[barButtonItem valueForKey:@"view"] returns nil

[jonnyro23]

[barButtonItem valueForKey:@"view"]

sometimes returns nil and hub not showing up

[huangboju]

view -> _view
have a try

[cwRichardKim]

what is the intended use case here? (apologies for late response)

[marcuswu0814]

@cwRichardKim , when using UIBarButtonItem's init method initWithTitle:style:target:action: will cause this issue, if create a UIBarButtonItem with customView, it work well.

[cwRichardKim]

not sure i understand, but can i close this issue?

[Lasithih]

Have the same problem

[jkpang]

iOS Custom Badge, Support UIView, UITabBarItem, UIBarButtonItem ,Support Objective-C/Swift :
https://github.com/jkpang/PPBadgeView
have a try

[hanks-hu]

You can use
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.001 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
self.rightBarButtonHub = [[RKNotificationHub alloc] initWithBarButtonItem: BarButtonItemm];
});

[allaire]

Fixed the issue by switching to customView UIBarButtonItem:

Before:

    var activityViewsBarButtonItem: UIBarButtonItem {
        return UIBarButtonItem(image: UIImage(named: "AlarmIcon"), style: .plain, target: self, action: #selector(BaseTabBarController.activityViewsBarButtonItemPressed(_:)))
    }

After:

    var activityViewsBarButtonItem: UIBarButtonItem {
        let button = UIButton(type: .system)
        button.setImage(UIImage(named: "AlarmIcon"), for: .normal)
        button.frame = CGRect(x: 0, y: 0, width: 35, height: 35)
        button.addTarget(self, action: #selector(BaseTabBarController.activityViewsBarButtonItemPressed(_:)), for: .touchUpInside)
        
        return UIBarButtonItem(customView: button)
    }

And then it worked. I think this was a regression in iOS 11 (unsure). @cwRichardKim hope it helps!