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iosswiftswift-protocolsswift-extensions

How can I add protocol to an element from interfacebuilder in Swift?

If I have an instance of UILabel in storyboard and I have it connected to view controller as IBOutlet. If I want add some functionality only to this label, how can I do it? I know that for obj-c you make a subclass of UILabel. But I wonder if there is better approach in swift.

Is it possible for this specific label to conform to some protocol that I'll make.

Solution

  • You can declare a private extension in the same file you're using the UILabel

    private extension UILabel {}

    In this case only the components in the same file can use the new feature. I know, it's a kind of workaround, but in my cases where I create a single file per each component, it works.

    Pay attention that the protocol conformance has to be public, so you can't use the private access level

    EDIT: since you need a special configuration for only one UILabel in a single file, this way won't allow it. Subclassing is the only solution