HI #ll!
I want to add and remove some items to my datasource for my tableview programmatically.
First of all: What do I want to achieve?
I habe a UIView with a TTTableView control (the Tableview from the Three20 project, but derived from the common UITableView control). This TableView is working well and has a TTSegmentedDataSource object attached as datasource. Currently the TableView is showing a UISwitch component. What I want to do is, to show and hide some items above the UISwitch control according to the state of the switch. And the elements should hide and show using the common TableView animations, just like the user has added or removed an item.
I already tried severeal aproaches to do so, but I don't get it.
For example:
[self.treeView beginUpdates];
[[((TTSegmentedDataSource*)self.treeView.datasource).items objectAtIndex:0] removeObject: objectToBeRemoved];
[self.treeView endUpdates];
[self.treeView reloadData];
This didn't work, and also throwed an exception.
What is the solution? How can I programmatically add and remove items from a TableView?
Hoping you can help me! THX!
C YA
Try looking into:
-(void)insertSections:(NSIndexSet *)sections withRowAnimation:UITableViewRowAnimation)animation
-(void)insertRowsAtIndexPaths:(NSArray *)indexPaths withRowAnimation:(UITableViewRowAnimation)animation
Thanks for your hint cooltechnomax.
I found the solution. Here is an example:
[states removeObjectAtIndex:4]; // Washington
[states removeObjectAtIndex:2]; // Delaware
[states insertObject:#"Alaska" atIndex:0];
[states insertObject:#"Georgia" atIndex:3];
[states insertObject:#"Virginia" atIndex:5];
NSArray *deleteIndexPaths = [NSArray arrayWithObjects:
[NSIndexPath indexPathForRow:2 inSection:0],
[NSIndexPath indexPathForRow:4 inSection:0],
nil];
NSArray *insertIndexPaths = [NSArray arrayWithObjects:
[NSIndexPath indexPathForRow:0 inSection:0],
[NSIndexPath indexPathForRow:3 inSection:0],
[NSIndexPath indexPathForRow:5 inSection:0],
nil];
UITableView *tv = (UITableView *)self.view;
[tv beginUpdates];
[tv insertRowsAtIndexPaths:insertIndexPaths withRowAnimation:UITableViewRowAnimationRight];
[tv deleteRowsAtIndexPaths:deleteIndexPaths withRowAnimation:UITableViewRowAnimationFade];
[tv endUpdates];
What about just modify the model and call "reloadData"
[tv reloadData]
Related
Instead of a
[table reloadData]
Is there a way to tell the table to reload just one row? There are reasons for my madness.
It's in the docs. The method is called reloadRowsAtIndexPaths:withRowAnimation:. So you'd do something like:
NSArray *indexPaths = [NSArray arrayWithObjects:
[NSIndexPath indexPathForRow:5 inSection:2],
// Add some more index paths if you want here
nil];
[tableView reloadRowsAtIndexPaths:indexPaths withRowAnimation: UITableViewRowAnimationFade];
Yes there is:
(void)reloadRowsAtIndexPaths:(NSArray *)indexPaths
withRowAnimation:(UITableViewRowAnnimation *)annimationStyle
I have a UITableView. I'm population it from a NSDictionary with arrays for each set of items on the table: labels, footers, Headers, UIViews, etc.
In section 0, I want a row #2 appear when a switch in row #1 is switched to on.
What I have done and it works is, in numberOfRowsInSection I added this code:
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
if (interruptor.isOn==NO && section==0) {
return [[[infoTableContentArray objectAtIndex: section] objectForKey:kLabelKey] count]-1;
}else{
return [[[infoTableContentArray objectAtIndex: section] objectForKey:kLabelKey] count];
}
}
and the action linked to the switch (interruptor) is:
-(IBAction)accioInterruptor:(id)sender{
[infoAndSettingsTable reloadData];
}
so when the switch is switched, the table reloads and the cell appears or disappears.
it actually works, but there is no animation, which makes it, mhh... well, you know.
I've tried to implement the reloadRowsAtIndexPaths:withRowAnimation, adding it to the code called by the switch:
-(IBAction)accioInterruptor:(id)sender{
[infoAndSettingsTable beginUpdates];
[infoAndSettingsTable reloadRowsAtIndexPaths:[[infoTableContentArray objectAtIndex: 0] objectForKey:kLabelKey] withRowAnimation:UITableViewRowAnimationBottom];
[infoAndSettingsTable endUpdates];
}
But, it dowsn't work. It crashed on the line [infoAndSettingsTable endsUpdates];
BTW, in all the cases the following:
[[infoTableContentArray objectAtIndex: 0]
is the array which contains the labels for that section.
Am I doing it right or I'm Epic-Failing alltogether?
Thanks in advance!
simple way to do this......
[self.tableView beginUpdates];
[self.tableView insertRowsAtIndexPaths:insertIndexPaths withRowAnimation:UITableViewRowAnimationFade];
[self.tableView deleteRowsAtIndexPaths:deleteIndexPaths withRowAnimation:UITableViewRowAnimationFade];
[self.tableView endUpdates];
insertIndexPaths is an array of NSIndexPaths to be inserted to your table.
deleteIndexPaths is a array of NSIndexPaths to be deleted from your table.
