UITableView with UITextView scrolling issue - ios

I have composed a tableview with some custom cells. Some of the custom cells contain UIWebView, some has UISlider plus UITextField, some has UIButton.
Now when I click on textfield which is uitableviewcell's subview at the bottom of the UITableView, I can't manage to get my table cell properly visible above the keyboard.
Using of UITableViewController instead of UIViewController is not possible for me. Because my UI structure is somewhat weird and dynamic. In simple way it is like
UIView -> UIScrollView with paging -> x number of UITableViews -> y number of UITableViewCell -> z number of UITextFields, UISliders, UIWebViews, UIButtons, UILables, etc.
I have also tried below code to make it work.
- (void)textFieldDidBeginEditing:(UITextField *)textField
{
UITableViewCell *cell = (UITableViewCell*) [[textField superview] superview];
[table_Question[pageNumber] scrollToRowAtIndexPath:[table_Question[pageNumber] indexPathForCell:cell] atScrollPosition:UITableViewScrollPositionTop animated:YES];
}
but it is not working :(
Thanks,
EDIT 1:
I have checked references for textfield, tableviewcell and tableview. So reference of object is not the problem.

Try this code....
- (void)textFieldDidBeginEditing:(UITextField *)textField
{
UITableViewCell *cell = (UITableViewCell*) [[textField superview] superview];
NSIndexPath *indexPath = [[table_Question[pageNumber] indexPathForCell:cell];
int totalRows = 0;
if([[table_Question[pageNumber] numberOfSections] > 1)
{
for(int i = 0; i<([indexPath.section] - 1);i++)
{
totalRows += [[table_Question[pageNumber] numberOfRowsInSection:i];
}
}
totalRows += indexPath.row;
int yPosition = totalRows * cell.frame.size.height;
CGPoint offset = CGPointMake(0, yPosition);
[[table_Question[pageNumber] setContentOffset:offset animated:YES];
}
This will helps for you...

Try this code
- (void)textFieldDidBeginEditing:(UITextField *)textField
{
UITableViewCell *aCell = [table_Question[pageNumber] cellForRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:1]];
CGSize cellSize = aCell.frame.size;
[table_Question[pageNumber] setContentOffset:CGPointMake(0, cellSize.height*2) animated:YES];
}

As per my understanding, you want to show the UITextField as well as the keyboard, when the user starts editing the UITextField inside the UITableViewCell.
If that's the case, you can set the contentInset of the UITableView to the required size and then just scroll to the required index path.
Following is a sample code:
-(BOOL)textFieldShouldBeginEditing:(UITextField *)textField
{
#try
{
table_Question[pageNumber].contentInset = UIEdgeInsetsMake(CGFloat Req_top, CGFloat Req_left, CGFloat Req_bottom, CGFloat Req_right);
[table_Question[pageNumber] scrollToRowAtIndexPath:[table_Question[pageNumber] indexPathForCell:cell] atScrollPosition:UITableViewScrollPositionTop animated:YES];
//Add this to you code to scroll in the tableview gets hidden by keyboard
CGPoint scrollPoint = CGPointMake(0, Required_Height);
[yourScrollView setContentOffset:scrollPoint animated:YES];
}
}

Related

UITextView in UITableViewCell scroll to location

I have a UITextView in a UITableViewCell. They both dynamically size itself to fit. The problem I have is that when the texview reaches below the bottom of the screen (from making new lines), the tableView does not scroll to its location.
I tried this code, but it didn't work.
- (void)textViewDidChangeSelection:(UITextView *)textView {
[textView scrollRangeToVisible:textView.selectedRange];
}
You can find the cell containing the textView and tell the table view to scroll to that cell:
UIView *parentView = textView.superview;
while(![parentView isKindOfClass:[UITableViewCell class]]) {
parentView = parentView.superview;
}
NSIndexPath *indexPath = [self.tableView indexPathForCell:(UITableViewCell*)parentView];
[self.tableView scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionMiddle animated:YES];
You should add code below to scroll the tableView too:
- (void)textViewDidChangeSelection:(UITextView *)textView {
[textView scrollRangeToVisible:textView.selectedRange];
// since you are only scrolling the table a little bit and not by a whole cell, then change the scrollView.offset
CGPoint offset = tableView.contentOffset;
offset.x += 20; // an example. You need to change this based on the new size of the textview.
tableView.contentOffset = offset;
}

