选项卡栏中的导航栏中的按钮UIViewController未显示

Question

我似乎无法在导航栏中显示任何按钮.

流程:导航控制器 - >标签栏控制器 - > 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

我也尝试使用故事板添加它,但它在运行时没有显示.知道为什么我无法在导航栏中显示按钮

Answer 1

试试这样：

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