I have this scene:
I added one simple "table view" and next +1 into "prototype cells":
informacao.h
NSMutableArray *arrCursos;
informacao.m
- (void)viewDidLoad
{
[super viewDidLoad];
self.title = #"Informações";
arrCursos = [[NSMutableArray alloc] init];
[arrCursos addObject:#"[G] - Odontologia"];
[arrCursos addObject:#"[P/LT] - Odontologia"];
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [arrCursos count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"cursosCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if(cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
cell.textLabel.text = [arrCursos objectAtIndex:indexPath.row];
return cell;
}
I don't know why my table view is empty, like this:
Now, there are a few places you should check. First is whether the table view data source has been connected to the view controller. Check if the number of rows data source method is called and whether it is returning the expected number of rows.
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
NSLog(#"%d", arrCursos.count);
return [arrCursos count];
}
Second is to check whether you have specified the cell identifier cursosCell in your storyboard.
the problem was missing delegate and datasource
Related
I'd like to do following: After clicking a row in a tableview, I want to set value of some variable and in the same time change the cell accessory type to checkmark. Here is my implementation file:
- (void)viewDidLoad
{
[super viewDidLoad];
tabledata = [[NSArray alloc] initWithObjects:#"row1", #"row2", #"row3", nil];
// Do any additional setup after loading the view.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark - TableView Data Source methods
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [tabledata count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = nil;
cell = [tableView dequeueReusableCellWithIdentifier:#"Row"];
if (cell == nil)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:#"Row"];
}
cell.textLabel.text = [tabledata objectAtIndex:indexPath.row];
return cell;
}
#pragma mark TableVoew Delegate methods
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
//if row1 is selected change 'value' to 1 and change cell accessory to checkmark (other cells accessory to none)
//if row2 is selected change 'value' to 2 and change cell accessory to checkmark (other cells accessory to none)
//if row3 is selected change 'value' to 2 and change cell accessory to checkmark (other cells accessory to none)
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
self.value = indexPath.row;
UITableViewCell *cell = [self.tableView cellForRowAtIndexPath:nowIndex];
cell.accessoryType = UITableViewCellAccessoryCheckmark;
}
EDIT
Set only the accessory for selected row in - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
cell.accessoryType = UITableViewAccessoryNone;
if (indexPath.row == self.value) {
cell.accessoryType = UITableViewCellAccessoryCheckmark;
}
See this to remove checkmarks from currently visible cells in tableview.
EDIT 2
To unselect the previous row, do this in didSelectRowAtIndexPath
NSIndexPath *oldIndexPath = [NSIndexPath indexPathForRow:index inSection:1];
NSLog(#"Oldindexpath is: %#", oldIndexPath);
UITableViewCell *newCell = [tableView cellForRowAtIndexPath:indexPath];
if (newCell.accessoryType == UITableViewCellAccessoryNone) {
newCell.accessoryType = UITableViewCellAccessoryCheckmark;
}
UITableViewCell *oldCell = [tableView cellForRowAtIndexPath:oldIndexPath];
if (oldCell != newCell){
if (oldCell.accessoryType == UITableViewCellAccessoryCheckmark) {
oldCell.accessoryType = UITableViewCellAccessoryNone;
}
}
This solved my problem with removing old checkmarks:
for (UITableViewCell *cell in [tableView visibleCells]) {
cell.accessoryType = UITableViewCellAccessoryNone;
}
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
cell.accessoryType = UITableViewCellAccessoryCheckmark;
and problem with setting value of current row was solved in previous answer.
I have a Master-Detail application. When the user selects a row in the Master table(MasterViewController),I want to open another UITableViewController (DocumentViewController) and display data here(not in the Detail view).
When I run the application,"numberOfSectionsInTableView" for DocumentViewController is called but "cellForRowAtIndexPath" is not called.
The code in DocumentViewController.m is:
- (void)viewDidLoad
{
[super viewDidLoad];
[docTable setDataSource:self];
[docTable setDelegate:self];
EDViPadDocSyncService *service = [[EDViPadDocSyncService alloc]init];
EDVCategory *cat = [EDVCategory alloc];
cat.categoryId = [catId intValue];
[service getDocsByCatId:self action:#selector(getDocsByCatIdHandler:) category:cat];
[self.docTable reloadData];
}
- (void) getDocsByCatIdHandler: (id)value {
//snip......
