ios - 如何以编程方式使用 Swift 3 在所有 View Controller 中显示标签栏？

Question

我是 Swift 的新手。如何在不使用 Storyboard 的情况下以编程方式在 swift 3 中的所有 View Controller 中显示选项卡栏？

场景如下

1.我有 3 个带有标签栏的 View Controller (例如 view1、view2、view3)

2.当我点击 view2 中的一个按钮时，它导航到另一个 View Controller (比如说 view4)并且在 view4 中标签栏没有出现

我在 View Controller 中添加了标签栏(假设是 homeView)

这是我在 homeView 的 viewDidLoad() 中的代码

// Create Tab one
      let homeviewController = view1()
      let homeTabBarItem = UITabBarItem(title: nil, image: UIImage(named: "iconHome"), selectedImage: UIImage(named: "iconHome@3x"))
      homeviewController.tabBarItem = homeTabBarItem
      homeviewController.tabBarItem.imageInsets = UIEdgeInsetsMake(6, 0, -6, 0)

    // Create Tab two
    let categoryviewController = view2()
    let categoryTabBarItem = UITabBarItem(title: nil, image: UIImage(named: "iconBrowse"), selectedImage: UIImage(named: "iconBrowse@3x"))
    categoryviewController.tabBarItem = categoryTabBarItem
    categoryviewController.tabBarItem.imageInsets = UIEdgeInsetsMake(6, 0, -6, 0)

    // Create Tab three
    let userprofviewController = view3()
    let userTabBarItem = UITabBarItem(title: nil, image: UIImage(named: "iconProfile@3x"), selectedImage: UIImage(named: "iconProfile"))
    userprofviewController.tabBarItem = userTabBarItem
    userprofviewController.tabBarItem.imageInsets = UIEdgeInsetsMake(6, 0, -6, 0)


    UITabBar.appearance().barTintColor = UIColor.black
    UITabBar.appearance().itemPositioning = .fill
    self.viewControllers = [homeviewController, categoryviewController, userprofviewController]

提前致谢

Answer 1

不是直接把viewControllers拿来self.viewControllers，而是像下面这样拿UINavigationController，

    // Create Tab one
    let homeviewController = view1()
    let homeTabBarItem = UITabBarItem(title: nil, image: UIImage(named: "iconHome"), selectedImage: UIImage(named: "iconHome@3x"))
    homeviewController.tabBarItem = homeTabBarItem
    homeviewController.tabBarItem.imageInsets = UIEdgeInsetsMake(6, 0, -6, 0)
    let navHome = UINavigationController.init(rootViewController: homeviewController)

    // Create Tab two
    let categoryviewController = view2()
    let categoryTabBarItem = UITabBarItem(title: nil, image: UIImage(named: "iconBrowse"), selectedImage: UIImage(named: "iconBrowse@3x"))
    categoryviewController.tabBarItem = categoryTabBarItem
    categoryviewController.tabBarItem.imageInsets = UIEdgeInsetsMake(6, 0, -6, 0)
    let navCategory = UINavigationController.init(rootViewController: categoryviewController)

    // Create Tab three
    let userprofviewController = view3()
    let userTabBarItem = UITabBarItem(title: nil, image: UIImage(named: "iconProfile@3x"), selectedImage: UIImage(named: "iconProfile"))
    userprofviewController.tabBarItem = userTabBarItem
    userprofviewController.tabBarItem.imageInsets = UIEdgeInsetsMake(6, 0, -6, 0)
    let navUserPrfl = UINavigationController.init(rootViewController: userprofviewController)


    UITabBar.appearance().barTintColor = UIColor.black
    UITabBar.appearance().itemPositioning = .fill
    self.viewControllers = [navHome, navCategory, navUserPrfl]