Unable to access UIView subclass IBOutlets From TabBarController

Question

I have a UIView Class with xib. I try to add it in another ViewControllers as a popover view. I have outlet connections. But when I run the application it crashed and stated

This class is not key value coding-compliant for the key btnAbtUs

I think the problem is should select delegate. I may using wrong way to add this xib. How can I correct it?

Here is my code.

my UIView subclass

class MoreView: UIView {

    @IBOutlet var containerView: UIView!
    @IBOutlet weak var btnAboutUs: UIButton!

    override public func awakeFromNib() {
        super.awakeFromNib()
    }

    override init(frame: CGRect) {
        super.init(frame: frame)
        loadViewFromNib()
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        loadViewFromNib()
    }

    func loadViewFromNib() {
        let bundle = Bundle(for: type(of: self))
        let nib = UINib(nibName: "MoreView", bundle: bundle)
        let view = nib.instantiate(withOwner: self, options: nil)[0] as! UIView
        view.frame = bounds
        view.autoresizingMask = [.flexibleWidth, .flexibleHeight]
        self.insertSubview(view, at: 0)
        commitInit()
    }

    private func commitInit(){
        containerView.translatesAutoresizingMaskIntoConstraints = true
        self.btnAboutUs.addTarget(self, action: #selector(self.clickAboutUs(_:)), for: .touchUpInside)
    }

    class func instanceFromNib() -> UIView {
        return UINib(nibName: "MoreView", bundle: nil).instantiate(withOwner: nil, options: nil)[0] as! UIView
    }

    @objc func clickAboutUs(_ sender: Any) {
        print("tap")
    }
}

in UITabBarController

func tabBarController(_ tabBarController: UITabBarController, shouldSelect viewController: UIViewController) -> Bool {
    
    let moreView = MoreView.instanceFromNib
    
    if let navigationController = viewController as? UINavigationController,
        navigationController.viewControllers.contains(where: { $0 is MoreViewController }) {
        moreView().frame.origin.y = 100
        self.view.addSubview(moreView())
        
        return false
    } else  {
        moreView().removeFromSuperview()
        return true
    }
}

Answer 1

Finally I found the issue. This is the right way to add a UIView as a SubView controller of a UIViewController.

func tabBarController(_ tabBarController: UITabBarController, shouldSelect viewController: UIViewController) -> Bool {

    if let navigationController = viewController as? UINavigationController,
        navigationController.viewControllers.contains(where: { $0 is MoreViewController }) {
        let mySubView : MoreView
        mySubView = MoreView(frame: CGRect(x: 0, y: 0, width: 375, height: 667) )
        self.view.addSubview(mySubView)
        return false
    } else  {
        return true
    }
}