Store Custom Objects in NSUserDefaults

Question

I am trying to store a custom objects as follows, but I am getting an error.

// store data
NSMutableArray *archiveArray = [NSMutableArray arrayWithCapacity:pOrderElements.count];
for (id orderObject in pOrderElements) {
    NSData *personEncodedObject = [NSKeyedArchiver archivedDataWithRootObject:orderObject];
    [archiveArray addObject:personEncodedObject];
}

NSUserDefaults *userData = [NSUserDefaults standardUserDefaults];
[userData setObject:archiveArray forKey:@"personDataArray"];


// retrive data
NSData *data = [userData objectForKey:@"personDataArray"];
// the following line throws an error
id retrieveData = [NSKeyedUnarchiver unarchiveObjectWithData:data];

here is my pOrderElements

(lldb) po pOrderElements
<__NSArrayM 0x174256b90>(
{
    category = 1;
    imagePath = "products/chicken-kabob.png";
    name = "Baked Chicken";
    price = "5.49";
}
)

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFArray bytes]: unrecognized selector sent to instance 0x174264f40'

Possible duplicate of [How to store custom objects in NSUserDefaults](http://stackoverflow.com/questions/2315948/how-to-store-custom-objects-in-nsuserdefaults) — Bista, Apr 05 '17 at 05:41
I referred to following answer, but I got the error http://stackoverflow.com/questions/19720611/attempt-to-set-a-non-property-list-object-as-an-nsuserdefaults — casillas, Apr 05 '17 at 05:45
[don't post same questions again](http://stackoverflow.com/questions/43222415/store-nsmutablearray-into-nsuserdefaults) — Fahim Parkar, Apr 05 '17 at 06:26
It is duplicate question but I have posted complete answer according to your need.Please check it and let me know @hotspring — Vinod Kumar, Apr 05 '17 at 06:40
retrieve = NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults]; NSArray *arrayOfImages = [userDefaults objectForKey:@"personDataArray"]; — Dishant Rajput, Apr 05 '17 at 07:30

score 3 · Accepted Answer · answered Apr 05 '17 at 05:55

You unarchive incorrect object. You store NSArray to NSUserDefaults

NSArray * archiveArray = [userData objectForKey:@"personDataArray"];
for (NSData *personEncodedObject in archiveArray) {
    id personObject = [NSKeyedUnarchiver unarchiveObjectWithData:personEncodedObject];
}

Vinod Kumar · Answer 2 · 2017-04-05T06:37:34.293

First you create custom class Like below.

CustomObject.h

#import <Foundation/Foundation.h>

@interface CustomObject : NSObject

@property(strong,nonatomic)NSString *name;

@end

CustomObject.m

#import "CustomObject.h"

@implementation CustomObject



- (void)encodeWithCoder:(NSCoder *)encoder {
    //Encode properties, other class variables, etc
    [encoder encodeObject:self.name forKey:@"name"];

}

- (id)initWithCoder:(NSCoder *)decoder {
    if((self = [super init])) {
        //decode properties, other class vars
        self.name = [decoder decodeObjectForKey:@"name"];

    }
    return self;
}

Then create CustomObject class object and store in NSUserDefaults

Stored your object like this

CustomObject *object =[CustomObject new];
object.name = @"test";

NSMutableArray *arr = [[NSMutableArray alloc]init];
[arr  addObject:object];

NSData *encodedObject = [NSKeyedArchiver archivedDataWithRootObject:arr];
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:encodedObject forKey:@"storeObject"];
[defaults synchronize];

get custom object from NSUserDefaults like this

NSData *storedEncodedObject = [defaults objectForKey:@"storeObject"];
    NSArray *arrStoreObject = [NSKeyedUnarchiver unarchiveObjectWithData:storedEncodedObject];
    for (int i=0; i<arrStoreObject.count; i++)
    {
        CustomObject *storedObject = [arrStoreObject objectAtIndex:i];
        NSLog(@"%@",storedObject.name);

    }

Store Custom Objects in NSUserDefaults

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