[docTable reloadData];
}
- (void)viewDidUnload
{
[super viewDidUnload];
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [self.myDocList count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
DocumentCell *cell = [tableView dequeueReusableCellWithIdentifier:#"DocumentCell"];
if (cell == nil)
{
cell = [[[DocumentCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:#"DocumentCell"] autorelease];
}
NSLog(#"cell text=%#",[self.myDocList objectAtIndex:indexPath.row]);
cell.lblDocName.text = [self.myDocList objectAtIndex:indexPath.row];
return cell;
}
Thanks for the help.
EDIT:- I have set the delegate and datasource properties for the table.The table is declared as "#property (nonatomic,retain) IBOutlet UITableView *docTable;" in the DocumentViewController.h. I have tried using 'viewwillappear' as well as 'initwithstyle' but these doesn't seem to work either.
I'm new to X-Code and have just started working on my first app. I'm using Storyboards. To the Navigation Controller scene I've added a MasterViewController with two cells, which leads to two DetailViewControllers (Detail1 & Detail 2).
Number of Columns = 1
Number of rows in columns = 2
I've added a Reuse Indicator for the cells in the attributes inspector, and made the connection in the storyboard.
But when I run the app, I can only see the first cell x2.
When I look in the MasterViewController.m I can see the code for the first cell, but I don't understand how to insert the second cell etc!
I know the solution is easy and I've been looking for the answer for 3 days now, I feel stupid but I really need some help now,,
Can someone help me understand how to add more cells in the code, and maybe understand the Table View Code a bit more?
This is the code for the table view so far:
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
// Return the number of sections.
return 1;
}
- (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 = #"Formal";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
// Configure the cell...
return cell;
}
/*
// Override to support conditional editing of the table view.
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
{
// Return NO if you do not want the specified item to be editable.
return YES;
}
*/
/*
// Override to support editing the table view.
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
if (editingStyle == UITableViewCellEditingStyleDelete) {
// Delete the row from the data source
[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath][withRowAnimation:UITableViewRowAnimationFade];
}
else if (editingStyle == UITableViewCellEditingStyleInsert) {
// Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
}
}
*/
/*
// Override to support rearranging the table view.
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath
{
}
*/
/*
// Override to support conditional rearranging of the table view.
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath
{
// Return NO if you do not want the item to be re-orderable.
return YES;
}
*/
#pragma mark - Table view delegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
// Navigation logic may go here. Create and push another view controller.
/*
<#DetailViewController#> *detailViewController = [[<#DetailViewController#> alloc] initWithNibName:#"<#Nib name#>" bundle:nil];
// ...
// Pass the selected object to the new view controller.
[self.navigationController pushViewController:detailViewController animated:YES];
*/
}
#end
Lets say you have an array called arr.
Then you have to return the number of objects in the array when numberOfRowsInSection gets called.
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Return the number of rows in the section.
return [arr count];
}
Your cellForRowAtIndexPath delegate method should look like this to print out the strings in the array.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = #"Formal";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle
reuseIdentifier:CellIdentifier] autorelease];
}
// Configure the cell.
cell.textLabel.text = [arr objectAtIndex:indexPath.row];
return cell;
}
Hope this helps!
My code now looks like this:
- (void)viewDidLoad
{
[super viewDidLoad];
omMeny = [[NSMutableArray alloc] init];
//Add items
[omMeny addObject:#"Formålet med guiden"];
[omMeny addObject:#"Aromahjulet"];
[omMeny addObject:#"Fagterm"];
//Set the title
self.navigationItem.title = #"Om Rødvin";
}
//dealloc method declared in RootViewController.m
- (void)dealloc {
[omMeny release];
[super dealloc];
}
// Uncomment the following line to preserve selection between presentations.
// self.clearsSelectionOnViewWillAppear = NO;
// Uncomment the following line to display an Edit button in the navigation bar for this view controller.
// self.navigationItem.rightBarButtonItem = self.editButtonItem;
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
// Return the number of sections.
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Return the number of rows in the section.
// return 2;
return [omMeny count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Om";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
}
// Set up the cell...
NSString *cellValue = [omMeny objectAtIndex:indexPath.row];
cell.textLabel.text = cellValue;
// Configure the cell...
return cell;
}
#pragma mark - Table view delegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
// Navigation logic may go here. Create and push another view controller.
