Swift NSKeyedArchiver

来源：互联网发布：数据库的主键是什么编辑：程序博客网时间：2024/05/19 04:02

import UIKitclass ViewController: UIViewController {    override func viewDidLoad() {        super.viewDidLoad()        let filePath = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true)[0] + "/person.dat"        //归档        let data = NSMutableData()        let archiver = NSKeyedArchiver.init(forWritingWithMutableData: data)        let array = ["1","2","3"]        archiver.encodeObject(array, forKey:"arr")        archiver.encodeInt(20, forKey: "age")        archiver.finishEncoding()        data.writeToFile(filePath, atomically: true)        //反归档        let unarchiverData = NSData(contentsOfFile: filePath)        let unarchiver = NSKeyedUnarchiver.init(forReadingWithData: unarchiverData!)        let decodeData = unarchiver.decodeObjectForKey("arr") as! NSArray        let decodeAge = unarchiver.decodeIntForKey("age")        NSLog("%@", decodeData)        NSLog("%d", decodeAge)    }}

1.在带键的归档中，每个归档字段都有一个key值，解归档时key值要与归档时key值匹配
2.带键归档可以一次存储多个对象
3.归档的对象是Foundation框架中的对象
4.归档和解归档其中任意对象都需要归档和解归档整个文件
5.归档后的文件是加密的，所以归档文件的扩展名可以随意取

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