我想在 swift 4 中以编程方式从 uiviewcontroller 导航到 uitabbarcontroller？

Question

我想从控制器（不是 uitabbarcontroller 的一部分）导航到 uiviewcontroller（是 uitabbarcontroller 的一部分）如何实现？

Answer 1

使用故事板转场

在 UIViewController 和 UITabBarController 之间设置 segue 并执行它。

---

以编程方式

只需使用控制器

呈现某些 UITabBarController 的新实例

let tabBarController = // instantiate it (add controllers if needed)
present(tabBarController, animated: true)

---

从故事板实例化

let storyboard = UIStoryboard(name: "Main", bundle: nil)
let instantiated = storyboard.instantiateViewController(withIdentifier: "identifier")
if let tabBarController = instantiated as? UITabBarController {
    present(tabBarController, animated: true)
}

UITabBarController 的子类，具有 nib 的实例化方法

class TabBarController: UITabBarController {

    class func instantiate(with controllers: [UIViewController]) -> TabBarController {
        let controller = TabBarController(nibName: "TabBarController", bundle: nil)
        controller.viewControllers = controllers
        return controller
    }

}

用法（不要忘记设置每个控制器的UITabBarItem）：

present(TabBarController.instantiate(with: controllers), animated: true)

Answer 2

    let tabBar = self.storyboard?.instantiateViewController(withIdentifier: "yourTabBarStoryboardId") as! UITabBarController
    self.present(tabBar, animated: true) {
        //This selected index will be the index of your view controller you want to present
        tabBar.selectedIndex = 1
    }