ios - moreNavigationController 在 UITabBarController 中始终为 nil

Question

我正尝试在我的 UITabBarController 中自定义“更多”按钮的标题，因为我正在用另一种语言开发该应用程序。我将 UITabBarController 子类化，以便能够访问 tabBarController 属性。不幸的是，无论我将它放在viewDidLoad 还是viewDidAppear(_) 中，它总是nil。关于如何编辑它有什么想法吗？

import UIKit

class ControllerVC: UITabBarController {

    let uiManager = UIManager()

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    override func viewDidAppear(_ animated: Bool) {
        if let tabBarItem = tabBarController?.moreNavigationController.tabBarItem {
            let deselectedImage = tabBarItem.image
            let selectedImage = tabBarItem.selectedImage
            tabBarController!.moreNavigationController.tabBarItem = UITabBarItem(title: "بیشتر", image: deselectedImage, selectedImage: selectedImage)
        } else {
            uiManager.showActivityIndicator(self)
        }
    }

}

Answer 1

问题不在于 moreNavigationController。问题出在 tabBarController 上。您的类是 UITabBarController。标签栏 Controller 的 tabBarController 属性始终为 nil。

只是做:

let tabBarItem = moreNavigationController.tabBarItem
let deselectedImage = tabBarItem.image
let selectedImage = tabBarItem.selectedImage
moreNavigationController.tabBarItem = UITabBarItem(title: "بیشتر", image: deselectedImage, selectedImage: selectedImage)