Swift prevent storyboard segue from happening

Question

Intro

I am creating a Swift 2.0 app in which an action can be performed only a certain number of times, say 8. In order to accomplish this behavior, I need to cancel a certain segue, performAction, should it be triggered via pressing a button linked to it on storyboard.

Research

I ran across questions like http://stackoverflow.com/questions/8066525/prevent-segue-in-prepareforsegue-method, which suggested code like:

override func shouldPerformSegueWithIdentifier(identifier: String,sender: AnyObject?) -> Bool {

     return true
 }

Implementation

I implemented it like:

override func shouldPerformSegueWithIdentifier(identifier: "createCard" ,sender: AnyObject?) -> Bool {
    if amountOfTimes > 8 { //To be triggered if the segue should be cancelled
        return false
    } else {
    return true
    }
}

However I get the error

Expected ',' seperator

How can I have the segue be cancelled should amountOfTimes be greater than 8?

ronatory · Accepted Answer · 2016-03-26T15:34:35.847

2

To check if your identifier is "createdCard" use the shouldPerformSegueWithIdentifiermethod like this:

override func shouldPerformSegueWithIdentifier(identifier: String ,sender: AnyObject?) -> Bool {

    return !(identifier == "createCard" && amountOfTimes > 8)

}

edited Mar 26 '16 at 15:34

answered Mar 26 '16 at 15:28

ronatory

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Thank you! Will try once I am at a computer again. – rocket101 Mar 26 '16 at 15:30
1

You should prefer `return !(identifier == "createCard" && amountOfTimes > 8)` instead of an unnecessary `if`. – Sulthan Mar 26 '16 at 15:31
you're 100% right @Sulthan will edit the answer. Thanks – ronatory Mar 26 '16 at 15:32

score 1 · Answer 2 · answered Mar 26 '16 at 15:58

The problem is this phrase:

identifier: "createCard"

That is not Swift. This is not a function call, it is a function implementation. You must say:

identifier: String

identifier is not a value you set, it's a value you receive. You can then look to see if it is "createCard", but you do not get to claim that it is.

score 0 · Answer 3 · edited Apr 26 '20 at 13:32

0

Click on First ViewController's Round Yellow/White icon (highlighted left side in image) and hold drag to next ViewController (ex. SubmitOTPVC). Then write this code in swift file:

 self.performSegue(withIdentifier: "otpVC", sender: nil)

here otpVC is the identifier name of segue.

edited Apr 26 '20 at 13:32

David Buck

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answered Apr 26 '20 at 13:03

Clean Coder

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Swift prevent storyboard segue from happening

3 Answers3