This question is bit related to my earlier question
I am newbie for iPhone application and trying to learn UITableView with JSON. I followed this video for learning.
I created same example using Stoaryboard and also added new screen where I can add data. Now I was trying to delete the data. So what I did is thought is instead of below method, I will add button on each row and on clicking of that I will delete the data.
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
But I am not getting how I will get the row details and how to delete.
Any help/ suggestion would be grateful.
Below is how my screen looks like.
Note:
The UITableViewCell is of CUSTOM type.
Update the data model according to edit actions delete using bellow code.
This bellow code is just an example for hot to delete or remove the object from array and also from table .. for more info check the tutorial which i post the link bellow..
- (void)tableView:(UITableView *)aTableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
if (editingStyle == UITableViewCellEditingStyleDelete) {
[arryData removeObjectAtIndex:indexPath.row];
[tblSimpleTable reloadData];
}
}
or also using this bellow logic with custom button of cell...
- (IBAction)deleteCustomCellWithUIButton:(id)sender
{
NSIndexPath *indexPath = [yourTableView indexPathForCell:(UITableViewCell *)[[[sender superview] superview] superview]];
NSUInteger row = [indexPath row];
[yourTableView removeObjectAtIndex:row];
[yourTableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
}
For more info refer these tutorial...
iphone-sdk-tutorial-add-delete-reorder-UITableView-row
multiple-row-selection-and-editing-in
You can add a button on each row and set the button.tag to the indexPath.row in the cellForRowAtIndex: method. Then in your button method you can delete the entry from the Array that is used to populate the UITableView and then reloadData
You have many way to get cell or indexPath of cell:
(UITableViewCell *)cellForRowAtIndexPath:(NSIndexPath *)indexPath
(NSIndexPath *)indexPathForCell:(UITableViewCell *)cell
(NSIndexPath *)indexPathForRowAtPoint:(CGPoint)point
(NSArray *)indexPathsForRowsInRect:(CGRect)rect
(NSArray *)visibleCells
(NSArray *)indexPathsForVisibleRows
If you want to handel IBAction of UIButton than use indexPathForRowAtPoint like this :
-(IBAction)myAction:(id)sender
{
CGPoint location = [sender convertPoint:CGPointZero toView:self.tableView];
NSIndexPath *indexPath = [self.tableView indexPathForRowAtPoint:location];
UITableViewCell *swipeCell = [self.tableView cellForRowAtIndexPath:indexPath];
NSLog(#"Selected row: %d", indexPath.row);
//......
}
OR indexPathForCell
- (void)buttonPressedAction:(id)sender
{
UIButton *button = (UIButton *)sender;
// Get the UITableViewCell which is the superview of the UITableViewCellContentView which is the superview of the UIButton
(UITableViewCell*)cell = [[button superview] superview];
int row = [myTable indexPathForCell:cell].row;
}
I have taken code from :
Detecting which UIButton was pressed in a UITableView
Custom UITableViewCell button action?
Related
This question already has answers here:
How to know the UITableview row number
(10 answers)
Closed 9 years ago.
I have a UITableView for which I have created a custom UITableViewCell. Each row in tableview has a button. I want to know the section number on click of a button, so that I would know that from which section button has been clicked. I have already tried few things found on stack but nothing is working.
UIButton *b = sender;
NSIndexPath *path = [NSIndexPath indexPathForRow:b.tag inSection:0];
NSLog(#"Row %d - Section : %d", path.row, path.section);
Don't know what you've tried, but i might do something like this. Doing some pseudocode from memory, here.
- (void)buttonClicked:(id)sender {
CGPoint buttonOrigin = [sender frame].origin;
// this converts the coordinate system of the origin from the button's superview to the table view's coordinate system.
CGPoint originInTableView = [self.tableView convertPoint:buttonOrigin fromView:[sender superview];
// gets the row corresponding to the converted point
NSIndexPath rowIndexPath = [self.tableView indexPathForRowAtPoint:originInTableView];
NSInteger section = [rowIndexPath section];
}
If I'm thinking clearly, this gives you flexibility in case the button's not directly inside the UITableView cell. Say, if you've nested inside some intermediary view.
Sadly, there doesn't seem to be an iOS equivalent of NSTableView's rowForView:
Create a handler for button click and add it in tableView:cellForRowAtIndexPath: method
- (void)buttonPressed:(UIButton *)button{
UITableViewCell *cell = button.superView.superView;
NSIndexPath *indexPath = [self.tableView indexPathForCell:cell];
//Now you have indexPath of the cell
//do your stuff here
}
When you create your custom UITableViewCell in cellForRowAtIndexPath you should pass it its section as a parameter. It could look like:
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
MyCustomCell *cell = [tableView dequeueReusableCellWithIdentifier:#"MyIdentifier"];
if (!cell)
{
cell = [[[MyCustomCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:#"MyIdentifier" section:indexPath.section] autorelease];
}
return cell;
}
Now your cell knows its section and you can use it when performing click method in MyCustomCell class
Try this,
First assign section as a tag to button also add target on button in cellForRowAtIndexPath method.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
...