/*
<#DetailViewController#> *detailViewController = [[<#DetailViewController#> alloc] initWithNibName:#"<#Nib name#>" bundle:nil];
// ...
// Pass the selected object to the new view controller.
[self.navigationController pushViewController:detailViewController animated:YES];
*/
}
#end
with this in the .h
#interface OmMasterViewController : UITableViewController {
NSMutableArray *omMeny;
}
I am adding user defined text in a UItableView via a modal view controller.
The table is created as a NSMutableArray. on entering data in the modal view and tapping a Done button a Invalid update: invalid number of sections. error is generated.
I must update the array when the user enters data but not sure how to do that. I have attached the relevant code. Thanks for your advice.
//Number of sections
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { return 1; }
//Number of rows
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [listOfConjProcedures count];
}
//Loading the 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];
}
// Configure the cell.
cell.textLabel.text = [listOfConjProcedures objectAtIndex:indexPath.row];
return cell;
}
//Done button Delegate for the modal view
- (void)itemDetailViewController:(ItemDetailViewController *)controller didFinishAddingItem:(ChecklistItem *)item
{
int newRowIndex = [listOfConjProcedures indexOfObject:item];
[listOfConjProcedures addObject:item];
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:newRowIndex inSection:0];
NSArray *indexPaths = [NSArray arrayWithObject:indexPath];
[self.tableView insertRowsAtIndexPaths:indexPaths withRowAnimation:UITableViewRowAnimationAutomatic];
[self dismissViewControllerAnimated:YES completion:nil];
}
I think your problem may be here:
int newRowIndex = [listOfConjProcedures indexOfObject:item];
This wouldn't have an index unless you'd already added it to the array, but in the next line you add it to the array, so it doesn't make sense.
I think you are therefore adding a row at index path 0,NSNotFound, which will confuse the table view. Either use the count of the array as the row index, or insert your new row at the start (0,0) of the table (and at index 0 of the array).
I am a newbie. I have written some code for UITable but I am unable to update table values after adding the values to the array. I'm using a tableview subclass. The code is as follows. Check the last function. Now how can I update my table values?
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
//#warning Potentially incomplete method implementation.
// Return the number of sections.
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
//#warning Incomplete method implementation.
// Return the number of rows in the section.
return [_phones count];
}
- (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];
}
HLPFoundPhones *p = (HLPFoundPhones *)[_phones objectAtIndex:indexPath.row];
NSString *subtitle = [NSString stringWithFormat:#"Found (%1.2f,%1.2f) on %#" ,[p loc].x, [p loc].y , [p foundDate]];
cell.textLabel.text = [p name];
cell.detailTextLabel.text = subtitle;
return cell;
}
- (void)insertNewObject
{
HLPPhonesAdd *view = [[HLPPhonesAdd alloc]initWithNibName:#"HLPPhonesAdd" bundle:nil];
[self.navigationController pushViewController:view animated:YES];
[view release];
}
- (void)updateTable:(CGPoint)loc name:(NSString *)_name{
HLPFoundPhones *a = [[HLPFoundPhones alloc]initWithLoc:loc name:_name];
[_phones addObject:a];
[phones reloadData];
}
call
[yourTableView reloadData];
in your updateTable Function..
- (void)updateTable:(CGPoint)loc name:(NSString *)_name{
HLPFoundPhones *a = [[HLPFoundPhones alloc]initWithLoc:loc name:_name];
[_phones addObject:a];
//give your tableView object instead of yourTableView
[yourTableView reloadData];
}
check value of _phone count and use in function
- (void)updateTable:(CGPoint)loc name:(NSString *)_name
{
HLPFoundPhones *a = [[HLPFoundPhones alloc]initWithLoc:loc name:_name];
[_phones addObject:a];
[table_name reloaddata];
}
Confirm the array _phones is allocated.
Then there will be problems if the [tableview reloadData] is called inside a thread.
So confirm the reloadData is called from the main thread.
First of all, your cell identifier looks to be same for all cells, which may confuse iOS which cell needs to be dequeued. So, keep your cell identifiers unique, something like below :
NSString *cellIdentifier = [NSString stringWithFormat:#"Cell-%d", indexPath.row];
then, after table view is first displayed, update your datasource and call:
[tableView reloadData];