swift2.0单例

import Foundation

public  class  SwiftSingleton{
    var name =  "000"
    public  static  let instance = SwiftSingleton()  //这个位置使用 static，static修饰的变量会懒加载

    private  init(){
        print( "create SwiftSingleton..." );
    }
}

然后看测试：

override func viewDidLoad() {
        super.viewDidLoad()

        print( "viewDidload" );
        let s1 = SwiftSingleton.instance
        let s2 = SwiftSingleton.instance

        s1.name =  "s1"
        s2.name =  "s2"

        print( "s1.name:\(s1.name)   s2.name:\(s2.name)" )
    }

打印结果：

viewDidload

create SwiftSingleton...

s1.name:s2   s2.name:s2

 

从打印结果来看，这个单例确实是懒加载的，而且，确实是单例。

OK了