[cell.btnSample setTag:indexPath.section];
[cell.btnSample addTarget:self action:#selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];
...
}
Get Section as tag from sender of IBAction you defined (buttonClicked here).
-(IBAction)buttonClicked:(id)sender
{
NSLog(#"Section: %d",[sender tag]);
}
I have set up a tableview using custom cells as such:-
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{SWHNearYouCell *cell = (SWHNearYouCell *)[tableView
dequeueReusableCellWithIdentifier:#"NearYouCell"];
SWHNearYou *aPointer = [self.thingsNearYou objectAtIndex:indexPath.row];
cell.customNearYouLabel.text = aPointer.restrauntsNearYou;
return cell;
}
I want to change the text of customNearYouLabel upon a button press but work out how to get a pointer to the cell in my -IBAction method.
Thanks
You can just handle that in your tableView:didSelectRowAtIndexPath: method by grabbing the cell.
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
cell.customNearYouLabel.text = #"New Text";
}
I presume the button is not on a table cell?
If so, you just need to update the relevant value in the self.thingsNearYou array.
If you then call [tableView reloadData] then the table will reload it's data and the text of customNearYouLabel will change.
Worked it out - needed to add in self before tableview
-(IBAction)cancel:(id)sender{
SWHNearYouCell *cell = (SWHNearYouCell *)[self.tableView
dequeueReusableCellWithIdentifier:#"NearYouCell"];
cell.customNearYouLabel.text = #"New Text";
NSLog(#"This is it: %#",cell.customNearYouLabel.text);
}
I'll need to spend some more time on it as [self.tableView reloadData]; will not update the table but I reckon that should be easier to solve.
I want to change text of custom UITableviewCell text on didSelectRowAtIndexPath and I am using following code:-
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
cell.lblName.text=#"cambridge";
[tableView deselectRowAtIndexPath:indexPath animated:NO];
}
but I am getting "request for member 'levelNo' in something not a structure or union". However I am able to set it at cellForRowAtIndexPath.
Please help
try
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
YourCustomCell *cell = (YourCustomCell*)[tableView cellForRowAtIndexPath:indexPath];
cell.lblName.text=#"cambridge";
[tableView deselectRowAtIndexPath:indexPath animated:NO];
//update your data, your data source must be mutable
//in case your array content are NSString, just do
[yourMutableArrayDataSource replaceObjectAtIndex:indexPath.row withObject:#"cambridge"];
//or if your data array holds NSDictionary. you can just initialize new dictionary
//as a replacement of the object in case you dont want your dictionary to be mutable
NSDictionary *tempDict = [NSDictionary dictionaryWithObjectsAndKeys:#"cambridge",#"text",#"yourOtherData",#"otherData" nil];
[yourMutableArrayDataSource replaceObjectAtIndex:indexPath.row withObject:tempDict];
}
as mentioned by Maulik (thank you), the lblName text will change back to its original text when the cell scrolls. you might want to update your data source to keep the new data. **answer edited
(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = (UITableViewCell *)[tableView cellForRowAtIndexPath:indexPath];
cell.lblName.text=#"New text Here";
[tableView deselectRowAtIndexPath:indexPath animated:NO];
[tableView reloadData];
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
YourCustomCell *cell = (YourCustomCell*)[tableView cellForRowAtIndexPath:indexPath];
cell.lblName.text=#"cambridge";
[tableView deselectRowAtIndexPath:indexPath animated:NO];
}
By above code of janusfidel , label's text will be changed. But when you scroll the table , I guess value will be changed to original value.
You also need to update your data source(that is your array ) when you want to change original data.
I have been trying to figure out how to set the accessoryType to UITableViewCellAccessoryCheckmark when the cell is selected but am having trouble finding a decent example of this.
If you know how to do this or a good tutorial could you please let me know that would be great.
To restrict the user to just one selection, meaning to create an exclusive list of one choice only, you could follow these steps;
Firstly, have a global index path declared in your .h file to keep track of the already selected cell ->
NSIndexPath *oldIndexPath;
When you create the cells, be sure to set the accessory type to none, so that no cell is selected by default when the table is seen;
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"CellIdentifier"];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:#"CallIdentifier"];
cell.accessoryType = UITableViewCellAccessoryNone;
}
return cell;
}
Finally, in the didSelectRowAtIndexPath delegate method, add the following code which will remove the checkmark from the already selected cell, and add a checkmark to the newly selected one.
