I got an app with a UITTableView. This table is updatable. And when in the next update the number of rows are less than in previous version, i implement the UITableView's method - deleteRowsAtIndexPaths.
I do it in this way:
[table beginUpdates];
[table deleteRowsAtIndexPaths:indexPaths withRowAnimation:UITableViewRowAnimationNone];
[table reloadRowsAtIndexPaths:indexPathsReload withRowAnimation:UITableViewRowAnimationNone];
[table endUpdates];
But when i implement this code there are animations. And this animation is really bad. A lot of black leaks. But i did write - withRowAnimation:UITableViewRowAnimationNone in both methods: delete and reload.
Why? How can i reload and delete rows without animation?
Usually the way this is done is by modifying the data source of the table, and calling reloadData on the table.
maybe you try to work with NSMutableArray (delete row by removeObjectAtIndex:indexPath.row) in TableView and reload the whole tableview by using [tableView reloadData] ?
You can try to make that "gesture" out of the table,and try reload table
Unlike what the name suggests *UITableViewRowAnimationNone* doesn't help at all.
Maybe setting the alpha on the cell works as suggested here. Not sure though.
problems with animation when deleting the last row of a TableView in ios7
Related
I had an application in which i want to scrolltoindexpath to a particular section. I am doing like this
[table scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:anIndex] atScrollPosition:UITableViewScrollPositionTop animated:NO];
[table reloadData];
all working fine.but here the issue is tableview always kept to the bottom .
it won't scroll up after that.it will always keeping the last cell to the bottom.not scrolling up after that.I set the constraints as (0,0,0,0).
I think i miss something here .Can anybody guide me on this?
There are mainly 2 issues here.
1)
[table scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:anIndex] atScrollPosition:UITableViewScrollPositionTop animated:NO];
With animated false, you have to forcefully call dispatch_get_main_queue() even if it's running on main thread. This is supposedly an iOS bug.
2) When you are trying to scroll the tableView, it calls cellForRowAtIndexPath for the available cells. However the immediate next line is calling reloadData which tries to call the same dataSource method. So it might be conflicting with others. So I would recommend adding a small delay for [table reloadData];
I have an accordion type of UITableView that works but I just need to adjust the animation slightly. When a row is clicked a method is called that deletes the rows that are showing then adds the new rows to show. I don't want to animate the rows being deleted. I only want to animate the part when the rows are being added. I can use [UIView setAnimationsEnabled:NO]; to turn off the animation all together but I just want to turn it off for the deleting part.
[self.unitListTableView beginUpdates];
[self.unitListTableView deleteRowsAtIndexPaths:delete withRowAnimation:UITableViewRowAnimationTop];
[self.unitListTableView insertRowsAtIndexPaths:added withRowAnimation:UITableViewRowAnimationFade];
[self.unitListTableView endUpdates];
Any help appreciated.
Call reloadData on your table view and it updates without any animation.
I need a text view inside of a resizable cell - the cell is resizing in real time, based on a specific timer/stopwatch. I can't simply put the text view inside the cell, because I'm resizing rows with reloadRowsAtIndexPath: every 10ms and that's causing the UITextView to resign first responder. I am trying to avoid calling becomeFirstResponder every time so what I did now was that I created an external text view and added it on top of the table view, so it basically only acts as if it was inside the cell.
Do you have any suggestions how else I could do this in a less hackish way?
Thanks, guys!
You shouldn't reload the table (contents) to resize. Just use:
[tableView beginUpdates];
[tableView endUpdates];
This will resize the cells but not reload the cells itself, so it should not resign the first repsonder.
[tableView beginUpdates];
[tableView endUpdates];
Call these methods if you want to perform operations simultaneously.
beginUpdates and endUpdates should be nested properly within the codes. These are the efficient methods that has been provided to us.
I'm using a UITableViewController, and am using:
[self.tableView reloadSections:[NSIndexSet indexSetWithIndex:sectionNumber] withRowAnimation:UITableViewRowAnimationNone];
to reload an individual section of the tableview (to animate the insertion of new cells). The issue is that all of the sections, and their cells, flash white briefly every time this call is made. This does not occur if I use
[self.tableview reloadData];
but does occur no matter which row animation I use.
I'm aware that I can use insertRowsAtIndexPaths:withRowAnimation:, but I currently have a race condition that doesn't allow me to use that. I will, at some point, fix that, but in the meantime I would like to know why all sections cells flash while I'm reloading a single section. In addition, if I can turn off the flash and just animate the insertion / deletion of cells, that would be ideal.
I believe that it flashes because when you reload a specific section, it still has to recalculate the size of all the visible sections. Hence the flash. Without using insertion/deletion (because it knows the table will only change by one), you can't get past that.
If you are just trying this in the simulator though, it is possible that the flash will either disappear or be less noticeable when loaded on an actual device.
May be it's too late. But it could help someone.
Obj-c:
[UIView performWithoutAnimation:^{
[self.tableView reloadSections:[NSIndexSet indexSetWithIndex:[indexPath section]] withRowAnimation:UITableViewRowAnimationNone];
}];
Swift 5:
UIView.performWithoutAnimation {
self.tableView.reloadSections(NSIndexSet(index: indexPath.section), with: .none)
}
I've found similar question, but there is no answer (sorry, answer just doesn't work).
So I have grouped table and I want to animate content update instead of doing [tableView reloadData].
I do that by using this piece of code:
// Data source already updated here, but reloadData wasn't called
[self.tableView beginUpdates];
[self.tableView reloadSections:[NSIndexSet indexSetWithIndex:0] withRowAnimation:UITableViewRowAnimationMiddle];
[self.tableView endUpdates];
I uploaded 2 examples of the animation:
Plain: http://cl.ly/3u1M3l1w3V3J (slow motion)
Grouped: http://cl.ly/1O3Z2M280n0z (slow motion)
As you can see difference is huge.
I don't change my code at all, just change tableView style in the storyboard.
Does it men that there is no other way then subclassing UITableView and UITableViewCell and implement my very own animation using CoreAnimation?
Implementing your own animation with CoreAnimation shouldn't be necessary when it comes to animating the rows of the table.
UITableView supports much more advanced animations than simply reloading a section and I suggest that you take a look at them.
Since you are shuffling the rows in your videos you should take a look at moveRowAtIndexPath:toIndexPath: (on UITableView). You put the calls to it within beginUpdates and endUpdates.
By knowing the order before and after the re-shuffle you can move all the rows into their new places and have them slide into their correct place.
It will take some thinking to figure out where each row should go but it will be much easier than rolling your completely custom solution.