［已解决］swift中UITabBarItem的字体太小

［背景］

代码：

        //create tabs
        let viewMessage         = MessageViewController()
        let viewContact         = ContactViewController()
        let viewFile            = FileViewController()
        let viewPersonalCenter  = PersonalCenterViewController()

        let nvcMessage = UINavigationController(rootViewController: viewMessage)
        nvcMessage.tabBarItem = UITabBarItem(title: mainTabs[0], image: UIImage(named:"message_unselected.png"), tag:0)
        let nvcContact = UINavigationController(rootViewController: viewContact)
        nvcContact.tabBarItem = UITabBarItem(title: mainTabs[1], image: UIImage(named:"contact_unselected.png"), tag:1)
        let nvcFile = UINavigationController(rootViewController: viewFile)
        nvcFile.tabBarItem = UITabBarItem(title: mainTabs[2], image: UIImage(named:"file_unselected.png"), tag:2)
        let nvcPersonalCenter = UINavigationController(rootViewController: viewPersonalCenter)
        nvcPersonalCenter.tabBarItem = UITabBarItem(title: mainTabs[3], image: UIImage(named:"personal_center_unselected.png"), tag:3)



        self.viewControllers = [nvcMessage, nvcContact, nvcFile, nvcPersonalCenter]
        //default select message index 0
        self.selectedIndex = 0

结果使得：

1.搜：

UITabBarItem font size

参考：

iphone – How to change the Color of text in UITabBarItem in iOS 5 – Stack Overflow

iphone – Changing font in UITabBarItem – Stack Overflow

搜：

swift setTitleTextAttributes font

 参考：

uitabbar – Changing tab bar font in Swift – Stack Overflow

Customizing UIBarButtonItem in Swift – Stack Overflow

最后用：

        let barItemFont = UIFont.systemFontOfSize(18)

        let nvcMessage = UINavigationController(rootViewController: viewMessage)
        nvcMessage.tabBarItem = UITabBarItem(title: mainTabs[0], image: UIImage(named:"message_unselected.png"), tag:0)

        nvcMessage.tabBarItem.setTitleTextAttributes([NSFontAttributeName: barItemFont], forState: UIControlState.Normal)

 使的字体变大了：

［总结］

UITabBarItem的字体默认小，通过：

nvcMessage.tabBarItem.setTitleTextAttributes([NSFontAttributeName:UIFont.systemFontOfSize(18)], forState: UIControlState.Normal)

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