· 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 be a creational design sample, it’s helpful when you’ve a really primary configuration for an object and also you’d like to offer (clone) these predefined values to a different one. Principally you’re making clones from a prototype objects. 😊😊😊
This method has some advantages, one is for instance that you simply don’t must subclass, however you may configure clones individually. This additionally means that you could 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 may see the implementation is only a few traces of code. You solely want a default initializer and a clone technique. Every part will likely be pre-configured for the prototype object within the init technique and you may make your clones utilizing the clone technique, however that’s fairly apparent at this level… 🤐
Let’s check out yet another 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 be useful if you’re planning to have snapshots of a given state. For instance in a drawing app, you possibly can have a form class as a proto, you can begin including paths to it, and in some unspecified time in the future at time you possibly can create a snapshot from it. You possibly can proceed to work on the brand new object, however this will provide you with 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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