[英]How to insert and remove a row from UITableView at the same time
我想讓UITableView像手風琴一樣演奏。 輕敲一行時,應在該輕敲行的正下方插入一個特殊行,然后從以前的水龍頭中刪除任何其他特殊行。 我嘗試了很多事情,但是下面的代碼是我的最新嘗試。
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
NSIndexPath *removeIndex;
for (int i = 0; i < [players count]; i++) {
NSString *player = [players objectAtIndex:i];
if ([player isEqualToString:@"ADJUST_SCORE_ROW"]) {
removeIndex = [NSIndexPath indexPathForRow:i inSection:indexPath.section];
[players replaceObjectAtIndex:i withObject:@"DELETE_ME"];
break;
}
}
[scoreTableView beginUpdates];
NSIndexPath *insertPath;
if (removeIndex && [removeIndex row] < indexPath.row) {
insertPath = [NSIndexPath indexPathForRow:indexPath.row inSection:indexPath.section];
} else {
insertPath = [NSIndexPath indexPathForRow:indexPath.row + 1 inSection:indexPath.section];
}
[players insertObject:@"ADJUST_SCORE_ROW" atIndex:insertPath.row];
[scoreTableView insertRowsAtIndexPaths:[NSArray arrayWithObject:insertPath] withRowAnimation:UITableViewRowAnimationTop];
for (int i = 0; i < [players count]; i++) {
NSString *player = [players objectAtIndex:i];
if ([player isEqualToString:@"DELETE_ME"]) {
[players removeObject:player];
break;
}
}
if (removeIndex) {
[scoreTableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:removeIndex] withRowAnimation:UITableViewRowAnimationTop];
}
[scoreTableView endUpdates];
}
關鍵在於刪除和插入發生的位置。
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
Player *selectedPlayer = nil;
//Get rid of any adjustment score row
NSIndexPath *removeIndex;
for (int i = 0; i < [players count]; i++) {
id player = [players objectAtIndex:i];
if ([player isKindOfClass:[NSString class]] && [player isEqualToString:@"ADJUST_SCORE_ROW"]) {
if (i == indexPath.row) {
[scoreTableView selectRowAtIndexPath:indexPath animated:NO scrollPosition:UITableViewScrollPositionNone];
return; //This is the case where the row that was selected was an adjustment row
}
removeIndex = [NSIndexPath indexPathForRow:i inSection:indexPath.section];
[players replaceObjectAtIndex:i withObject:@"DELETE_ME"];
break;
}
}
selectedPlayer = [players objectAtIndex:indexPath.row];
[scoreTableView beginUpdates];
NSIndexPath *insertPath;
if (removeIndex && [removeIndex row] < indexPath.row) {
insertPath = [NSIndexPath indexPathForRow:indexPath.row inSection:indexPath.section];
} else {
insertPath = [NSIndexPath indexPathForRow:indexPath.row + 1 inSection:indexPath.section];
}
HoleScore *holeScore = [[round scoreForPlayer:[players objectAtIndex:indexPath.row] holeGroup:self.holeGroupIndex andHole:hole.holeIndex] objectForKey:CURRENT_HOLE_SCORE];
if (holeScore == nil) {
NSEntityDescription *scoreEntity = [NSEntityDescription entityForName:@"HoleScore" inManagedObjectContext:moc];
holeScore = [[HoleScore alloc] initWithEntity:scoreEntity insertIntoManagedObjectContext:moc];
[holeScore setPlayer:selectedPlayer];
[holeScore setHoleGroupIndex:[NSNumber numberWithInteger:holeGroupIndex]];
[holeScore setHoleIndex:[NSNumber numberWithInteger:hole.holeIndex]];
[holeScore setStrokes:[NSNumber numberWithInteger:[hole par]]];
[holeScore setPuts:[NSNumber numberWithInteger:2]];
HoleScoreCardTableViewCell *playerCell = (HoleScoreCardTableViewCell*)[scoreTableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:indexPath.row inSection:indexPath.section]];
[playerCell setHoleScore:holeScore];
[round addScoresObject:holeScore];
NSError *error;
[moc save:&error];
if (error) {
NSLog(@"Error saving: %@", error.localizedDescription);
}
}
for (int i = 0; i < [players count]; i++) {
id player = [players objectAtIndex:i];
if ([player isKindOfClass:[NSString class]] && [player isEqualToString:@"DELETE_ME"]) {
[players removeObject:player];
break;
}
}
if (removeIndex) {
[scoreTableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:removeIndex] withRowAnimation:UITableViewRowAnimationTop];
}
[players insertObject:@"ADJUST_SCORE_ROW" atIndex:insertPath.row];
[scoreTableView insertRowsAtIndexPaths:[NSArray arrayWithObject:insertPath] withRowAnimation:UITableViewRowAnimationTop];
[scoreTableView endUpdates];
}
您必須為委托方法更新節數和相應行數...
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