Friday, June 7, 2013

UITableView beginUpdates example in Objective C (iOS).

UITableView beginUpdates

Begin a series of method calls that insert, delete, or select rows and sections of the receiver.

- (void)beginUpdates

Discussion of [UITableView beginUpdates]
Call this method if you want subsequent insertions, deletion, and selection operations (for example, cellForRowAtIndexPath: and indexPathsForVisibleRows) to be animated simultaneously. This group of methods must conclude with an invocation of endUpdates. These method pairs can be nested. If you do not make the insertion, deletion, and selection calls inside this block, table attributes such as row count might become invalid. You should not call reloadData within the group; if you call this method within the group, you will need to perform any animations yourself.

UITableView beginUpdates example.
- (void)tableView:(UITableView *)tableView performOperation:(void(^)())operation completion:(void(^)(BOOL finished))completion
    [UIView animateWithDuration:0.0 animations:^{

        [tableView beginUpdates];
        if (operation)
        [tableView endUpdates];

    } completion:^(BOOL finished) {

        if (completion)

Example of [UITableView beginUpdates].
- (void)setDownloadedImage:(NSMutableDictionary *)d {
    NSIndexPath *indexPath = (NSIndexPath *)[d objectForKey:@"IndexPath"];
    [indexPathDelayed addObject:indexPath];
    if (!([table isDragging] || [table isDecelerating])) {
        [table beginUpdates];
        [table insertRowsAtIndexPaths:indexPathDelayed withRowAnimation:UITableViewRowAnimationFade];
        [table endUpdates];
        // --> Call Method Here <--
        loadingView.hidden = YES;
        [indexPathDelayed removeAllObjects];

UITableView beginUpdates example.
What about this?

[CATransaction begin];

[CATransaction setCompletionBlock:^{
    // animation has finished

[tableView beginUpdates];
// do some work
[tableView endUpdates];

[CATransaction commit];

End of UITableView beginUpdates example article.