Question

我有一个带有5个标签的UITabBarController。通过按Tab键我想做一个简单的检查，以确定我的UITabBarController应该通过按Tab键显示哪个UIViewController。

最好的办法是什么？

Answer 1

试试这个

-(void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController {
    //here it provide the viewController
}

Answer 2

我认为您可以通过实施tabBarController(_:didSelect:)（符合UITabBarControllerDelegate）来实现您的目标。

它应该类似于（Swift 3）：

class ViewController: UIViewController, UITabBarControllerDelegate {
    //...

    override func viewDidLoad() {
        super.viewDidLoad()

        // don't forget to:
        tabBarController?.delegate = self
    }

    func tabBarController(_ tabBarController: UITabBarController, didSelect viewController: UIViewController) {
        // here, you can determine what's the selected view controller by checking "viewController":
        if viewController is ViewController {
            // the current selected view controller is "ViewController"
        }
    }

    //...
}

Answer 3

创建一个tabbar控制器类，将该类分配给tabbar并覆盖方法

override func tabBar(_ tabBar: UITabBar, didSelect item: UITabBarItem) {
   // your code 
}

UITabBarController如何通过按Tab键显示不同的UIViewController

3 个答案: