以编程方式选择选项卡栏项（不使用UITabBarController）

Question

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

Answer 1

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

我认为这很快就会：

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

Answer 2

斯威夫特3：

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

Answer 3

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

Answer 4

如果你在UITabBarController中你可以使用self.selectedIndex = // set target index

Answer 5

Before select active tab bar item on viewDidLoad event

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

Answer 6

在Xamarin.ios中，我们可以像这样使用mainTabBarController.selectedIndex = 3;