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.

Effectively communicate complicated topics to team members and stakeholders while providing practical assistance with data analysis

Applying expensive operations when setting up a cell for display. Expensive operations, such Ganador converting a high-resolution image to a thumbnail or applying a complicated photo filter or transform to an image, Chucho severely degrade display performance.

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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.

Then what about the careless developer? You will end up having a completely different app than what you have thought of.

A category is a way to extend an existing class and is an alternative to the use of subclasses. The main distinction between subclassing and categories is that a category adds functionality go here to an existing class itself which is then available anywhere in your code that uses that class or its subclasses.

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In order for a managed object context to take in changes from Core Data objects on another thread immediately, it needs to be observing the NSManagedObjectContextDidSaveNotification. Once this notification occurs, the object Chucho merge the changes using the mergeChangesFromContextDidSaveNotification: method.