Could not load NIB in bundle: 'NSBundle (loaded)' with name 'ButtonCell'

[nesalexy]

Hello, i have added XLPagerTabStrip from swift package #771 (comment) .My code looks like this:

import UIKit
import XLPagerTabStrip


class MainVC: ButtonBarPagerTabStripViewController, Storyboarded {
    
    var coordinator: AuthorizedCoordinator?
    
    let blueInstagramColor = UIColor(red: 37/255.0, green: 111/255.0, blue: 206/255.0, alpha: 1.0)
    
    override func viewDidLoad() {
        // change selected bar color
        settings.style.buttonBarBackgroundColor = UIColor.white
        settings.style.buttonBarItemBackgroundColor = UIColor.white
        settings.style.selectedBarBackgroundColor = blueInstagramColor
        //settings.style.buttonBarItemFont = .boldSystemFont(ofSize: 14)
        settings.style.selectedBarHeight = 2.0
        settings.style.buttonBarMinimumLineSpacing = 0
        settings.style.buttonBarItemTitleColor = UIColor.black
        settings.style.buttonBarItemsShouldFillAvailableWidth = true
        settings.style.buttonBarLeftContentInset = 0
        settings.style.buttonBarRightContentInset = 0

        changeCurrentIndexProgressive = { [weak self] (oldCell: ButtonBarViewCell?, newCell: ButtonBarViewCell?, progressPercentage: CGFloat, changeCurrentIndex: Bool, animated: Bool) -> Void in
            guard changeCurrentIndex == true else { return }
            oldCell?.label.textColor = .black
            newCell?.label.textColor = self?.blueInstagramColor
        }
        super.viewDidLoad()
    }
    
    // MARK: - PagerTabStripDataSource
    override func viewControllers(for pagerTabStripController: PagerTabStripViewController) -> [UIViewController] {
        let child_2 = ChildExampleViewController(itemInfo: "YOU")
        let child_1 = ChildExampleViewController(itemInfo: "ME")
        return [child_1, child_2]
    }
    

ChildExampleViewController from XLPagerTabStrip example:

import UIKit
import XLPagerTabStrip

class ChildExampleViewController: UIViewController, IndicatorInfoProvider {

    var itemInfo: IndicatorInfo = "View"

    init(itemInfo: IndicatorInfo) {
        self.itemInfo = itemInfo
        super.init(nibName: nil, bundle: nil)
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        let label = UILabel()
        label.translatesAutoresizingMaskIntoConstraints = false
        label.text = "XLPagerTabStrip"

        view.addSubview(label)
        view.backgroundColor = .white

        view.addConstraint(NSLayoutConstraint(item: label, attribute: .centerX, relatedBy: .equal, toItem: view, attribute: .centerX, multiplier: 1, constant: 0))
        view.addConstraint(NSLayoutConstraint(item: label, attribute: .centerY, relatedBy: .equal, toItem: view, attribute: .centerY, multiplier: 1, constant: -50))
    }

    // MARK: - IndicatorInfoProvider

    func indicatorInfo(for pagerTabStripController: PagerTabStripViewController) -> IndicatorInfo {
        return itemInfo
    }
}

My VC in storyboard

When i run the project i have en error:
**Thread 1: "Could not load NIB in bundle: 'NSBundle (loaded)' with name 'ButtonCell'"**

Please give to me advice how i can fix this issue

[mikezliu]

Are you using 9.0.0 with Swift 5 support?

[csotiriou]

I am, and it seems that reverting to 8.1.1 fixed my issue. Probably the library supports swift 5 but my project is old and it doesn't support it yet.