What is difference between datasource and delegate?
A data source is almost identical to a delegate. The difference is in the relationship with the delegating object. Instead of being delegated control of the user interface, a data source is delegated control of data.
What is delegate protocol?
Delegates are a use of the language feature of protocols. The delegation design pattern is a way of designing your code to use protocols where necessary. In the Cocoa frameworks, the delegate design pattern is used to specify an instance of a class which conforms to a particular protocol.
What is the use of delegation mechanism in IOS app?
Delegation provides a way for your custom object to communicate application-specific behavior to the off-the-shelf object. The programming mechanism of delegation gives objects a chance to coordinate their appearance and state with changes occurring elsewhere in a program, changes usually brought about by user actions.
What are delegates in Xcode?
A delegate is an object that another class can pass messages to. In practice delegate classes have to conform to a delegate protocol.
What is Table View delegate?
The delegate of an UITableView object must adopt the UITableViewDelegate protocol. Optional methods of the protocol allow the delegate to manage selections, configure section headings and footers, help to delete and reorder cells, and perform other actions. All the methods are described in the following.
What is a data delegate?
A delegate is an object-oriented, managed, secure and type-safe function pointer in the . Rather than passing data, a delegate passes a method to another method. Delegates are used in many contexts, including implementing callbacks and event handlers, entry thread points and multiple types of method specifications.
What are protocols Objective-C?
Objective-C allows you to define protocols, which declare the methods expected to be used for a particular situation. This chapter describes the syntax to define a formal protocol, and explains how to mark a class interface as conforming to a protocol, which means that the class must implement the required methods.
What is delegate and datasource in Swift?
The data source provides information about what to display, like how many rows, and what goes in each row. The delegate tells the tableview what to do when the user selects a row, or whether the user is allowed to edit a row, and other things like that.
What is the use of delegate in Swift?
Delegation is used for everything from handling table view events using UITableViewDelegate , to modifying cache behavior using NSCacheDelegate . The core purpose of the delegate pattern is to allow an object to communicate back to its owner in a decoupled way.
Why do we use delegates in Swift?
The core purpose of the delegate pattern is to allow an object to communicate back to its owner in a decoupled way. By not requiring an object to know the concrete type of its owner, we can write code that is much easier to reuse and maintain.
How do delegates work in Swift?
The Delegate Pattern in Swift The name Delegate comes from the concept of delegating control (giving control to something else). In Swift, a delegate is a controller object with a defined interface that can be used to control or modify the behavior of another object.
