Can you animate a height change on a UITableViewCell when selected?

IosCocoa TouchUitableview

Ios Problem Overview

I'm using a UITableView in my iPhone app, and I have a list of people that belong to a group. I would like it so that when the user clicks on a particular person (thus selecting the cell), the cell grows in height to display several UI controls for editing the properties of that person.

Is this possible?

Ios Solutions

Solution 1 - Ios

I found a REALLY SIMPLE solution to this as a side-effect to a UITableView I was working on.....

Store the cell height in a variable that reports the original height normally via the tableView: heightForRowAtIndexPath:, then when you want to animate a height change, simply change the value of the variable and call this...

[tableView beginUpdates];
[tableView endUpdates];

You will find it doesn't do a full reload but is enough for the UITableView to know it has to redraw the cells, grabbing the new height value for the cell.... and guess what? It ANIMATES the change for you. Sweet.

I have a more detailed explanation and full code samples on my blog... Animate UITableView Cell Height Change

Solution 2 - Ios

I like the answer by Simon Lee. I didn't actually try that method but it looks like it would change the size of all the cells in the list. I was hoping for a change of just the cell that is tapped. I kinda did it like Simon but with just a little difference. This will change the look of a cell when it is selected. And it does animate. Just another way to do it.

Create an int to hold a value for the current selected cell index:

int currentSelection;

Then:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    int row = [indexPath row];
    selectedNumber = row;
    [tableView beginUpdates];
    [tableView endUpdates];
}

Then:

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
    
    if ([indexPath row] == currentSelection) {
        return  80;
    }
    else return 40;
	
    
}

I am sure you can make similar changes in tableView:cellForRowAtIndexPath: to change the type of cell or even load a xib file for the cell.

Like this, the currentSelection will start at 0. You would need to make adjustments if you didn't want the first cell of the list (at index 0) to look selected by default.

Solution 3 - Ios

Add a property to keep track of the selected cell

@property (nonatomic) int currentSelection;

Set it to a sentinel value in (for example) viewDidLoad, to make sure that the UITableView starts in the 'normal' position

- (void)viewDidLoad
{
    [super viewDidLoad];
	// Do any additional setup after loading the view.

    //sentinel
    self.currentSelection = -1;
}

In heightForRowAtIndexPath you can set the height you want for the selected cell

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
    int rowHeight;
    if ([indexPath row] == self.currentSelection) {
        rowHeight = self.newCellHeight;
    } else rowHeight = 57.0f;
    return rowHeight;
}

In didSelectRowAtIndexPath you save the current selection and save a dynamic height, if required

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
        // do things with your cell here
        
        // set selection
        self.currentSelection = indexPath.row;
        // save height for full text label
        self.newCellHeight = cell.titleLbl.frame.size.height + cell.descriptionLbl.frame.size.height + 10;
        
        // animate
        [tableView beginUpdates];
        [tableView endUpdates];
    }
}

In didDeselectRowAtIndexPath set the selection index back to the sentinel value and animate the cell back to normal form

- (void)tableView:(UITableView *)tableView didDeselectRowAtIndexPath:(NSIndexPath *)indexPath {       
        // do things with your cell here

        // sentinel
        self.currentSelection = -1;
        
        // animate
        [tableView beginUpdates];
        [tableView endUpdates];
    }
}

Solution 4 - Ios

Instead of beginUpdates()/endUpdates(), the recommended call is now:

tableView.performBatchUpdates(nil, completion: nil)

Apple says, regarding beginUpdates/endUpdates: "Use the performBatchUpdates(_:completion:) method instead of this one whenever possible."

See: https://developer.apple.com/documentation/uikit/uitableview/1614908-beginupdates

Solution 5 - Ios

reloadData is no good because there's no animation...

This is what I'm currently trying:

NSArray* paths = [NSArray arrayWithObject:[NSIndexPath indexPathForRow:0 inSection:0]];
[self.tableView beginUpdates];
[self.tableView insertRowsAtIndexPaths:paths withRowAnimation:UITableViewRowAnimationFade];
[self.tableView deleteRowsAtIndexPaths:paths withRowAnimation:UITableViewRowAnimationFade];
[self.tableView endUpdates];

It almost works right. Almost. I'm increasing the height of the cell, and sometimes there's a little "hiccup" in the table view as the cell is replaced, as if some scrolling position in the table view is being preserved, the new cell (which is the first cell in the table) ends up with its offset too high, and the scrollview bounces to reposition it.

