В более старой версии swift 3 я поставил свою переменную после операторов импорта. С новым Swiftui это все еще хороший способ.
1) Swift 3
import UIKit
import AVFoundation
class pushgroups_vc: BaseViewController, UITableViewDelegate, UITableViewDataSource, UITextFieldDelegate, UITextViewDelegate
{
var dbarray_id: [String] = []
var dbarray_code: [String] = []
var dbarray_title: [String] = []
var dbarray_description: [String] = []
var dbarray_public: [String] = []
var dbarray_accesscode: [String] = []
2) Это все еще действует в Swift 5 xcode 11
import SwiftUI
import Combine
let newVars = commonfunc()
var devicetoken:String = ""
var email:String = ""
var password:String = ""
var dbarray_id: [String] = []
var dbarray_subject: [String] = []
var dbarray_body: [String] = []
var dbarray_image: [String] = []
var dbarray_location: [String] = []
var dbarray_start_date: [String] = []