Perform UICollectionView reloadData without animation - ios

I have UICollectionView cells with a rounded button inside, when I perform reloadData every rounded button goes from the left to the right. To avoid it, I'm using:
[UIView performWithoutAnimation:^{
[self.collectionView reloadData];
}];
but it doesn't seem to work anymore on iOS 14, can someone help me?


This is the correct way to do it:
[UIView performWithoutAnimation:^{
[self.collectionView reloadData];
[self.collectionView layoutIfNeeded];
}];

Related

Animation when remove UICollectionViewCell

I have collection view, and have logic to delete cells from it. However, when cell is removed, next cell is appeared instantly on deleted cell place. Is there a way to add animation for deletion, for example, for 0.5 sec change opaque of cell, or something similar? There is a method i use for delete cell:
-(void)aMethod:(UIButton*)sender{
[self.viewModel deleteAt:[sender tag]];
[self.myCollectionView reloadData];
}

You have to use:
[UIView performWithoutAnimation:^{
[self.myCollectionView reloadData];
}];

performBatchUpdates on collectionview & allow user interaction

I'm trying to let the user have some control over the screen while updates are being performed on a collection view.
[self.collectionView performBatchUpdates:^{
[self.collectionView reloadData];
} completion:^(BOOL finished) {}];
I've tried wrapping the whole thing in an animation block and UIViewAnimationOptionAllowUserInteraction but no dice. Any thoughts how this might be done?
Thanks!

Disable UICollectionView animation on reloadData

For some reason, my UICollectionView animates the transition inside the visible cell when calling reloadData.
From what I understood it shouldn't do that, and that's what I am trying to do.
Why would the collection view animate on reload data? And how could I stop it?
I will be eventually using [UIView setAnimationsEnabled:YES/NO], but I would be hoping to fix it without too much extra code.

[UIView performWithoutAnimation:^{
[self.collectionView reloadSections:[NSIndexSet indexSetWithIndex:0]];
}];

Stop animation in UICollectionView cell

I have a timer that fires every second to refresh data on a UICollectionView cell, sometimes (especially when I rotate the device), the cell starts to blink every second. I want to stop this blink animation. However, I have another animation going on inside the collection view cell, so I don't want to disable all animations on it as this code does:
[UIView setAnimationsEnabled:NO];
[collectionView performBatchUpdates:^{
[collectionView reloadItemsAtIndexPaths:indexPaths];
} completion:^(BOOL finished) {
[UIView setAnimationsEnabled:YES];
}];

If you don't want animation on reloading collection view, why don't you just call
[collectionView reloadData];
It only reloads all visible cells.
For the animation inside of the collection view cell, why not code more in the cell object?

Stop UITableViewCells from animating when animating a UITableView

I am animating a UITableView. I want the table view to slide open like this:
http://www.youtube.com/watch?v=XIGJLbiRsXE
However, it opens like this:
http://www.youtube.com/watch?v=UJUX-ILCB_0
Notice how the table cells themselves are animating. How can I stop this from happening?
I am using autolayout. The code is thus:
[theView addSubview:theTable];
[theTable reloadData];
[theTable invalidateIntrinsicContentSize];
[UIView animateWithDuration:.33 animations:^{
[theView layoutIfNeeded];
}];
Other details, which may or may not matter:
The table view's parent is a scrollView
I have overridden the intrinsicContentSize of the table view to return the height of all the cells in the table view, so the table view will not scroll
I am changing the datasource of the table view before displaying it

I had a similar problem and was able to stop the animation on the UITableViewCell with the UIView performWithoutAnimation: method.
Use the tableView:willDisplayCell:forRowAtIndexPath: UITableViewDelegate method to get a reference to the cell before it is shown. Then, within the performWithoutAnimation: block, call layoutIfNeeded on the cell object to give it a chance to layout its subviews:
- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath
{
[UIView performWithoutAnimation:^{
[cell layoutIfNeeded];
}];
}

It might be too late to answer this question but the problem in these kind of cases generally lies in the animation block capturing all the pending layouts scheduled in the next run loop.
The solution that i use is. I call layoutIfNeeded before the animation (before setting or invalidating any constraints) and then inside the animation block.
In your case it will something like this,
[theView addSubview:theTable];
[theTable reloadData];
[theView layoutIfNeeded];
[theTable invalidateIntrinsicContentSize];
[UIView animateWithDuration:.33 animations:^{
[theView layoutIfNeeded];
}];

Have you considered animating instead an opaque subview that is positioned above the table view?
[theView addSubview:theTable];
[theTable reloadData];
UIView *subview = [[UIView alloc] initWithFrame:theTable.frame];
subview.backgroundColor = [UIColor whiteColor];
[theView addSubview:subview];
[UIView animateWithDuration:0.33 animations:^{
subview.frame = CGRectMake(subview.frame.origin.x, subview.frame.size.height, subview.frame.size.width, 0.0);
}];

Try laying out the table first, before you call [theView layoutIfNeeded] inside the animation block. Ideally you could layout piecemeal and for that 0.33 seconds you may get a scroll bar on the table but the goal is to get the table cell layout changes outside of the animated block.

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