Solution 6 - Ios

I don't know what all this stuff about calling beginUpdates/endUpdates in succession is, you can just use -[UITableView reloadRowsAtIndexPaths:withAnimation:]. Here is an example project.

Solution 7 - Ios

I resolved with reloadRowsAtIndexPaths.

I save in didSelectRowAtIndexPath the indexPath of cell selected and call reloadRowsAtIndexPaths at the end (you can send NSMutableArray for list of element's you want reload).

In heightForRowAtIndexPath you can check if indexPath is in the list or not of expandIndexPath cell's and send height.

You can check this basic example: https://github.com/ferminhg/iOS-Examples/tree/master/iOS-UITableView-Cell-Height-Change/celdascambiadetam It's a simple solution.

i add a sort of code if help you

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return 20;
}

-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath: (NSIndexPath*)indexPath
{
    if ([indexPath isEqual:_expandIndexPath])
        return 80;
    
    return 40;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *CellIdentifier = @"Celda";
    
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    
    [cell.textLabel setText:@"wopwop"];
    
    return cell;
}

#pragma mark -
#pragma mark Tableview Delegate Methods

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    NSMutableArray *modifiedRows = [NSMutableArray array];
    // Deselect cell
    [tableView deselectRowAtIndexPath:indexPath animated:TRUE];
    _expandIndexPath = indexPath;
    [modifiedRows addObject:indexPath];
    
    // This will animate updating the row sizes
    [tableView reloadRowsAtIndexPaths:modifiedRows withRowAnimation:UITableViewRowAnimationAutomatic];
}

Solution 8 - Ios

Swift 4 and Above

add below code into you tableview's didselect row delegate method

tableView.beginUpdates()
tableView.setNeedsLayout()
tableView.endUpdates()

Solution 9 - Ios

Try this is for expanding indexwise row:

@property (nonatomic) NSIndexPath *expandIndexPath;
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath*)indexPath
{
if ([indexPath isEqual:self.expandedIndexPath])
    return 100;

return 44;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
NSMutableArray *modifiedRows = [NSMutableArray array];
if ([indexPath isEqual:self.expandIndexPath]) {
    [modifiedRows addObject:self.expandIndexPath];
    self.expandIndexPath = nil;
} else {
    if (self.expandedIndexPath)
        [modifiedRows addObject:self.expandIndexPath];
    
    self.expandIndexPath = indexPath;
    [modifiedRows addObject:indexPath];
}

// This will animate updating the row sizes
[tableView reloadRowsAtIndexPaths:modifiedRows withRowAnimation:UITableViewRowAnimationAutomatic];

// Preserve the deselection animation (if desired)
[tableView selectRowAtIndexPath:indexPath animated:NO scrollPosition:UITableViewScrollPositionNone];
[tableView deselectRowAtIndexPath:indexPath animated:YES];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:ViewControllerCellReuseIdentifier];
    cell.textLabel.text = [NSString stringWithFormat:@"I'm cell %ld:%ld", (long)indexPath.section, (long)indexPath.row];

return cell;
}

Solution 10 - Ios

BOOL flag;

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    flag = !flag;
    [tableView beginUpdates];
    [tableView reloadRowsAtIndexPaths:@[indexPath] 
                     withRowAnimation:UITableViewRowAnimationAutomatic];
    [tableView endUpdates];
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return YES == flag ? 20 : 40;
}

Solution 11 - Ios

just a note for someone like me searching for add "More Details" on custom cell.

[tableView beginUpdates];
[tableView endUpdates];

Did a excellent work, but don't forget to "crop" cell view. From Interface Builder select your Cell -> Content View -> from Property Inspector select "Clip subview"

Solution 12 - Ios

Heres a shorter version of Simons answer for Swift 3. Also allows for toggling of the cell's selection

var cellIsSelected: IndexPath?


  func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    cellIsSelected = cellIsSelected == indexPath ? nil : indexPath
    tableView.beginUpdates()
    tableView.endUpdates()
  }

  
  func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
    if cellIsSelected == indexPath {
      return 250
    }
    return 65
  }

Solution 13 - Ios

Swift Version of Simon Lee's answer .

