I am new to the iPhone development. I got stuck with a problem. I want a check box function implemented in my UITableView. But my UITableViewCells are custom cell which consist of image and 3 UILabels. I could bring a sub view to the table view so that check box image can placed and I am successful in that. But the problem comes is whenever I click on the image only the last cell check box get changed. I would like to access the cell which I've clicked.
I have tried this
UITableViewCell *cell = [self cellForRowAtIndexPath:indexPath]
But this crashes since cell is custom.
Can any one suggest me a good method to do that?
Instead of using
UITableViewCell *cell = [self cellForRowAtIndexPath:indexPath]
try using
YourCustomCell *cell = (YourCustomCell *)[self.tableView cellForRowAtIndexPath:indexPath];
Hope it helps
First of all you need to define a tag -
#pragma imageViewTag 1
then in your cellForRowAtIndexPath assign this tag to your image view
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
then you can access your image view any where with the help of this tag as -
UITableViewCell *cellView = (UITableViewCell*) [tblView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:1 inSection:0]];
UIImageView *imgView = (UIImageView*) [cellView viewWithTag:imageViewTag];
In your TableView DidSelect Delegate method
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
UIImageView *image = [cell.contentView viewWithTag:15];
//You should have set the tag value as 15 when creating the image in cell
//and you should have added to the cell contentview
}
If you cant able to get the cell then probably you wouldnt have used the reusable cell concept correctly. So post your entire cellforrowindex code.
If you are using the check kind of thing. Why dont you use the default disclosure indicator of tableview instead of your image.
Related
I have a custom Cell for my TableView, with an ImageView on it.
Why is the ImageView only visible when the cell is highlighted?
The cells are created thusly:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"Cell"];
Site *site = [self.dataController objectInListAtIndex:indexPath.row];
[[cell textLabel] setText:site.description];
return cell;
}
Check out: Custom UITableViewCell (IB) only shows in selected state
The quick synopsis of it "Filling the standard UITableViewCell.textLabel.text seems to overwrite the PrototypeCells". So it would appear you have to create and add a different text label.
Maybe your UIImageView is a subview of the highlighted background view, only visible when the cell is selected?
I have a UITableView, and in the tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath, I want to be able to access the frame that the selected cell is in. Here is what I was trying:
UIView *cell = tableView.indexPathForSelectedRow;
UITableViewCell *cell = (UITableViewCell *)indexPath;
I want to be able to access the view that the selected cell is in.
thanks in advance.
To do this, use:
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
than you can access all the info on cell as you would any other UIView
ie. cell.frame, cell.bound, etc.
Accessing the cell directly isn’t necessary—yes, you can get the cell and its frame via -cellForRowAtIndexPath:, but you’d then have to subtract the content offset of the UIScrollView (which UITableView subclasses from) to get the cell’s actual position within the boundaries of the table view. The best approach for this is the UITableView method -rectForRowAtIndexPath:.
I have no idea how to do this. I have a tableview on firstview with some labels. And they have a disclosure button I want to obtain the data from the labels and show them in secondview in other labels.
How to do it please?
Thank you
To get the selected cell you have to implement:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
YourCellType *cell = [self tableView:tableView cellForRowAtIndexPath:indexPath];
}
YourCellType is an UITableViewCell subclass having the desired parameters (UILabel, UIImageView, etc.).
So if you have a UILabel *label1 in cell, you can access it by:
cell.label1
Hope this helps
Ive added a uiimageview as a subview to my cell.and then put a label on top of it so that it would seem like a button.But whwn the table is scrolled up or down the image seems to get painted again.This turns extremely ugly as my image has transparency effect which is lost as soon as it goes out of view and comes back.???
Ok, I'll try to guess what your code looks like :)
If images are painted multiple times that means you add them each time table view queries data source for a cell:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell = [tableView #"SomeID"];
if (cell == nil) {
// Create cell
}
UIImageView *imView = ... //Create and initialize view
[cell.contentView addSubview:imView];
...
return cell;
}
So each time your cell appears on screen (after user scrolls the table) new instance of image view is added to the cell. The correct approach is to add image view only once - when cell is created and then obtain and setup the existing image view:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell = [tableView #"SomeID"];
if (cell == nil) {
// Create cell
UIImageView *imView = ... //Create and initialize view
imView.tag = 1000; // or any other int value
[cell.contentView addSubview:imView];
}
UIImageView *iView = (UIImageView *)[cell.contentView viewWithTag:1000];
iView.image = ...// set required image
...
return cell;
}
So with this approach each time the cell is reused by table view the existing image view is populated with the image appropriate for the current row.
I used a seperate identifier for each cell.
Usually it is not a good idea - in this case table won't be able to reuse its cells and you may get serious performance troubles
I want to change the textLabel and detailTextLabel of a cell when it has been selected.
I've tried the following, but no change occurs:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
MyAppDelegate *appDelegate = (MyPhoneAppDelegate*)[[UIApplication sharedApplication] delegate];
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
cell.detailTextLabel.text = #"xxxxx";
cell.textLabel.text = #"zzzzz";
[tableView reloadData];
}
I agree, reloading the table view will actually dump and reload/display all the cells using tableView:cellForRowAtIndexPath: and use the original data, not the updated #"xxxxx" and #"yyyyy" in your tableView:didSelectRowAtIndexPath: method.
In a little test project I was able to change the labels upon selection with:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell * cell = [tableView cellForRowAtIndexPath:indexPath];
cell.textLabel.text = #"it was tapped";
}
You should not be trying to reload the table while a cell is selected. Instead, try
[cell setNeedsLayout]
after you make the above changes to the labels.
Also, is there a reason you're making a reference to the app delegate in the method?
Try to reload the cell you selected (described by indexPath) :
[yourTableView reloadRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationNone];
Create a New iPad Project (Split View) and Now go through the Classes->Files. The easiest way's been given there. The XCode's Generated Codes.
Sample Code Lines :-
cell.textLabel.text = [NSString stringWithFormat:#"Row %d", indexPath.row];
You can use them in cellForRowAtIndexPath ||&& didSelectRowAtIndexPath ..
Not sure what you're trying to do with the delegate but you should try calling the tableView already instantiated; i.e. call
UITableViewCell *cell = [self.tableView cellForRowAtIndexPath: indexPath];
Maybe I'm not clear
What I'm saying is that you are instantiating a new empty table view
UITableViewCell *cell = [**tableView** cellForRowAtIndexPath: indexPath]; //cell has nothing it is new.
consider replacing to call the old
UITableViewCell *cell = [**self.tableView** cellForRowAtIndexPath: indexPath]; //now you have one that has a textField already in it
Did you try to refresh only the selected cell instead of reloading the whole table ?
[cell setNeedsDisplay];
instead of
[tableView reloadData];
This will have better performance and I'm not but I suppose that selection is lost if you refresh the whole table (this may be the reason why you don't see any change in the end)....