Question

我想在swift 3中的按钮FROM View Controller TO标签栏控制器（Home）中实现segue / storyboard

这是我的代码

@IBAction func LogIn(_ sender: Any) {
    if self.emailTextfield.text == "" || self.passwordTextfield.text == "" {  
        let alertController = UIAlertController(title: "Error", message: "Please enter an email and password.", preferredStyle: .alert) 
        let defaultAction = UIAlertAction(title: "OK", style: .cancel, handler: nil)
        alertController.addAction(defaultAction)
        self.present(alertController, animated: true, completion: nil)
    } else {
        FIRAuth.auth()?.signIn(withEmail: self.emailTextfield.text!, password: self.passwordTextfield.text!) { (user, error) in
            if error == nil {
                print("You have successfully logged in")
                //this is my  storyboard but it gives me black screen
                let vc = self.storyboard?.instantiateViewController(withIdentifier: "Home")
                self.present(vc!, animated: true, completion: nil) 
            } else {
                let alertController = UIAlertController(title: "Error", message: error?.localizedDescription, preferredStyle: .alert)
                let defaultAction = UIAlertAction(title: "OK", style: .cancel, handler: nil)
                alertController.addAction(defaultAction)

                self.present(alertController, animated: true, completion: nil)
            }
        }
    }

}

我尝试使用故事板

    let vc = self.storyboard?.instantiateViewController(withIdentifier: "Home")
                self.present(vc!, animated: true, completion: nil)

我尝试使用segue

self.performSegue(withIdentifier: "Home", sender: self)

都给了我黑屏。为什么？我也有澄清。我应该在哪里连接我的segue，它是在标签栏控制器（灰色）还是第一个TAB控制器？

Answer 1

尝试以下步骤，

1）在AppDelegate类中创建新函数

func LoginNav()
{
        self.window = UIWindow(frame: UIScreen.main.bounds)
        let storyboard = UIStoryboard(name: "Main", bundle: nil)
        let mainViewController = storyboard.instantiateViewControllerWithIdentifier("MainTab") as! tabbarControllerViewController // U have to create tabbarControllerViewController for ur TabBarView
        self.window?.rootViewController = mainViewController
        self.window?.makeKeyAndVisible()

}

2）然后从任何视图控件中调用该函数，如下所示

let appDelegate = UIApplication.shared.delegate as! AppDelegate
appDelegate.LoginNav()

从ViewController到Tabbar Controller的Storyboard或segue

1 个答案: