InputTextView with indicator border

InputTextView.swift

import SwiftUI

@available(iOS 15.0, *)
struct InputTextView: View {
    private let placeholder: String?
    private let text: Binding<String>
    private let isError: Binding<Bool>
    @FocusState private var isFocused: Bool
    
    init(
        placeholder: String? = nil,
        text: Binding<String>,
        isError: Binding<Bool>
    ) {
        self.placeholder = placeholder
        self.text = text
        self.isError = isError
    }
    
    private var borderColor: Color {
        if isFocused {
            return Color.gray
        } else if isError.wrappedValue {
            return Color.red
        } else {
            return Color.blue
        }
    }
    
    var body: some View {
        TextField("", text: text)
            .font(.body)
            .padding(.vertical, 12)
            .padding(.leading, 8)
            .focused($isFocused)
            .overlay(RoundedRectangle(cornerRadius: 4).stroke(borderColor, lineWidth:1))
            .padding(.bottom, 16)
    }
}