Populate UITableView with NSMutableArray saved with NSUserDefault - ios

Question

In my application I have an UITextView, which is populated at runtime when I insert new data via an Alert Controller. To print this use data:
NSArray * textfields = alertController.textFields;
            
UITextField * urlfield = textfields [0];
UITextField * titlefield = textfields [1];
UITextField * categoryfield = textfields [2];
            
FeedInfo * newFeed = [[FeedInfo alloc] init];
NewFeed.feedURL = urlfield.text;
NewFeed.feedTitle = titlefield.text;
NewFeed.feedCategory = categoryfield.text;
            
[Self.feedArray addObject: newFeed];
[Self.tableView reloadData];
Where feedArray is a defined class model:
#interface FeedInfo : NSObject
#property (nonatomic,strong) NSString *feedURL;
#property (nonatomic,strong) NSString *feedTitle;
#property (nonatomic,strong) NSString *feedCategory;
#end
Next, I print the data from feedArray inside the IUTableView with:
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"cell" forIndexPath:indexPath];
FeedInfo *feedToShow = [self.feedArray objectAtIndex:indexPath.row];
cell.textLabel.text = feedToShow.feedTitle;
cell.detailTextLabel.text = feedToShow.feedCategory;
return cell;
OK. Up to here everything works fine.
Now the problem is that before I quit the application, I want to save all the cells in the UITableView, because when the re-opening must still have all the inserted data.
I was thinking of saving all the feedArra array (1st class of this topic) by inserting this piece of code after [self.feedArray addObject: newFeed]; and before [self.tableView reloadData];
NSUserDefaults * userDefaults = [NSUserDefaults standardUserDefaults
[UserDefaults setObject: self.feedArray forKey: #"feedArray"];
[userDefaults synchronize];
Within the viewDidLoad method instead:
NSUserDefaults * userDefaults = [NSUserDefaults standardUserDefaults];
Array = [userDefaults objectForKey: # "feedArray"];
And in cellForRowAtIndexPath:
FeedInfo *feedToShow = [array objectAtIndex:indexPath.row];
cell.textLabel.text = feedToShow.feedTitle;
cell.detailTextLabel.text = feedToShow.feedCategory;
But it throws an Exception:
RSSReader[47834:2470261] [User Defaults] Attempt to set a
non-property-list object ("<FeedInfo: 0x600000235200>" ) as an NSUserDefaults/CFPreferences value for key feedArray 2017-07-18 11:00:13.652
RSSReader[47834:2470261] *** Terminating app due to uncaught exception
'NSInvalidArgumentException', reason: 'Attempt to insert non-property
list object (
"<FeedInfo: 0x600000235200>" ) for key feedArray'

Answer 1

You model (Feed) should confirm to NSCoding protocol to Archive and UnArchive the data.
FeedInfo.h
#interface FeedInfo : NSObject <NSCoding>
#property (nonatomic,strong) NSString *feedURL;
#property (nonatomic,strong) NSString *feedTitle;
#property (nonatomic,strong) NSString *feedCategory;
#end
FeedInfo.m
#implementation FeedInfo
- (instancetype)initWithCoder:(NSCoder *)aDecoder {
self = [super init];
if (!self) {
return nil;
}
self.feedURL = [aDecoder decodeObjectForKey:#"feed_url"];
self.feedTitle = [aDecoder decodeObjectForKey:#"feed_title"];
self.feedCategory = [aDecoder decodeObjectForKey:#"feed_category"];
return self;
}
- (void)encodeWithCoder:(NSCoder *)coder {
[coder encodeObject:_feedURL forKey:#"feed_url"];
[coder encodeObject:_feedTitle forKey:#"feed_title"];
[coder encodeObject:_feedCategory forKey:#"feed_category"];
}
#end
Store to Userdefault
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:self.feedArray];
[[NSUserDefaults standardUserDefaults] setObject:data forKey:#"feedArray"];
Retrive from UserDefault
NSData *data = [[NSUserDefaults standardUserDefaults] objectForKey:#"feedArray"];
NSArray *feedArray = [NSKeyedUnarchiver unarchiveObjectWithData:data];

Answer 2

NSUserDefault support these classes :NSNumber（Integer、Float、Double），NSString，NSDate，NSArray，NSDictionary，BOOL;
FeedInfo is a custom class , and you cannot put it in the NSUserDefault;
You should turn the FeedInfo object to NSData , then add it;
NSData * newData = [NSKeyedArchiver archivedDataWithRootObject:newFeed];
[Self.feedArray addObject: newData];

Answer 3

You can you this code. my code is help you
Save NSMutableArray in NSUserDefaults
- (void)saveList:(NSMutableArray *)arr
{
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:arr];
[[NSUserDefaults standardUserDefaults] setObject:data forKey:ZIPCODE_LIST];
[[NSUserDefaults standardUserDefaults]synchronize];
}
Get NSMutableArray from NSUserDefaults
- (NSMutableArray *)getList
{
NSData *data = [[NSUserDefaults standardUserDefaults] objectForKey:ZIPCODE_LIST];
NSMutableArray *arr = (NSMutableArray *)[NSKeyedUnarchiver unarchiveObjectWithData: data];
return arr;
}