IOS By clicking on a UITableViewCell scroll to another UITableViewCell - ios

I have a UITableView with 10 rows. By clicking on the first row I want to scroll to row 5 of the UITableView.
How can i do that?


Try this:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath;
{
if (indexPath.row == 0) {
[tableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:5 inSection:0] atScrollPosition:UITableViewScrollPositionTop animated:YES];
}
}


Should work!
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
if(indexPath.row == 0) {
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:4 inSection:0];
[tableView scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionTop animated:YES];
}
}

Related

Expanding a table cell on clicking a button outside it in objective c

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
[tableView beginUpdates]; // tell the table you're about to start making changes
if ([indexPath compare:self.expandedIndexPath] == NSOrderedSame) {
self.expandedIndexPath = nil;
} else {
self.expandedIndexPath = indexPath;
}
[tableView endUpdates]; // tell the table you're done making your changes
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
if ([indexPath compare:self.expandedIndexPath] == NSOrderedSame) {
return 200.0; // Expanded height
}
return 44.0; // Normal height
}
- (void)pieChart:(XYPieChart *)pieChart didSelectSliceAtIndex:(NSUInteger)index
{
This is a function of getting the index , when clicking a pie chart.
what i need to do is expand the corresponding row of table when pie is selected
}
#end

If i got your idea you need to select the row at index path
- (void)pieChart:(XYPieChart *)pieChart didSelectSliceAtIndex:(NSUInteger)index
{
// get indexPath with index
// remember if you have few sections then you will need to update inSection:0 value
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:index inSection:0];
[yourTableView selectRowAtIndexPath:indexPath
animated:NO
scrollPosition:UITableViewScrollPositionNone];
// This will also Highlighted the row. Then delegate
[yourTableView.delegate someTableView didSelectRowAtIndexPath:indexPath];
}

UITableView scrollToRowAtIndexPath:atScrollPosition:animated: lag my app seriously

I have a tableview. It will receive mess of data from server. Every time tableview receive data I wanna it show the latest one at bottom.I called scrollToRowAtIndexPath:atScrollPosition:animated: but it lag my app i can do nothing else in my screen when scroll to bottom of tableview.
Here is my main code
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *identifier = #"tableViewCell";
DLtestCellTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:identifier];
if (cell == nil) {
cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:identifier];
}
NSDictionary* dict = arr[indexPath.row];
cell.myLabel.attributedText = dict[#"content"];
[cell.myImageview sd_setImageWithURL:dict[#"imageUrl"] placeholderImage:[UIImage imageNamed:#"transparentPlaceHolder"]];
return cell;
}
and here is scrolling to the bottom main code
- (void)reloadTableView
{
dispatch_async(dispatch_get_main_queue(), ^{
NSIndexPath *lastRow = [NSIndexPath indexPathForRow:row inSection:0];
[self.tableView insertRowsAtIndexPaths:#[lastRow] withRowAnimation:UITableViewRowAnimationLeft];
});
[self.tableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:row inSection:0] atScrollPosition:UITableViewScrollPositionBottom animated:NO];
}

You should use scrollToRowAtIndexPath method.
And in viewWillAppear write below code.
[theTableView reloadData];
NSIndexPath* ip = [NSIndexPath indexPathForRow:rowNumber inSection:sectionNumberHere];
[theTableView scrollToRowAtIndexPath:ip atScrollPosition:UITableViewScrollPositionTop animated:NO];
here 'rowNumber' is the row number in the data source you want to scroll to.
or you can calculate 'rowNumber' as follows:
int lastRowNumber = [tableView numberOfRowsInSection:0] - 1;
and pass this lastRowNumber to indexPathForRow.
NOTE : numberOfRowsInSection returns row count, not the last row number (which is row count - 1).

Mark all checkboxes in UITableView with a Button Click

In my UITableView "tableview" I added checkboxes in each row using UITableView default functionality.
- (void)viewDidLoad {
[tableview setEditing:YES animated:YES];
}
-(UITableViewCellEditingStyle)tableView:(UITableView *)tableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath
{
return 3;
}
I can select only Multiple checkboxes.But I want to select all the checkboxes using a button click.I can use didSelectRowAtIndexPath to loop through all the rows and get the contents but the checkboxes stays unchecked.
- (IBAction)selectallbutton:(id)sender {
NSInteger nRows=[arr count];
for(int i=0;i<nRows;i++){
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:i inSection:0];
[self tableView:tableview didSelectRowAtIndexPath:indexPath];
}
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
NSLog(#"%#",[arr objectAtIndex:indexPath.row]);
}
Is it possible to check them all using this approach or should I try another way?

