WebView完整问题显示加载html-swift

使用Webview，我将显示从数据库中获取的html代码。但是我不能显示完整的html。在页面的一半未显示后，我在所有页面上都遇到此问题。我分配的字符串值有限制吗

final class SSSWebView: UIViewController {

    @IBOutlet weak var webVİew: WKWebView!
    var formHTML = String()

    @IBAction func menuSlider(_ sender: Any) {
          toggleSideMenuView()
      }
      let keychain = KeychainSwift()

    @IBOutlet weak var logButton: UIBarButtonItem!
    @IBAction func logoutButton(_ sender: Any) {

          let mainStoryboard = UIStoryboard(name: "Main", bundle: Bundle.main)
          let vc : MyNavigationController = mainStoryboard.instantiateViewController(withIdentifier: "loginNavControl") as! MyNavigationController
            vc.modalPresentationStyle = .fullScreen
            self.present(vc, animated: false, completion: nil)
      }

    override func viewDidLoad() {
        super.viewDidLoad()
          let loginKeychain = keychain.get("LoginSuccess")     
HTMLKodOku()
    }

    func HTMLKodOku() {
               let client = SQLClient.sharedInstance()!
                                     client.connect("...", username: "...", password: "...", database: "...") { success in
                                     client.execute("SELECT sayfa_icerik FROM ... WHERE ... = 22", 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.formHTML.append(String(intVal))
                                                         }
                                                     }
                                                 }
                                             }
                                       DispatchQueue.main.async {
                                self.webVİew.loadHTMLString(self.formHTML, baseURL: nil)
                                       }
                                             client.disconnect()
                                         })
                                     } } }

---

遵循苹果官方文档： 字符串作为NSString桥接到Objective-C，源于Objective-C的字符串可以将其字符存储在NSString中。由于NSString的任何任意子类都可以成为字符串，因此在这种情况下无法保证表示或效率

NSString对象的最大长度是多少

NSString的最大限制为整数最大字符数。NSUIntegerMax为2^32-1，NSString可以容纳略多于42亿个字符