How do you create a delegate object?

How do you create a delegate object?

An Objective-C delegate is an object that has been assigned to the delegate property another object. To create one, you define a class that implements the delegate methods you’re interested in, and mark that class as implementing the delegate protocol.

What is delegate pattern in Swift?

The delegate pattern has long been very prominent on Apple’s platforms. 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.

Which design pattern will control the creation of an object based on a established interface while allowing the concrete implementation to determine the subclass to construct?

Factory Method is a creational design pattern that provides an interface for creating objects in a superclass, but allows subclasses to alter the type of objects that will be created.

Which design pattern would you use to control the creation of an object?

Creational design patterns solve this problem by somehow controlling this object creation. Creational design patterns are composed of two dominant ideas.

Where is chain of responsibility pattern used?

Chain of Responsibility is often used in conjunction with Composite. In this case, when a leaf component gets a request, it may pass it through the chain of all of the parent components down to the root of the object tree. Handlers in Chain of Responsibility can be implemented as Commands.

What are the parts of a delegation pattern?

This pattern has three parts: An object needing a delegate, also known as the delegating object. It’s the object that has a delegate. The delegate is usually held as a weak property to avoid a retain cycle where the delegating object retains the delegate, which retains the delegating object.

How does an object handle a delegation request?

In delegation, an object handles a request by delegating to a second object (the delegate ). The delegate is a helper object, but with the original context. With language-level support for delegation, this is done implicitly by having self in the delegate refer to the original (sending) object, not the delegate (receiving object).

How does the delegate refer to the original object?

The delegate is a helper object, but with the original context. With language-level support for delegation, this is done implicitly by having self in the delegate refer to the original (sending) object, not the delegate (receiving object).

Which is an example of delegation in Kotlin?

In the example below (using the Kotlin programming language), the class Window delegates the area () call to its internal Rectangle object (its delegate). Some languages have special support for delegation built in.