Question

对于我的应用程序，我为iPad制作了一个自定义菜单，以替换我用于iPhone的UITabBarController。它工作得很好，除了当我单击一个选项卡时它会将我带到该选项卡并记住状态。我希望它转而将我带到选项卡的主导航控制器（UITabBarController的直接子项，其中有四个），忘记我最后的位置，就像在本机选项卡栏上按两次时会发生什么项目。有什么想法吗？

在AppDelegate.swift中我有

if UIDevice.currentDevice().userInterfaceIdiom == UIUserInterfaceIdiom.Pad{
 this_is_an_ipad = true
}

在MainTabBarController.swift中我有

class MainTabBarController: UITabBarController {
 override func viewWillLayoutSubviews(){
    if this_is_an_ipad{
        self.tabBar.hidden = true
    }
}

然后我的SideMenuViewController.swift是

import UIKit
class SideMenuViewController: UIViewController {

  @IBOutlet weak var homeButtonView: UIView!
  @IBOutlet weak var searchButtonView: UIView!
  @IBOutlet weak var savedButtonView: UIView!
  @IBOutlet weak var categoriesButtonView: UIView!

  var buttonColor = UIColor(red: 107.0/255.0, green: 14.0/255.0, blue: 74.0/255.0, alpha: 0.8)

  override func viewDidLoad() {
    super.viewDidLoad()
    homeButtonView.backgroundColor = buttonColor
  }

  override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
  }

  @IBAction func homePressed(sender: AnyObject) {
    let tabBarController: UITabBarController? = self.parentViewController?.childViewControllers[1] as? UITabBarController
    tabBarController?.selectedIndex = 0
    unsetBackgroundColors()
    homeButtonView.backgroundColor = buttonColor
  }
  @IBAction func searchPressed(sender: AnyObject) {
    let tabBarController: UITabBarController? = self.parentViewController?.childViewControllers[1] as? UITabBarController
    tabBarController?.selectedIndex = 1
    unsetBackgroundColors()
    searchButtonView.backgroundColor = buttonColor
  }

  @IBAction func savedPressed(sender: AnyObject) {
    let tabBarController: UITabBarController? = self.parentViewController?.childViewControllers[1] as? UITabBarController
    tabBarController?.selectedIndex = 2
    unsetBackgroundColors()
    savedButtonView.backgroundColor = buttonColor
  }

  @IBAction func categoriesPressed(sender: AnyObject) {
    let tabBarController: UITabBarController? = self.parentViewController?.childViewControllers[1] as? UITabBarController
    tabBarController?.selectedIndex = 3
    unsetBackgroundColors()
    categoriesButtonView.backgroundColor = buttonColor
  }

  func unsetBackgroundColors(){
    homeButtonView.backgroundColor = UIColor.clearColor()
    searchButtonView.backgroundColor = UIColor.clearColor()
    savedButtonView.backgroundColor = UIColor.clearColor()
    categoriesButtonView.backgroundColor = UIColor.clearColor()

  }
}

Answer 1

想出来：

await Observable.FromEventPattern<WriteConfirmationEventArgs>(
    h => this.WriteCompleted += h,
    h => this.WriteCompleted -= h)
    .Select(x => x.EventArgs.Id)
    .FirstAsync(x => Guid.Equals(x, dto.Id))
    .Timeout(TimeSpan.FromSeconds(10));

因此SideMenuViewController.swift的相关部分变为：

let nav = tabBarController?.childViewControllers[desiredIndex] as! UINavigationController
nav.popToRootViewControllerAnimated(true)

模仿双按UITabBarController到根视图控制器

1 个答案: