如何隐藏TextField的底边？

TextField("Placeholder", text: $text)
    .textFieldStyle(.plain)

struct CustomTextField: UIViewRepresentable {
    @Binding var text: String
    
    func makeUIView(context: Context) -> UITextField {
        let textField = UITextField()
        textField.borderStyle = .none
        textField.backgroundColor = .clear
        return textField
    }
    
    func updateUIView(_ uiView: UITextField, context: Context) {
        uiView.text = text
    }
}

// 在视图中使用自定义的TextField
CustomTextField(text: $text)