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swiftappdelegateuitabbaritem

Set UITabBarItem badge value in appDelegate

I've done a bunch of searching on this question, and found numerous answers to accomplish this in Objective-C. However, I've yet to find an answer that is in Swift.

I've tried translating the Objective-C, with the following code executed in didFinishLaunchingWithOptions:

if let rootViewController = self.window?.rootViewController {
    print("root")
    if let tabBarController = rootViewController.tabBarController {
        print("tab")
        let tabBarItem = tabBarController.tabBar.items![3]
        tabBarItem.badgeValue = "!"
    }
}

The code never prints "tab", so I'm obviously not accessing it correctly. Help?

Solution

  • Going on the assumption that your root view controller is actually the tab bar controller, you need to change:

    if let tabBarController = rootViewController.tabBarController {

    to:

    if let tabBarController = rootViewController as? UITabBarController {