ios - TabBarItem 角标(Badge)值未显示

Question

我写了这段代码，但它似乎不起作用，我不知道为什么，TabBarItem是正确的，但角标(Badge)没有显示。

let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let tabBarController = mainStoryboard.instantiateViewControllerWithIdentifier("TabBar") as! UITabBarController
let tabArray = tabBarController.tabBar.items as NSArray!
var chatItem = tabArray.objectAtIndex(3) as! UITabBarItem
chatItem.badgeValue = "1"

Answer 1

当你更新值时，你必须重新加载 tabBarController，所以这样做:

let tabBarController = self.storyboard?.instantiateViewControllerWithIdentifier("TabBar") as! TabsViewController // Your tabor controller
tabBarController.selectedIndex = 2 // Whatever your selected index

let tabArray = tabBarController.tabBar.items as NSArray!
let chatItem = tabArray.objectAtIndex(3) as! UITabBarItem
chatItem.badgeValue = "1"
var appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
appDelegate.window?.rootViewController = tabBarController