AbhiRam AbhiRam - 6 months ago 22
iOS Question

How to Save and Retrieve NSObject class using NSUserDafaults in Ios

Hi i want to Save and Retrieve NSObject class using NSUserDefaults for that i wrote below code but i am getting exception like below

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Attempt to insert non-property list object for key DATA'

For Saving:-

SavingBean*savingbean = [[SavingBean alloc]init];
[savingbean savingData:userName.text :passWord.text];

NSUserDefaults * defaults = [[NSUserDefaults alloc]init];
[defaults setObject:savingbean forKey:@"DATA"];

For Retrieving:-

defaults = [[NSUserDefaults alloc]init];
savingbean = [defaults objectForKey:@"DATA"];

NSLog(@"Username is===>%@",savingbean.userName);
NSLog(@"Password is===>%@",savingbean.passWord);


.h file:-

#import <Foundation/Foundation.h>

@interface SavingBean : NSObject{

NSString *userName;
NSString *passWord;

@property(nonatomic, retain) NSString *userName;
@property(nonatomic, retain) NSString *passWord;

-(void)savingData :(NSString*)userName :(NSString*)password;


.m file:-

#import "SavingBean.h"

@implementation SavingBean
@synthesize userName,passWord;

-(void)savingData :(NSString*)username :(NSString*)password{

userName = username;
passWord = password;



You can set object like this:

NSUserDefaults *currentDefaults = [NSUserDefaults standardUserDefaults];
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:savingbean];
[currentDefaults setObject:data forKey:@"DATA"];
[currentDefaults synchronize];

and for get object like this:

NSData *data = [currentDefaults objectForKey:@"DATA"];
SavingBean *token = [NSKeyedUnarchiver unarchiveObjectWithData:data];

For Custom class you have to edit this methods in you bean class:

- (void)encodeWithCoder:(NSCoder *)encoder
    [encoder encodeObject:self.userName==nil?@"":self.userName forKey: @"userName"];
    [encoder encodeObject:self.passWord==nil?@"":self.passWord forKey: @"passWord"];

-(id)initWithCoder:(NSCoder *)decoder
    self = [super init];
        self.userName = [decoder decodeObjectForKey: @"userName"];
        self.passWord = [decoder decodeObjectForKey: @"passWord"];
    return self;

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You can also use JSON Accelerator to create bean class. This is very simple and powerful tool.