ios Swift 自定义后退按钮和目的地

Swift Custom Back Button and Destination

提问by Prateek

I am currently using SWRevealViewController for a sidebar menu in my app. When I click one of the options, the destination view controller doesn't have a 'back' button because it hasn't come from a proper view controller (i.e. page to go back to).

我目前在我的应用程序中使用 SWRevealViewController 作为侧边栏菜单。当我单击其中一个选项时，目标视图控制器没有“返回”按钮，因为它不是来自正确的视图控制器（即要返回的页面）。

Therefore I am wanting to manually create a back button on the destination view controller which will go back to the home view controller.

因此，我想在目标视图控制器上手动创建一个后退按钮，该按钮将返回主视图控制器。

I have looked at the code here: How do I manually set the "Back" destination in iOS apps

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

But I am struggling to implement this in Swift (one error after another!). Any help? Thanks!

但我正在努力在 Swift 中实现这一点（一个又一个错误！）。有什么帮助吗？谢谢！

EDIT

编辑

I have tried the suggestion below, but the back button just doesn't appear. This may have something to with the fact I have the navbar hidden in other views and do the following on the destination view:

我已经尝试了下面的建议，但后退按钮没有出现。这可能与我将导航栏隐藏在其他视图中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)
}

Not sure why the back button won't show up?

不知道为什么后退按钮不会出现？

Edit

编辑

This is the prepareForSegue from my sidebar view controller. If there is a way to check for the segue identifier 'test' then I can set the back button from here?

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吗？

- (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];
    };

}

}

回答by codester

You can write that in swift like this

你可以像这样用swift写

Write this to add button on navigationController

写这个来添加按钮 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

this will pops to rootViewController

这将弹出 rootViewController

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

回答by Sourabh Sharma

Swift 3.0Solution:

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)
    }

回答by swiftBoy

In Swift 2.1

在Swift 2.1 中

I am customizing Navigation Bar Itemsthis way

我正在以这种方式自定义导航栏项目

• I can change Navigation bar background image, title text, text color
• I can show/hide back button
• I can Change Title/ Icon or custom action method

• 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

In AppDelegateI have

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
    }

In ViewControllerI update Navigation Items in viewWillAppear method this way

在 ViewController 中，我以这种方式更新 viewWillAppear 方法中的导航项

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)

    }

回答by jlhonora

Here's an updated version for Swift 2/2.1:

这是 Swift 2/2.1 的更新版本：

self.navigationController? .setNavigationBarHidden(false, animated:true)
let backButton = UIButton(type: UIButtonType.Custom)
backButton.addTarget(self, action: "methodCall:", forControlEvents: UIControlEvents.TouchUpInside)
backButton.setTitle("TITLE", forState: UIControlState.Normal)
backButton.sizeToFit()
let backButtonItem = UIBarButtonItem(customView: backButton)
self.navigationItem.leftBarButtonItem = backButtonItem

回答by Roma Kavinskyi

Swfit 5 / XCode 11.4

Swfit 5 / XCode 11.4

override func viewDidLoad() {
    super.viewDidLoad()

    navigationController!.setNavigationBarHidden(false, animated: true)
    let myBackButton:UIButton = UIButton(type: UIButton.ButtonType.custom) as UIButton
    myBackButton.addTarget(self, action: #selector(popToRoot), for: UIControl.Event.touchUpInside)
    myBackButton.setTitle("YOUR TITLE", for: UIControl.State.normal)
    myBackButton.setTitleColor(UIColor.white, for: UIControl.State.normal)
    myBackButton.sizeToFit()
    let myCustomBackButtonItem:UIBarButtonItem = UIBarButtonItem(customView: myBackButton)
     self.navigationItem.leftBarButtonItem  = myCustomBackButtonItem
}

Also, popToRoot you should mark as @objc

另外， popToRoot 你应该标记为@objc

 @objc func popToRoot() {
        //enter action here
    }