Question

我试图通过按下按钮从当前控制器中推送新的视图控制器。但是，一旦出现了新的控制器，顶部的导航栏就会消失，我尝试了很多方法，但似乎无法找回。

我正在以编程方式完成所有代码，而无需使用Interface Builder。

我尝试了以下代码的列表，但没有一个起作用。

  override func viewDidLoad() {
    super.viewDidLoad()
self.navigationController?.setNavigationBarHidden(false, animated: false)
    self.navigationItem.leftBarButtonItem = UIBarButtonItem(image: #imageLiteral(resourceName: "backimg"), style: .plain, target: self, action: #selector(backTapped))

    let webV:UIWebView = UIWebView(frame: CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: UIScreen.main.bounds.height))
    webV.loadRequest(NSURLRequest(url: NSURL(string: "https://*****************.com")! as URL) as URLRequest)
    webV.delegate = self;
    self.view.addSubview(webV)
    self.navigationController?.navigationBar.isHidden = false
    navigationController?.isNavigationBarHidden = false
}

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(true)
    self.navigationController?.navigationBar.isHidden = false
    self.navigationController?.setNavigationBarHidden(false, animated: false)
}
override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(true)
    self.navigationController?.navigationBar.isHidden = false
    self.navigationController?.setNavigationBarHidden(false, animated: false)
}

@objc func backTapped(_ sender: Any){
    self.dismiss(animated: true, completion: nil)

}

我试图按如下所示从按钮的目标功能中推动视图控制器：

  @objc func parkingTimerTapped(_ sender: Any) {
    let pp = ParkingModeScheduleView()

    self.present(pp, animated: true, completion: nil)
    print("Parking Timer Tapped")
 }

我也已经尝试使用以下命令推送视图控制器：

  self.navigationController?.pushViewController(pp, animated: true)

我做错了什么还是错过了什么？

Answer 1

您需要像这样在UINavigation控制器中添加您的parkingModeScheduleview

var xhttp = new XMLHttpRequest();
xhttp.open("POST", url , true);
xhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xhttp.setRequestHeader("X-CSRF-TOKEN", document.head.querySelector("[name=csrf-token]").content );
xhttp.send(params);

Answer 2

使用resourceFolder将新的视图控制器显示为模态，因此它根本不属于导航堆栈，这就是为什么没有导航栏的原因。

我建议尝试使用public class SomeClass { ... public static String resourcesFolder; @Value("${RESOURCES_FOLDER}") public void setResourcesFolder(String resourcesFolder) { this.resourcesFolder = resourcesFolder; } ... }，但由于某种原因，请首先检查@RequestMapping("/user") public Principal loginAuthentication(Principal user) { LOGGER.debug("Request received from frontend to authenticate the user"); try { LOGGER.debug("In try block to authenticate the user"); LOGGER.debug("Returning the user object to the front end"); return user; } catch(Exception e) { LOGGER.error("An exception occured while trying to authenticate the user: " +e); LOGGER.error("Returning NULL to front end"); return null; } }是否不是self.present(pp, animated: true, completion: nil)。同时从您的self.navigationController?.pushViewController(pp, animated: true)

中删除所有导航栏隐藏的相关方法

在Swift中，导航栏消失了，再也不会回来

2 个答案: