I have following issue: I have a UITableView.If you click on a cell, a button is added on cell. No Problem till now... but: After adding button i want the TableView (after its reload) to select the just edited (or added) TableCell.
I've tried this in cellForRowAtIndexPath method
if (bool) {
[cell setSelected:YES animated:YES];
}
UIView *bgColorView = [[UIView alloc] init];
[bgColorView setBackgroundColor:[UIColor colorWithRed:34/255.0 green:139/255.0 blue:34/255.0 alpha:1.0]];
[cell setSelectedBackgroundView:bgColorView];
[bgColorView release];
return cell;
But it didn't work.
Any suggestion or sample code would be appreciated. Thanks .
For the standard selection you use the following method, described at UITableView reference docs
- (void)selectRowAtIndexPath:(NSIndexPath *)indexPath animated:(BOOL)animated scrollPosition:(UITableViewScrollPosition)scrollPosition
Your design might be improved if you use the custom cell storing information of selection count, that is much better than reloading the table and adding a lot of cell logic outside of the cell.
Why are you using
[tableView reloadData];
You can access the selected cell properties and controls without reloading the data using:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath;
Here is some code that can help you:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
CustomTableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
[cell.myButton setHidden:false];
}
Related
I ran into some strange behaviour after I selected a cell using this code :
NSIndexPath * indexPath = [NSIndexPath indexPathForRow:1 inSection:0];
CustomCell * cell = (CustomCell*)[_myTableView cellForRowAtIndexPath:indexPath];
[cell setSelected:YES animated:NO];
After this i couldn't select exactly this cell it just didn't respond and
-(void)tableView:(UITableView *)tableView didDeselectRowAtIndexPath:(NSIndexPath *)indexPath
was never called.
This wasn't called either:
-(void)tableView: (UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
What i am doing wrong guys?
You need to call both methods manually because manually cell selection does not call delegate method.
[cell setSelected:YES animated:NO];
[self tableView:_myTableView didSelectRowAtIndexPath:indexPath];
According to Apple's documentation it is expected behavior that the methods you mention are never called after programmatically selecting a cell. More info is in this post.
My project is a large one, and I'm not sure which code snippet is causing the problem, so I'll just describe the problem. I have an initial view that is a UITableView. This view has a navigation bar, in which one of the buttons is an "edit" button. Pressing the "edit" button sends you into a modal view controller in which there is another UITableView. This UITableView has the attribute that it is a checklist table view (in which multiple items can be selected [checked] or deselected. Once you are finished choosing your items, it saves the array of chosen objects into an NSUserDefault. Now, you are back at the original page where the array of things you chose should be displayed on the UITableView. I change the array that is feeding the UITableView it's data to the array grabbed from the NSUserDefaults. I then call [tableView reloadData] and nothing changes. I would really appreciate any tips. If you guys think you know what part of the code is causing me grief, please respond and I'll post it. Thanks (and by the way, I know I should be making the main view controller the delegate of modal view controllers). Thanks in advance.
Call [[NSUserDefaults standardUserDefaults] synchronize]; after you make changes in the modal view controller. This will save the changes.
Be sure to update the cell content each time the table row is reloaded.
- (void)configureCell:(UITableViewCell *)cell atIndexPath:(NSIndexPath *)indexPath
{
Bleh *data = (Get your data for this row);
cell.textLabel.text = data.myValue;
cell.imageView.image = data.myImage;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:CellIdentifier];
}
[self configureCell:cell atIndexPath:indexPath];
return cell;
}
Try to reload your tableview on viewwillappear , when you back from modelviewcontroller method calls
- (void)viewWillAppear:(BOOL)animated{
[yourTableView reloadData];
}
Currently my tableview looks like this: as you can see, cell.textLabel and cell.detailTextLable both load this background, and i can't work out how to get them to stop loading the background, and for it only to be the backing on the cell.
Here's my current code to change the cell:
- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath {
[cell setBackgroundColor:[UIColor colorWithPatternImage:[UIImage imageNamed:#"tableCell.png"]]];
}
How can i get round this problem?
Thanks in advance.
have you tried [[cell contentView] setBackgroundColor:blabla]; ?
