I have a tableview that has groups. I would like to add a dummy cell at the top of each group, but not add it to the data. I dont want it saved. So if the top cell is clicked, its data passed will be blank and I can handle the passed view differently. I currently am configuring the cells manually.
So if group one had two entries, the display of those two entries would be prepended with a fake entry at what would be index 0
Below is a preview of what I am trying to do.
PS: Can one cell have a different disclosure icon? Does that break Interface Guidelines?
It would be something like this, you are not really adding anything to your model, you are just modifying your view:
- (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];
}
if ([indexPath row] == 0) {
//And any other default behavior
[[cell textLabel] setText:#""];
}
else{
//Your code for each cell
}
return cell;
}
The HIG doesn't mention anything about having different disclosure icons:
iOS includes some table-view elements that can extend the functionality of table views. Unless noted otherwise, these elements are suitable for use with table views only.
Related
In my tableview have custom cells that I initialize from a UITableViewCell class. I have sections for first letters of records and have an indexPath that is being created dynamically.
I wanted to add a search display controller to my tableview. So I did, created all methods to filter data. I am sure that my functions are working well because I am printing array count to screen for search results.
My problem is that the first time view loads, the data is on the screen. But when I hit the search input and type a letter, than I get 'UITableView dataSource must return a cell from tableView:cellForRowAtIndexPath:' error. After I used a breakpoint I saw that my custom cell is nil after searching. Data is exist, but cell is not being initialized.
Here is the code I use for custom cell initializing:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"ObjectCell";
SpeakerCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
NSDictionary *myObject = [[sections valueForKey:[[[sections allKeys] sortedArrayUsingSelector:#selector(localizedCaseInsensitiveCompare:)] objectAtIndex:indexPath.section]] objectAtIndex:indexPath.row];
cell.label1.text = [myObject objectForKey:#"myValue"];
return cell;
}
I believe I made a mistake when putting controls in IB. So I added screenshots of objects:
Connections inspector for my table view
Connections inspector for my search display controller
EDIT: Problem is actually solved, I have used a UISearchBar instead of Search Display Controller but I guess this issue remains unsolved. So I'm willing to try any ways to make it work.
As of here search display controller question,
you need to access the self.tableView instead of tableView:
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [self.tableView dequeueReusableCellWithIdentifier:#"CellId"];
// do your thing
return cell;
}
For those using iOS 5 and StoryBoards, you would want to use the following method instead of initWithIdentifier:
initWithStyle:(UITableViewCellStyle)stylereuseIdentifier:(NSString *)reuseIdentifier
Example:
NSString *cellIdentifier = #"ListItemCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
}
I'm not sure about how this should work in storeboarding.
But normally you would check if the [tableView dequeueReusableCellWithIdentifier:CellIdentifier] returns a cell.
Because if the cell in not loaded before or there aren't any cells to reuse you will have to create a new cell:
SpeakerCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[SpeakerCell alloc] initWithIdentifier: CellIdentifier];
}
Also when in declaring local variables in Objective-C we tent not to capitalize the first letter.
I had the same issue, with custom cells (built in Storyboard) not being drawn as soon as the first letter was put in the search field. The search was successful however.
Finally I found a good tutorial from Brenna Blackwell suggesting to configure manually the cell drawing in the corresponding subclass of UITableViewCell, adding UILabels and other items.
In my first view I have a UITableView with 5 records. In UITableView cells are holding two different components. One UILabel is text and another UILabel shows value for that cell.
On selection of this UITableViewCell user is navigated to another view where I have given a picker controller for changing the value of 2nd label in the table view for the selected row. I reload the UITableView data on -viewWillAppear but this overlaps the text on lables as many times I visit it.
Can anyone give me relevant example of hierarchical tableview where UItableViewCell's right section is dependant on selection of picker from next view.
I think you are adding the labels on cell.contentView everytime you reload the table, but are not removing the previous ones. Thats why the overlapping is happening.
try to remove the lables
- (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];
}
for (UIView * view in cell.contentView.subviews) {
[view removeFromSuperview];
view = nil;
}
// add your labels
}
i have a tableview that contains a uiwebview in its first row. i would like to change this tables' webview object with new one when user clicks a button. i am using the code given below but it does not work fine. older object is there and the newer one is over it although i recreate the webview. how can i remove the older one from cell?
thanks...
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
NSLog(#"NİL.......");
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
} else {
NSLog(#"NOT NİL.......");
}
[cell addSubview:webView];
return cell;
}
Since you are using "dequeueReusableCellWithIdentifier", your should reconfigure the cell each time when the cell is displayed.
Please remember that the cells with same identity will be reused. It's better to set the same identity to one particular type of cells, typically cells with same subviews and layout.
This is sample for how to load data and reconfigure a cell: http://code.google.com/p/tweetero/source/browse/trunk/Classes/MessageListController.m
Here is a tutorial to get familiar with UITableView:
http://developer.apple.com/library/ios/#documentation/userexperience/conceptual/TableView_iPhone/CreateConfigureTableView/CreateConfigureTableView.html
I have a UITableViewController which has two sections. The first section shows a single cell with centered text, saying Add a new Slide. The second section show the current slides.
When a user taps on the Add a new slide cell, a new UITableVeiwController is pushed onto the stack that shows an editor. If the user saves the new slide (by tapping save), the cell is added to the data source and the editor is popped from the stack.
