I have a UITableView in my nib file and would like to dynamically add some content to each of the cells in that TableView. Is there a way to do this? I have an array of text that I would like to display in the TableView as well as an array of Pictures.
You need to implement the UITableViewDataSource protocol and override the
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
and
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
methods. You will want to return the length of your array for the tableView:numberOfRowsInSection: method. In the tableView:cellForRowAtIndexPath: method you will get create the UITableViewCell (dequeue one if available) and add the UIViews you want to hold your data (i.e. a UIImage, etc.). Access the data to populate your view using the indexPath.row as the index to your array(s). Does that all make sense? It sounds a bit more complicated than it is in practice.
Here is the documentation for the UITableViewDataSource protocol
My ideal is to register as an observer for each cell, then the interested content has changed, then it sends event or necessary data to those cells. By comparing some information, like current indexPath, or some unique identifier of cell, the cell can decide to accept those sent data and change himself, or just pass this sent event and data.
I has implemented above for loading thumbnail image in the background, when the image has been loaded, it notify those cells to update images. And if any source data has been modified, it will notify the those registered cells, then those cells will reload necessary data to update their content.
If you want add cell and data on that cell dynamically from one view controller to other Tableview controler----
Step--1:[[NSNotificationCenter defaultCenter] postNotificationName:#"ReturnTableView" object:(send array object or any object)];
Step--2:go to your Table View controller
Step--3:In YourTableView.h file add this method : - (void)change_view:(NSNotification *)notif;
Step--4:Now Came in YourTableView.m file add the line in viewDidLoad ---[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(change_view:) name:#"ReturnTableView" object:nil];
Step--5:Now Add the method in YourTableView.m ----
- (void)change_view:(NSNotification *)notif {
if([[notif name] isEqualToString:#"ReturnTableView"]){
Your Object Ref(Obj-1)=[notif object];
[Obj-1 addObjectsFromArray:self.AnotherMutableArray(obj-2)];
self.obj-2=Obj-1;
[self.tableView reloadData];
}
}
Step--6:Now Add Finally in
(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"CellIdentifierName"];
UILabel *label;
label = (UILabel *)[cell viewWithTag:TagNo(e.g:0)];
label.text = [self.messageposts objectAtIndex:indexPath.row];
label = (UILabel *)[cell viewWithTag:TagNo(e.g:1)];
label.text = [self.messageposts objectAtIndex:indexPath.row];
return cell;
}
Now Your Data Is Added
Thanks-----
Related
When someone selects a cell in a collection view (about 15 cells) inside the
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
method I am trying to change a label I have placed in the one header by using
UICollectionReusableView *headerView = [collectionView dequeueReusableSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:#"Header" forIndexPath:indexPath];
UILabel *headerTitle=(UILabel *)[headerView viewWithTag:1];
headerTitle.text=#"test";
the tag and everything is set correctly, but it does not change. Any thoughts on where I'm going wrong?
You already have a header view, so dequeuing one creates another one which is not the one you're trying to change. There is no way to access a header view in a collection view -- there's no headerForSection: method, so you have to change the label through your data source. So, if you just have the one header, then you should have a string property, lets call it headerTitle, that you use to populate the label in the header. So, your implementation of collectionView:viewForSupplementaryElementOfKind:atIndexPath: should look something like this:
-(UICollectionReusableView *)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath {
RDReusableHeader *headerView;
if (kind == UICollectionElementKindSectionHeader){
headerView = [collectionView dequeueReusableSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:#"MyView" forIndexPath:indexPath];
headerView.label.text = self.headerTitle;
}
return headerView;
}
Then in didSelectItemAtIndexPath:, assign a new value to that property and call reloadData on the collection view.
self.headerTitle = #"This is the New Tilte";
[self.collectionView reloadData];
Wanting to create a static menu (IOS 5) and attempting to create custom cells within the storyboard to then load onto the grouped tableview.
I've created the outlet
#property(nonatomic,strong) IBOutlet UITableViewCell *labelCell;
The ViewController class is set to the proper TableViewController and I've connected the custom cell to this outlet.
I also have the delegate and datasource set up.
I've got
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
return self.labelCell;
}
I'm sure there is a ton wrong with this, but I'm just trying to display one cell and go from there. There does not seem to be any examples of doing custom cells within the IB through the storyboard. I can still use the old way of creating a xib file and loading it in the mainBundle but I just want to stay up to date I guess.
but with what I have above i get a crash when I load this view controller. SIGABRT
Here is what I've learned about how you get cells for your table when using the storyboard. When you drag a UITableView into your view, it comes with a prototype cell already set as a subview. To use this prototype cell, set a unique reuse identifier in the attributes inspector, and then use the same identifier to dequeue the cell in your cellForRowAtIndexPath: method. I leave out the code for creating a cell from scratch if the dequeue call returns nil; I don't think it can happen. So just dequeue the cell, configure it with the usual UITableViewCell methods, and return it.
