator.wrappedValue = self.clearValueString
            }) {
                Image(systemName: "xmark.circle.fill")
                    .accentColor(.secondary)
            }
        }
        
    }
}

This may be stupid—it's my first SwiftUI component, so no guarantees. Still, solves the problem of decimal input with user-friendly validation. All you have to do is pass it a Decimal binding:

DecimalTextField(decimalValue: $reference.decimal)