IOS: learning notes, Swift namespace

IOS: learning notes, Swift namespace
In Swift, namespace is implemented using class (extension) nesting. The following is a simple example to demonstrate the copy code /// main. swift // SwiftNameSpace /// Created by yao_yu on 14-8-1. // Copyright (c) 2014 yao_yu. all rights reserved. /// Swift namespace use the instance // import Foundation // defines the top-level namespace class YY {}// defines the second-level namespace Testextension YY {class Test in the YY namespace {}}// define the point class extension YY in the second-layer namespace. test {class Point2d {var x: Double = 0 var y: Double = 0 init (_ x: Double, _ y: Double) {self. x = x self. y = y }}func main () {// use point var pt = YY. test. point2d (123,333) println ("Point coordinate is (\ (pt. x), \ (pt. y) ") // The result is the coordinate (123.0, 333.0)} main ()