I am new to iOS programming
I would like to Save the Selected Cell (cell.detailTextLabel.text) to another Textfield outside of table view in the same viewController .
Can anyone suggest me how?
Use this delegate method of the table view,
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
selectedLabelName = cell.textLabel.text;
}
declare variable name selectedLabelName in your viewcontroller
Related
I an doing a table view cell auto selecting for the first time by using
[cell setSelected:YES animated:YES];
It select the cell programmatically for the first time. It works fine. Now I want to deselect that cell when i select another cell in the meantime. how can i do that. I know when i select a cell then tableview delegate method
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
is called and when deselect a cell then "did deselect row at index path" is called.
But the problem is i select the cell programmatically and when i select another cell then delegate method
-(void)tableView:(UITableView *)tableView didDeselectRowAtIndexPath:(NSIndexPath *)indexPath
doesn't call.
What should i do to solve this problem or what will be the logic to solve that problem?
Instead of calling setSelected:animated: on the cell directly, call the selectRowAtIndexPath:animated:scrollPosition: method of the table view to set the initial selection.
You can use below method to deselect row:
[tableView deselectRowAtIndexPath:indexPath animated:YES];
You just need to stored index when it's selected. So you just need to check if you have selected indexpath then make it deselect.
Take an object of NSIndexPath:
NSIndexPath *currentSelectedPath;
Update your didSelectRow method:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
if(currentSelectedPath)
{
[tableView deselectRowAtIndexPath:currentSelectedPath animated:YES];
}
currentSelectedPath = indexPath;
// Do your other stuff
}
I am working with tableviews in iOS. Reusable cells are reloaded when scrolling.
So, when updating -for example- textfields inside a cell, it disappears once scrolling over. I solved it by using an Array that saves all texts in all cells, but I wonder if there's a better way to solve this issue.
Thanks.
Using String array you have to store data of all textfields in tableview.
Use delegate methods of UITableView to implement more efficiently.
-(void)tableView:(UITableView *)tableView didEndDisplayingCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath {
MyCell * mc = (MyCell *) cell;
names[indexPath.row] = mc.myTf.text;
}
- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath {
MyCell * mc = (MyCell *) cell;
mc.myTf.text = names[indexPath.row];
}
Here, MyCell is the custom cell which has UITextField. name[] is the NSString array declared at class scope like NSString * names[20].
What you are describing is how tableviews are meant to work! The tableView is a display, not a store, and the reusable cells are only those currently displayed
You are right to use an array (or collection) to hold the data and just use the tableView to display it
for memory management (to releasing memory) tableview remove cell memory which are not displaying in current screen its only keep those cell in memory which are currently displaying on screen so you have to store that text separate from tableview.
You issue can be because of multithreading. If you are reloading data from a GCD operation or any NSOperation(different thread), then you have to use the below code to get the handle to main thread
dispatch_sync(dispatch_get_main_queue(), ^{
//perform the reload activity
});
Yes you are doing right, as cells are reused you need to save your data, something like this -
1 . Have an array to hold your data.
2 . Update your array whenever you make any change in your textFields, so that your UI and data are in sync.
Use this array to populate your tableView.
You need to define the cellIdentifier as unique. Then each cell created with unique identifier.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSString *CellIdentifier = [NSString stringWithFormat:#"Cell%dR%d",indexPath.section,indexPath.row];
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if(cell == nil)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:CellIdentifier];
//your logic here
}
return cell;
}
I have custom cell called MyCustomCell, there is a label named pushLabel, in table view I get parameters of label like this:
cell.pushLabel.text = #"text";
I need to get in that label parameters in viewDidLoad (where table view is located), how this can be done?
In viewDidLoad method, UITableView still should have not been loaded so there no way you can get UITableViewCell objects.
One solution can be, maintain flag say you have
//Add in your .h file
BOOL hidePushLabel;
Now use these flag to hide intially in tableview like this:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSString *strCellIndentifier = #"cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:strCellIndentifier];
if (cell)
{
//By default hidePushLabel will be NO so hide pushLabel
if(!hidePushLabel)
cell.pushLabel.hidden = YES;
else
cell.pushLabel.hidden = NO;
}
return cell;
}
I have a tableView that I have set allowsMultipleSelection to YES in storyboard.
EDIT
I was wrong about one thing... [tableView indexPathsForSelectedRows] does return a NSArray with 1 object in it during didSelectRowAtIndexPath.
However it does not work in cellForRowAtIndexPath after I reload the table so it will check which accessory (check mark or not) to apply.
In the original question I was trying to manually select the rows... Apparently that is handled by the tableView itself.. but somewhere along the way it is automatically deselecting my row as I never call deselectRowAtIndexPath on it...
Original Question:
For some reason when I set the cell to selected it does not change.
- (void)tableView:(UITableView *)tableView
didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
//cell does not update selected property to YES after this next line
cell.selected = YES;
[tableView reloadRowsAtIndexPaths:[NSArray arrayWithObject:indexPath]
withRowAnimation:UITableViewRowAnimationFade];
}
I suppose I can keep track of the selected index paths myself... but I can swear I used a method that involved indexPathsForSelectedRows previously with success...
You cannot set the selected property directly
So instead of
cell.selected = YES;
Use
[tableView selectRowAtIndexPath:TheIndexPAth animated:YES scrollPosition:UITableViewScrollPositionBottom];
please post your all codes for this class in pastbean and put your link here we need more information,
and also try:
//in your interface
#interface YourClass (){
NSInteger _selectedIndex;
}
// cellForRowAtIndexPath: method
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath
*)indexPath
{
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
// didSelectRowAtIndexPath: method
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
_selectedIndex = indexPath.row;
[self.tableView reloadData];
}
Try [cell setSelected:YES animated:YES]
I'm pretty sure cell.selected is read only
A bit unfair since the question changed but.. for me.. the answer is either don't use
indexPathsForSelectedRows
or don't call
reloadTable
on your tableView.
I opted for the later, I decorated the accessory in didSelectRow and didDeselectRow instead of doing it on reload and just never reloading the table.
If someone can come up with a solution that involves both of the above, I will select that answer instead.
this is Nsr (just a beginner in xcoding), using xcode 4.3.3,
I've made a Custom UITableview with Custom UITableviewcell through storyboarding,
I have a UIBUtton and a UILabel in my custom cell.
i'v remove the cell selection (also cleared the background) so that only the buttons can be accessable which works as a backgound for the custom UILabel.
Now there are bunch of buttons since of using data array, and when i click any button, it segues to the other view (detail view), all i wanted is to set the custom Label (set over the detail view) from the previous selected button with "Label"...
means new Label = previous page's clicked Label from the custom tableview..
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
Custom *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[Custom alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
cell.myLabel.text = [myArray objectAtIndex:indexPath.row];
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
[tableView deselectRowAtIndexPath:indexPath animated:YES];
[self.myTable reloadData];
}
I hope you get my problem, very sorry for my poor english..
Please help me, im in a real mess, coz this problem already took my 3 days :(
Thanx in advance, Cheers.
function return Custom cell but in header you write UItableviewCell change this to Custom