set navigation backBarButtonItem to go to specific UIViewController in Swift

Question

I need the navigation's back button always pops a specific UIViewController.

override func viewDidLoad() {
    super.viewDidLoad()

    //set title image
    var logoImage:UIImage = UIImage(named: "barra")!
    var logoImageView : UIImageView = UIImageView(image: logoImage)
    logoImageView.frame = CGRectMake(0, 0, 320, 44)
    logoImageView.contentMode = .ScaleAspectFit
    logoImageView.contentMode = UIViewContentMode.Center
    logoImageView.clipsToBounds = true
    self.navigationItem.titleView = logoImageView

    //set back image
    var backImage:UIImage = UIImage(named: "freccia")!
    backImage = backImage.imageWithRenderingMode(UIImageRenderingMode.AlwaysOriginal)
    self.navigationItem.backBarButtonItem = UIBarButtonItem(title:"", style: .Plain,target: self, action: "goToServizi:")
    self.navigationController!.navigationBar.backIndicatorImage = backImage
    self.navigationController!.navigationBar.backIndicatorTransitionMaskImage = backImage

    //set menu image
    var menuImage:UIImage = UIImage(named: "menu")!
    menuImage = menuImage.imageWithRenderingMode(UIImageRenderingMode.AlwaysOriginal)
    self.navigationItem.rightBarButtonItem?.image = menuImage

}

func goToServizi(sender: UIBarButtonItem)
{
    self.navigationController?.popToViewController(ServiziVC(), animated: true)// here I add a breakpoint, but it is never executed.
}

ServiziVC is the UIViewController that I need to show every time I click on the Back button.

I can't understand why goToServizi func is not called. Please help.

Thank you.

Dharmesh Kheni · Accepted Answer · 2015-02-27T11:25:17.027

Here is the example for you.

import UIKit

class SecondViewController: UIViewController {

override func viewDidLoad() {
    super.viewDidLoad()

    //Customise your barButton Like this
    var backImage:UIImage = UIImage(named: "freccia")!
    backImage = backImage.imageWithRenderingMode(UIImageRenderingMode.AlwaysOriginal)
    var backButton = UIBarButtonItem(image: backImage, style: UIBarButtonItemStyle.Bordered, target: self, action: "goToThird")
    self.navigationItem.leftBarButtonItem = backButton
}

func goToThird(){

    //Initiate newViewController this way
    let ThirdView = self.storyboard?.instantiateViewControllerWithIdentifier("ThirdViewController") as ThirdViewController

    self.navigationController?.pushViewController(ThirdView, animated: true)
    }
}

EDIT

Click on the ViewController which you want to initiate with identifier and you can find StoryBoard ID in Identity Inspector like shown in below Image.

enter image description here

HERE is the example for you for more reference.

Modify code as per your need.may be this will help you.

where do I have to add identifier for the viewcontroller? In this way how can I add image for the back button? — Chongzl, Feb 27 '15 at 11:05
I tried out your code, it worked. But I have another question, I have about 20 viewcontrollers with custom back button, so I have to change the codes to yours. How can I push the right view? — Chongzl, Feb 27 '15 at 11:28

score 0 · Answer 2 · edited May 23 '17 at 11:51

self.navigationController?.popToViewController(ServiziVC(), animated: true)You can't customize the back button action like that. This works:

override func viewDidLoad() {
    super.viewDidLoad()
    self.navigationItem.hidesBackButton = true;
    var backImage:UIImage = UIImage(named: "freccia")!
    backImage = backImage.imageWithRenderingMode(UIImageRenderingMode.AlwaysOriginal)
    var fakeBackButton = UIBarButtonItem(image: backImage, style: UIBarButtonItemStyle.Bordered, target: self, action: "goToServizi:")
    self.navigationItem.leftBarButtonItem = fakeBackButton;
}

func goToServizi(sender: UIBarButtonItem)
{
    self.navigationController?.popToViewController(ServiziVC(), animated: true)
}

Alternatively, you could override the UINavigationController's delegate method as described here : UINavigationController and back button action

set navigation backBarButtonItem to go to specific UIViewController in Swift

2 Answers2