NSCoding.

@interface MyObject : NSObject <NSCoding>

@property (strong, nonatomic) NSString *firstValue;
@property (strong, nonatomic) NSString *secondValue;

@end

Your implementation must include encodeWithCoder and initWithCoder

- (void)encodeWithCoder:(NSCoder*)encoder {
    [encoder encodeObject:self.firstValue forKey:@"first_value"];
    [encoder encodeObject:self.secondValue forKey:@"second_value"];
}

- (id)initWithCoder:(NSCoder*)decoder {
    self = [MyObject new];
    self.firstValue = [decoder decodeObjectForKey:@"first_value"];
    self.secondValue = [decoder decodeObjectForKey:@"second_value"];
    return self;
}

You can then store MyObject in NSUserDefaults like this.

MyObject *myObj = [MyObject new];

myObj.firstValue = @"This is the first value";
myObj.secondValue = @"This is another value";

NSData *data = [NSKeyedArchiver archivedDataWithRootObject:myObj];
[[NSUserDefaults standardUserDefaults] setObject:data forKey:@"my_object"];
[[NSUserDefaults standardUserDefaults] synchronize];
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