如何使用 swiftUI 完成电子邮件验证？
TextField("Please enter your e-mail", text: self.$email)
.modifier(ClearButton(text: $email))
.font(.headline)
.padding(10)
.foregroundColor(.black)
.background(Color.white)
.frame(width: 300, height: 40, alignment: .center)
.cornerRadius(20)