无法在视图控制器的标签栏上设置默认按钮

Question

我的View Controller底部有一个UITabBar。此选项卡栏根据选择的选项卡执行不同的功能。我想在view controller加载时选择其中一个按钮。我无法找到一个不涉及tabbarviewcontroller

的解决方案

Answer 1

class ViewController: UIViewController, UITabBarDelegate {
@IBOutlet var tabBar : UITabBar
//In view controller declare a UITabBar as an Outlet
override func viewDidLoad() {
    super.viewDidLoad()
    tabBar.selectedItem = tabBar.items[0] as UITabBarItem;// here you 
    can load the default button option which you want to load                            
 }
func tabBar(tabBar: UITabBar!, didSelectItem item: UITabBarItem!) {
    var tabBarValue = 0;
    switch item.tag  {
    case 0:
        tabBarValue = // assign value 
        break
    case 1:
        tabBarValue = // assign value 
        break
    default:
       break
    }}

PL。请参阅以下网址，他们尝试为所选标签加载不同的网页浏览Use a UITabBar without UITabBarController to control a UIWebView

Answer 2

这是我的解决方案。

for i in tabBar.items as [UITabBarItem] {
        if i.tag == 0 {
            tabBar.selectedItem = i
        }