How to insert data from second row in tableview in iphone - iphone

i need your help.I need to insert data dynamically but insertion should be from the second row in the tableview in iphone.How can i do this.


You may want to fetch the data from the array w r t (indexPath.row -1), in case you are populating the table with an array


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
if(indexPath.row==0)
{
//return blank cell;
}
//add cell contents
return cell;
}


- (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];
}
// Configure the cell.
NSIndexPath *path1 = [NSIndexPath indexPathForRow:indexPath.row+1 inSection:indexPath.section];
[self configureCell:cell atIndexPath:path1];
return cell;
}
I do not tested it but it should work, try it out

Related

Table does not enter in number of sections and in number of rows

I am using tableView but it does not enter in number of sections and number of rows in tableView here is the code
here is the code for number of sections and number of rows.
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
Number of Rows in Sections Code
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
NSLog(#"Cell is");
return 1;
}
Cell Values
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle
reuseIdentifier:CellIdentifier] autorelease];
cell.selectionStyle=UITableViewCellSelectionStyleNone;
}
MultipleDetailViewsWithNavigatorAppDelegate *appDelegate = (MultipleDetailViewsWithNavigatorAppDelegate *)[[UIApplication sharedApplication] delegate];
cell.textLabel.font=[UIFont fontWithName:#"Helvetica" size:16];
cell.textLabel.textAlignment=UITextAlignmentLeft;
PublishData *theCellData = [appDelegate.publishArray objectAtIndex:indexPath.row];
NSLog(#"Cell is");
cell.textLabel.text =#"Test";
return cell;
}

Have you set datasource and delegate for the table view? I suspect not. Please set it in code or xib and check.

How you are have added table view ?. if you have added using interface builder then set your datasoure for the tableview. If you have added pro-grammatically then set [tableview setDatasoucre:self];

Programmatically adding a UITableView - how do I set the reuse identifier for the cells?

I have a UIViewController that at some point grows a UITableView, and when it does I simply init the TableView instance variable and add it to the view, but I'm not sure how to handle the dequeueing of cells to add to the view; I need a reuse identifier, but I'm not sure how to set it.
What do I do within this method?
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *cellIdentifier = #"wot";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier forIndexPath:indexPath];
return cell;
}

Use the method initWithStyle:reuseIdentifier
check if cell exists
If it doesn't, then you need to initialize it.
code
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath (NSIndexPath*)indexPath
{
static NSString *cellIdentifier = #"wot";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier forIndexPath:indexPath];
if (!cell)
cell = [[UITableViewCell alloc] initWithStyle: someStyle reuseIdentifier: cellIdentifier];
return cell;
}

The reuse identifier need not be explicitly defined.In the cellForRowAtIndexPath method the definitions you included in question is enough to work with
for Reference
Eg
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *MyIdentifier = #"MyReuseIdentifier";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:MyIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:MyIdentifier]];
}
Region *region = [regions objectAtIndex:indexPath.section];
TimeZoneWrapper *timeZoneWrapper = [region.timeZoneWrappers objectAtIndex:indexPath.row];
cell.textLabel.text = timeZoneWrapper.localeName;
return cell;
}

TableView not selectable

My TableView didn't coloring a cell blue when I click a cell. the InterfaceBuild has
Selection: Single Selection
Show Selection on Touch : YES
And my code in my table view controller is run when I tap the table
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
// code
}
EDIT
- (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];
cell.selectionStyle = UITableViewCellSelectionStyleNone;
}
NSString *item = (NSString *)[songList objectAtIndex:indexPath.row];
cell.textLabel.text = item;
return cell;
}

Realized my problem was the following line in my cellForRowIndexPath function
cell.selectionStyle = UITableViewCellSelectionStyleNone;

loading UITableView in tab based iPhone application?

i have a problem while loading a UITableView on UITabBarController, i got this error while loading table using tab
Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'UITableView dataSource must return a cell from tableView:cellForRowAtIndexPath:'
my code is here
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
// Return the number of sections.
return 2;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Return the number of rows in the section.
return 2;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
// Configure the cell...
return cell;
}
i tried many, it may be simple.. anyone please help me?

//Editing in your code, it should work.
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
// Return the number of sections.
return 2;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Return the number of rows in the section.
return 2;
}
- (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];
}
return cell;
}

The problems is that you are using dequeueReusableCellWithIdentifier but you have no code to handle if this returns nil (i.e. when no cells have yet been created to be re-used).
For example:
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil)
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];

Loading UITableViewController from code

I am having issues with what I can only imagine is a very simple problem. I am loading a UITableViewController class called LocationViewController from one UIViewController:
LocationViewController *lvc = [[LocationViewController alloc] init];
[self.navigationController pushViewController:lvc animated:true];
In this class I have the 3 following method implemented:
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return 3;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"CityCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
cell.textLabel.text = #"Test";
return cell;
}
And I am getting the following error:
UITableView dataSource must return a cell from tableView:cellForRowAtIndexPath:'
I have had this error before when transitioning between ViewControllers using the StoryBoard this was because the CellIdentifier was not correct. I have no idea what I am doing wrong. I have tried loading a nib file with this ViewController but that throws the same error.

You have to allocate the cell. use this code.
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
}

use this code
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease];
}
cell.textLabel.text = #"Test";
return cell;}

dequeueReusableCellWithIdentifier returns nil, if there is no object in the reusable-cell queue. check if cell is nil after calling dequeueReusableCellWithIdentifier, create a new UITableViewCell in that case.

dequeueReusableCellWithIdentifier is a cache of already created UITableViewCells with your identifier "CityCell"
If you use the code below, it tries to get a cell from the cache, and if it can't it will create one and then store it in the cell cache for later use.
You need the cache for large tables, as it drastically improves table performance when scrolling.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *MyIdentifier = #"CityCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:MyIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:MyIdentifier] autorelease];
}
cell.textLabel.text = #"Test";
return cell;
}
Take a look at the table view programming guide to learn more about this:
Table Programming Guide