[Solved] Default Back Button Text and Font Setting

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Change your code in viewDidLoad like this.

class BaseViewController: UIViewController {

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

    func setNavigationWithCustomBackButton() {
        let btnLeft:UIButton! = UIButton(frame: CGRectMake(0, 0, 20, 16))
        btnLeft.setTitle("<=|", forState: .Normal)
        btnLeft.titleLabel?.font = UIFont.systemFontOfSize(19, weight: UIFontWeightLight)
        btnLeft!.addTarget(self, action: "handleBack:",forControlEvents: UIControlEvents.TouchUpInside)
        let leftItem:UIBarButtonItem = UIBarButtonItem(customView: btnLeft!)
        self.navigationItem.leftBarButtonItem = leftItem
    }

    func handleBack(sender: UIButton) {
        self.navigationController?.popViewControllerAnimated(true)
    }
}

Now use this BaseViewController as parent of your all viewController and call its method in viewDidLoad like this.

class ViewController1: BaseViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        self.setNavigationWithCustomBackButton()
    }
}

Now it will add custom back button in your NavigationBar.
Hope this will help you.

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solved Default Back Button Text and Font Setting