Question

Possible Duplicate:
NSMutableArray Not showing actual values when NSLog in iphone application

I have NSMutableArray initialised as follows:

- (id)init
{
self = [super init];
if (self)
{
    mySpotsArray = [[NSMutableArray alloc]init];
}

return self;
}

The array stores data of NSTable as follows:

//-----------------------------------------
- (NSInteger)numberOfRowsInTableView:(NSTableView *)tableView {
return [mySpotsArray count];

[self saveMySpots];
}


//-----------------------------------------
- (id)tableView:(NSTableView *)tableView objectValueForTableColumn:(NSTableColumn            *)tableColumn row:(NSInteger)row
{
Spot *sp = [mySpotsArray objectAtIndex:row];
NSString *identifier = [tableColumn identifier];
return [sp valueForKey:identifier];

[self saveMySpots];
}



 //-----------------------------------------
 - (void)tableView:(NSTableView *)tableView setObjectValue:(id)object forTableColumn:(NSTableColumn *)tableColumn row:(NSInteger)row
{
Spot *sp = [mySpotsArray objectAtIndex:row];
NSString *identifier = [tableColumn identifier];
[sp setValue:object forKey:identifier];

[self saveMySpots];
}

I am adding and deleting objects like this:

//-----------------------------------------
- (IBAction)addSpot:(id)sender
{
[mySpotsArray addObject:[[Spot alloc]init]];
[mySpotsTable reloadData];

[self saveMySpots];
}




//-----------------------------------------
- (IBAction)deleteSpot:(id)sender
{
NSInteger row = [mySpotsTable selectedRow];
[mySpotsTable abortEditing];
if (row !=-1)
{
    [mySpotsArray removeObjectAtIndex: row];
}

[mySpotsTable reloadData];

[self saveMySpots];
}

I am saving and loading array content like this:

//-----------------------------------------
- (void) saveMySpots
{
savedSpots = [NSUserDefaults standardUserDefaults];
encodedMySpotsArrayObject = [NSKeyedArchiver archivedDataWithRootObject: mySpotsArray];
[savedSpots setObject: encodedMySpotsArrayObject forKey:[NSString stringWithFormat:@"MySpotsArrayKey"]];
}




//-----------------------------------------
- (void) loadMySpots
{
savedSpots = [NSUserDefaults standardUserDefaults];
decodedMySpotsArrayObject = [savedSpots objectForKey: [NSString stringWithFormat:@"MySpotsArrayKey"]];

 mySpotsArray = [NSKeyedUnarchiver unarchiveObjectWithData: decodedMySpotsArrayObject];
}

Objects are encoded and decoded like this:

//-----------------------------------------
- (id)init
{
self = [super init];
if (self)
{
    _mySpot = @"My Spot";
    _localOffset = 0;
}

return self;
}


//-----------------------------------------
- (void)encodeWithCoder:(NSCoder *)encoder
{
[encoder encodeObject: self.mySpot forKey:@"MySpotKey"];
[encoder encodeInt: self.localOffset forKey:@"LocalOffsetKey"];
}



//-----------------------------------------
- (id)initWithCoder:(NSCoder *)decoder
{
self = [super init];
if( self != nil )
{
    self.mySpot = [decoder decodeObjectForKey:@"MySpotKey"];
    self.localOffset = [decoder decodeIntForKey:@"LocalOffsetKey"];
}
return self;
}

Everything is properly defined in their respective .h like this

NSMutableArray *mySpotsArray;

NSUserDefaults *savedSpots;

NSData *encodedMySpotsArrayObject;
NSData *decodedMySpotsArrayObject;

All works perfect on UI level, i.e. the table is properly displayed, added, deleted, saved and loaded. But when I am trying to NSLog like this:

NSLog(@"%@", mySpotsArray);

I get this:

2012-09-19 13:41:25.372 Spot[1541:303] (
"<Spot: 0x100674ab0>",
"<Spot: 0x100674c20>",
"<Spot: 0x100675040>"
)

I’ve also tried this:

 NSString *strData = [[NSString alloc]initWithData: decodedMySpotsArrayObject encoding:NSUTF8StringEncoding];

NSLog(@"strData: %@", strData);

and I get this:

2012-09-19 13:41:25.371 Spot[1541:303] strData: (null)

I simply need to access NSMutableArray content and then convert it to strings. The actual content what I see on UI is a table with 2 columns and 3 rows:

Yerevan 2
London -1
Los Angeles -9

What am I doing wrong?

Thanks

Answer 1

Add this method in your Spot class

- (NSString *)description
{
   NSString *str = [[NSString alloc] initWithFormat:@"%@ \n %@ \n%@",Var1,Var2,var3];

   return str;
}

replace Var1, Var2 and Var3 with your original variable name.