An elementary introduction to object archiving in iOS development

The data persistence provided by IOS is: Sqlitecoredata Property list, Nsuserdefault object archive.

Here's a brief introduction to object archiving in iOS development :

An object archive is an object archive that is saved as a file to disk (also known as serialization, persistence) when it is used to read the file's save path to read the contents of the files (also known as the pickup, deserialization)

Object archived files are confidential on the disk cannot view the contents of the file, and the attribute list is clear text can be viewed)

There are two ways to archive objects: 1. Archive objects in Foundat 2. Custom Object Archiving

1. Simple Object Archiving

Use of two classes: Nskeyeda Richivnskeyedunarchiver

Nsstr*homedirectori=nshomedirectori; Get root directory

Nsstringhomepath=[homedirectoristringbya ppendingpathcomponent:@ "Custom file name, such as Test.archiver"];

NSA rrai*[email protected][@ "abc", @ "123", @12];

Boolflag=[nskeyeda RichivarchiveRootObject:arraitoFile:homePath];

ifflag{

[Email protected] "Archive successful! ";

}

Read the contents of the archive file:

NSA Rrai*arrai=[nskeyedunarchivunarchiveobjectwithfile:homepath];

[Email protected] "%@", Arrai;

This makes it easy to implement archiving and reconciliation of the NSA Rrai object.

But this way of archiving has a drawback, is that a file can only save an object, if there are multiple objects to be saved, it is not a lot of n files, so it is not very suitable for the following this way of archiving.

2. Custom content Archiving

Archive:

Using NSData instances as archived storage data

Add archived content---Use key-value pairs

Complete archiving

Solution Archive:

Read files from disk, generate NSData instances

Based on NSData instances and initial solution archive instances

Archive, access value according to Kei

nsstr*homedirectori=nshomedirectori;//getting the root directory

Nsstringhomepath=[homedirectoristringbya ppendingpathcomponent:@ "Custom file name, such as Test.archiver"];

Nsmutabledata*data=[[nsmutabledataalloc]init];

Nskeyeda Rchiv*archiv=[[nskeyeda Rchivalloc]initforwritingwithmutabledata:data];

[archivencodefloat:50forkey:@ "Age"];

[archivencodeobject:@ "Jack" forkey:@ "name"];

[Archivfinishencoding]; End Add object to data

[Archivrelease];

[Datawritetofile:homepath atomically:yes];//writes data to a file to be saved on disk

Ndata*content=[nsdatadatawithconenteoffile:homepath];

Nskeyedunarchiv*unarchiv=[[nskeyedunarchivalloc]initforreadingwithdata:content];

floatag=[unarchivdecodefloatforkey:@ "Age"];

nsstr*name=[unarchivdecodeobjectforkey:@ "Name"];

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An elementary introduction to object archiving in iOS development