Question

I’m trying to update UITableView with the following code:

NSMutableIndexSet *sectionsToDelete = [NSMutableIndexSet indexSet];
NSMutableIndexSet *sectionsToInsert = [NSMutableIndexSet indexSet];
NSMutableIndexSet *sectionsToReload = [NSMutableIndexSet indexSet];

/* ... */

[[self tableView] beginUpdates];
if ([sectionsToReload count]) {
    DBGLogObject(sectionsToReload);
    [[self tableView] reloadSections:sectionsToReload withRowAnimation:animation];
}
if ([sectionsToDelete count]) {
    DBGLogObject(sectionsToDelete);
    [[self tableView] deleteSections:sectionsToDelete withRowAnimation:animation];
}
if ([sectionsToInsert count]) {
    DBGLogObject(sectionsToInsert);
    [[self tableView] insertSections:sectionsToInsert withRowAnimation:animation];
}
[[self tableView] endUpdates];

Log:

sectionsToReload = <NSMutableIndexSet: 0x71b19f0>[number of indexes: 2 (in 1 ranges), indexes: (1-2)]
sectionsToInsert = <NSMutableIndexSet: 0x71ac570>[number of indexes: 3 (in 2 ranges), indexes: (0 3-4)]

(Note there’s no sectionsToDelete in the log.)

The thing is that even though there’s no deletion I get an error:

2012-10-04 19:21:16.769 Syntax[903:c07] *** Assertion failure in -[UITableView _endCellAnimationsWithContext:], /SourceCache/UIKit_Sim/UIKit-2372/UITableView.m:826
2012-10-04 19:24:51.655 Syntax[903:c07] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'attempt to delete section 2, but there are only 2 sections before the update'

Any ideas?

Answer 1

Did “Clean Build Folder” and now it works like expected. I have no idea why.