I have two problems:
When the editor is popped, if a cell was deleted before Add a new slide was tapped, the old cell shows up instead of the new one. Popping the UITableViewController (by tapping the automatically generated back button) fixes this, but I'd like this to not happen at all. (Originally, popping the table did not update after popping the editor, so I added [self.tableView reloadData]; to the viewDidAppear method.)
After a certain number of slides, the last slide on the list becomes the Add a new slide cell. I know that the data is being entered properly because another part of the app, which uses the same data source, updates correctly. The table supports editing in the second section, and when you swap the order of the cells, it behaves correctly behind the scenes, but the wrong cell is still there.
What could be going on?
Here's some of my code:
Note that as I was gearing to post my code, I noticed a mismatch of the braces. The check for cell==nil seems to encompass the second part of the code which determines the content of the cells. This fixes the label of the cells in the second section of the table, but the style is still wrong. I've since fixed the code, but the original is posted here.
// 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) {
if ([indexPath section] == 0 ) {
cell = [[[MBTableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
}else if([indexPath section] == 1){
cell = [[[MBTableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease];
}
if ([indexPath section] == 0) {
[cell.textLabel setTextAlignment:UITextAlignmentCenter];
[cell.textLabel setText:#"Add a New Slide"];
}else if([indexPath section] == 1){
NSArray *storedViewsInfo = [[NSArray alloc] initWithArray:[kSettings arrayForKey:#"views"]];
if ([[[storedViewsInfo objectAtIndex:[indexPath row]] valueForKey:#"type"] isEqualToString:#"announcement"]) {
[cell.detailTextLabel setText:#"Custom Announcement"];
[cell.textLabel setText:[[[storedViewsInfo objectAtIndex:[indexPath row]] valueForKey:#"info"] valueForKey:#"text"]];
}
[storedViewsInfo release];
[cell setAccessoryType:UITableViewCellAccessoryDisclosureIndicator];
}
}
return cell;
}
Without seeing the code, first thing that comes to mind is checking if you've given your custom cells different identifiers in your - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath; method?
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier1 = #"CellIdentifier1";
static NSString *Cellidentifier2 = #"CellIdentifier2";
if (indexPath.section == kAddSlideSection) {
CustomCell *cellType1 = (CustomCell*) [tableView dequeueReusableCellWithIdentifier:CellIdentifier1];
...
} else {
CustomCell *cellType2 = (CustomCell*)[tableView dequeueReusableCellWithIdentifier:CellIdentifier2];
...
}
}
Also it might be worth considering implementing a delegate method that gets called when your user finishes adding the new slide - i.e. if successful call [self.tableview reloadData] from that method instead of in viewWillAppear.
I am programing a UITableView to behave as an inclusive selection list. My table displays correctly and allows for multiple cells to be selected with check boxes. My problem is that cells which have been selected (cells contain a check mark to the right) loose their selected status when scrolled out of view (cells check mark disappears). I want the selections made to cells in the table to be preserved even if cells are scrolled out of view. Does anyone have any idea what is causing this?
Here is my code inside of my TableViewController class:
- (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];
}
NSUInteger row = [indexPath row];
cell.textLabel.text = [widgetTitles_glob objectAtIndex:row];
cell.detailTextLabel.text = #"";
cell.textLabel.textColor = [UIColor blackColor];
cell.textLabel.font = [UIFont boldSystemFontOfSize:15];
cell.accessoryType = UITableViewCellAccessoryNone;
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
[tableView deselectRowAtIndexPath:[tableView indexPathForSelectedRow] animated:YES];
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
if (cell.accessoryType == UITableViewCellAccessoryNone) {
cell.accessoryType = UITableViewCellAccessoryCheckmark;
// Reflect selection in data model
} else if (cell.accessoryType == UITableViewCellAccessoryCheckmark) {
cell.accessoryType = UITableViewCellAccessoryNone;
// Reflect deselection in data model
}
}
Any help would be very much appreciated.
When you are using UITableView correctly, only as many UITableViewCell instances are allocated as are needed to fit on the screen. When you scroll down a table, and a cell disappears off the top of the screen, it is relocated to the bottom.
Your delegate method, tableView:cellForRowAtIndexPath: is responsible for setting up a cell, either creating a new one or reconfiguring a recycled one.
The proper thing to do is use an array to store your checked/unchecked values. When didSelectRowAtIndexPath: is called, you update the cell and your array. When tableView:cellForRowAtIndexPath: is called, you configure the cell based on the values in the array.
Based on your comments, you are already doing the right thing in didSelectRowAtIndexPath:; you just need to use those values when you set up the cell instance, because that cell could represent a row that has already been checked. Check the array and then set cell.accessoryType accordingly.
In cellForRowAtIndexPath: you were assigining the accessoryType as none, so whenever you scroll that delegate is called and set the accessory type as none. So you should change your code.
I have also faced this problem once; I came up with a solution as follows.
Store the indexPath.row values of selected indexPath in an array (this code should be in didSelectRowAtIndexPath delegate) if it is deselected remove from that array. In cellForRowAtIndexPath: method I have used a for loop and check if that indexPath.row is present then change it's accessory type to checkmark else none.
Thanks for your help. It actually turns out that the reason why the cells were getting reset to UITableViewCellAccessoryNone was becasue of the following line of code inside of cellForRowAtindexPath:
cell.accessoryType = UITableViewCellAccessoryNone;
Removing this has fixed the table.