SWIFT如何创建NSCoding子类并从另一个类调用它？ [英] SWIFT How to create a NSCoding Subclass and call it from another class?

问题描述

我在NSCoding上发现了这个黑色代码，它几乎想要我想要它。我发现它的链接在下面。
如何在其他类中创建NSCoding类和用户？下面的代码不起作用。我希望有些人可以帮助我。

  import Foundation 
 import UIKit 
 
 
 class用户：NSObject，NSCoding {
 var name：String 
 
 init（name：String）{
 self.name = name 
} 
 
 required init（coder aDecoder：NSCoder）{
 
 self.name = aDecoder.decodeObjectForKey（name）as String 
} 
 
 func encodeWithCoder（aCoder：NSCoder）{
 aCoder.encodeObject（name，forKey：name）
} 
} 
 
 
 //新类我要设置并获取对象
 
 class MyNewClass：UIViewController {
 
 let user = User（name：Mike）
 let encodedUser = NSKeyedArchiver.archivedDataWithRootObject（user）
 let decodingUser = NSKeyedUnarchiver.unarchiveObjectWithData（encodedUser）as User 
 
} 
 
 //http://stackoverflow.com/questions/24589933/nskeyedunarchiver-fails-to-decode-a- custom-object-in-swift 
  

解决方我将此限制为一个字符串参数来存储到文件。但是你可以有更多不同的类型。您可以将其粘贴到单个swift文件中，并将其用作ViewController并添加要测试的类。它演示了如何使用带有快速语法的NSCoding来保存和检索对象中的数据。

  import UIKit 
 import Foundation 
 
 class ViewController：UIViewController {
 
 override func viewDidLoad（）{
 super.viewDidLoad（）
 
 var instanceData = Data（）
 instanceData.name =testName
 ArchiveData（）。saveData（nameData：instanceData）
 let retrieveData = ArchiveData（）。retrieveData（）as Data 
 println（retrieveData.name）
 
} 
} 
 
类数据：NSObject {
 
 var name：String =
 
 func encodeWithCoder（aCoder：NSCoder！）{
 aCoder.encodeObject（name，forKey：name）
} 
 
 init（coder aDecoder：NSCoder！）{
 name = aDecoder.decodeObjectForKey（name）as String 
} 
 
覆盖init（）{
} 
} 
 
类ArchiveData ：NSObject {
 
 var docume ntDirectories：NSArray = [] 
 var documentDirectory：String =
 var path：String =
 
 func saveData（#nameData：Data）{
 documentDirectories = NSSearchPathForDirectoriesInDomains（.DocumentDirectory，.UserDomainMask，true）
 documentDirectory = documentDirectories.objectAtIndex（0）as String 
 path = documentDirectory.stringByAppendingPathComponent（data.archive）
 
 if NSKeyedArchiver.archiveRootObject（nameData，toFile：path）{
 // println（写入文件的成功！）
} else {
 println（无法写入文件！）
} 
} 
 
 func retrieveData（） - > NSObject {
 var dataToRetrieve = Data（）
 documentDirectories = NSSearchPathForDirectoriesInDomains（.DocumentDirectory，.UserDomainMask，true）
 documentDirectory = documentDirectories.objectAtIndex（0）as String 
 path = documentDirectory。 stringByAppendingPathComponent（data.archive）
如果让dataToRetrieve2 = NSKeyedUnarchiver.unarchiveObjectWithFile（path）为？数据{
 dataToRetrieve = dataToRetrieve2 as Data 
} 
 return（dataToRetrieve）
} 
} 
  

I found this black of code on NSCoding and it almost does want I want it to. the link for where I found it is below. How do I create a NSCoding class and user in in other classes? The below code dies not work. I hope some can help me with this.

import Foundation
import UIKit


class User: NSObject, NSCoding {
    var name: String

    init(name: String) {
        self.name = name
    }

   required init(coder aDecoder: NSCoder) {

        self.name = aDecoder.decodeObjectForKey("name") as String
    }

    func encodeWithCoder(aCoder: NSCoder) {
        aCoder.encodeObject(name, forKey: "name")
    }
}


//new class where I want to set and get the object

class MyNewClass: UIViewController {

    let user = User(name: "Mike")
    let encodedUser = NSKeyedArchiver.archivedDataWithRootObject(user)
    let decodedUser = NSKeyedUnarchiver.unarchiveObjectWithData(encodedUser) as User

}

//http://stackoverflow.com/questions/24589933/nskeyedunarchiver-fails-to-decode-a-custom-object-in-swift

解决方案

I'm cutting and pasting from my own project below. I have limited this to one string parameter to store to file. But you can more of different types. You can paste this into a single swift file and use it as the ViewController plus added classes to test. It demonstrates using NSCoding with swift syntax to save and retrieve data in an object.

import UIKit
import Foundation

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        var instanceData = Data()
        instanceData.name = "testName"
        ArchiveData().saveData(nameData: instanceData)
        let retrievedData = ArchiveData().retrieveData() as Data
        println(retrievedData.name)

    }
}

class Data: NSObject {

    var name: String = ""

    func encodeWithCoder(aCoder: NSCoder!) {
        aCoder.encodeObject(name, forKey: "name")
    }

    init(coder aDecoder: NSCoder!) {
        name = aDecoder.decodeObjectForKey("name") as String
    }

    override init() {
    }
}

class ArchiveData:NSObject {

    var documentDirectories:NSArray = []
    var documentDirectory:String = ""
    var path:String = ""

    func saveData(#nameData: Data) {
        documentDirectories = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
        documentDirectory = documentDirectories.objectAtIndex(0) as String
        path = documentDirectory.stringByAppendingPathComponent("data.archive")

        if NSKeyedArchiver.archiveRootObject(nameData, toFile: path) {
            //println("Success writing to file!")
        } else {
            println("Unable to write to file!")
        }
    }

    func retrieveData() -> NSObject {
        var dataToRetrieve = Data()
        documentDirectories = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
        documentDirectory = documentDirectories.objectAtIndex(0) as String
        path = documentDirectory.stringByAppendingPathComponent("data.archive")
        if let dataToRetrieve2 = NSKeyedUnarchiver.unarchiveObjectWithFile(path) as? Data {
            dataToRetrieve = dataToRetrieve2 as Data
        }
        return(dataToRetrieve)
    }
}

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