I have searched stack overflow (Getting row of UITableView cell on button press) and have found many solutions that people claim to work but I have yet to find the perfect solution. I am trying to get the indexPath of the next/previous UITextField within my UITableView using a CGPoint so that I can scroll to it and make it first responder. Most of the time it is correct however if my text field is a previous field high up in the UITableView in another section I get the wrong result.
Here is the code (Note: nextTxtField is a UIView):
CGPoint point = [nextTxtField convertPoint:CGPointZero toView:tableView];
NSIndexPath *indexPath = [tableView indexPathForRowAtPoint:point];
[UIView animateWithDuration:0.03 delay:0.0 options:0 animations:^{
[tableView scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionTop animated:NO];
} completion:^(BOOL finished) {
dispatch_async(dispatch_get_main_queue(), ^(void){
[nextTxtField becomeFirstResponder];
});
}];
You may get the indexPath of by row/item of UITableView by calling :
[NSIndexPath indexPathForRow:row inSection:section];
[NSIndexPath indexPathWithIndex:index];
[NSIndexPath indexPathForItem:item inSection:section];
Once you get the indexPath, you may get the UITableViewCell by:
[_tableView cellForRowAtIndexPath:indexpath];
It returns a UITableViewCell. TypeCast it to your cell class (be sure about it).
Then you may grab hold of nextTxtField as:
[((YourCellClass *) cell).nextTxtField becomeFirstResponder]
after scrolling UITableView to that indexPath.
Related
I have a horizontal UICollectionView that implements UICollectionViewLayout and uses targetContentOffsetForProposedContentOffset for a custom fling/paging functionality. Each cell is nearly the width of the screen with the next cell showing slightly to the right. The functionality works great, but I want to be able to delete the cell at index 0 when the current cell is index 1. I'm currently able to calculate and do this just fine, but upon deleting the index 0 cell it slides to the next cell (old index 2, new 1 (after deleting 0)) because of the current content offset. I'm not sure how I can delete index 0 while maintaining the current layout.
Right now in my delegate I'm doing:
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{
float cellWidth = self.collectionView.bounds.size.width - 20;
float currentPage = self.collectionView.contentOffset.x / cellWidth;
if (currentPage == 1) {
[self remove:0];
}
}
-(void)remove:(int)i {
[self.collectionView performBatchUpdates:^{
[self.data removeObjectAtIndex:0];
NSIndexPath *indexPath =[NSIndexPath indexPathForRow:0 inSection:0];
[self.collectionView deleteItemsAtIndexPaths:[NSArray arrayWithObject:indexPath]];
} completion:^(BOOL finished) {
}];
}
So the calculation and deletion works fine, but upon deleting [0], the collection view is scrolled to the next cell..and I'm not sure how to stop it.
I've tried self.collectionview.contentOffset = CGMakePoint(0,0) after the deleting, but the transition is still noticeably buggy. Any ideas on how to approach this problem?
so after a ton of trial and error I was able to resolve the issue. It might be a little hackish but I just wrapped the batch with a uiview animation that has no duration. Basically it overrides the deletion animation
[UIView animateWithDuration:0 animations:^{
[self.collectionView performBatchUpdates:^{
[scrollView setContentOffset:CGPointMake(0, 0) animated:NO];
[self.data removeObjectAtIndex:0];
NSIndexPath *indexPath =[NSIndexPath indexPathForRow:0 inSection:0];
[self.collectionView deleteItemsAtIndexPaths:#[indexPath]];
[self.collectionView.collectionViewLayout invalidateLayout];
} completion:nil];
}];
I have a UISearchController and i want to select the first row of the searchResultsController tableview on click of search button in the keyboard.
For that I tried implementing
-(void)searchButtonClicked:(UISerachBar*)searchBar {
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:0];
[self.searchResultsController.tableView selectRowAtIndexPath: indexPath animated:false scrollPostion:UITableViewScrollPositionNone];
[self.searchResultsController tableview:self.searchResultsController.tableView didSelectRowAtIndexPath: indexPath];
}
but it didn't work for me!!
Then I tried to make a separate method:
-(void) plotPinOnMapWithIndexPath:(NSIndexPath*)indexpath;
and called it in didSelectRowAtIndexPath and in searchButtonClicked method by passing the indexPaths.But the problem is that the cell doesn't get highlighted the way it gets highlighted when user clicks on it.
This works for me, and is correct:
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:0];
[self.tableView selectRowAtIndexPath:indexPath animated:NO scrollPosition:UITableViewScrollPositionNone];
optionally try this:
[self.tableView:self.tableView didSelectRowAtIndexPath:indexPath];
or you can use Segue to continue with result:
[self performSegueWithIdentifier:"showDetailView" sender:self];
In prepareForSegue method you pass parameters....
It worked!!
-(void)searchButtonClicked:(UISerachBar*)searchBar {
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:0];
[self tableview:self.searchResultsController.tableView didSelectRowAtIndexPath: indexPath];
}
My Project:
I have an UITableView in My project. Each and every UITableViewCell have one UITextView as a subview. When user tap on 'Add' button, I need to add one more UITableViewCell with UITextView to UITableView and I have to set focus into the added UITextView.
What I've Tried:
Once user tap on add button, I will update the numberOfRowsInSection of UITableView and subsequently I'll call [UITableView reloadData] to invoke [UITableView cellForRowAtIndexPath]. Here, I'll append the UITextView as subview of UITableViewCell.It Works fine until this point.
