Ios 在tableView:cellForRowAtIndexPath中无法实现这一点,因此我最终放弃了在ScrollView DiEndScrollingAnimation中设置选择,只使用performSelector:withObject:afterDel
在tableView:cellForRowAtIndexPath中无法实现这一点,因此我最终放弃了在ScrollView DiEndScrollingAnimation中设置选择,只使用performSelector:withObject:afterDelay:在所有更新完成后运行一个方法来设置选择和滚动位置。Ios 在tableView:cellForRowAtIndexPath中无法实现这一点,因此我最终放弃了在ScrollView DiEndScrollingAnimation中设置选择,只使用performSelector:withObject:afterDel,ios,uitableview,core-data,Ios,Uitableview,Core Data,在tableView:cellForRowAtIndexPath中无法实现这一点,因此我最终放弃了在ScrollView DiEndScrollingAnimation中设置选择,只使用performSelector:withObject:afterDelay:在所有更新完成后运行一个方法来设置选择和滚动位置。 #pragma mark - Fetched results controller delegate - (void)controllerWillChangeContent:(NSFe
#pragma mark - Fetched results controller delegate
- (void)controllerWillChangeContent:(NSFetchedResultsController *)controller
{
[self.tableView beginUpdates];
}
- (void)controller:(NSFetchedResultsController *)controller didChangeSection:(id <NSFetchedResultsSectionInfo>)sectionInfo
atIndex:(NSUInteger)sectionIndex forChangeType:(NSFetchedResultsChangeType)type
{
switch(type)
{
case NSFetchedResultsChangeInsert:
[self.tableView insertSections:[NSIndexSet indexSetWithIndex:sectionIndex] withRowAnimation:UITableViewRowAnimationFade];
break;
case NSFetchedResultsChangeDelete:
[self.tableView deleteSections:[NSIndexSet indexSetWithIndex:sectionIndex] withRowAnimation:UITableViewRowAnimationFade];
break;
}
}
- (void)controller:(NSFetchedResultsController *)controller didChangeObject:(id)anObject
atIndexPath:(NSIndexPath *)indexPath forChangeType:(NSFetchedResultsChangeType)type
newIndexPath:(NSIndexPath *)newIndexPath
{
UITableView *tableView = self.tableView;
switch(type)
{
case NSFetchedResultsChangeInsert:
[tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:newIndexPath] withRowAnimation:UITableViewRowAnimationTop];
[self.tableView selectRowAtIndexPath:newIndexPath animated:YES scrollPosition:UITableViewScrollPositionMiddle];
break;
case NSFetchedResultsChangeDelete:
[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
break;
case NSFetchedResultsChangeUpdate:
[self configureCell:[tableView cellForRowAtIndexPath:indexPath] atIndexPath:indexPath];
break;
case NSFetchedResultsChangeMove:
[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
[tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:newIndexPath]withRowAnimation:UITableViewRowAnimationFade];
break;
}
}
- (void)controllerDidChangeContent:(NSFetchedResultsController *)controller
{
[self.tableView endUpdates];
}
case NSFetchedResultsChangeInsert:
[tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:newIndexPath] withRowAnimation:UITableViewRowAnimationFade];
[tableView scrollToRowAtIndexPath:newIndexPath atScrollPosition:UITableViewScrollPositionMiddle animated:YES];
insertedIndexPath = newIndexPath; //remember for selection
break;
- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView {
[self.tableView selectRowAtIndexPath:insertedIndexPath animated:YES scrollPosition:UITableViewScrollPositionNone];
}
case NSFetchedResultsChangeInsert:
[tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:newIndexPath] withRowAnimation:UITableViewRowAnimationFade];
//save new index path into your own ivar
self.newlyInsertIndex = newIndexPath
break;
if (!self.changeIsUserDriven){
[self.tableView endUpdates];
if (self.newlyInsertedIndex){
//ScrollPositionNone == use least amount of effort to show cell
[self.tableView scrollToRowAtIndexPath:self.newlyInsertedIndex
atScrollPosition:UITableViewScrollPositionNone animated:YES];
//cleanup
self.newlyInsertedIndex = Nil;
}
}
- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView {
[self.tableView selectRowAtIndexPath:insertedIndexPath animated:YES scrollPosition:UITableViewScrollPositionNone];
}
@implementation MyTableViewController {
BOOL _selectFirstRow;
}
- (void) controller:(NSFetchedResultsController *)controller didChangeObject:(id)anObject atIndexPath:(NSIndexPath *)indexPath forChangeType:(NSFetchedResultsChangeType)type newIndexPath:(NSIndexPath *)newIndexPath
{
UITableView *tableView = self.tableView;
switch (type) {
case NSFetchedResultsChangeInsert:
[tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:newIndexPath]
withRowAnimation:UITableViewRowAnimationFade];
_selectFirstRow = YES;
break;
- (void) selectFirstTableRow
{
[self.tableView selectRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:0]
animated:YES
scrollPosition:UITableViewScrollPositionTop];
}
- (void) controllerDidChangeContent:(NSFetchedResultsController *)controller
{
[self.tableView endUpdates];
if (_selectFirstRow) {
[self selectFirstTableRow];
_selectFirstRow = NO;
}
}
- (void)controllerDidChangeContent:(NSFetchedResultsController *)controller
{
[self.tableView endUpdates];
if (_newObject) {
NSIndexPath *ip = [self.fetchedResultsController indexPathForObject:_newObject];
[self.tableView selectRowAtIndexPath:ip animated:YES
scrollPosition:UITableViewScrollPositionMiddle];
}
}