My table view covers part of the view. If I have 20 objects, I am displaying all of them in a tableview. But I want to know that how many cell are loaded that are visible to the user.
(i.e. first 5 cells data is visible for me: when I scroll down, the remaining cells will load. Here I want to know without scrolling how many cell are loaded.)
Is this possible?
You can use [tableView visibleCells] count], which returns numbers of the table cells that are visible, if I understand correctly what you want.
The below code will give you the array of indexpath of cells currently visible
NSArray *visiblePaths = [self.tableView indexPathsForVisibleRows];
after getting the index path you can easily access the cell at a particular indexpath
Its usually : (tableView's height / cell row height ) + 1
Can you take the size of the visible part of the table, and then the size of one cell, and divide them to know how many of them fit in the screen?
Related
I am using a UITableView to display some items and i have implemented a UISearchBar to this UITableView.
If the user presses the cell, a checkmark appears (accessory type of the cell is changed) and when pressed again the checkmark accessory disappears.
My problem is when the user searches using the search bar, all the checked cells are not checked anymore, no more checked cells at all.
I've been trying to fix this and searching for it for a while but no results ...
Any help ??
Thanks you.
That is because your table view where you put the checkmarks and the table view that you see after you enter something in the search bar is not same. To have the same check marks on the search table view cells, you need to explicitly add the checkmarks.
I can't see the way you are adding and removing check marks. So, in theory, what you need is a way to know which cells have check marks. So, let's assume you have an array of items and a parallel array which holds the 1 or 0 to signal if the items have the check marks when 1 means check marked and 0 means no check mark.
Let's call this parallel array, checkMarkSignalArray. Now, in your cellForRowAtIndexPath method, you can do something like-
if(self.resultSearchController.active){
cell.textLabel.text = [self.filteredItemsArray objectAtIndex:indexPath.row];
if([self.checkMarkSignalArray objectAtIndex:indexPath.row]){
cell.accessoryType = UITableViewCellAccessoryCheckmark;
}
}
How to design this table view cell..
Cell overlaps the another cell.
Please help me
Set the y offset of the pictureImageview to be negative i.e -50.0f or so, the image will appear as starting from the cell above.
I just tried AppleDelegate's solution but didn't work, because the top of every image is cut, maybe because it is beyond the cells bounds, even with clear color for background.
A different approach would be to believe that it's just a visual effect, and cells are not overlapping. This is possible by giving a different height for every cell with next code :
- (CGFloat)tableView : (UITableView *) tableView
heightForRowAtIndexPath : (NSIndexPath *) indexPath {
// RETURN A DIFFERENT HEIGHT FOR EVERY CELL DEPENDING ON INDEXPATH,
// INCREASING IT GRADUALLY.
}
In the next image, the black lines look like cells' top border, but maybe that's the effect, and the real limit is the red line :
Thinking this way, only the first cell requires a special treatment for the green titles.
Try setting constraints in storyboard and then keep the UIImageView's size/frame of image same when the image is set to UIImageView. Good Luck!
i have the indexPath number... i need to remove the cell accessory from that cell based on the number in the variable i have?
NSInteger *removeAccessoryFrom = 3;
[studentTableView cellForRowAtIndexPath:removeAccessoryFrom].accessoryType = UITableViewCellAccessoryNone;
It doesn't work like that. You need to reload the table data (either for the whole table or for just this row) and, inside cellForRowAtIndexPath, set the accessoryType to UITableViewCellAccessoryNone conditionally. In other words, you keep a list, or have some other way of knowing, at every moment, and for the entire table, exactly what cells get exactly what accessory. That way, any time cellForRowAtIndexPath is called, you can configure this cell for this index path correctly.
I'm trying to programmatically select cells in a UICollection view. I'm new to Obj-C and I'm not quite sure how to use the selectItemAtIndexPath property. I can grab an array of the images the user has previously selected. It is just an array of numbers corresponding to named images. But I'm not sure how to use that information with selectItemAtIndexPath.
I've looked for examples of someone using
- (void)selectItemAtIndexPath:(NSIndexPath *)indexPath animated:(BOOL)animated scrollPosition:(UICollectionViewScrollPosition)scrollPosition
But I'm not sure how to use it with my UICollectionView so I can have the right cells selected when the view loads and thus be highlighted. I have multiple selection on.
You should call selectItemAtIndexPath: for each cell you want to highlight, like so:
[self.collectionView selectItemAtIndexPath:path animated:NO scrollPosition:UICollectionViewScrollPositionNone]
Note that for one item (and one only!) you probably want to set the animated property to YES and provide a scroll position (one item only because otherwise you're going to be making a lot of needless animation calls).
You'll first need to get the index paths of the cells you want to select. The index path consists of two numbers: the section the cell is in and the row number (or order, if your collection view doesn't have rows) of the cell inside that section.
If you store the index paths of the cells the user has selected in an array then you can just iterate through. Otherwise you'll need to find the index path out, using a UICollectionView method such as indexPathForCell.
Is there a way to move the highlighted tableviewcell programatically. If I wanted to highlight cell number 3 and then highlight cell number 4 instead, based on something the user did in the detail view of my split view controller, can I do this?
Is there a way I can get the indexpath for the row two below one that I have?
Thanks!
You can do this via the UITableView selectRowAtIndexPath:animated:scrollPosition: method.
In terms of getting the "next" row from the indexPath, you can simply use the indexPath.row property (as supplied from your UITableViewDelegate's tableView:didDeselectRowAtIndexPath: method) as the basis for the selected row.