CODEWITHSUNDEEP
objective-ccocoa-touchuitableviewanimation
madmax
madmax

Reputation: 1813

How to reload and animate just one UITableView cell/row?

how can I reload and animate just one cell/row ? Right now i download some files. Everytime a file finished downloading, i call it's finished delegate and call [tableview reload]. But then the whole table reloads. And how can i animate the table, so that it doesn't blink in. For example a fade effect or so.

greets Max

Upvotes: 76

Views: 91632

Answers (6)

Akbar Khan
Akbar Khan

Reputation: 2417

Swift 4 & 5

For TableView

let index = IndexPath(row: 0, section: 0)
tableView.reloadRows(at: [index], with: .automatic)

For CollectionView

let index = IndexPath(item: 2, section: 0)
collectionView.reloadItems(at: [index])

Upvotes: 15

BLC
BLC

Reputation: 2290

To reload particular cells in a tableView at given indexPaths, you need to create an array of indexPaths and then call function reloadRowsAtIndexPaths on the tableView.

Here is the example:

Swift 5:

let indexPathsToReload = [indexPath1, indexPath2, indexPath3]
tableView.reloadRows(at: indexPathsToReload, with: .none)

Objective C:

NSArray *indexPaths = @[indexPath1, indexPath2, indexPath3];
[self.tableView reloadRowsAtIndexPaths:indexPaths withRowAnimation:UITableViewRowAnimationNone];

or

NSArray *indexPaths = [NSArray arraywithobject:@"indexPath1", @"indexPath2", @"indexPath3",nil];
[self.tableView reloadRowsAtIndexPaths:indexPaths withRowAnimation:UITableViewRowAnimationNone];

Upvotes: 2

Milad Bahramzadeh
Milad Bahramzadeh

Reputation: 49

Swift

You can use 

let selectedIndexPath = IndexPath(item:0 , section: 0)
self.tableView.reloadRows(at: [selectedIndexPath], with: .none)

in order to reload a specific cell.

Upvotes: 2

slammer
slammer

Reputation: 278

If you only need to update the text in the tableview cell..

UITableViewCell *cell = [_myTableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:1]];

cell.textLabel.text = [NSString stringWithFormat:@"%i", (int)_targetMaxDistanceSlider.value];

Upvotes: 6

Muhammad Aamir Ali
Muhammad Aamir Ali

Reputation: 21087

Apple Document done it with new syntax

[tableView reloadRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationNone];

Upvotes: 1

James Bedford
James Bedford

Reputation: 28962

Use the following UITableView instance method:

- (void)reloadRowsAtIndexPaths:(NSArray *)indexPaths withRowAnimation:(UITableViewRowAnimation)animation

You have to specify an NSArray of NSIndexPaths that you want to reload. If you just want to reload. If you only want to reload one cell, then you can supply an NSArray that only holds one NSIndexPath. For example:

NSIndexPath* rowToReload = [NSIndexPath indexPathForRow:3 inSection:0];
NSArray* rowsToReload = [NSArray arrayWithObjects:rowToReload, nil];
[myUITableView reloadRowsAtIndexPaths:rowsToReload withRowAnimation:UITableViewRowAnimationNone];

You can see the UITableViewRowAnimation enum for all the possible ways of animating the row refresh. If you don't want any animation then you can use the value UITableViewRowAnimationNone, as in the example.

Reloading specific rows has a greater advantage than simply getting the animation effect that you'd like. You also get a huge performance boost because only the cells that you really need to be reloaded are have their data refreshed, repositioned and redrawn. Depending on the complexity of your cells, there can be quite an overhead each time you refresh a cell, so narrowing down the amount of refreshes you make is a necessary optimization that you should use wherever possible.

Upvotes: 189

Related Questions