. When an object is in use by One more object it’s retain depend goes up; when it is not being used by any objects, its keep count reverts to zero.
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1 Observe of caution: These sample questions are intended basically for a tutorial. Not every “A” applicant really worth choosing can appropriately solution them all, nor does answering all of them ensure an “A” candidate.
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NSError objects have an error area, an mistake code, and person info dictionary for additional info. This additional facts may possibly contain, as an example, a localized description and Restoration suggestion, so later code can display that for the user.
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A classification is a way to extend an existing class and is also an alternative choice to the usage of subclasses. The principle difference amongst subclassing and groups is usually that a classification provides functionality to an present course alone which happens to be then available anyplace within your code that employs that course or its subclasses.
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