· 1 min learn
The prototype design sample is used to create clones of a base object, so let’s have a look at some sensible examples written in Swift.
This can also be a creational design sample, it’s helpful when you may have a really fundamental configuration for an object and also you’d like to present (clone) these predefined values to a different one. Principally you’re making clones from a prototype objects. 😊😊😊
This strategy has some advantages, one is for instance that you simply don’t must subclass, however you may configure clones individually. This additionally means you can take away a bunch of boilerplate (configuration) code if you’re going to 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 may see the implementation is only a few strains of code. You solely want a default initializer and a clone methodology. All the pieces shall be pre-configured for the prototype object within the init methodology and you may make your clones utilizing the clone methodology, however that’s fairly apparent at this level… 🤐
Let’s check out yet one more 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 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’ll be able to proceed to work on the brand new object, however this gives you the power to return to a saved state at any level of time sooner or later. 🎉
That’s it concerning the prototype design sample in Swift, in a nuthsell. 🐿
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