如何实现unarchiver代理覆盖类名？ [英] How to implement the unarchiver delegate for overwriting the classname?

问题描述

我的IOS应用程序有2个目标：MYAPPTARGET_1& MYAPPTARGET_2

MYAPPTARGET_1正在使用NSKeyedArchiver将流写入BLOB

MYAPPTARGET_2正在使用NSKeyedUnarchiver

$ b $从BLOB中读取流b

在MYAPPTARGET_2中从BLOB取消归档流程时，我收到错误：
016-01-18 15：01：38.541 WorldHistoryAtlasTest [598： 9405] *由于未捕获异常终止应用程序NSInvalidUnarchiveOperationException，
reason：'* - [NSKeyedUnarchiver decodeObjectForKey：]：无法解码类
（MYAPPTARGET_1.MapTheme）的对象键（rootobject）;

所以看起来好像是用MYAPPTARGET_1的前缀编码，并且从MYAPPTARGET_2可以读取。

所以我得到了一个提示，在另一个STACKOVERFLOW答案中克服这一点，使用委托unarchiver覆盖Classname。但是我无法实现这一点：

  func unarchiver（unarchiver：NSKeyedUnarchiver，cannotDecodeObjectOfClassName name：String，originalClasses classNames：[String ]） - > AnyClass？ {
 print（ClassName is+ name）; 
 return nil; //做什么，覆盖类别名称。 
} 
 
 var mykeyedunarchiver：NSKeyedUnarchiver = NSKeyedUnarchiver（forReadingWithData：data！）; 
 mykeyedunarchiver.delegate = self; 
 let temp = mykeyedunarchiver.decodeObjectForKey（rootobject）
  

我有一个带有目标名称的应用MYAPPTARGET_1和我使用NSKeyedArchiver功能将一些数据存储为blob。

然后，再有一个名为MYAPPTARGET_2的第二个Apps-Target，我尝试再次读取数据。从DB中存储的BLOB加载。

如果有人可以给我一个实际的提示，我会很高兴。

解决方案

以下是足够的：

  class MyObject：NSObject，NSCoding {...} 
 let my = MyObject（）
 
 // archive 
 NSKeyedArchiver.setClassName（MyObject，for： MyObject.self）
 let data = NSKeyedArchiver.archivedData（withRootObject：r）
 
 // unarchive 
 NSKeyedUnarchiver.setClass（MyObject.self，forClassName：MyObject）
 let _ = NSKeyedUnarchiver.unarchiveObject（with：data）
  

这有助于我在一个mac应用程序和一个iphone应用程序

• I have 2 Targets of my IOS-App : MYAPPTARGET_1 & MYAPPTARGET_2
• MYAPPTARGET_1 is writing a Stream to a BLOB using NSKeyedArchiver
• MYAPPTARGET_2 is reading a Stream from a BLOB using NSKeyedUnarchiver

When unarchiving the Stream from the BLOB in my MYAPPTARGET_2, I get the Error: 016-01-18 15:01:38.541 WorldHistoryAtlasTest[598:9405] * Terminating app due to uncaught exception 'NSInvalidUnarchiveOperationException', reason: '* -[NSKeyedUnarchiver decodeObjectForKey:]: cannot decode object of class (MYAPPTARGET_1.MapTheme) for key (rootobject);

So it seemes to be obviously encoded with a prefix of MYAPPTARGET_1 and is not readable from MYAPPTARGET_2.

So I got a hint for overcome this in another STACKOVERFLOW Answer to use a delegate unarchiver to overwrite the Classname. But I am not able to implement this:

func unarchiver(unarchiver: NSKeyedUnarchiver, cannotDecodeObjectOfClassName name: String, originalClasses classNames: [String]) -> AnyClass? {
    print("ClassName is " + name);
    return nil; // WHAT TO DO , TO OVERWRITE THE CLASS NAME.
}

 var mykeyedunarchiver:NSKeyedUnarchiver=NSKeyedUnarchiver(forReadingWithData: data!);
 mykeyedunarchiver.delegate = self;
 let temp=mykeyedunarchiver.decodeObjectForKey("rootobject")

I have an App with targetname MYAPPTARGET_1 and I store some data as blob using the NSKeyedArchiver feature.

Then later with a second Apps-Target named MYAPPTARGET_2 I try to read the data again. Load from the BLOB stored in the DB.

I would be so happy if someone could give me a practical hint on this.

解决方案

the following is enough:

class MyObject: NSObject, NSCoding {...}
let my = MyObject()

// archive
NSKeyedArchiver.setClassName("MyObject", for: MyObject.self)
let data = NSKeyedArchiver.archivedData(withRootObject: r)

// unarchive
NSKeyedUnarchiver.setClass(MyObject.self, forClassName: "MyObject")
let _ = NSKeyedUnarchiver.unarchiveObject(with: data)

this helped me to exchange custom objects between a mac-app and an iphone app

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