Archive and archive

1. Archiving

Nsarray * array = @ [@ "ARCHIVE", @ "", @ ""];

// 1. Create an archive object

Nsmutabledata * Data = [nsmutabledatadata];

Nskeyedarchiver * archiver = [[nskeyedarchiveralloc] initforwritingwithmutabledata: Data];

// 2. Archive

[Archiver encodeobject: primary key: @ "array"];

// 3. the archive is terminated. If the archive is terminated, the archive is invalid.

[Archiver finishencoding];

[Array release];

[Archiver release];

// 4. Obtain the path of the written file. No file is automatically created.
Nsstring * documentpath =
[Nssearchpathfordirectoriesindomains (nsdocumentdirectory, nsuserdomainmask, yes) firstobject];
Nsstring * newfiel = [documentpathstringbyappendingpathcomponent: @ "bb.txt"];

// 5. Write Data to the file

Bool issucceed = [datawritetofile: [selfgetfiel] atomically: Yes];

Ii. Archive operations

// 1. initialize nsmutabledata Based on the file path

Nsmutabledata * Data = [nsmutabledatadatawithcontentsoffile:/users/lanouhn/library/Application Support/iPhone simulator/7.1/applications/300befd5-1f93-47a3-a1b3-936195faa53f];

// 2. Create an archive class

Nskeyedunarchiver * unarchiver = [[nskeyedunarchiveralloc] initforreadingwithdata: Data];

// 3. Archive

Nsarray * array = [unarchiverdecodeobjectforkey: @ "array"];

// 4. End the archive

[Unarchiver finishdecoding];

[Unarchiver release];

3. Note

1. If you want to archive a class object, you must enable the class to implement the nscoding protocol.

2. When the object is a string, array, Dictionary, or set, the semantic attribute of the attribute is declared as copy.

3. When assigning values to instance variables after defining attributes, use the setter method.

Example
@ Interface person: nsobject <nscoding]>
@ Property (nonatomic, copy) nsstring * Name

Archive and archive