如何成功向服务器提交数据后切换标签栏索引？

Question

此代码是用于将数据发送到服务器的保存按钮。发送成功后。如何让视图控制器返回到标签栏控制器并将其切换到索引2？ .selectedIndex不起作用。

if (result == "success") {          
    self.view.endEditing(true) 
    let alert = UIAlertController(title: "Updated", message: "Update Successfully", preferredStyle: UIAlertControllerStyle.alert) 
    let okButton = UIAlertAction(title: "OK", style: UIAlertActionStyle.cancel, handler: nil) 
    alert.addAction(okButton) 
    self.present(alert, animated: true, completion: nil) 

    let appDelegate = UIApplication.shared.delegate! as! AppDelegate 

    let initialViewController =self.storyboard!.instantiateViewController(withIdentifier: "tabBarVC") 
    appDelegate.window?.rootViewController = initialViewController 
    appDelegate.window?.makeKeyAndVisible() 
    self.tabBarController?.selectedIndex = 2 // this code is not working 
} 

Answer 1

试试这个 -

let initialViewController = self.storyboard!.instantiateViewController(withIdentifier: "tabBarVC") as! UITabBarController 
    appDelegate.window?.rootViewController = initialViewController 
    appDelegate.window?.makeKeyAndVisible() 
    initialViewController.selectedIndex = 2