Applying a technique that usually takes an NSError indicates using an optional variable (a variable that may or may not exist) as well as unwrapping the error if it exists.
An excellent example of delegation may be the UITableView item that is typically used each time a table is rendered over the display screen. The UITableView employs two diverse delegates:
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. When an item is in use by another object it’s retain depend goes up; when it is not being used by any objects, its retain rely reverts to zero.
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