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iphone - What's the difference between -existingObjectWithID:error: and –objectWithID:?

in Technique[技术] by (71.8m points)

What's the difference between -existingObjectWithID:error: and –objectWithID: ?

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I believe existingObjectWithID:error: returns an instance only if it has already been registered with the receiving context. objectWithID: may return a fault for an object that has not yet been registered (pulled into) the receiving context.


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