Swift自定义后退按钮和目标

Question

我目前正在使用SWRevealViewController作为我的应用程序中的侧边栏菜单.当我单击其中一个选项时,目标视图控制器没有"后退"按钮,因为它没有来自正确的视图控制器(即要返回的页面).

因此,我想在目标视图控制器上手动创建一个后退按钮,它将返回到主视图控制器.

我在这里查看了代码:如何在iOS应用程序中手动设置"返回"目标

但我正在努力在Swift中实现这个(一个接一个错误!).有帮助吗？谢谢!

编辑

我已经尝试了下面的建议,但后面的按钮没有出现.这可能与我在其他视图中隐藏导航栏并在目标视图上执行以下操作有关:

override func viewDidLoad() {
    super.viewDidLoad()
    navigationController.setNavigationBarHidden(false, animated:true)
    var myBackButton:UIButton = UIButton.buttonWithType(UIButtonType.Custom) as UIButton
    myBackButton.addTarget(self, action: "popToRoot:", forControlEvents: UIControlEvents.TouchUpInside)

    var myCustomBackButtonItem:UIBarButtonItem = UIBarButtonItem(customView: myBackButton)
    self.navigationItem.leftBarButtonItem = myCustomBackButtonItem
}

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

func popToRoot(sender:UIBarButtonItem){
    self.navigationController.popToRootViewControllerAnimated(true)
}

不知道为什么后退按钮不会出现？

编辑

这是我的侧边栏视图控制器中的prepareForSegue.如果有办法检查segue标识符'test',那么我可以从这里设置后退按钮？

- (void) prepareForSegue: (UIStoryboardSegue *) segue sender: (id) sender
{
// Set the title of navigation bar by using the menu items
NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
UINavigationController *destViewController = (UINavigationController*)segue.destinationViewController;
destViewController.title = [[_menuItems objectAtIndex:indexPath.row] capitalizedString];


if ( [segue isKindOfClass: [SWRevealViewControllerSegue class]] ) {
    SWRevealViewControllerSegue *swSegue = (SWRevealViewControllerSegue*) segue;

    swSegue.performBlock = ^(SWRevealViewControllerSegue* rvc_segue, UIViewController* svc, UIViewController* dvc) {

        UINavigationController* navController = (UINavigationController*)self.revealViewController.frontViewController;
        [navController setViewControllers: @[dvc] animated: NO ];
        [self.revealViewController setFrontViewPosition: FrontViewPositionLeft animated: YES];
    };

}

}

Answer 1

你可以像这样快速写出来

写下这个以添加按钮 navigationController

    navigationController.setNavigationBarHidden(false, animated:true)
    var myBackButton:UIButton = UIButton.buttonWithType(UIButtonType.Custom) as UIButton
    myBackButton.addTarget(self, action: "popToRoot:", forControlEvents: UIControlEvents.TouchUpInside)
    myBackButton.setTitle("YOUR TITLE", forState: UIControlState.Normal)
    myBackButton.setTitleColor(UIColor.blueColor(), forState: UIControlState.Normal)
    myBackButton.sizeToFit()
    var myCustomBackButtonItem:UIBarButtonItem = UIBarButtonItem(customView: myBackButton)
     self.navigationItem.leftBarButtonItem  = myCustomBackButtonItem

这将弹出 rootViewController

    func popToRoot(sender:UIBarButtonItem){
       self.navigationController.popToRootViewControllerAnimated(true)
    }

Answer 2

Swift 3.0解决方案:

    self.navigationController?.setNavigationBarHidden(false, animated:false)

        //Create back button of type custom

        let myBackButton:UIButton = UIButton.init(type: .custom)
        myBackButton.addTarget(self, action: #selector(ViewController.popToRoot(sender:)), for: .touchUpInside)
        myBackButton.setTitle("Back".localized(), for: .normal)
        myBackButton.setTitleColor(.blue, for: .normal)
        myBackButton.sizeToFit()

       //Add back button to navigationBar as left Button

        let myCustomBackButtonItem:UIBarButtonItem = UIBarButtonItem(customView: myBackButton)
        self.navigationItem.leftBarButtonItem  = myCustomBackButtonItem



 func popToRoot(sender:UIBarButtonItem){
        _ = self.navigationController?.popToRootViewController(animated: true)
    }

Answer 3

在Swift 2.1中

我自定义导航栏项目这样

• 我可以更改导航栏背景图像,标题文本,文本颜色
• 我可以显示/隐藏后退按钮
• 我可以更改标题/图标或自定义操作方法

在AppDelegate我有

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool
    {
        //Cutomize navigation bar
        let navBgImage:UIImage = UIImage(named: "dummy_navigation_bg_image")!
        UINavigationBar.appearance().setBackgroundImage(navBgImage, forBarMetrics: .Default)
        UINavigationBar.appearance().tintColor = UIColor.whiteColor()
        UINavigationBar.appearance().titleTextAttributes = [NSForegroundColorAttributeName : UIColor.whiteColor()];


        return true
    }

在ViewController中,我以这种方式在viewWillAppear方法中更新导航项

override func viewWillAppear(animated: Bool)
    {
        super.viewWillAppear(animated)
        setupNavigationBar()
    }

    // MARK: - NavigationBar methods
    func setupNavigationBar ()
    {

        //current tab screen title
        tabBarController?.title = "Manage"

        //Hide back button or left bar button
        tabBarController?.navigationItem.leftBarButtonItem = UIBarButtonItem(title: " ", style: .Plain, target: nil, action: nil)

        //custom right bar button
        var image = UIImage(named: "dummy_settings_icon")
        image = image?.imageWithRenderingMode(UIImageRenderingMode.AlwaysOriginal)
        tabBarController?.navigationItem.rightBarButtonItem = UIBarButtonItem(image: image, style: UIBarButtonItemStyle.Plain, target: self, action:  "settingButtonAction")
    }

    func settingButtonAction()
    {
        print("Setting Button tapped")
        performSegueWithIdentifier("loadAccountSettingsSegue", sender: nil)

    }