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A common sample is to make use of respondsToSelector: to check out if a delegate item implements an optional system right before sending it that message. One example is:
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Main Knowledge will not be thread Harmless. The approach for that reason advised by Apple is to implement thread containment which entails creating a individually-managed object context for accessing Core Info objects on Each individual thread and having a one shared persistent keep coordinator.
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Q: Exactly what is a selector and what's its goal? Deliver an illustration of where by and how it might be used.
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