This can also be a creational design sample, it’s helpful when you’ve a really fundamental configuration for an object and you need to offer (clone) these predefined values to a different one. Mainly you make clones from a prototype objects. 😊😊😊
This strategy has some advantages, one is for instance that you do not have to subclass, however you possibly can configure clones individually. This additionally means that you may take away a bunch of boilerplate (configuration) code if you will use prototypes. 🤔
class Paragraph {
var font: UIFont
var shade: UIColor
var textual content: String
init(font: UIFont = UIFont.systemFont(ofSize: 12),
shade: UIColor = .darkText,
textual content: String = "") {
self.font = font
self.shade = shade
self.textual content = textual content
}
func clone() -> Paragraph {
return Paragraph(font: self.font, shade: self.shade, 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 possibly can see the implementation is only a few strains of code. You solely want a default initializer and a clone technique. Every part will probably be pre-configured for the prototype object within the init technique and you may make your clones utilizing the clone technique, however that is fairly apparent at this level… 🤐
Let’s check out yet one more instance:
class Paragraph {
var font: UIFont
var shade: UIColor
var textual content: String
init(font: UIFont = UIFont.systemFont(ofSize: 12),
shade: UIColor = .darkText,
textual content: String = "") {
self.font = font
self.shade = shade
self.textual content = textual content
}
func clone() -> Paragraph {
return Paragraph(font: self.font, shade: self.shade, 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 in case you are planning to have snapshots of a given state. For instance in a drawing app, you might have a form class as a proto, you can begin including paths to it, and sooner or later at time you might create a snapshot from it. You possibly can proceed to work on the brand new object, however this provides you with the power 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. 🐿