The Builder pattern in Swift is like a fine tailor for your objects. It helps in constructing complex objects step by step, avoiding messy constructors with too many parameters. By using a nested Builder class within your object class, you can incrementally set properties through a fluent API. This approach enhances code readability and maintainability, especially for objects with numerous and potentially optional properties. It's like assembling a Lego set piece by piece, resulting in a clean and customized object creation process.
class Car {
var brand: String?
var model: String?
var horsepower: Int?
// more properties here
class Builder {
private var car = Car()
func withBrand(_ brand: String) -> Builder {
car.brand = brand
return self
}
func withModel(_ model: String) -> Builder {
car.model = model
return self
}
func withHorsepower(_ horsepower: Int) -> Builder {
car.horsepower = horsepower
return self
}
// more builder methods here
func build() -> Car {
return car
}
}
}
// Usage
let myCar = Car.Builder()
.withBrand("Swift Motors")
.withModel("Swift GT")
.withHorsepower(300)
.build()