CODEWITHSUNDEEP
iosswift
David Seek
David Seek

Reputation: 17152

How to check if current UIViewController is part of UINavigationController

In my App the UIViewController "ProfilVC" is part of the UINavigationController "nav".

But in another Scene, i'm presenting "ProfilVC" to reuse the same UIViewController but with different data.

let vc = tweetsStb.instantiateViewController(withIdentifier: "ProfilVC") as! ProfilVC
self.present(vc, animated: true, completion: nil)

Within didSelectRowAt, I'm presenting another UIViewController. And here I need to check if self (ProfilVC) is currently part of the nav or presented on top.

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {

    let vc = tweetsStb.instantiateViewController(withIdentifier: "TweetCommentsVC") as! TweetCommentsVC
    let post = tweets[(indexPath as NSIndexPath).section]
    let cell = tableView.cellForRow(at: indexPath) as! TweetPostCell
    vc.commentCounterString = cell.commentLabel.text!
    vc.post = post
    vc.avatare = avatare
    nav?.present(vc, animated: true, completion: nil)
}

This code works perfect if ProfilVC is part of nav.

But I need self.present(vc, animated: true, completion: nil) if ProfilVC is presented on top.

What I need is something like this:

if(nav?.topViewController?.isKind(of: ProfilVC.self) != nil) {
    nav?.present(vc, animated: true, completion: nil)
} else {
    self.present(vc, animated: true, completion: nil)
}

The problem with this code is, that ProfilVC is always part of nav. I need to check if ProfilVC as "self"/"the current visible one" is part of nav or presented on top...

What is the best approach to accomplish my wanting? Help is very appreciated.

PS: Present the second instance of ProfilVC within nav is no option because I need ProfilVC in this case to overlapp the UINavigationBar of nav.

Upvotes: 2

Views: 1422

Answers (1)

Josh Homann
Josh Homann

Reputation: 16347

Every ViewController has a navigationController property. This property is nil if the ViewController is not part of a navigation stack.

Upvotes: 7

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