     }
     
     private var _selectionTitleColors: [Bool: UIColor] = [true: UIColor(hex: "4A4A4A"), false: UIColor(hex: "CCCCCC")]
-    private var _selectionTitleFonts: [Bool: UIFont] = [true: UIFont(name: "PingFangSC-Semibold", size: DefaultTitleFontSize)!, false: UIFont(name: "PingFangSC-Semibold", size: DefaultTitleUnselectedFontSize)!]
+    private var _selectionTitleFonts: [Bool: UIFont] = [true: /*UIFont(name: "PingFangSC-Semibold", size: DefaultTitleFontSize)!*/UIFont.boldSystemFont(ofSize: DefaultTitleFontSize), false: /*UIFont(name: "PingFangSC-Semibold", size: DefaultTitleUnselectedFontSize)!*/UIFont.boldSystemFont(ofSize: DefaultTabNavigationItemFontSize)]
     
     public func setTitleColor(_ titleColor: UIColor, whenSelected selected: Bool) {
         _selectionTitleColors[selected] = titleColor

    let label = T()
    label.text = "AL"
    label.translatesAutoresizingMaskIntoConstraints = false
    label.font = font ?? UIFont(name: "PingFangSC-Semibold", size: DefaultTitleFontSize)
    label.textColor = .clear
    label.backgroundColor = .clear
    return label

        let button = _TabNavigationItemButton(type: .system)
        button.translatesAutoresizingMaskIntoConstraints = false
        button.backgroundColor = UIColor.clear
        button.titleLabel?.font = /*UIFont(name: "PingFangSC-Semibold", size: DefaultTabNavigationItemFontSize)*/UIFont.boldSystemFont(ofSize: DefaultTabNavigationItemFontSize)
        return button
    }()
    
