CODEWITHSUNDEEP
swiftuinavigationcontroller
Manuel
Manuel

Reputation: 15042

UINavigationController always responds to selector interactivePopGestureRecognizer?

In my UINavigationController I check, if it has a property interactivePopGestureRecognizer before I set it like so:

class UINavigationControllerExtended: UINavigationController, UIGestureRecognizerDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()

        if self.respondsToSelector(Selector("interactivePopGestureRecognizer")) {
            self.navigationController?.interactivePopGestureRecognizer?.delegate = self
        }
    }
}

The property can be set to nil but the property would still exists, so I would assume respondsToSelector always returns true. Is it necessary to check this at all?

Upvotes: 1

Views: 709

Answers (1)

vacawama
vacawama

Reputation: 154621

The interactivePopGestureRecognizer property was added in iOS 7. It make no sense to check if it exists with respondsToSelector. Just use it.

Because you are calling it with optional chaining, if the interactivePopGestureRecognizer property is nil, then:

self.navigationController?.interactivePopGestureRecognizer?.delegate = self

will safely do nothing.

Upvotes: 2

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