[英]SWIFT How to create a NSCoding Subclass and call it from another class?
我在NSCoding上發現了這黑碼,幾乎想要我這樣做。 我找到它的鏈接在下面。 如何在其他類中創建NSCoding類和用戶? 下面的代碼死了不起作用。 我希望有人可以幫助我。
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
我正在從下面的我自己的項目中剪切和粘貼。 我將其限制為一個字符串參數以存儲到文件。 但是您可以使用更多不同的類型。 您可以將其粘貼到單個swift文件中,並將其用作ViewController以及添加的類進行測試。 它演示了將NSCoding與swift語法一起使用來保存和檢索對象中的數據。
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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