Archive anti-archive-local sandbox store complex objects

Simple objects such as nsstring,nsnumber,nsarray,nsdictionary can be conveniently stored in local sandbox files, and complex objects, such as properties and methods, require the use of archive anti-archiving methods (serialization and deserialization). stored in a nsdata manner.

Archive anti-archiving, the main sequence of operations is: encoding (enCoding), archive (archiver), decode (decoding), Reverse archive (unarchiver)

1. Encoding and decoding methods, you need to accept the <NSCoding> protocol in the class declaration file, in the implementation file. m to complete the protocol method:

1 /*2 * Model.h accepts nscoding agreement3  */4 5 #import<Foundation/Foundation.h>6 #import<UIKit/UIKit.h>7 8 @interfaceModel:nsobject<nscoding>9@property (nonatomic,strong) NSString *name;Ten @property (nonatomic,assign) Nsinteger num; One  A-(Instancetype) Initwithname: (NSString *) name Num: (nsinteger) num; - @end

1 /*2 * MODEL.M implementation of encoding and decoding protocol method3  */4 5 #import "Model.h"6 7 @implementationModel8-(Instancetype) Initwithname: (NSString *) name Num: (nsinteger) num{9Self =[Super init];Ten     if(self) { OneSelf.name =name; ASelf.num =num; -     } -     returnSelf ; the } -  - //Coding -- (void) Encodewithcoder: (Nscoder *) acoder{ +[Acoder encodeObject:self.name Forkey:@"name"]; -[Acoder encodeobject:@ (self.num) Forkey:@"Num"]; + } A  at //decoding --(Instancetype) Initwithcoder: (Nscoder *) adecoder{ -Self =[Super init]; -     if(self) { -Self.name = [Adecoder decodeobjectforkey:@"name"]; -Self.num = [[Adecoder decodeobjectforkey:@"Num"] IntegerValue]; in     } -     returnSelf ; to } +  - @end

2. Archive-Save complex objects; Reverse Archive-Get objects

1 #import "ViewController.h"2 #import "Model.h"3 4 @interfaceViewcontroller ()5@property (Weak, nonatomic) Iboutlet Uiimageview *image;6@property (Weak, nonatomic) Iboutlet Uitextfield *Nametext;7@property (nonatomic,strong) NSString *path;8 @end9 Ten @implementationViewcontroller One  A- (void) Viewdidload { - [Super Viewdidload]; -      the     //Get sandbox path -Self.path = [Nssearchpathfordirectoriesindomains (nsdocumentdirectory, Nsuserdomainmask, YES) [0] stringByAppendingPathComponent:@"Data.data"]; - } -  + //Archive Save Object --(Ibaction) Save: (UIButton *) Sender { +     //Creating Objects AModel *m = [[Model alloc] Initwithname:@"Test"Num:101]; at      -     //Create nsdata (variable), Nskeyedarchiver (the object that implements the archive) -Nsmutabledata *data =[Nsmutabledata data]; -Nskeyedarchiver *archiver =[[Nskeyedarchiver alloc] initforwritingwithmutabledata:data]; -      -     //object for encoding archiving in[Archiver encodeobject:m Forkey:@"m"]; -      to     //Archive Complete (required) + [Archiver finishencoding]; -      the     //write to the sandbox path file * [Data WriteToFile:self.path atomically:yes]; $ }Panax Notoginseng  - //Anti-archive decoding get objects the-(Ibaction)Get:(UIButton *) Sender { +     //Create nsdata (variable), Nskeyedunarchiver (object to implement anti-archive) ANsmutabledata *data =[Nsmutabledata DataWithContentsOfFile:self.path]; theNskeyedunarchiver *unarchiver =[[Nskeyedunarchiver alloc] initforreadingwithdata:data]; +      -     //Anti-archive decoding get objects $Model *m = [Unarchiver decodeobjectforkey:@"m"]; $      -Self.nameText.text = [NSString stringWithFormat:@"%@%ld", M.name, M.num]; - } the  -- (void) didreceivememorywarning {Wuyi [Super didreceivememorywarning]; the     //Dispose of any resources the can be recreated. - } Wu  - @end

*. Main sandbox path:

Nshomedirectory-----------------------> Sandbox master path nsdocumentdirectory-------------------> Documents folder nslibrarydirectory-------------------->library folder Nscachesdirectory---------------------> Caches folder Nstemporarydirectory------------------>tmp folder

Archive anti-archive-local sandbox store complex objects