Keep expanded UITableViewCell fixed on top

I have implemented SKSTableView and I used this command:
[tableView scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionTop animated:YES];
when I press a cell that is expandable, and it goes on top. Now I'd like that when I scroll the expanded cell which went to top to stay fixed there until it's closed. Can I do that?
In UITableView you have the UIScrollView methods. So you can do something like this:
-(void)scrollViewDidScroll:(UIScrollView *)scrollView {
UITableViewCell *cell =[self.myTableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:0]];
CGRect cellFrame = [cell convertRect:cell.frame toView:self.view];
if (self.isStickToTop) {
self.cell.frame = CGRectMake(0, 0, self.cellFrame.width, cellFrame.size.height);
}
else {
self.cell.frame = CGRectMake(0, scrollView.contentOffset.y, self.cellFrame.width, cellFrame.size.height);
}
}
The isStickToTop is your maintenance BOOLvariable that will indicate if the cell stick to top or not. Don't say u don't know ;)

setContentOffset not scrolling my UITableView

I am trying to scroll my UITableViewCell up one UITableViewCell position when the selected cell reaches the last position in the UITableView
I have the logic correct for identifying the last visible UItableViewCell of the UITableView. However the code to make the UITableView scroll up one position is not working. This is the code I have written.
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
cellSelectedBool = YES;
cell = (CustomFinishingCell *)[tableView cellForRowAtIndexPath:indexPath]; // error
[cell.widthTexField becomeFirstResponder];
// Gets an array of current visible cells in UITableView
NSArray *visibleCells = [tableView visibleCells];
NSLog(#"%#", visibleCells);
// get indexpath of last cell
UITableViewCell *lastCell = [visibleCells lastObject];
NSIndexPath *lastCellIndex = [finishingTableView indexPathForCell:lastCell];
// perform scroll when last visible cell is selected
if (indexPath.row == lastCellIndex.row) {
NSLog(#"BIGGER");
int cellHeight = 44;
[UIView animateWithDuration:.25 animations:^{
[finishingTableView setContentOffset:CGPointMake(finishingTableView.contentOffset.x,finishingTableView.contentOffset.y + cellHeight) animated:YES];
}];
}
you should use:
NSIndexPath *rowToSelect; // assume this exists and is set properly
UITableView *myTableView; // assume this exists
[myTableView selectRowAtIndexPath:rowToSelect animated:YES scrollPosition:UITableViewScrollPositionNone];
[myTableView scrollToRowAtIndexPath:rowToSelect atScrollPosition:UITableViewScrollPositionNone animated:YES];
if (indexPath.row == lastCellIndex.row) {
[finishingTableView scrollToRowAtIndexPath:indexPathatScrollPosition:
UITableViewScrollPositionNone animated:YES];
}

How can I get the height of a specific row in my UITableView

In my UITableView i've set different heights for different rows using the delegate method: tableView:heightForRowAtIndexPath:
Now given a NSIndexPath, I would like to get the height I've previously assigned for a specific row.
You can use this
CGRect frame = [tableView rectForRowAtIndexPath:indexPath];
NSLog(#"row height : %f", frame.size.height);
Using frame.size.height you can get height of particular row
Swift 3
let frame = tableView.rectForRow(at: indexPath)
print(frame.size.height)
Simplly Use
tableView:heightForRowAtIndexPath
method
int row = 1;
int section = 0;
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:row inSection:section];
float height = [self tableView:tableView heightForRowAtIndexPath:indexPath];
Hope this wil help for you :)
-(CGFloat)getHeightAtIndexPath:(NSIndexPath *)indexPath{
if(indexPath.row == 0)
return 20.0;
else if(indexPath.row == 4)
return 40.0;
return 50.0; //Default
}
Call the above function in tableView:heightForRowAtIndexPath: as
return [self getHeightAtIndexPath:indexPath];
And you can use the same function on say button click action of a button inside a specific cell, with having button.tag=indexPath.row
-(IBAction)btnClick:(id)sender{
UIButton *btn=(UIButton *)sender;
NSIndexPath *indexPath=[NSIndexPath indexPathForRow:btn.tag inSection:0];
CGFloat height=[self getHeightAtIndexPath:indexPath];
}
By using below code you can get the cell height from tableview
let height = super.tableView(tableView, heightForRowAt: indexPath)