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
if (oldIndexPath==nil) { // No selection made yet
oldIndexPath=indexPath;
[cell setAccessoryType:UITableViewCellAccessoryCheckmark];
}
else {
UITableViewCell *formerSelectedcell = [tableView cellForRowAtIndexPath:oldIndexPath]; // finding the already selected cell
[formerSelectedcell setAccessoryType:UITableViewCellAccessoryNone];
[cell setAccessoryType:UITableViewCellAccessoryCheckmark]; // 'select' the new cell
oldIndexPath=indexPath;
}
}
Hope this works out! :)
Something like this may work:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell = [self tableView:myTableView cellForRowAtIndexPath:indexPath];
[cell setAccessoryType:UITableViewCellAccessoryCheckmark];
}
To answer the comment below, just push a viewController in the same method like this:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell = [self tableView:myTableView cellForRowAtIndexPath:indexPath];
[cell setAccessoryType:UITableViewCellAccessoryCheckmark];
// Then push a new view
iPhoneCustomViewController *myVC = [[iPhoneCustomViewController alloc] initWithNibName:#"iPhoneCustomViewController" bundle:nil];
[self.navigationController pushViewController:myVC animated:YES];
[myVC release];
// And deselect the row (if desired)
[tableView deselectRowAtIndexPath:indexPath animated:YES];
}
Did you know that:
1.) UITableView keeps track of the index paths for the rows that have been selected? It's in an array called indexPathsForSelectedRows
2.) UITableView has a flag you can set to make it either single or multiple selection. You can change it by calling the setter setAllowsMultipleSelection:(BOOL).
So, assuming that the table has been set to single selection, we can do the following in the tableView:CellForRowAtIndexPath method ...
-(UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
static NSString *simpleTableIdentifier = #"CellIdentifier";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:simpleTableIdentifier];
}
[cell setSelectionStyle:UITableViewCellSelectionStyleNone];
[[cell textLabel] setText:#"Some Text"];
NSArray *selectedIndexPaths = [tableView indexPathsForSelectedRows];
if ([selectedIndexPaths containsObject:indexPath]) {
[cell setAccessoryType:UITableViewCellAccessoryCheckmark];
}else{
[cell setAccessoryType:UITableViewCellAccessoryNone];
}
return cell;}
This implementation of CellForRowAtIndexPath will give you a clean checkmark with no gray background when a cell is selected. You will need to set the checkmark in the didSelectRowAtIndexPath delegate method to make sure a cell gets the checkmark the moment it gets selected.
No need to create separate ivars or anything else to keep track of what was or wasn't selected. It's all neatly contained in the UITableView as Apple intended.
UITableViewCell *newCell = [tableView cellForRowAtIndexPath:indexPath];
newCell.accessoryType=UITableViewCellAccessoryCheckmark;
Implement this in didSelectRowAtIndexPath delegate method
From the docs:
The delegate handles selections in this method. One of the things it
can do is exclusively assign the check-mark image
(UITableViewCellAccessoryCheckmark) to one row in a section
(radio-list style). This method isn’t called when the editing property
of the table is set to YES (that is, the table view is in editing
mode). See "Managing Selections" in Table View Programming Guide for
iOS for further information (and code examples) related to this
method.
Here is an example:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath]
cell.UITableViewAccessoryType = UITableViewCellAccessoryCheckmark;
}
The code below seems to have no effect. I want it to be highlighed in the same way it highlights when you tap on a row
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
...
[cell.textLabel setHighlighted:YES];
return cell;
}
This line will handle repainting the cell, label and accessory for you:
[tableView selectRowAtIndexPath:indexPath animated:NO scrollPosition:UITableViewScrollPositionNone];
As others have noted, you can programmatically select a cell using this method:
[tableView selectRowAtIndexPath:indexPath animated:NO scrollPosition:UITableViewScrollPositionNone];
However, you should be careful not to call this method too soon.
The first time that the view controller containing said tableView is initialized, the earliest that you should call this method is within viewDidAppear:.
So, you should do something like this:
- (void)viewDidAppear:(BOOL)animated
{
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:0]; // set to whatever you want to be selected first
[tableView selectRowAtIndexPath:indexPath animated:NO scrollPosition:UITableViewScrollPositionNone];
}
If you try putting this call into viewDidLoad, viewWillAppear:, or any other early view lifecycle calls, it will likely not work or have odd results (such as scrolling to the correct position but not selecting the cell).
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:1 inSection: 0];
[tableView selectRowAtIndexPath:indexPath animated:NO scrollPosition:UITableViewScrollPositionNone];
usually works
If you are using interface builder to build your interface, one thing to check is that you specified the view of the table view controller. If you don't actually specify the view, this selection message may go nowhere.
(you specify the view by selecting the table view controller in the interface builder inspector window and dragging the outlet for "view" to the table view you want to do the selection in).
- (BOOL)tableView:(UITableView *)tableView shouldHighlightRowAtIndexPath:(NSIndexPath *)indexPath {
return YES;
}
- (void)tableView:(UITableView *)tableView didHighlightRowAtIndexPath:(NSIndexPath *)indexPath {
// do something here
}
Try this :)
You can use
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
...
[cell.textLabel setHighlighted:YES];
return cell;
}
You have two choices. Either use the selection of the table view:
[tableView selectRowAtIndexPath: indexPath animated: YES scrollPosition: UITableViewScrollPositionNone];
Or change the background color of the table cell in the table view delegate:
- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath {
cell.backgroundColor = ...
}