Object Oriented Programming
Initializer in Swift
An initializer is a special method used to build a class object on initialization (instantiation).
Known as a constructor in other languages.
Syntax
modifier class className {
init(inputParameters) {
//set fields and run methods needed on instantiation here
}
}Notes
With a method, if the first parameter is declared external, all other parameters are implicitly declared external.
Often times, a constructor's input parameters will have the same variable name as the variables within the class. Member variables within the class can be referenced using the 'self' keyword.
Example
public class City {
var cityName: String //fields
var population: Int
init(cityName: String, population: Int) { //constructor
self.cityName = cityName
self.population = population
}
}