// MARK: - Variables 
  var isCcBccSelected = false // To toggle Bcc.



    // MARK: UITableViewDelegate
func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
    
    // Hide the Bcc Text Field , until CC gets focused in didSelectRowAtIndexPath()
    if self.cellTypes[indexPath.row] == CellType.Bcc {
        if (isCcBccSelected) {
            return 44
        } else {
            return 0
        }
    }
    
    return 44.0
}

Then in didSelectRowAtIndexPath()

  func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
    self.tableView.deselectRowAtIndexPath(indexPath, animated: true)
    
    // To Get the Focus of CC, so that we can expand Bcc
    if self.cellTypes[indexPath.row] == CellType.Cc {
        
        if let cell = tableView.cellForRowAtIndexPath(indexPath) as? RecipientTableViewCell {
        
            if cell.tag == 1 {
                cell.recipientTypeLabel.text = "Cc:"
                cell.recipientTextField.userInteractionEnabled = true
                cell.recipientTextField.becomeFirstResponder()

                isCcBccSelected = true

                tableView.beginUpdates()
                tableView.endUpdates()
            }
        }
    }
}

Solution 14 - Ios

Yes It's Possible.

UITableView has a delegate method didSelectRowAtIndexPath

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    [UIView animateWithDuration:.6
                          delay:0
         usingSpringWithDamping:UIViewAnimationOptionBeginFromCurrentState
          initialSpringVelocity:0
                        options:UIViewAnimationOptionBeginFromCurrentState animations:^{
                          
                            cellindex = [NSIndexPath indexPathForRow:indexPath.row inSection:indexPath.section];
                            NSArray* indexArray = [NSArray arrayWithObjects:indexPath, nil];
                            [violatedTableView beginUpdates];
                            [violatedTableView reloadRowsAtIndexPaths:indexArray withRowAnimation:UITableViewRowAnimationAutomatic];
                            [violatedTableView endUpdates];
                        }
                     completion:^(BOOL finished) {
    }];
}

But in your case if the user scrolls and selects a different cell then u need to have the last selected cell to shrink and expand the currently selected cell reloadRowsAtIndexPaths: calls heightForRowAtIndexPath: so handle accordingly.

Solution 15 - Ios

Here is my code of custom UITableView subclass, which expand UITextView at the table cell, without reloading (and lost keyboard focus):

- (void)textViewDidChange:(UITextView *)textView {
	CGFloat textHeight = [textView sizeThatFits:CGSizeMake(self.width, MAXFLOAT)].height;
	// Check, if text height changed
	if (self.previousTextHeight != textHeight && self.previousTextHeight > 0) {
		[self beginUpdates];

		// Calculate difference in height
		CGFloat difference = textHeight - self.previousTextHeight;

		// Update currently editing cell's height
		CGRect editingCellFrame = self.editingCell.frame;
		editingCellFrame.size.height += difference;
		self.editingCell.frame = editingCellFrame;

		// Update UITableView contentSize
		self.contentSize = CGSizeMake(self.contentSize.width, self.contentSize.height + difference);

		// Scroll to bottom if cell is at the end of the table
		if (self.editingNoteInEndOfTable) {
			self.contentOffset = CGPointMake(self.contentOffset.x, self.contentOffset.y + difference);
		} else {
			// Update all next to editing cells
			NSInteger editingCellIndex = [self.visibleCells indexOfObject:self.editingCell];
			for (NSInteger i = editingCellIndex; i < self.visibleCells.count; i++) {
				UITableViewCell *cell = self.visibleCells[i];
				CGRect cellFrame = cell.frame;
				cellFrame.origin.y += difference;
				cell.frame = cellFrame;
			}
		}
		[self endUpdates];
	}
	self.previousTextHeight = textHeight;
}

Solution 16 - Ios

I used @Joy's awesome answer, and it worked perfectly with ios 8.4 and XCode 7.1.1.

