我正在尝试使用NSKeyedUnarchiver类来取消归档我的自定义对象并不断收到错误。
Terminating app due to uncaught exception 'NSInvalidUnarchiveOperationException', reason: '*** -[NSKeyedUnarchiver decodeObjectForKey:]: cannot decode object of class (HelloAppleWatch.Note)'
Note类的代码如下所示:
import UIKit
class Note: NSObject,NSCoding {
var title :String?
override init() {}
required init(coder aDecoder: NSCoder) {
self.title = aDecoder.decodeObjectForKey("title") as String?
}
func encodeWithCoder(aCoder: NSCoder) {
aCoder.encodeObject(self.title, forKey: "title")
}
}
Unarchiving的代码如下所示:
let savedData = NSData(contentsOfURL: newURL)
let note = NSKeyedUnarchiver.unarchiveObjectWithData(savedData!) as Note?
更新:
func createNote() {
let note = Note()
note.title = self.noteTextField?.text
// archive the note object
let fileCoordinator = NSFileCoordinator(filePresenter: self)
fileCoordinator.coordinateWritingItemAtURL(presentedItemURL!, options: nil, error: nil) { ( newURL :NSURL!) -> Void in
let saveData = NSKeyedArchiver.archivedDataWithRootObject(note)
let success = saveData.writeToURL(newURL, atomically: true)
}
}
奇怪的是,当触发unarchive decodeObjectForKey时,它甚至不会执行Note.swift类。
答案 0 :(得分:1)
您的NSCoding代码看起来不错,但您的归档方法与我的不同。尝试使用此代码示例归档数据。下面是我使用的代码示例,它存储了我在swift
中创建的自定义类的可变阵列 func saveCustomData(data : NSMutableArray)
{
var filemgr : NSFileManager
var docsDir : String
var dirPaths : NSArray
filemgr = NSFileManager.defaultManager()
dirPaths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true) as NSArray
docsDir = dirPaths[0] as NSString
var dataFilePath = docsDir.stringByAppendingPathComponent("data.archive")
NSKeyedArchiver.archiveRootObject(data, toFile: dataFilePath)
}
然后,当您希望取消归档时,请使用此
func loadCustomData() -> NSMutableArray
{
var filemgr : NSFileManager
var docsDir : String
var dirPaths : NSArray
filemgr = NSFileManager.defaultManager()
dirPaths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true) as NSArray
docsDir = dirPaths[0] as NSString
var dataFilePath = docsDir.stringByAppendingPathComponent("data.archive")
if(filemgr.fileExistsAtPath(dataFilePath))
{
var journeyData = NSKeyedUnarchiver.unarchiveObjectWithFile(dataFilePath) as NSMutableArray
return journeyData
}
else
{
var emptyArray = NSMutableArray()
return NSMutableArray()
}
}
希望如果您有任何疑问,请随时提出帮助