Swift prototype design sample – The.Swift.Dev.

This can also be a creational design sample, it’s helpful when you’ve got a really primary configuration for an object and you need to offer (clone) these predefined values to a different one. Principally you make clones from a prototype objects. 😊😊😊

This method has some advantages, one is for instance that you do not have to subclass, however you’ll be able to configure clones individually. This additionally means which you could take away a bunch of boilerplate (configuration) code if you will use prototypes. 🤔

class Paragraph {

    var font: UIFont
    var colour: UIColor
    var textual content: String

    init(font: UIFont = UIFont.systemFont(ofSize: 12),
         colour: UIColor = .darkText,
         textual content: String = "") {

        self.font = font
        self.colour = colour
        self.textual content = textual content
    }

    func clone() -> Paragraph {
        return Paragraph(font: self.font, colour: self.colour, textual content: self.textual content)
    }
}

let base = Paragraph()

let title = base.clone()
title.font = UIFont.systemFont(ofSize: 18)
title.textual content = "That is the title"

let first = base.clone()
first.textual content = "That is the primary paragraph"

let second = base.clone()
second.textual content = "That is the second paragraph"

As you’ll be able to see the implementation is only a few traces of code. You solely want a default initializer and a clone technique. Every little thing might be pre-configured for the prototype object within the init technique and you can also make your clones utilizing the clone technique, however that is fairly apparent at this level… 🤐

Let’s check out another instance:

class Paragraph {

    var font: UIFont
    var colour: UIColor
    var textual content: String

    init(font: UIFont = UIFont.systemFont(ofSize: 12),
         colour: UIColor = .darkText,
         textual content: String = "") {

        self.font = font
        self.colour = colour
        self.textual content = textual content
    }

    func clone() -> Paragraph {
        return Paragraph(font: self.font, colour: self.colour, textual content: self.textual content)
    }
}

let base = Paragraph()

let title = base.clone()
title.font = UIFont.systemFont(ofSize: 18)
title.textual content = "That is the title"

let first = base.clone()
first.textual content = "That is the primary paragraph"

let second = base.clone()
second.textual content = "That is the second paragraph"

The prototype design sample can also be useful if you’re planning to have snapshots of a given state. For instance in a drawing app, you may have a form class as a proto, you can begin including paths to it, and sooner or later at time you may create a snapshot from it. You’ll be able to proceed to work on the brand new object, however this gives you the flexibility to return to a saved state at any level of time sooner or later. 🎉

That is it in regards to the prototype design sample in Swift, in a nuthsell. 🐿