Errors while using shouldPerformSegue(withIdentifier, sender) method in swift4

Question

What I\'m trying to do:

• checking a condition, if the condition is true, perform segue as normal. If condition is false, call the shouldPerformSegue method and retu

Answer 1

If you want to perform logic to decide if a segue should be "performed" or not, you need to override shouldPerformSegue. This will allow the OS to (1) kick off things properly and (2) for you to be able to decide if the segue gets done.

override func shouldPerformSegue(withIdentifier identifier: String, sender: Any?) -> Bool {
    if [criteria met to perform segue] {
        return true
    } else {
        return false
    }
}