My problem:
I need to set focus into the UITextView Once after the [UITableView cellForRowAtIndexPath] get called. When I called the set focus method for UITextView after [UITableView reloadData], It is not working. I want to know, Is there any callback method for [UITableView cellForRowAtIndexPath]?
Thanks for your answers.
Try this,
In Add button action
//Assuming only 1 section, if you have more section find sections by `numberOfSections` method
NSInteger totalRows = [self.tableView numberOfRowsInSection:0];
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:totalRows inSection:0];
[tableView beginUpdates];
[tableView insertRowsAtIndexPaths:#[indexPath] withRowAnimation:UITableViewRowAnimationNone];
[tableView endUpdates];
//If you have custom cell
CustomCell *cell = (CustomCell *)[self.tableView cellForRowAtIndexPath:indexPath];
[cell.textView becomeFirstResponder];
//If you are not using custom cell, then set tag to textView and
//UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
//UITextView *textView = (UITextView *)[cell viewWithTag:kTextViewTag];
//[textView becomeFirstResponder];
after you have called your reloadData method you can do something like this:
To get a reference to the last row in the last section…
// First figure out how many sections there are
NSInteger lastSectionIndex = [self.myTableView numberOfSections] - 1;
// Then grab the number of rows in the last section
NSInteger lastRowIndex = [self.myTableView numberOfRowsInSection:lastSectionIndex] - 1;
// Now just construct the index path
NSIndexPath *pathToLastRow = [NSIndexPath indexPathForRow:lastRowIndex inSection:lastSectionIndex];
//Grab a reference of your cell from the last row
MyCustomCell *myCC = [self.myTableView cellForRowAtIndexPath:pathToLastRow];
//Use this cell reference to set focus to your UITextView
[myCC.myTextView setFirstResponder:YES];
I don't know why this doesn't work. indexOfIcon is correct, section is correct (checked with NSLog) If I select one everything is correct. But this line doesn't do a thing...why? If selected it should have a blue border. This works great while doing it "manually" but not with code..
- (void)viewWillAppear:(BOOL)animated
{
NSUInteger indexOfIcon;
if(self.mainCategory.icon){
indexOfIcon = [self.icons indexOfObject: self.mainCategory.icon];
} else {
indexOfIcon = 0;
}
[self.collectionView selectItemAtIndexPath:[NSIndexPath indexPathForRow:indexOfIcon inSection:0] animated:YES scrollPosition:UICollectionViewScrollPositionBottom];
}
add
UICollectionViewCell *cell = [collectionView cellForItemAtIndexPath:indexPath];
cell.selected = YES;
and the cell will be selected.
The command [self.collectionView selectItemAtIndexPath:[NSIndexPath indexPathForRow:indexOfIcon inSection:0] animated:YES scrollPosition:UICollectionViewScrollPositionBottom]; tells the collectionView, that the cell is in selected state, but don't set the state of the cell.
After years selection seems to work fine (even in viewDidLoad:)
NSIndexPath *indexPath = [NSIndexPath indexPathForItem:0 inSection:0];
[_collection selectItemAtIndexPath:indexPath animated:NO scrollPosition:UICollectionViewScrollPositionLeft];
successfully triggers cell's -setSelected:
Currently I have a UITableView with custom cells and in each cell there is a UITextField, the problem is that sometimes the UITextField is covered by the UIKeyboard.
So right now I have the Y coordinate for the UIKeyboard and my UITableView is functioning properly with the cells.
So pretty much how can I use that Y coordinate (float), in order to scroll my UITableView to that Y coordinate plus the height of the cell in order to get it right above my UIKeyboard?
Also when I the keyboard hides, how would I reset the UITableView to its normal position that it was in?
Any advice would be appreciated!
Thanks!
CustomCell *cell = (CustomCell*)[[thetextField superview] superview];
CGRect cellRect = [cell convertRect:cell.frame toView:self.view];
float bottomCell = cellRect.origin.y - cellRect.size.height;
if (bottomCell >= keyboardY) {
NSIndexPath *indexPath = [thetableView indexPathForCell:cell];
[thetableView scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionTop animated:YES];
}
One or the other of UITableView's
- (void)scrollToRowAtIndexPath:(NSIndexPath *)indexPath atScrollPosition:(UITableViewScrollPosition)scrollPosition animated:(BOOL)animated;
- (void)scrollToNearestSelectedRowAtScrollPosition:(UITableViewScrollPosition)scrollPosition animated:(BOOL)animated;
I'm guessing that control isn't getting into the if statement. Consider skipping the y-coordinate check in favor of just scrolling the table view regardless of where it is.
CustomCell *cell = (CustomCell *)[[theTextField superview] superview];
NSIndexPath *indexPath = [theTableView indexPathForCell:cell];
[theTableView scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionTop animated:YES];
OK, if you're sure it's getting called, then make sure your indexPath isn't nil, which may happen if cell isn't in the tableView or if it's not a cell.
UITableView adjust itself whenever the keyboard is displayed.
However, it won't do it if you didn't set the UITableViewCellSelectionStyle of your custom cell to UITableViewCellSelectionStyleNone.
i solved by using the below code.
[cell setSelectionStyle:UITableViewCellSelectionStyleNone];