How to show change content of table using paging - ios

Question

I am using paging with uitableview. I have array of 40 objects. In the numberofrowsinasection method, I am returning 10 rows. Its mean total number of pages is four. Within the pagecontrol method, I am implementing the paging. When I like
-(ibaction) pagecontrol:
{
if (pagecontrol.currentpage == 0)
{
for (int i=0; i<10; i++ )
{
cell.textlabel.text = [objectarray objectatindex:i];
}
}
if (pagecontrol.currentpage == 1)
{
for (int i=10; i<19; i++ )
{
cell.textlabel.text = [objectarray objectatindex:i];
}
}
if (pagecontrol.currentpage == 2)
{
for (int i=20; i<29; i++ )
{
cell.textlabel.text = [objectarray objectatindex:i];
}
}
if (pagecontrol.currentpage == 3)
{
for (int i=30; i<39; i++ )
{
cell.textlabel.text = [objectarray objectatindex:i];
}
}
}
But I found a strange result in uiableview. Is it correct? Where am I doing the mistake in this pagecontrol method?

Answer 1

Do you always have exactly 40 rows or could there be less?
The code you posted starts with a missing method parameter. There should be either no colon or a parameter after the colon (with a data type).
The code you posted suffers from several problems. The biggest issue is you set the text of the same cell 10 times. You need to set the text of 10 cells, one time each.
Regardless of that, you are going about this all wrong. Replace your posted method with this:
-(IBAction)pagecontrol:(UIPageControl *)pageControl {
[self.tableView reloadData];
}
Then, in your tableView:cellForRowAtIndexPath: method you should do the following:
- (void)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
UITableView *cell = [tableView dequeueReusableCellWithIdentifier:#"Cell"];
if (!cell) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:#"Cell"];
}
int base = pagecontrol.currentPage * 10;
int index = base + indexPath.row;
NSString *text = objectArray[index];
cell.textLabel.text = text;
return cell;
}
This is in addition to your numberOfSectionsInTableView: and tableView:numberOfRowsInSection: methods.
That's all you need.
BTW - case matters. Don't type everything in lowercase. Type it in properly with the proper case.

Answer 2

You are using a constant row in paging to use the section in tableview. It differentiates the rows in the page,
like this:
Set the number of sections in tableview:
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 4;
}
// Set rows in section
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
switch(section){
case 0:
return 10;
break;
case 1:
return 10;
break;
.....
.....
}
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *FirstLevelCell= #"FirstLevelCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:FirstLevelCell];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:FirstLevelCell] autorelease];
}
switch([indexPath section]){
case 0:
{
//Add your code
}
break;
case 1:
{
//Add your code
}
break;
.........
.........
.........
.........
.........
}
}
//Reload table view
[self.tableView reloadData];