我正在使用基于导航的CoreData模板开发iOS应用程序.
我想在将其插入表视图后选择并“滚动到可见”一行.理想情况下,我想选择它,取消选择它并再次选择它,以获得一种闪烁效果.
我想在将其插入表视图后选择并“滚动到可见”一行.理想情况下,我想选择它,取消选择它并再次选择它,以获得一种闪烁效果.
正如我使用的方法,模板提供,即:
#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]; }
我有点困惑,不知道,在哪里放选择代码.
如果我放一个
[tableView selectRowAtIndexPath:<#(NSIndexPath *)#>动画:其中#(BOOL)#>的scrollPosition:其中#(UITableViewScrollPosition)#>]
成
– (void)controllerDidChangeContent:(NSFetchedResultsController *)控制器,
它会选择行,但会立即取消选择它,并且滚动操作也不应该如此.
解决方法
在方法控制器中:didChangeObject:atIndexPath:forChangeType:newIndexPath:
更改此部分:
更改此部分:
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]; }
记得添加insertedIndexPath变量.