在视图Swift 5中追加一个值

我有一个变量叫UYEADST。我将从数据库中提取的数据添加到此变量。将数据添加到变量并提取数据是没有问题的，用print输出也没有问题。但是当我在viewDidLoad中提取变量UYEADST时，它似乎是一个空值。有什么问题

class profilViewController: UIViewController {

    var bilgiUYEADST : String = ""

    func bilgiUYEAD(){
                let client = SQLClient.sharedInstance()!
                       client.connect("...", username: "...", password: "...", database: "...") { success in
                       client.execute("SELECT form_adsoyad FROM uzaktanptomg_db.omg_user.ie_form WHERE form_no LIKE '\(self.form_no)'", completion: { (_ results: ([Any]?)) in
                                  for table in results as! [[[String:AnyObject]]] {
                                   for row in table {
                                   for (_, value) in row {
                                     if let intVal = value as? String {
                                        self.bilgiUYEADST = intVal
                                       }} }}
                        DispatchQueue.main.asyncAfter(deadline: .now()) { [weak self] in
 } client.disconnect() }) } }

 override func viewDidLoad() {
        super.viewDidLoad()
        if passwordKeychain != nil {
            form_no = passwordKeychain!
        }

        view.backgroundColor = .white

        bilgiUYEAD()
        emailLabel.text = (bilgiUYEADST)
        }

---

在

viewWillApper

中尝试相同的操作。这可能是因为代码正在异步运行。您建议我怎么做@Chirag90一种方法是在

bilgiUYEAD

函数中添加一个完成块，然后尝试在完成块中执行其余代码。您应该将其添加为下面的答案。