Get position of cell or text field in this cell

I have a split view controller: view & tableview. In this table view I have custom cells with text field. I don't know how many cells will I have, so it generate automatically. And now I'm trying scroll to textfield, when it becomeFirstResponder. I've tried something like this:
-(void) textFieldDidBeginEditing:(UITextField *)textField {
CGPoint focusOnTextField = CGPointMake(0, 300 + textField.frame.origin.y);
[scroller setContentOffset: focusOnTextField animated: YES];
}
300px - start position of my TableView. All seems alright, but textField.frame.origin.y always equal to 0 (like and bounds.origin.y btw).
I thought I can solve a problem if get position of cell, which textfield is active, and then replace textField.frame.origin.y on cell.frame.origin.y or something like this.
===================================================================
I forgot say that my tableviews scroll is disabled. I follow your advices and code examples and solve it like that:
- (UITableViewCell *)cellWithSubview:(UIView *)subview {
while (subview && ![subview isKindOfClass:[UITableViewCell self]])
subview = subview.superview;
return (UITableViewCell *)subview;
}
- (void)textFieldDidBeginEditing:(UITextField *)textField {
UITableViewCell *activeCell = [self cellWithSubview:textField];
float offsetValueY = 200 + activeCell.origin.y;
CGPoint focusOnTextField = CGPointMake(0, offsetValueY);
[scroller setContentOffset:focusOnTextField animated:YES];
}
And know what? It's working! :-) But it create a new problem. When I begin editing textfield, scroller at first jump on top, and only then going to it correct position. When I write [scroller setContentOffset:focusOnTextField animated:NO]; and this problem disappear, but there is no smooth move of scroller. And this is bad to me :-) So how we can solve it?
Here's how to scroll to a cell containing a text field ...
// find the cell containing a subview. this works independently of how cells
// have been constructed.
- (UITableViewCell *)cellWithSubview:(UIView *)subview {
while (subview && ![subview isKindOfClass:[UITableViewCell self]])
subview = subview.superview;
return (UITableViewCell *)subview;
}
Your idea is correct to trigger that action when editing begins. Just do it using the cell...
- (void)textFieldDidBeginEditing:(UITextField *)textField {
// find the cell containing this text field
UITableViewCell *cell = [self cellWithSubview:textField];
// now scroll using that cell's index path as the target
NSIndexPath *indexPath = [self.tableView indexPathForCell:cell];
[self.tableView scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionTop animated:YES];
}
If you add the textfield in the UITableVieCell content view (added by default if you are using .xib) then you have to call something like textField.superview.superview and this will give you the parent cell. If you add the text field directly to the cell view then you have to textField.superview.
[tableView scrollToRowContainingComponent:textField atScrollPosition: UITableViewScrollPositionMiddle animated:YES];
after adding the following category to UITableView:
#implementation UITableView (MyCategory)
-(NSIndexPath*)indexPathOfCellComponent:(UIView*)component {
if([component isDescendantOfView:self] && component != self) {
CGPoint point = [component.superview convertPoint:component.center toView:self];
return [self indexPathForRowAtPoint:point];
}
else {
return nil;
}
}
-(void)scrollToRowContainingComponent:(UIView*)component atScrollPosition:(UITableViewScrollPosition)scrollPosition animated:(BOOL)animated {
NSIndexPath *indexPath = [self indexPathOfCellComponent:component];
if(indexPath) {
[self scrollToRowAtIndexPath:indexPath atScrollPosition: scrollPosition animated:animated];
}
}
#end

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