Returning from threading/ GCD/ completion handler
1
I have some logic to sign a user in from a login screen. If the login fails, I want to display a message to let the user know. If the user logs in successfully, I trigger a segue. When I test it with invalid credentials, the error alert displays as expected but the segue is still being triggered even though it's nested in an if-else statement. Why is this? How can I return out of it and avoid the else block...? I tried adding 'return' under the DispatchQ/ show alert code and that didn't have any effect. self.login(username: usernameTextField.text!, password: passwordTextField.text!) { (error) in if error != nil { DispatchQueue.main.async { self.showAlert(msg: error ?? "error") } } else { DispatchQueue.main.async