Objective-C 中的类可用性

Question

I'd like to mark an entire class as available only for iOS 13+. Is this possible?

I imagine running an availability check before using the class, like this:

if (@available(iOS 13, *)) {
    /* Use my special, iOS 13+ only class. */
}

Answer 1

Should be possible, just use the availability macros on your own class. Ie, put in API_AVAILABLE(ios(13.0)) before the @interface declaration. Or use the NS_CLASS_AVAILABLE macro the same way Apple does.