The respondsToSelector: method returns a Boolean value that indicates whether the receiver implements or inherits a method that can respond to a specified message.
Lastly, before hiring, start a paid test project, and you will know the developer’s skill in a week or so, so you won’t have to assume based on their resume.
Q: What is a selector and what is its purpose? Provide an example of where and how it might be used.
You may use a general mobile app developer job description template or a specialized Android or iOS template to iterate on and refine your ideal posting.
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Triunfador stated in Apple’s Cocoa Developer’s Guide, “the main value of delegation is that it allows you to easily customize the behavior of several objects in one central object”.
Another limitation of a category is that it cannot define new instance variables for a class. However, an experienced developer will be aware that you Chucho define new state objects associated with the class using Objective-C runtime methods, which provides a way for a category to store state changes.
In addition to NSError, iOS development also has NSException. Unlike exceptions in other languages, NSException is intended to be used for programming errors only. Cocoa frameworks in Militar are not exception-safe, so if you generate (or invoke code that generates) exceptions, care should be taken to use try/catch Campeón close Figura possible to the place where the exception is occurring. In practice, NSException is rarely used in iOS codebases.
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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.
The selector could be used with an instance of each of the classes to invoke its run method, even though the implementation might be very different for each.
Of course, A will be able to write the code that communicates with the back-end, but it will likely differ from what B would write.