try this,
- (IBAction)selectallbutton:(id)sender {
NSInteger nRows=[arr count];
for(int i=0;i<nRows;i++){
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:i inSection:0];
UITableViewCell *cell = [tableview cellForRowAtIndexPath:indexPath];
[cell setSelected:YES animated:NO]; //you can change animated:YES if needed
}
}

Changing Alpha of UITableView Section on Cell Select

I have an issue when using multiple table view sections. I am trying to change the alpha for a cell when the user taps it. Each section in the table view has one row.
Here is my code.
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
NSIndexPath *indexPathInSection = [NSIndexPath indexPathForRow:0 inSection:indexPath.section];
[tableView cellForRowAtIndexPath:indexPathInSection].contentView.alpha = 0.2f;
}
- (void)tableView:(UITableView *)tableView didDeselectRowAtIndexPath:(NSIndexPath *)indexPath{
NSIndexPath *indexPathInSection = [NSIndexPath indexPathForRow:0 inSection:indexPath.section];
[tableView cellForRowAtIndexPath:indexPathInSection].contentView.alpha = 1.0f;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
MatchCell *cell = (MatchCell *)[self cellForIdentifier:tableView:#"MatchCell"];
MatchedUser *user = (MatchedUser *)(self.matches)[indexPath.section];
[self configureMatchCell:cell :user :tableView];
NSIndexPath *selection = [NSIndexPath indexPathForRow:0 inSection:indexPath.section];
if (selection.section == indexPath.section && cell.isSelected){
cell.contentView.alpha = 0.2f;
}else{
cell.contentView.alpha = 1.0f;
}
return cell;
}
The alpha is applied to the cell that is tapped but other cells are also changed. This is because it is applied according to the row number not the section and row number. How can I specify the cell at the section and row index only?
Thanks.

UITableViewCells disappears randomly on drag after resize another row

I have a UITableView. I use this code to resize the selected row:
-(void) viewWillAppear:(BOOL)animated {
....
[self.tableView registerNib:[UINib nibWithNibName:#"ICSceneDetailViewTableViewCell" bundle:[NSBundle mainBundle]] forCellReuseIdentifier:IC_CELL_SCENE_EDITOR_CELL];
...
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
-(int) tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
if (tableView == nil)
return 0;
if (self.scenes != nil) {
return self.scenes.count;
}
return 0;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
ICSceneDetailViewTableViewCell *cell = (ICSceneDetailViewTableViewCell*)[tableView dequeueReusableCellWithIdentifier:IC_CELL_SCENE_EDITOR_CELL forIndexPath:indexPath];
if (cell == nil) {
cell = [[ICSceneDetailViewTableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:IC_CELL_SCENE_EDITOR_CELL];
}
ICScene *scene = [self.scenes objectAtIndex:[indexPath row]];
[cell.titleTextField setText:scene.title];
return cell;
}
-(void) tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
self.selectedRow = indexPath.row;
[self.tableView reloadRowsAtIndexPaths:[NSArray arrayWithObjects:indexPath, nil] withRowAnimation:UITableViewRowAnimationNone];
[self.tableView scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionTop animated:NO];
}
-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
if ([indexPath row] == self.selectedRow) {
return 250;
}
if (IS_IPAD) {
return 80;
}
else {
return 40;
}
}
-(UITableViewCellEditingStyle)tableView:(UITableView *)tableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath {
return UITableViewCellEditingStyleNone;
}
BUT, after selecting any row (name it A, and A become resized):
if I drag another row (name it B) then randomly other rows disappears (except A).
if I scroll tableview and back to drag on same row (B) then, again randomly, other(s) cell(s) disappear(s), but not always the same(s).
if I comment heightForRowAtIndexPath then drag behavior is normal, but row can't be resized :(
I already searched many similar answers (adjusting selectedBackgroundView on cell, backgroundView cell, drawRect on cell, etc) but no one solution/workaround works for this simple (i think) code.
Thanks in advance :)

Yeh, answering my own question.
I found an alternative to resize selected UITableViewCell without calling to reloadRowsAtIndexPaths.
Replacing reloadRowsAtIndexPaths with:
[self.tableView beginUpdates];
[self.tableView endUpdates];
refreshes visible rows without calling cellForRowAtIndexPath. Imho the problem where dequeuing cells on every row being reloaded.
The resulting code is:
-(void) tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
self.selectedRow = indexPath.row;
[self.tableView scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionTop animated:NO];
[self.tableView beginUpdates];
[self.tableView endUpdates];
}
So, automagically there isn't any disappearing row :)

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