What is Delegate design pattern in IOS?

According to Apple: Delegation is a simple and powerful pattern in which one object in a program acts on behalf of, or in coordination with, another object. The delegating object keeps a reference to the other object–the delegate–and at the appropriate time sends a message to it.

What is the delegate pattern 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.

What is IOS delegate?

Delegation is a simple and powerful pattern in which one object in a program acts on behalf of, or in coordination with, another object. The delegating object keeps a reference to the other object—the delegate—and at the appropriate time sends a message to it.

What are delegates and protocols in IOS?

What exactly are protocols and delegates and how are they used in IOS?

delegates implement protocols (another name for interfaces)
object registers a delegate (that implements a protocol)
object can call protocol methods on the delegate.

How do you call a delegate in Swift?

Key Steps to Delegation

Create a delegate protocol that defines the messages sent to the delegate.
Create a delegate property in the delegating class to keep track of the delegate.
Adopt and implement the delegate protocol in the delegate class.
Call the delegate from the delegating object.

How do I use delegates in Swift?

The basic steps to use delegation are the same for both Objective-C and Swift:

Create a delegate protocol that defines the messages sent to the delegate.
Create a delegate property in the delegating class to keep track of the delegate.
Adopt and implement the delegate protocol in the delegate class.

When to use Swift delegation in iOS development?

Written by Reinder de Vries on August 5 2020 in App Development, iOS, Swift Delegation, also known as the Delegate pattern, is frequently used in practical iOS development. It’s a must-have in your iOS developer’s toolbox, and today we’re going to figure out how delegation works.

Which is an example of a delegate in iOS?

In the example, we called makeCookie () ourselves. This would set of a chain of events that leads to the bakery providing a cookie to the shop. In practical iOS development, the bakery would bake cookies on its own. That’s out of our control, so we need a delegate to respond to these events.

What does delegation mean in the Apple documentation?

The official Apple documentation defines delegation as: Delegation is a design pattern that enables a class to hand off (or “delegate”) some of its responsibilities to an instance of another class. That’s quite complex, so let’s break it down… Think about delegation in the real world.

What is the advantage of a delegate design pattern?

The advantage of the delegate design pattern is loose coupling. It enables class A (the delegate) to depend on class B (the delegating class) without class B having to have any knowledge of class A. This ensures that the dependency relationship is one-way only, rather than being circular.

What is Delegate design pattern in IOS? According to Apple: Delegation is a simple and powerful pattern in which one object in a program acts on behalf of, or in coordination with, another object. The delegating object keeps a reference to the other object–the delegate–and at the appropriate time sends a message to it. What…