ios - 标签栏 UIViewController 中导航栏中的按钮未显示

Question

我似乎无法让任何按钮出现在我的导航栏中。

流程:Navigation Controller -> Tab bar Controller -> ViewController(想把按钮放在这里)

我尝试在 ViewDidLoad 中以编程方式添加它:

let navigationBar = navigationController!.navigationBar
    navigationBar.tintColor = UIColor.blackColor()

let leftButton =  UIBarButtonItem(title: "Left Button", style: UIBarButtonItemStyle.Plain, target: self, action: nil)
let rightButton = UIBarButtonItem(title: "Right Button", style: UIBarButtonItemStyle.Plain, target: self, action: nil)

    navigationItem.leftBarButtonItem = leftButton
    navigationItem.rightBarButtonItem = rightButton

我也尝试过使用 Storyboard添加它，但它在运行时不显示。知道为什么我不能让按钮出现在导航栏中

Answer 1

试试这样:

self.tabBarController?.navigationItem.leftBarButtonItems = [leftButton]