But you can also create custom subclasses of UITableViewCell. Just set the class name in the storyboard's class identity inspector, and drag whatever elements you want from the Objects palette into your cell. Then create IBOutlet properties for them in your subclass's code files, and hook them up to the cell in the storyboard in the usual way. This is so much better than having to do it all in code!
And finally, you can have more than one kind of cell in your table. Just drag UITableViewCell objects from the palette into the table, and give each one a unique reuse identifier in the attributes inspector. In your cellForRowAtIndexPath: method, choose the type of each cell and you can have a very flexible table view.
If you have set your UITableView to be using 'Static Cells' in the storyboard, you don't need to implement any of the UITableViewDataSource methods and you can modify the cell directly in Interface Builder. For a single label cell, select the cell and change it's type to 'Basic'. You can now edit the cell just like you would any other view object.
This tutorial was helpful to me. You can reference whatever object you need through the tag.
In the Storyboard drag on a UIImageView or UILabel etc. and set the tag to 100 (whatever you want) then in your - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath use the tag to reference it.
Here is the example code in the tutorial, just remember to set the tags in the storyboard:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
// Configure the cell...
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
// Display recipe in the table cell
Recipe *recipe = [recipes objectAtIndex:indexPath.row];
UIImageView *recipeImageView = (UIImageView *)[cell viewWithTag:100];
recipeImageView.image = [UIImage imageNamed:recipe.imageFile];
UILabel *recipeNameLabel = (UILabel *)[cell viewWithTag:101];
recipeNameLabel.text = recipe.name;
UILabel *recipeDetailLabel = (UILabel *)[cell viewWithTag:102];
recipeDetailLabel.text = recipe.detail;
return cell;
}
I have UITable which contains some UIButtons. I would like a way to use the label.
The problem I have is that I need two tag labels, one for retrieving the cell in tableviewCellWithReuseIdentifier and configureCell.
Until recently I have been using the UIButton.title to determine which row in the table I selected. The (invisible) text was the row number.
Now I need to use the title for some visible text. How can I still find which row was pressed?
When I press the area outside the button the usual didSelectRowAtIndexPath is called. The hard part is that I want to capture both the UIButton (which calls its own selector) and the row, which I had been finding out from the title. Now I need the title for something else.
I use something like this. This will get you the indexpath in the tableview.
- (IBAction)buttonAction:(id)sender {
UIButton *button = (UIButton *)sender;
CGPoint buttonOriginInTableView = [button convertPoint:CGPointZero toView:tableView];
NSIndexPath *indexPath = [tableView indexPathForRowAtPoint:buttonOriginInTableView];
// do something
}
You could subclass UITableViewCell or UIButton and add some properties.
You should implement the UITableViewDelegate protocol.
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
// Do something based on selected row (indexPath.row)
}
Implement the UITableViewDelegate protocol. It will help you and do what you need.
didSelectRowAtIndexPath is autmatically called whenever a row is selected in your table.
in your .m file the one with the table view controller if there isn't one there add this method:
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
// NSInteger row = [indexPath row];
// or (indexPath.row)
// do whatever you like with this value which tells you which row is selected.
}
PK
UIButton * button;
I have put cell.accessoryView = button;
In didSelectRowAtIndexPath i have written above code,but it doesn't show UIButton on cell of UITabelView
You need to put this in the delegate method -tableView:cellForRowAtIndexPath: that initializes and returns cells for the table view:
- (UITableViewCell *) tableView:(UITableView *)tv cellForRowAtIndexPath:(NSIndexPath *)indexPath {
// initialize cell and contents here, for the specified indexPath value
}
You might want to read the Table View Programming Guide for iPhone OS, which explains this in detail.
I want to add the content of the cell of tableview in other view when i click on the tableview cell , how can i pass the values of the cell to other view.
If you want use the text of a cellview for example you can do that in your UITableViewDelegate (or your UITableViewController):
// Tells the delegate that the specified row is now deselected.
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *targetCell = [tableView cellForRowAtIndexPath:indexPath];
NSString *contentCell = [targetCell textLabel];
// Do something with the contentCell
}
In your table view delegate (by default, it's the table view controller) implement the following method:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
Use indexPath as you did in -tableView:cellForRowAtIndexPath: to get the values you need. To avoid unexpected behavior you should extract the values from your model rather than the cell.