The selector may very well be applied having an occasion of each from the classes to invoke its run approach, While the implementation could possibly be pretty diverse for each.

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In order for a managed object context to soak up changes from Main Facts objects on One more thread promptly, it needs to be observing the NSManagedObjectContextDidSaveNotification. As soon as this notification occurs, the item can merge the adjustments utilizing the mergeChangesFromContextDidSaveNotification: strategy.

This may use exactly the same for Android. In case the iOS developer is aware of Android growth, they can construction the code to ensure that it may be reused with Android as well.

The ability to Verify dynamically at runtime if a class supports a technique may be significantly beneficial with delegates (see another question During this guidebook) that could have optional methods a developer can choose to employ or not.

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The solution Here's to work with a placeholder price or image and load the info asynchronously inside the history. Once the facts is loaded, a information can then be despatched to the primary thread to update the suitable cells.

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A standard reason behind exc_bad_access faults that are not detectable via the compiler is trying to obtain launched objects. In such circumstances, enabling NSZombies in Xcode can be a good debugging technique. Enabling NSZombies retains objects that may Generally be produced alive as “zombies”.

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