index当前点击的是哪个item

extension UITabBar {
    
    
    func reloadLayout(index: Int) {
        var temp: UIView?

        for button in subviews {
            for sub in button.subviews {
                
                if NSStringFromClass(sub.classForCoder) == "_UIBadgeView" {
                    temp = sub
                    break
                }
            }
        }
        guard let badgeView = temp else {
            return
        }
        badgeView.layer.transform = CATransform3DIdentity
        badgeView.layer.transform = index == 2 ? CATransform3DMakeTranslation(1, -13, 1) : CATransform3DMakeTranslation(1, 1, 1)
    }
    
}