I am using XCode4.2 to develop a storyboard application
I am switching views based on a click in a UITableView after clicking the row is highlighted in blue and the new view is loaded .
when I come back to the original view the row is still highlighted in blue ... how can I disable that ?
I do this in
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
[tableView deselectRowAtIndexPath:indexPath];
}
That way I have the index path that was selected every time.
use deselectRowAtIndexPath:(NSIndexPath *)indexPath animated:(BOOL)animated function to deselect rows in uitableview
call it in your viewWillAppear function
[yourTableView deselectRowAtIndexPath:selectedIndexPath animated:NO];
if you are not sure which is index you select last time you can run a loop on all the index path in your table.
-(void) viewWillAppear:(BOOL)animated{
[super viewWillAppear:animated];
for(int i = 0; i <= [yourArr count]; i++)
{
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:i inSection:0];
[yourTableView deselectRowAtIndexPath:indexPath animated:NO];
}
}
Note: As I don't know your exact code....you need to modify above code to your needs.
A UITableViewController does this automatically. Otherwise, in your viewDidAppear for the owning controller, you need to call - (void)deselectRowAtIndexPath:(NSIndexPath *)indexPath animated:(BOOL)animated on the table view.
I have a couple of rows in a table view which I like to edit.
I thought that setEditing method would give me a Edit and Delete button, but it only shows a Delete button. Because I don't have a detail view controller that's going to be pushed in didSelectRowAtIndexPath I thought I could show a couple of editing elements in the selected cell.
I need to add three buttons to specify priority on assignments: Low, High and Medium priority. This means that I have to change the height of the selected cell to make room for these buttons, I think that's rather easy to do.
What I'm wondering is if this is the correct path to choose?
I have done quite a lot research today without finding examples of how other have solved editing in a UITableViewCell. If you edit a contact in the Contacts app in the iPhone the UITableViewCells changes to enable quick and easy editing, that's what I'm looking for.
So what do you have for tips for me regarding this question?
Edit #1
My code in didSelectRowAtIndexPath is:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
Cell *selectedCell = (Cell *)[tableView cellForRowAtIndexPath: indexPath];
UIButton *btn = [UIButton buttonWithType: UIButtonTypeRoundedRect];
btn.frame = CGRectMake(0, 0, 50, 100);
btn.titleLabel.text = #"Set this item to High Priority";
btn.backgroundColor = [UIColor greenColor];
[selectedCell.contentView addSubview: btn];
self.editing = YES;
[tableView reloadRowsAtIndexPaths:[NSArray arrayWithObject: indexPath] withRowAnimation:UITableViewRowAnimationFade];
}
Code for heightForRowAtIndexPath:
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
Cell *cell = nil;
if (self.editing)
cell = (Cell *)[tableView cellForRowAtIndexPath: indexPath];
else
cell = nil;
BOOL expandCell = NO;
NSInteger expandationHeight = 0;
if (cell != nil)
{
for (UIButton *btn in cell.contentView.subviews)
{
NSLog(#"A button was found.");
expandationHeight = 70;
expandCell = YES;
}
}
return expandationHeight + heightOfOtherElements;
}
When I click at a cell nothing happends but everything becomes disabled, I can't click any elements on the hole view. This has something to do with [tableView cellForRowAtIndexPath: indexPath], because if I uncomment that line the UI does not become disabled.
What am I doing wrong?
That's not too complicated though it requires some stuff.
You want to change the content of one cell or of all cells?
To specify a specific height for one cell, use the - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath delegate method.
It is called for each cell each time the table view is displayed. If you want to change a single row, call reloadRowsAtIndexPaths:withRowAnimation: method from UITableView. If you want to update all cells, simply use - (void)reloadData method.
You can also access a specific cell using - (UITableViewCell *)cellForRowAtIndexPath:(NSIndexPath *)indexPath method from UITableView. Then you can reconfigure it to add various elements on it, as you want.
Thus, when a cell is selected, check whether you have to edit it or not, then :
update your cell get from cellForRowAtIndexPath
be sure your method tableView:heightForRowAtIndexPath: will return the good height
tell the table view to update the view using reloadRowsAtIndexPaths:withRowAnimation: