I am beginner iphone developer I want created table in programatically. In the table we take more than 20 row. But i have some problem that after 11th row the same value repeated.
plz help me with code and other method
You may want to look at this question which is the same problem. In that case, the person was setting the text of the cell only when creating a new cell (when nil was returned from [tableView dequeueReusableCellWithIdentifier:].) It needs to be set every time the tableView:cellForRowAtIndexPath: is called.
when you use reuseIdentifyer, the new cell to display is the cell that has just disappeared. so it will contain all the data from the disappeared cell. for example, if the cell, that has just disappeared, has detailDisclosureIndicator, the new cell will have it too even you don't set it.
Related
This question already has answers here:
Accordion table cell - How to dynamically expand/contract uitableviewcell?
(5 answers)
Closed 6 years ago.
I am trying to recreate the collapsable date picker that the calendar app uses when creating a new event. I've put an example of what I'm trying to do on github
In short, I've created a static table, added three cells. The first cell is for the date, and contains a button to toggle the second cell. The second cell is the date picker. The third cell is arbitrary. In the code I'm trying to set the height of the table cell (and the date picker if needed) to zero, and then toggle the size whenever the user clicks the button. No matter what I've tried, I can't a) get the cell to collapse without some sort of gap, and 2) get the animation to smoothly transition from expanded to collapsed and back again.
Edit: This question is not the same as the duplicate answer, in that I wanted to expand a separate table cell and not the same cell as being selected. But, I personally can live with using a same-cell expansion. I also updated my github project so future people can see a working example.
It's very simple; you are probably over-thinking things here. This functionality is built in; Apple wants you to be able to expand and contract a cell. You just aren't using the API Apple has provided. Use it! Here's how.
The date picker cells are always present. But their height is zero (and their clipsToBounds is true) so you don't see them. So implement heightForRowAtIndexPath to return zero for those cells.
To show a date picker cell, change what heightForRowAtIndexPath returns (this is easiest if you have a property that holds this value, so you can just change the property value and have heightForRowAtIndexPath read it from there) and say:
self.tableView.beginUpdates()
self.tableView.endUpdates()
That's all there is to it!
Here's a quick demo I made. The red and orange things are cells. The table has three cells but the second one, containing the date picker, starts out with zero height:
I am unable to find a solution for this on my own, please help.
I have a table view with -/+ buttons inside that increase or decrease a value.
In the footer cell of the table is a label for the "total sum", the added value of all the cell values. When the value inside of a cell is decreased or increased, I want the footer cell text to change accordingly.
Any pointers how I go about that? I have tried to write a global function, but then I can't access the label anymore... tried it as a class method (static), but I can't seem to get it to work.
Can I somehow hook up the action that occurs in the UITableViewCell to trigger an action in the UITableView?
Thank you!
In the UITableViewDelegate associated to your table view, you should call the reloadRowsAtIndexPaths(indexPaths: [NSIndexPath], withRowAnimation animation: UITableViewRowAnimation) method to update your the row you wish to update.
Than it your UITableViewDataSource provide the footer cell with the good new value.
I have a nice bug here, specially in slow devices.
I have a UITableView jusk like the ones in the App Store app, with a Load More button at the bottom.
When it is pressed, I load the new info from the server, set the array, and reload the table view. In that info is also the url of the image for each object displayed in the table rows, so when we got it we start donwloading the image. When the image is loaded, I reload the row of the object.
[self.searchResultsTableView reloadRowsAtIndexPaths: [NSArray arrayWithObject: path] withRowAnimation: UITableViewRowAnimationNone];
The problem comes when the row is being reloading because the image was downloaded, and the whole table is doing so cause the user pressed the load more button and more info was gotten. Then I get this error:
Invalid update: invalid number of rows in section 0. The number of rows contained in an existing section after the update (140) must be equal to the number of rows contained in that section before the update (125), plus or minus the number of rows inserted or deleted from that section (1 inserted, 1 deleted).
Which is perfectly understable, the table was enlarged while the new image row was being updated.
My question is: how can lock it so I do not reload that row until the whole table is reloaded? It would nice something like table.isReloading. I try with a boolean lock, and doing both actions in the main thread, but it did not work ...
Thanks a lot.
Well, a little research in the doc put some more light in all this.
reloadRowsAtIndexPaths:withRowAnimation: Call this method if you want to alert the user that the value of a cell is changing. If, however, notifying the user is not important—that is, you just want to change the value that a cell is displaying—you can get the cell for a particular row and set its new value.
And that is what I did, I got the cell and set the new value for image, instead of reloading the whole of it. I guess it is more efficient also:
AHMyTableViewCell *cell = (AHMyTableViewCell *) [self.myTableView cellForRowAtIndexPath:path];
if ((cell != nil) && ([cell isKindOfClass:[AHMyTableViewCell class]]))
cell.myImageView.image = image;
It does not crash now.
I have a grouped UITableView, with cells in section 2 depending on cells in section 1. More precisely, each cell in section 1 is associated with multiple cells of section two and deleting a row in section 1 needs to delete the associated rows in section 2.
I have my dataSources all set up and everything works fine if all cells are visible. However, if the cells from section 2 haven't been loaded in the UITableView yet, I have a problem because the data source is updated for section 2 too.
I'm looking at this method visibleCells in UITableView. But I'm using custom UITableView cells and get an unrecognized selector exception if I try to access one of the labels in a cell.
How do I get around this?
Thanks,
Teja.
I believe what you were looking for is:
if ([tableView visibleCells] containsObject: theCellOfInterest]) {
// Do whatever you want to do.
}
Sorry if I wasn't clear the first time (or maybe even the second time too), but here's an answer to a repost of the same question.
Deleting multiple (not yet loaded) rows in UITableView
I am happily able to set the styling of my tableviewcells using the cellForRowAtIndexPath delegate, but I want to set the background of all the nonpopulated cells which are still on the screen
hey, basically any cell which is part of your tableview belongs to a particular index and particular row
so incase you are not populating a particular section via data source - you can still get a reference to a cell in that indexPath by manually calling the cellForRowAtIndexPath delegate, and passing the section as well as row index
it returns you a cell. assign it to your private variable and edit it the way you want to.
Use the visibleCells method on your table view. Then do what you wish to the cells.
Alternately, you could call indexPathsForVisibleRows to get just the index paths. Then call cellForRowAtIndexPath: to get the cell corresponding to each index path.