相关疑难解决方法(0)

我需要从文本文件中读取和写入数据,但我无法弄清楚如何.

我在Swift的iBook中找到了这个示例代码,但我仍然不知道如何编写或读取数据.

import Cocoa

class DataImporter
{
    /*
    DataImporter is a class to import data from an external file.
    The class is assumed to take a non-trivial amount of time to initialize.
    */
    var fileName = "data.txt"
    // the DataImporter class would provide data importing functionality here
}

class DataManager
{
    @lazy var importer = DataImporter()
    var data = String[]()
    // the DataManager class would provide data management functionality here
}

let manager = DataManager()
manager.data += "Some data"
manager.data …