Howto fill UITableView with sections and rows dynamically? - objective-c

Question

I have some problems with UITableView and sections/rows.
Iam parsing the section names, all row names and row count per section from a xml.
I have 3 NSMutableArrays:
nameArray (with all row names)
sectionArray (all section names)
secCountArray (row count per section)
For the cellForRowAtindexPath to work, do I have to return the rows for the displayed section?
The next step I would do is to build an 2d Array with sections and all rows for each section.
Does anyone knows any better solution?
Here comes the code:
// 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] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
}
// Set up the cell
int xmlEntryIndex = [indexPath indexAtPosition: [indexPath length] -1];
//???
cell.textLabel.text = [[theParser.nameArray objectAtIndex: 1]valueForKey:#"name"];
return cell;
}
Thanks!

Answer 1

You could have one _section array and one _row array for the whole tableview.
like your view controller.h file declare array
NSMutableArray *arrSection, *arrRow;
then your view controller.m file paste below code..
- (void)viewDidLoad
{
[super viewDidLoad];
arrSection = [[NSMutableArray alloc] initWithObjects:#"section1", #"section2", #"section3", #"section4", nil];
arrRow = [[NSMutableArray alloc] init];
[arrSection enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
NSMutableArray *tempSection = [[NSMutableArray alloc] init];
[arrSection enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
[tempSection addObject:[NSString stringWithFormat:#"row%d", idx]];
}];
[arrRow addObject:tempSection];
}];
NSLog(#"arrRow:%#", arrRow);
}
#pragma mark - Table view data source
-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return [arrSection count];
}
-(NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
return [arrSection objectAtIndex:section];
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [[arrRow objectAtIndex:section] count];
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell* cell = [tableView dequeueReusableCellWithIdentifier:nil];
if(!cell)
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:nil];
cell.textLabel.text = [[arrRow objectAtIndex:[indexPath section]] objectAtIndex:[indexPath row]];
return cell;
}
This method does not involve defining and creating your own custom view. In iOS 6 and up, you can easily change the background color and the text color by defining the
- (void)tableView:(UITableView *)tableView
willDisplayHeaderView:(UIView *)view
forSection:(NSInteger)section
delegate method.
For example:
- (void)tableView:(UITableView *)tableView willDisplayHeaderView:(UIView *)view forSection:(NSInteger)section
{
// Background color
view.tintColor = [UIColor blackColor];
// Text Color
UITableViewHeaderFooterView *header = (UITableViewHeaderFooterView *)view;
[header.textLabel setTextColor:[UIColor whiteColor]];
// Another way to set the background color
// Note: does not preserve gradient effect of original header
// header.contentView.backgroundColor = [UIColor blackColor];
}
you can see display dynamic section and row
May be helpful for you..

Answer 2

You could have one array for the whole table view. The array contains arrays for every section. Then the cellForRowAtIndexPath could look like:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
}
[[cell textLabel] setText: [[[myArray objectAtIndex: indexPath.section] objectAtIndex: indexPath.row]];
return cell;
}
I hope this help you in your problem.
Edit: With the modern Objective-C and ARC I would write this as
- (void)viewDidLoad {
....
[self.tableView registerClass:[MyCellClass class] forCellReuseIdentifier:kMyCellIdentifier];
}
...
- (UITableViewCell*)tableView:(UITableView*)tableView cellForRowAtIndexPath:(NSIndexPath*)indexPath {
MyCellClass *cell = [tableView dequeueReusableCellWithIdentifier:kMyCellIdentifier forIndexPath:indexPath];
cell.textLabel.text = myArray[indexPath.section][indexPath.row];
return cell;
}