A chance to Examine dynamically at runtime if a class supports a method is often significantly practical with delegates (see the next query On this guide) that will have optional approaches a developer can elect to employ or not.
Not employing a reuse identifier appropriately. The default habits each time a table is scrolled is usually that table cells that go offscreen are deallocated and new cells are produced for the new content material that is definitely shown. If you use a reuse identifier, when a cell goes off screen It isn't deallocated and alternatively cached for reuse.
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Q: How could you Look at dynamically at runtime to view if a class supports a method that could reply to a particular concept?
If a new cell is to look Together with the exact same reuse identifier, the cached cell is made use of along with the expensive operation of allocating and laying out an entirely new cell is averted. Rather the cached cell will have to only be reconfigured to Screen the new information, like updating the textual content and image that is definitely displayed.
To ensure that a managed object context to take in variations from Core Data objects on A further thread quickly, it must be observing the NSManagedObjectContextDidSaveNotification. As soon as this notification takes place, the object can merge the improvements using the mergeChangesFromContextDidSaveNotification: approach.
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