Example array format for index paths :
NSArray *insertIndexPaths = [[NSArray alloc] initWithObjects:
[NSIndexPath indexPathForRow:0 inSection:0],
[NSIndexPath indexPathForRow:1 inSection:0],
[NSIndexPath indexPathForRow:2 inSection:0],
nil];
got it from this question
the argument to reloadRowsAtIndexPaths: should be an array of NSIndexPath objects identifying the rows you want to reload, not the labels for that section. Also, looks like you want to reload a section so I would try the following:
-(IBAction)accioInterruptor:(id)sender {
[self reloadSections:[NSIndexSet indexSetWithIndex:0] withRowAnimation:UITableViewRowAnimationBottom];
}
Why don't you just use UITableView's insertRowsAtIndexPaths:withRowAnimation:? It has been built exactly for this purpose, the UITableView class reference has the exact description and usage examples.
Apart from being cleaner it is also more performant since you don't have to reload the entire table (only really matters if you have lots of cells in it though)
I am Having an application where, if the user enters data the rows will be updated with that data
Can i use One Single Button say 'delete' which when clicked will delete all the rows in the tableview at once.?
Yes you can do that. First remove all data from your data source, then reload your table. For ex. -
[yourArrayDataSource removeAllObjects];
[yourTable reloadData];
To animate the deletion of rows - do this in an IBAction method & link it to your UIButton. As soon as you press the button you will have a smooth awesome animation making all your rows fade out.
-(IBAction)deleteRows
{
[yourTable beginUpdates];
for(int i=0; i<[yourArrayDataSource count]; i++)
{
indexPath = [NSIndexPath indexPathForRow:i inSection:0];
[self.searchResTable deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
}
[yourTable endUpdates];
}
There are various animations that you can use here-
UITableViewRowAnimationBottom
UITableViewRowAnimationFade
UITableViewRowAnimationMiddle
UITableViewRowAnimationNone
UITableViewRowAnimationRight
UITableViewRowAnimationTop
make a button and in the button action method
-(IBAction)deleteRows
{
[array removeAllObjects];
[tableview reloadData];
}
Srikar's answer put me on the right track, but creates a lot of extra single item arrays, and calls deleteRowsAtIndexPaths far more than is needed.
-(void)clearTable
{
NSMutableArray *indexPaths = [NSMutableArray array];
for(int i=0; i<[self.myArray count]; i++)
{
NSIndexPath *anIndexPath = [NSIndexPath indexPathForRow:i inSection:0];
[indexPaths addObject:anIndexPath];
}
[self.myTableView beginUpdates];
[self.myTableView deleteRowsAtIndexPaths:indexPaths withRowAnimation:UITableViewRowAnimationFade];
self.myArray = [NSArray array];
[self.myTableView endUpdates];
}
Is there a way that a UITableView pops up when i select a row in a table?
thanks in advance.
In your UITableView delegate method:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
[tableView deselectRowAtIndexPath:indexPath animated:NO];
[self.view addSubview:myView];
}
Here, myView is the view which you have IBOutlet.
like
in .h file
IBOutlet UIView *myView;
Let me know in case of any difficulty.
Cheers.
Yes there is a way on row selection method you have to fire up a method which creates auiview smaller in size as desired and in that view table view as subview.
Plz specify what type or kind of pop-up you want to appear.
OK, I understand now.
You should use table view's updating methods:
[myTableView beginUpdates];
NSArray *indexPaths = [NSArray arrayWithObjects:
[NSIndexPath indexPathForRow:0 inSection:1],
[NSIndexPath indexPathForRow:1 inSection:1],
[NSIndexPath indexPathForRow:2 inSection:1],
[NSIndexPath indexPathForRow:3 inSection:1],nil];
[myTableView insertRowsAtIndexPaths:indexPaths withRowAnation:UITableViewRowAnimationTop];
[myTableView endUpdates];
I have a UITableView. I want to update the table data based on selection made. Right now I use [mytable reloadData]; I want to know if there is any way where I can just update the particular cell which is selected. Can I modify by using NSIndexPath or others? Any suggestions?
Thanks.
For iOS 3.0 and above, you just have to call :
- (void)reloadRowsAtIndexPaths:(NSArray *)indexPaths withRowAnimation:(UITableViewRowAnimation)animation;
To reload row 3 of section 2 and row 4 of section 3 for example, you'll have to do this :
// Build the two index paths
NSIndexPath* indexPath1 = [NSIndexPath indexPathForRow:3 inSection:2];
NSIndexPath* indexPath2 = [NSIndexPath indexPathForRow:4 inSection:3];
// Add them in an index path array
NSArray* indexArray = [NSArray arrayWithObjects:indexPath1, indexPath2, nil];
// Launch reload for the two index path
[self.tableView reloadRowsAtIndexPaths:indexArray withRowAnimation:UITableViewRowAnimationFade];
You can also get a reference to the UITableViewCell object and change its labels, etc.
UITableViewCell *cell = [self.tableView cellForRowAtIndexPath:indexPath];
cell.textLabel.text = #"Hey, I've changed!";
I think you're looking for this method of UITableView:
- (void)reloadRowsAtIndexPaths:(NSArray *)indexPaths withRowAnimation:(UITableViewRowAnimation)animation