ios - 如何在 ios swift 中以编程方式将 Storyboard View Controller 加载到标签栏 Controller 中？

Question

我有以编程方式完成的标签栏 Controller 。标签栏工作正常。在 stroyboard 中，我创建了 firstViewController 并分配了类名 firstViewController。当我尝试在选项卡栏 Controller 上的第一个 vc 上使用选项卡导航到第一个 View Controller 时，它崩溃了。如果我以编程方式给出意味着它工作正常。

如何以编程方式从标签栏 Controller 导航到 Storyboard View Controller 。

这是我的标签栏 Controller 代码:

 let tabBarCnt = UITabBarController()
 func createTabBarController() {

    let firstVC = FViewController()
    firstVC.tabBarItem = UITabBarItem(tabBarSystemItem: .search, tag: 0)

    let secondVC = SViewController()
    secondVC.tabBarItem = UITabBarItem(tabBarSystemItem: .more, tag: 1)

    let thirdVC = ViewController()
    thirdVC.tabBarItem = UITabBarItem(tabBarSystemItem: .history, tag: 2)

    let fourthVC = ViewController()
    fourthVC.tabBarItem = UITabBarItem(tabBarSystemItem: .downloads, tag: 3)


    if UIDevice.current.userInterfaceIdiom == .pad {
        let controllerArray = [firstVC, secondVC, thirdVC, fourthVC]
        tabBarCnt.viewControllers = controllerArray.map{ UINavigationController.init(rootViewController: $0)}

        self.view.addSubview(tabBarCnt.view)
    } else {
        let controllerArray = [firstVC, secondVC]
        tabBarCnt.viewControllers = controllerArray.map{ UINavigationController.init(rootViewController: $0)}

        self.view.addSubview(tabBarCnt.view)
    }

}

这是我的 firstViewController 代码的第一个 VC:

import UIKit

class FViewController: UIViewController, UITabBarDelegate {

@IBOutlet weak var firstBtn: UIButton!

@IBOutlet weak var fview: UIView!
override func viewDidLoad() {
    super.viewDidLoad()

    self.view.backgroundColor =  UIColor.blue
 // self.fview.backgroundColor = .brown


    // Do any additional setup after loading the view.
   }


}

Answer 1

请尝试以下代码。您可以通过界面生成器提供 View Controller 标识符。

let tabBarCnt = UITabBarController()
func createTabBarController() {
let storyboard = UIStoryboard(name: "MainStoryboard", bundle: nil)
let firstVC = storyboard?.instantiateViewControllerWithIdentifier("FViewController")
firstVC.tabBarItem = UITabBarItem(tabBarSystemItem: .search, tag: 0)

let secondVC = storyboard?.instantiateViewControllerWithIdentifier("SViewController")
secondVC.tabBarItem = UITabBarItem(tabBarSystemItem: .more, tag: 1)

let thirdVC = storyboard?.instantiateViewControllerWithIdentifier("ViewController")
thirdVC.tabBarItem = UITabBarItem(tabBarSystemItem: .history, tag: 2)

let fourthVC = storyboard?.instantiateViewControllerWithIdentifier("ViewController")
fourthVC.tabBarItem = UITabBarItem(tabBarSystemItem: .downloads, tag: 3)

   var controllerArray = [firstVC, secondVC]
if UIDevice.current.userInterfaceIdiom == .pad {
      controllerArray += [thirdVC, fourthVC]        
} 
     tabBarCnt.viewControllers = controllerArray.map{ UINavigationController.init(rootViewController: $0)}
    self.view.addSubview(tabBarCnt.view)
}