how do we access values stored in NSMutableArray of NSMutableDictionary? - iphone

Question

I have stored values in NsMutableDictionaries . ThenI stored all the dictionaries in NSMutable Array. I need to access the values ? How can I do that ?
-(void)viewDidLoad
{
[super viewDidLoad];
self.title = #"Library";
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:#"Close" style:UIBarButtonItemStyleBordered target:self action:#selector(close:)];
cells = [[NSMutableArray alloc] initWithObjects:#"dict1", #"dict2", #"dict3", #"dict4", #"dict5", #"dict6", nil];
dict1 = [[NSMutableDictionary alloc] initWithObjectsAndKeys:#"Mon, 01 Feb #2", #"date", #"0.7", #"time", #"1.2MB", #"size", #"200*200", #"pix", nil];
dict2 = [[NSMutableDictionary alloc] initWithObjectsAndKeys:#"Wed, 02 Mar #3", #"date", #"1.2", #"time", #"2.2MB", #"size", #"300*300", #"pix", nil];
dict3 = [[NSMutableDictionary alloc] initWithObjectsAndKeys:#"Tue, 03 Apr #5", #"date", #"1.7", #"time", #"2.5MB", #"size", #"240*240", #"pix", nil];
dict4 = [[NSMutableDictionary alloc] initWithObjectsAndKeys:#"Mon, 01 Feb #2", #"date", #"0.7", #"time", #"1.2MB", #"size", #"200*200", #"pix", nil];
dict5 = [[NSMutableDictionary alloc] initWithObjectsAndKeys:#"Mon, 10 Nov #5", #"date", #"2.7", #"time", #"4.2MB", #"size", #"200*400", #"pix", nil];
dict6 = [[NSMutableDictionary alloc] initWithObjectsAndKeys:#"Mon, 11 Dec #6", #"date", #"4.7", #"time", #"2.2MB", #"size", #"500*200", #"pix", nil];
//[cells addObject:dict1];
//[cells addObject:dict2];
//[cells addObject:dict3];
//[cells addObject:dict4];
//[cells addObject:dict5];
//[cells addObject:dict6];
}
// Customize the number of rows in the table view.
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [cells count];
}
// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil)
{ cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease];
//cell.contentView.frame = CGRectMake(0.0f, 0.0f, 320.0f, 80.0f);
[cell setAccessoryType:UITableViewCellAccessoryDisclosureIndicator];
UIImageView *image1 = [[UIImageView alloc]init];
image1.frame = CGRectMake(0.0f, 0.0f, 80.0f, 80.0f);
image1.tag = tag7;
UILabel *dateLabel = [[UILabel alloc]init];
dateLabel.frame = CGRectMake(100.0f, 5.0f, 120.0f, 25.0f);
dateLabel.font = [UIFont fontWithName:#"Georgia" size:10];
dateLabel.tag = tag1;
UILabel *timeLabel = [[UILabel alloc] init];
timeLabel.frame = CGRectMake(100.0f, 30.0f, 40.0f, 25.0f);
timeLabel.font = [UIFont fontWithName:#"Georgia" size:10];
timeLabel.tag = tag2;
UILabel *sizeLabel = [[UILabel alloc] init];
sizeLabel.frame = CGRectMake(160.0f, 30.0f, 40.0f, 25.0f);
sizeLabel.font = [UIFont fontWithName:#"Georgia" size:10];
sizeLabel.tag = tag3;
UILabel *pixLabel = [[UILabel alloc] init];
pixLabel.frame = CGRectMake(220.0f, 30.0f, 40.0f, 25.0f);
pixLabel.font = [UIFont fontWithName:#"Georgia" size:10];
pixLabel.tag = tag4;
UILabel *shareLabel = [[UILabel alloc] init];
shareLabel.frame = CGRectMake(100.0f, 55.0f, 100.0f, 25.0f);
shareLabel.font = [UIFont fontWithName:#"Georgia" size:10];
shareLabel.tag = tag5;
UILabel *deleteLabel = [[UILabel alloc] init];
deleteLabel.frame = CGRectMake(220.0f, 55.0f, 100.0f, 25.0f);
deleteLabel.font = [UIFont fontWithName:#"Georgia" size:10];
deleteLabel.tag = tag6;
[cell.contentView addSubview:dateLabel];
[cell.contentView addSubview:timeLabel];
[cell.contentView addSubview:sizeLabel];
[cell.contentView addSubview:pixLabel];
[cell.contentView addSubview:shareLabel];
[cell.contentView addSubview:deleteLabel];
[cell.contentView addSubview:image1];
[dateLabel release];
[timeLabel release];
[sizeLabel release];
[pixLabel release];
[shareLabel release];
[deleteLabel release];
[image1 release];
}
// Set up the cell...
[(UILabel *)[cell viewWithTag:tag1] setText:[cells objectAtIndex:[dict1 objectForKey: #"date"]]];
[(UILabel *)[cell viewWithTag:tag2] setText:[cells objectAtIndex:[dict1 objectForKey: #"time"]]];
[(UILabel *)[cell viewWithTag:tag3] setText:[cells objectAtIndex:[dict1 objectForKey: #"size"]]];
[(UILabel *)[cell viewWithTag:tag4] setText:[cells objectAtIndex:[dict1 objectForKey: #"pix"]]];
[(UILabel *)[cell viewWithTag:tag5] setText:#"Share"];
[(UILabel *)[cell viewWithTag:tag6] setText:#"Delete"];
cell.imageView.image = [UIImage imageNamed:#"image2.png"];
return cell;
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return 80.0f;
}
I did in above way but it is not working. I know the mistake is at the accessing values. but, I could not get how to do it ?
Thank You.

Answer 1

You haven't stored the dictionaries at all—just the strings "dict1", "dict2", "dict3", and so on. The array initializer you're using should be something like
cells = [[NSMutableArray alloc] initWithCapacity:6];
I'm not sure why you've got all of the [cells addObject:dictionaryN]; lines commented out, because that's the correct way to add the dictionaries to the array; you also need to have a [dictionaryN release]; after each of them to prevent memory leaks.
To get the values out of the dictionaries in the array, you need to do something like this in your -tableView:cellForRowAtIndexPath: method:
NSDictionary *rowDictionary = [cells objectAtIndex:indexPath.row];
[(UILabel *)[cell viewWithTag:tag1] setText:[rowDictionary objectForKey:#"date"]];
[(UILabel *)[cell viewWithTag:tag2] setText:[rowDictionary objectForKey:#"time"]];
// etc.