A selector could be the mechanism applied to pick out a technique to execute for an object, or even the exclusive identifier that replaces the identify once the resource code is compiled. A selector functions similar to a dynamic perform pointer that points to your implementation of a category’ system.
The ability to Verify dynamically at runtime if a class supports a way is often especially valuable with delegates (see the subsequent problem In this particular guide) that could have optional solutions a developer can decide to employ or not.
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Managed item context is made use of to be able to build and keep a set of managed objects in Swift. It also provides - undo and redo functions.
An incredible example of delegation may be the UITableView object that is usually utilised each time a desk is rendered within the monitor. The UITableView employs two distinct delegates:
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