UIBarButtonItem-Badge for iOS

问题

I am using this control for showing badge on barbuttonitem. It works fine for the first controller or root controller in navigation controller stack. While pushing to another controller, I tried to show badge and I cannot see any effect there.

回答1:

You should first time set badgeValue in viewDidLayoutSubviews. In this case it'll appear and don't blink, like if you set it in viewDidAppear:

    - (void)viewDidLayoutSubviews {
        barButton.badgeValue = @"5";
    }

回答2:

Setting navigationItem in viewDidLayoutSubviews is not recommended because it is not semantic.

The key to your problem is that the badge view is added to [UIBarButtonItem valueForKey:@"view"], but when UIBarButtonItem is initialized, valueForKey:@"view" doesn't exist yet, so adding a badge fails.

I suggest you try QMUIBadge, it can solve your problem.

UIBarButtonItem *rightItem = [[UIBarButtonItem alloc] init];
rightItem.qmui_badgeInteger = 1;// number
rightItem.qmui_badgeString = @"99+";// or string

// setRightBarButtonItem any time
self.navigationItem.rightBarButtonItem = rightItem;

来源：https://stackoverflow.com/questions/34611639/uibarbuttonitem-badge-for-ios