iOS- Error in displaying the array values in a table - ios

Question

In my app, I have created a mutable array named "array".
array=[[NSMutableArray alloc]initWithObjects:#"a",#"b",#"c",#"d",#"e", nil];
My tableView contains only one row for multiple section, Each section has a customView which contains only one label.
My custom View name is ContentOfCell
ContentOfCell * contentOfCell=[[ContentOfCell alloc]initWithFrame:CGRectMake(0, 0, 100, 50)];
[cell.contentView addSubview:contentOfCell];
I have added the array to the label
contentOfCell.label.text=[array objectAtIndex:indexPath.section];
My problem is that it recognises only the first 4 values in the array and the first 4 values is getting repeated in the sections
I thing something is going wrong here
-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return [indexPath row]+50;
}
If I change 50 by 100, the error occurs if not the values are inserted correctly
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSString * cellIdentifier=[NSString stringWithFormat:#"MyTableView"];
cell=[myTableView dequeueReusableCellWithIdentifier:cellIdentifier];
if(cell== nil)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
ContentOfCell * contentOfCell=[[ContentOfCell alloc]initWithFrame:CGRectMake(0, 0, 100, 50)];
[cell.contentView addSubview:contentOfCell];
contentOfCell.nameField.text=[arr objectAtIndex:indexPath.section];
cell.contentView.backgroundColor=[UIColor whiteColor];
}}
Here the view contains only 3 rows, when I scroll down the array is initiated again, then the values are printed again

Answer 1

I guess you are not reusing the cell correctly.
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSString * cellIdentifier=[NSString stringWithFormat:#"MyTableView"];
cell=[myTableView dequeueReusableCellWithIdentifier:cellIdentifier];
ContentOfCell *contentOfCell;
//Initialization Part. declare objects here
if(cell== nil)
{
//Creation part. Create your new cell here. Do all UI actions here
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
contentOfCell=[[ContentOfCell alloc]initWithFrame:CGRectMake(0, 0, 100, 50)];
contentOfCell.tag =100;
[cell.contentView addSubview:contentOfCell];
cell.contentView.backgroundColor=[UIColor whiteColor];
}
else{
// Reusable part. Reuse the UI controls here from existing cell
contentOfCell = (ContentOfCell *)[cell.contentView viewWithTag:100];
}
//Assign all the data here
contentOfCell.nameField.text=[arr objectAtIndex:indexPath.section];
}
This is one of the simple mistake often committed by iOS Rookies.
Kindly check the Apple developer documentation here to understand how a tableview cell is reused
https://developer.apple.com/library/ios/documentation/userexperience/conceptual/tableview_iphone/TableViewCells/TableViewCells.html

Answer 2

I implemented same code as below with grouped table.Everything is fine.Please compare your code with below code.
- (void)viewDidLoad
{
[super viewDidLoad];
arrData=[[NSMutableArray alloc] initWithObjects:#"a",#"b",#"c",#"d",#"e",#"f",#"g",#"h",#"i",#"j",#"k", nil];
// Do any additional setup after loading the view, typically from a nib.
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [arrData count];
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath;
{
return 50.0;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *aCell=[tableView dequeueReusableCellWithIdentifier:#"da"];
if(aCell==Nil)
{
aCell=[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:#"da"];
ContentOfCell *ContentOfCellObj=[[ContentOfCell alloc] initWithFrame:CGRectMake(0,0,320,50)];
ContentOfCellObj.tag=101;
[aCell.contentView addSubview:ContentOfCellObj];
}
ContentOfCell *ContentOfCellObj=(ContentOfCell*)[aCell.contentView viewWithTag:101];
ContentOfCellObj.nameField.text=[NSString stringWithFormat:#"%#",[arrData objectAtIndex:indexPath.section]];
return aCell;
}

Answer 3

Use this:
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString * cellIdentifier=#"CellIdentifier";//or your custom name
UITableViewCell* cell=[tableView dequeueReusableCellWithIdentifier:cellIdentifier];
if(cell== nil)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
ContentOfCell * contentOfCell=[[ContentOfCell alloc]initWithFrame:CGRectMake(0, 0, 100, 50)];
contentOfCell.tag = 101;
[cell.contentView addSubview:contentOfCell];
cell.contentView.backgroundColor=[UIColor whiteColor];
}
ContentOfCell * contentOfCell = (ContentOfCell*)[cell.contentView viewWithTag:101];
contentOfCell.nameField.text=[arr objectAtIndex:indexPath.section];
return cell;
}

Answer 4

Make sure you set
myTableView.dataSource = self;
and these two delegate methods
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return [arrData count];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return 1;
}

Answer 5

Try this code, surely it will resolve your problem.
Step 1. First declare array as global variable
#interface YOUR-CLASS-NAME ()
{
NSMutableArray *array
}
Step 2. Now set no of sections you need. This means how many time do you want to repeat the array values in table continuously.
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
Step 3. Now set no of rows you need to display from your array. This means no of values from your array need to display
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [array count];
}