如何防止键盘出现ios时导航栏隐藏?

Question

我有一个应用程序，它在情节提要上有一个 Web 视图，它在 ASP 中加载一个注册表单，所以当键盘或选取器出现时，导航栏会隐藏，但永远不会回来，所以我无法回到最后一页。

这是我的代码：

import UIKit
class BannerViewController: UIViewController {
@IBOutlet var webView11: UIWebView!
override var preferredStatusBarStyle: UIStatusBarStyle  {
return .default
}
override var prefersStatusBarHidden: Bool  {
return false
}
override func viewWillAppear(_ animated: Bool) {
self.navigationItem.setHidesBackButton(false, animated: true)
self.setNeedsStatusBarAppearanceUpdate()

self.navigationController?.navigationBar.barTintColor = UIColor(red: 0, green: 0.38, blue: 0.667, alpha: 1)
self.navigationController?.navigationBar.tintColor = UIColor(red: 1, green: 1, blue: 1, alpha: 1)
var titleTextAttributes = [String : AnyObject]();
titleTextAttributes[NSFontAttributeName] = UIFont.systemFont(ofSize: 17, weight: UIFontWeightSemibold)
titleTextAttributes[NSForegroundColorAttributeName] = UIColor(red: 1, green: 1, blue: 1, alpha: 1)
self.navigationController?.navigationBar.titleTextAttributes = titleTextAttributes
}
override func viewDidLoad() {
super.viewDidLoad();
self.navigationController?.navigationBar.barStyle = .default
self.setNeedsStatusBarAppearanceUpdate()
self.navigationController?.setNavigationBarHidden(false, animated: true)
self.webView11.delegate = self;
if let unwrappedwebView11 = URL(string: "http://www.stackoverflow") {
self.webView11.loadRequest(URLRequest(url: unwrappedwebView11))
}
}

}

extension BannerViewController: UIWebViewDelegate {

}

Answer 1

所以，看起来我需要刷新视图或其他东西，因为我在 webView 中添加了一个后退按钮，当我单击并返回上一个视图时，然后我再次进入 webView 导航栏不再移动