Form.swift

import Foundation

class Form {
  var formItems = [FormItem]()
  
  var title: String?
  
  var username: String?
  var mail: String?
  var phoneNumber: String?
  
  init() {
    self.configureItems()
    self.title = "Amazing form"
  }
  
  // MARK: Form Validation
  @discardableResult
  func isValid() -> (Bool, String?) {
    
    var isValid = true
    for item in self.formItems {
      item.checkValidity()
      if !item.isValid {
        isValid = false
      }
    }
    return (isValid, nil)
  }
  
  /// Prepare all form Items ViewModels for the DirectStudioForm
  private func configureItems() {
    
    // Username
    let usernameItem = FormItem(placeholder: "Enter your username")
    usernameItem.uiProperties.cellType = FormItemCellType.textField
    usernameItem.value = self.username
    usernameItem.valueCompletion = { [weak self, weak usernameItem] value in
      self?.username = value
      usernameItem?.value = value
    }
    
    // Mail
    let mailItem = FormItem(placeholder: "Enter you mail address")
    mailItem.uiProperties.cellType = FormItemCellType.textField
    mailItem.uiProperties.keyboardType = .emailAddress
    mailItem.value = self.mail
    mailItem.valueCompletion = { [weak self, weak mailItem] value in
      self?.mail = value
      mailItem?.value = value
    }
    
    // Phone Number
    let phoneItem = FormItem(placeholder: "Enter your phone number")
    phoneItem.uiProperties.cellType = FormItemCellType.textField
    phoneItem.uiProperties.keyboardType = .phonePad
    phoneItem.value = self.phoneNumber
    phoneItem.valueCompletion = { [weak self, weak phoneItem] value in
      self?.phoneNumber = value
      phoneItem?.value = value
    }
    
    self.formItems = [usernameItem, mailItem, phoneItem]
  }
}