In case you are looking to make your cell toggle-able, I changed the -tableViewDidSelect to the following:

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
//This is the bit I changed, so that if tapped once on the cell, 
//cell is expanded. If tapped again on the same cell, 
//cell is collapsed. 
    if (self.currentSelection==indexPath.row) {
        self.currentSelection = -1;
    }else{
        self.currentSelection = indexPath.row;
    }
        // animate
        [tableView beginUpdates];
        [tableView endUpdates];

}

I hope any of this helped you.

Solution 17 - Ios

Check this method after iOS 7 and later.

- (CGFloat)tableView:(UITableView *)tableView estimatedHeightForRowAtIndexPath:(NSIndexPath *)indexPath{
    return UITableViewAutomaticDimension;
}

Improvements have been made to this in iOS 8. We can set it as property of the table view itself.

Solution 18 - Ios

Swift version of Simon Lee's answer:

tableView.beginUpdates()
tableView.endUpdates()

Keep in mind that you should modify the height properties BEFORE endUpdates().

Solution 19 - Ios

Inputs -

tableView.beginUpdates() tableView.endUpdates() these functions will not call

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {}

But, if you do, tableView.reloadRows(at: [selectedIndexPath! as IndexPath], with: .none)

It will call the func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {} this function.

Solution 20 - Ios

I just resolved this problem with a little hack:

static int s_CellHeight = 30;
static int s_CellHeightEditing = 60;

- (void)onTimer {
	cellHeight++;
	[tableView reloadData];
	if (cellHeight < s_CellHeightEditing)
		heightAnimationTimer = [[NSTimer scheduledTimerWithTimeInterval:0.001 target:self selector:@selector(onTimer) userInfo:nil repeats:NO] retain];
}

- (CGFloat)tableView:(UITableView *)_tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
		if (isInEdit) {
			return cellHeight;
		}
		cellHeight = s_CellHeight;
		return s_CellHeight;
}

When I need to expand the cell height I set isInEdit = YES and call the method [self onTimer] and it animates the cell growth until it reach the s_CellHeightEditing value :-)

Solution 21 - Ios

Get the indexpath of the row selected. Reload the table. In the heightForRowAtIndexPath method of UITableViewDelegate, set the height of the row selected to a different height and for the others return the normal row height

Categories
Recommended Ios Solutions
Recommended Cocoa Touch Solutions
Recommended Uitableview Solutions

Previous Solution:

System.currentTimeMillis vs System.nanoTime

JavaTimerTime Precision

Next Solution:

What's the difference between the various methods to get an Android Context?

AndroidAndroid Context

Attributions

All content for this solution is sourced from the original question on Stackoverflow.

The content on this page is licensed under the Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) license.

Content TypeOriginal AuthorOriginal Content on Stackoverflow
QuestionTedView Question on Stackoverflow
Solution 1 - IosSimon LeeView Answer on Stackoverflow
Solution 2 - IosMark A.View Answer on Stackoverflow
Solution 3 - IosJoyView Answer on Stackoverflow
Solution 4 - IosrafView Answer on Stackoverflow
Solution 5 - IoslawrenceView Answer on Stackoverflow
Solution 6 - IosaxiixcView Answer on Stackoverflow
Solution 7 - IosferminView Answer on Stackoverflow
Solution 8 - Iosmidhun pView Answer on Stackoverflow
Solution 9 - IosNagarjunView Answer on Stackoverflow
Solution 10 - IosRoman SolodyashkinView Answer on Stackoverflow
Solution 11 - IosAnthony MarchenkoView Answer on Stackoverflow
Solution 12 - IosaBikisView Answer on Stackoverflow
Solution 13 - IosiooplView Answer on Stackoverflow
Solution 14 - IosKoushikView Answer on Stackoverflow
Solution 15 - IosVitalii GozhenkoView Answer on Stackoverflow
Solution 16 - IosSeptronicView Answer on Stackoverflow
Solution 17 - IosGovindView Answer on Stackoverflow
Solution 18 - IosTamás SengelView Answer on Stackoverflow
Solution 19 - IossRoyView Answer on Stackoverflow
Solution 20 - IosDzamirView Answer on Stackoverflow
Solution 21 - IoslostInTransitView Answer on Stackoverflow