[英]Swift: How to access a tab bar item by pressing a nav bar button
我目前有一个CustomTabBarController类和一个CustomNavBarController类。
标签栏有五个标签,可以正常工作。 导航栏类在导航栏的右侧添加了三个按钮(主页/消息/配置文件)。 单击主页按钮时,将触发以下功能。
CustomNavBarController.swift(只有tappedHome功能)
func tappedHome(sender: UIButton) {
// Go to home page (tab bar index 0)
}
这是我的AppDelegate和CustomTabBar文件。
AppDelegate.swift
window?.rootViewController = CustomTabBarController()
let tabBar: UITabBarController = self.window?.rootViewController as! UITabBarController
tabBar.selectedIndex = 0
CustomTabBarController.swift
class CustomTabBarController: UITabBarController, UITabBarControllerDelegate {
override func viewDidLoad() {
super.viewDidLoad()
self.delegate = self
self.viewControllers = [createDummyNavControllerWithTitle("News", imageName: "icon_news", viewController: MainController()),
createDummyNavControllerWithTitle("Games", imageName: "icon_games", viewController: GamesController()),
createDummyNavControllerWithTitle("Students", imageName: "icon_students", viewController: StudentsController()),
createDummyNavControllerWithTitle("Ranking", imageName: "icon_rank", viewController: StatsController()),
createDummyNavControllerWithTitle("Info", imageName: "icon_info", viewController: InfoController())]
}
func tabBarController(tabbarController: UITabBarController, didSelectViewController viewController: UIViewController) {
self.title = viewController.title
}
// Shortcut function for the tab bar items
private func createDummyNavControllerWithTitle(title: String, imageName: String, viewController: UIViewController) -> UINavigationController {
viewController.title = title
let navController = UINavigationController(rootViewController: viewController)
navController.tabBarItem.title = title
navController.tabBarItem.image = UIImage(named: imageName)?.imageWithRenderingMode(UIImageRenderingMode.AlwaysOriginal)
return navController
}
}
单击主页按钮时,如何告诉CustomNavBarController.swift中的函数加载选项卡栏的第一个索引?
PS:之所以我想有两种方法可以返回首页,是因为选项卡栏在每种情况下都不可见。
在您的tappedHome(_:)
方法中执行以下代码应该可以解决问题:
let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
let tabBarController = appDelegate.window!.rootViewController as! UITabBarController
tabBarController.selectedIndex = 0
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