A category is a way to extend an present class and is particularly an alternative to using subclasses. The leading distinction amongst subclassing and groups is usually that a group provides features to an present course itself which happens to be then offered anywhere as part of your code that uses that course or its subclasses.
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Overly sophisticated look at hierarchies. Though You should use the varied UIViews to produce tailor made cells, this has the opportunity to degrade functionality whether it is overused or will get extremely elaborate. Although this is becoming considerably less of an issue While using the rising speed of supported iOS gadgets, it however can effect scrolling functionality in some devices and situations.
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NSError objects have an mistake domain, an mistake code, and consumer info dictionary For extra info. This extra info could contain, such as, a localized description and Restoration suggestion, so later on code can Display screen that into the consumer.