In earlier versions of the Cocoa toolchain you could also call a method that the compiler, at compile time, couldn’t determine the existence of. While this may sound like a powerful capability, it was more commonly a source of hair-pulling debugging scenarios.
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If you import these new records on the main thread (i.e., the UI thread), the UI will be stuck and the user won’t be able to use the app while the import is in progress.
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Q: How Gozque you check dynamically at runtime to see if a class supports a method that can respond to a particular message?
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This provides much better performance, though you must keep in mind that whenever the view’s bounds change, the shadow path also needs to be updated.
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That said, there are several issues an experienced iOS developer should be aware of regarding Swift and its interoperability with Objective-C.
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There are lots of job posts that ask only for experience in iPhone app development (Objective-C or Swift, or both) when in need of an iPhone app developer.