从 UITabBarController 初始化 viewController [英] Initialize viewControllers from a UITabBarController

问题描述

我有一个 UITabBarController.使用界面生成器，我添加了多个视图控制器.这些 viewController 都是同一个类，但唯一改变的是参数.

I have a UITabBarController. Using interface builder I'm adding multiple view controllers. These viewControllers are all the same class but the only thing that changes is a paramenter.

我想扩展 UITabBarController 以便在视图控制器初始化时添加此参数，但我不知道如何在 UITabBarController 扩展中执行此操作.在哪里做这件事的正确地方???

I want to extend the UITabBarController so I can add this parameter when the view controllers are initialized but I have no clue how to do this in the UITabBarController extension. Where is the right place to do this???

推荐答案

我也遇到过这样的问题，我想在选项卡栏控制器的第五个选项卡中显示弹出视图控制器，我用过这个:

i also faced issue like that, in which i want to show pop over view controller in fifth tab of tab bar controller, i used this:

func tabBarController(_ tabBarController: UITabBarController, shouldSelect viewController: UIViewController) -> Bool {

    if(viewController == tabBarController.viewControllers?[4]){
        let storyboard : UIStoryboard = UIStoryboard(name: "AfterLogin", bundle: nil)
        let vc = storyboard.instantiateViewController(withIdentifier: "MorePopUpVC")
        vc.modalPresentationStyle = .popover
        let popover = vc.popoverPresentationController
        popover?.delegate = self
        popover?.permittedArrowDirections = .down
        popover?.sourceView = self.tabBar
        popover?.sourceRect = ((self.orderedTabBarItemViews()).last?.frame)!
        vc.preferredContentSize = CGSize(width: 120, height: 132)
        present(vc, animated: true, completion:nil)
        return false
    }
    return true
}

这是我如何更改第五个标签的操作，

this is how i change action of fifth tab,

你可以像这样使用它:

func tabBarController(_ tabBarController: UITabBarController, shouldSelect viewController: UIViewController) -> Bool {

        let storyboard : UIStoryboard = UIStoryboard(name: "YOUR STORYBOARD NAME", bundle: nil)
        let vc = storyboard.instantiateViewController(withIdentifier: "YOUR VIEW CONTROLLER IDENTIFIER")
        if(viewController == tabBarController.viewControllers?[4]){
            vc.type = "PARAMETER YOU WANT"
        }
        present(vc, animated: true, completion:nil)
        return false
}

我认为它有帮助.

这篇关于从 UITabBarController 初始化 viewController的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！