A category is a method to extend an current course and is an alternative choice to the usage of subclasses. The key difference between subclassing and categories is the fact a classification provides operation to an existing class itself and that is then readily available everywhere in your code that uses that course or its subclasses.
The ability to check dynamically at runtime if a class supports a method is often particularly handy with delegates (see another dilemma With this information) which will have optional approaches a developer can decide to apply or not.
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As an example, the popular string object in Goal-C is NSString and it's got a mutable subclass NSMutableString. Whenever you make use of a category to extend the NSString class, each NSString and NSMutableString item in the code will aid these new techniques.
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Luckily, Swift can reap the benefits of everything written in Objective-C, so that you can create a new Swift task and nevertheless make the most of any current code foundation.
To ensure that a managed object context to absorb changes from Main Information objects on A further thread instantly, it should be observing the NSManagedObjectContextDidSaveNotification. As soon as this notification happens, the object can merge the modifications utilizing the mergeChangesFromContextDidSaveNotification: approach.
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Main Info is not really thread Safe and sound. The technique thus advisable by Apple is to use thread containment which involves creating a independently-managed object context for accessing Main Facts objects on Every single thread and possessing a one shared persistent retailer coordinator.
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The developer could possibly retailer a small quantity of facts in NSUserDefault, but they must know that that shouldn't be applied for giant quantities of data.
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