How to add small red dot in UITabBarItem

Question

How to add red dot on the top right side of the UITabBarItem.

I h

Answer 1

Works both for iPad and iPhone. Be able to hide and calculate index automatically.

Call self.setTabBarDotVisible(visible:true) if self is not an UITabBarController.

Call self.setTabBarDotVisible(visible:true, index:2) if self is an UITabBarController.

import UIKit

public extension UIViewController {

func setTabBarDotVisible(visible:Bool,index: Int? = nil) {

    let tabBarController:UITabBarController!

    if self is UITabBarController
    {
        tabBarController = self as! UITabBarController
    }
    else
    {
        if self.tabBarController == nil
        {
            return
        }
        tabBarController = self.tabBarController!
    }

    let indexFinal:Int

    if (index != nil)
    {
        indexFinal = index!
    }
    else
    {
        let index3 = tabBarController.viewControllers?.index(of: self)

        if index3 == nil
        {
            return;
        }
        else
        {
             indexFinal = index3!
        }

    }

    guard let barItems = tabBarController.tabBar.items else
    {
        return
    }

    //


    let tag = 8888

    var tabBarItemView:UIView?

    for subview in tabBarController.tabBar.subviews {

        let className = String(describing: type(of: subview))

        guard className == "UITabBarButton" else {
            continue
        }

        var label:UILabel?
        var dotView:UIView?

        for subview2 in subview.subviews {

            if subview2.tag == tag {
                dotView = subview2;
            }
            else if (subview2 is UILabel)
            {
                label = subview2 as? UILabel
            }

        }


        if label?.text == barItems[indexFinal].title
        {
            dotView?.removeFromSuperview()
            tabBarItemView = subview;
            break;
        }
    }

    if (tabBarItemView == nil || !visible)
    {
        return
    }



    let barItemWidth = tabBarItemView!.bounds.width

    let x = barItemWidth * 0.5 + (barItems[indexFinal].selectedImage?.size.width ?? barItemWidth) / 2
    let y:CGFloat = 5
    let size:CGFloat = 10;

    let redDot = UIView(frame: CGRect(x: x, y: y, width: size, height: size))

    redDot.tag = tag
    redDot.backgroundColor = UIColor.red
    redDot.layer.cornerRadius = size/2


    tabBarItemView!.addSubview(redDot)
}

}