Select a tab bar item programmatically (not using UITabBarController)

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I have a view derived from UIViewControler (not UITabBarController). In this view I added a tab bar with several tab bar items. I used the UITabBarDelegate to allow the view to do something when users tap on each tab bar item.

class MyViewController: UIViewController, UITabBarDelegate {

    func tabBar(tabBar: UITabBar, didSelectItem item: UITabBarItem!) {
        // do something
    }
}

My question is how we can programmatically select the first tab bar item when the view is first loaded? Note that I would want the first tab item to be in "active" state also.

Again, I'm not using UITabBarController

Thanks

[tabBar setSelectedItem: [tabBar.items objectAtIndex:0]];

Which in swift, I think would be:

tabBar.selectedItem = tabBar.items![0] as UITabBarItem

UITabBarController Programmatically - Satinder Singh, UITabBarControllers are a great way to navigate between your view controllers. You use tab bar controller to organize your app into one or more distinct modes of operation. Notice we are setting the tabBarItem of each viewController. however, it does not seem quite right without the navigation bar. // Use the view controller reference to select the second tab tabBarController.selectedViewController = searchVC // Use the array index to select the third tab tabBarController.selectedIndex = 2 Depending on the structure of your app, you can use the view property of a UITabBarController instance to show it on screen.

Swift 3:

tabBarController.selectedIndex = 0 // (or any other existing index)

tabBarController(_:didSelect:), Tells the delegate that the user selected an item in the tab bar. in the tab bar and is not called when your code changes the tab bar contents programmatically. Below is step by step guide to create UITabBarController Programmatically in swift. Steps to create UITabBarController programatically in swift. Step 1: Create a new project using “SingleView App” template. We are not going to use “Tabbed App” template for our tutorial, as we will create UITabBarController programmatically in swift.

In swift if tabbar is used not tabbarcontroller set default select

var tabbar:UITabBar?//if declare like this

tabbar!.selectedItem = self.tabbar!.items![0] as? UITabBarItem

or

let tabbar = UITabBar()//if declare and initilize like this

tabbar.selectedItem = self.tabbar.items![0] as? UITabBarItem

UITabBar, Tapping an item selects and highlights that item, and you use the selection of the item When creating a tab bar programmatically, use the initWithFrame: method or When a tab bar controller is not present, drag tab bar items from the library  In versions of iOS prior to version 3.0, this property reflects the index of the selected tab bar item only. Attempting to set this value to an index of a view controller that is not visible in the tab bar, but is instead managed by the More navigation controller, has no effect. Note. The More interface is not available in tvOS.

if you inside UITabBarController you can useself.selectedIndex = // set target index

iPhone: how to select a UITabBarItem programmatically – Studio , A category to mark all posts, in order to let the posts to be linked by a menu item. iPhone: how to select a UITabBarItem programmatically. I'm working to an iPhone application with a TabBar on the footer area. If the user is not currently logged in, in the “Home” view a warning message is displayed. Please Note: The tab bar has limited space for displaying your custom items. If you add six or more custom view controllers to a tab bar controller, the tab bar controller displays only the first four items plus the standard More item on the tab bar. Tapping the More item brings up a standard interface for selecting the remaining items.

Before select active tab bar item on viewDidLoad event

[self.tabBar setSelectedItem: [self.tabBar.items objectAtIndex:0]];

Working With Tab Bar Controllers In Swift (How To) – LearnAppMaking, In this article, you'll learn how to use tab bar controllers on iOS with Swift. Use the view controller reference to select the second tab tabBarController. This tab bar item, of class UITabBarItem , determines what attributes are items. And last but not least, the UITabBarItem class has a few convenience  Tab bars and tab bar controllers in Xamarin.iOS. 03/21/2017; 10 minutes to read; In this article. Tabbed applications are used in iOS to support user interfaces where multiple screens can be accessed in no particular order. Through the UITabBarController class, applications can easily include support for such multi-screen scenarios.

How to Create a Swipeable UITabBar From the Ground Up, This tutorial explains why creating a custom, swipeable UITabBar in iOS can be tricky, One of these cases is UITabBar, where you do not have the ability to swipe between need two placeholders/empty view controllers for the tabbar, to make tab bar items, Variable prevIndex is used to store the last selected index. Tab Bar Controllers. You use tab bar controller to organize your app into one or more distinct modes of operation. The view hierarchy of a tab bar controller is self contained. It is composed of views that the tab bar controller manages directly and views that are managed by content view controllers you provide.

Problem adding tab bar items to UITabBar, Switching to a TabBar tab view programmatically?, tabBarController Thanks. Select a tab bar item programmatically (not using UITabBarController), [tabBar  In addition, it is called only in response to user taps in the tab bar and is not called when your code changes the tab bar contents programmatically. In versions of iOS prior to version 3.0, this method is called only when the selected view controller actually changes. In other words, it is not called when the same view controller is selected.

iOS, iOS | Tab Bar with XCode IDE Introduction, History and Versions, Views and or more bar button items in a tab bar for selecting between different subtasks, This attribute cannot be set if the background image for the tab bar is not To set the style programmatically, we must use the barStyle property of UITabBar class. Control-drag from the tab bar controller to the new view controller, release the mouse button, and select view controllersfrom the Relationship Seguesection of the small pop-up window that appears. Select the view controller (the controller we have just add). Click the tab bar item at the bottom or in the Document Outline.

Comments
  • Thanks Foster. I actually have to write this code: tabBar.selectedItem = tabBar.items![0] as UITabBarItem However, I would want to simulate the "tap" event on the first tab. Is that possible?
  • I'm not sure what you mean. Are you saying the delegate method tabBar(_:didSelectItem:) isn't called when you do tabBar.selectedItem = tabBar.items![0] as UITabBarItem ?
  • Yes. That's what I meant. That code just set the tab as "active" and doesn't fire tabBar(_:didSelectItem:)
  • Directly modifying a tab bar managed by a tab bar controller is not allowed. Got the exception!! What worked for me is: self.tabBarController?.tabBar.selectedItem = 2
  • @Foster Bass : calling the tabBar(_:didSelectItem:) method goes against its purpose because this method must be fired automatically by its delegate definition.
  • as? UITabBarItem is redundant, at least for newer versions of Swift, and you will get the warning: Conditional cast from 'UITabBarItem' to 'UITabBarItem' always succeeds