error with very basic example - swift - Attempt to present on whose view is not in the window hierarchy
error with very basic example - swift - Attempt to present on whose view is not in the window hierarchy
I'm practicing with a basic example of alerts, it's two ViewControllers, each one has a button to go to the next or return, and another button to show an Alert
I added a Simple Alert in the ViewControler1 and it works fine, but if I add a Simple Alert in the ViewControler2 it does not work and shows the following error:
2018-09-12 16: 23: 43.107112-0500 proyect1 [74831: 1130476] Warning: Attempt to present on whose view is not in the window hierarchy!
Code viewController1:
import UIKit
class ViewController1: UIViewController
@IBAction func btnAlerta1 (_ sender: UIButton)
let alert = UIAlertController (style: .alert, title: "Verify your data", message: "Enter your email and password correctly")
alert.addAction (title: "Ok", color: .black, style: .default) action in
alert.show ()
override func viewDidLoad ()
super.viewDidLoad ()
Code viewController2:
import UIKit
class ViewController1: UIViewController
@IBAction func btnAlerta2 (_ sender: UIButton)
let alert = UIAlertController (style: .alert, title: "Verify your data", message: "Enter your email and password correctly")
alert.addAction (title: "Ok", color: .black, style: .default) action in
alert.show ()
override func viewDidLoad ()
super.viewDidLoad ()
And if I go back to the ViewController1 and wish to invoke the Simple Alert that worked before, now it does not work and it presents the same error!
could you help me?
show()
UIAlertController
@OOPer
.show() used to be a method on a UIAlertView()– Carpsen90
Sep 12 '18 at 22:54
.show()
UIAlertView()
@Carpsen90, The OP is using
UIAlertController, not UIAlertView. The class having show() methods is deprecated and UIAlertController does not have the method named show(). One more, your answer seems to be the right way as documented.– OOPer
Sep 12 '18 at 22:56
UIAlertController
UIAlertView
show()
UIAlertController
show()
@OOPer exactly, it's probably due to an old tutorial
– Carpsen90
Sep 12 '18 at 22:59
@Carpsen90, just not an old tutorial. Without some extension defining
show(), the OP's code does not compile. So, he/she has found a bad site showing the extension which seemingly works in very limited condition. You should better be discouraged to use such a thing.– OOPer
Sep 12 '18 at 23:04
show()
0
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There's no
show()method inUIAlertController. If you are using some sort of extension, that's the reason you get such error. Do as in the doc.– OOPer
Sep 12 '18 at 22:49