Swift 懒加载写法

创建数组的三种懒加载写法

 lazy var titlesArray: [String] = ["1","1","1"] 

//初始化空数组
 lazy var titlesArray: [String] = [Sring]()

 lazy var titlesArray: [String] = {
    let titles = ["1","1","1"]
    return titles
}()