What is a delegate in OBJC?
A delegate is an object that acts on behalf of, or in coordination with, another object when that object encounters an event in a program. The delegating object is often a responder object—that is, an object inheriting from NSResponder in AppKit or UIResponder in UIKit—that is responding to a user event.
What is datasource and delegate?
The datasource supplies the data, the delegate supplies the behavior. In MVC, datasource is in the model layer and the delegate is in the control layer.
What is a delegate in swift programming?
Delegates are extremely common in iOS development, but fortunately they are easy to understand: a delegate is any object that should be notified when something interesting has happened.
What is delegate and protocol in iOS?
Protocols are like interfaces in Java. They are a concrete feature of the Objective-C language. Delegates, however, are objects which are connected to other objects and are sent messages when the state of that “other object” changes. They are just a pattern.
What is difference between protocol and delegate in Swift?
Protocol is a set of methods (either optional or required) that would be implemented by the class which conforms to that protocol. While, delegate is the reference to that class which conforms to that protocol and will adhere to implement methods defined in protocol.
What is protocol and delegate in Swift 5?
In Swift, declaring a delegate property is just like declaring any other property and you specify the protocol name as the type of the property. You may notice the question mark syntax which indicates that it’s a property with an optional value (there may or may not be an object assigned to it).
What is cellForRowAt?
tableView(_:cellForRowAt:) Asks the data source for a cell to insert in a particular location of the table view.
What is Diffable data source?
A diffable data source object is a specialized type of data source that works together with your table view object. It provides the behavior you need to manage updates to your table view’s data and UI in a simple, efficient way.
What is a delegate in Salesforce?
The delegate is an object that is delegated control of the user interface for that event, or is at least asked to interpret the event in an application-specific manner.
What is a delegate object in iOS?
A delegate is an object that acts on behalf of, or in coordination with, another object when that object encounters an event in a program. The delegating object is often a responder object—that is, an object inheriting from NSResponder in AppKit or UIResponder in UIKit—that is responding to a user event.
What is a delegate in AppKit?
The delegate object itself is typically, but not necessarily, an object, often a custom object, that controls some part of the application (that is, a coordinating controller object). The following AppKit classes define a delegate:
What is a delegating class?
The delegating class has an outlet or property, usually one that is named delegate; if it is an outlet, it includes methods for setting and accessing the value of the outlet. It also declares, without implementing, one or more methods that constitute a formal protocol or an informal protocol.