how to obtain the UITableViewCell within heightForRowAtIndexPath?

Question

How does one obtain the UITableViewCell when within the heightForRowAtIndexPath method, i.e. given the indexPath?

(then I could access the

Answer 1

This question has no sense because in

heightForRowAtIndexPath

no cells are created yet. Here's how tableView works:

1. TableView asks it's datasource how many sections it will have. -numberOfSectionsInTableView
2. Asks it's datasource how many rows each section will have (to know how big scroller should be etc.) -numberOfRowsInSection
3. Asks it's delegate height of each visible row. To know where cells will be located. - heightForRowAtIndexPath
4. Lastly it asks datasource to give it a cell to display at given index path -cellForRowAtIndexPath

So you can't access to cells from heightForRowAtIndexPath because with a most likely cell is not created yet.

---

However in case I misunderstood your question go try:

UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];

Answer 2

i would suggest you to calculate the correct height of a row in table:heightForRowAtIndexPath: by using your data structure (Height of text,images,mutliline text etc..).

And change the component height in their -(void) layoutSubviews method.

Answer 3

The obvious answer is to call cellForRowAtIndexPath, but you may have already discovered there are some issues with that. See this question if you haven't already: UITableView flexible/dynamic heightForRowAtIndexPath

For my last project I used a custom subclass of UICell and implemented a method like this. I then called this from table:heightForRowAtIndexPath: (after looking up the content for that row).

+ (CGFloat) heightOfContent: (NSString *)content
{
    CGFloat contentHeight = 
           [content sizeWithFont: DefaultContentLabelFont
               constrainedToSize: CGSizeMake( DefaultCellSize.width, DefaultContentLabelHeight * DefaultContentLabelNumberOfLines )
                   lineBreakMode: UILineBreakModeWordWrap].height;
    return contentHeight + DefaultCellPaddingHeight;
}

Answer 4

For iOS8:

override func viewDidLoad() {
        super.viewDidLoad()

        self.tableView.estimatedRowHeight = 80
        self.tableView.rowHeight = UITableViewAutomaticDimension
    }

OR

func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
            return UITableViewAutomaticDimension

    }

But for iOS7, the key is calculate the height after autolayout,

func calculateHeightForConfiguredSizingCell(cell: GSTableViewCell) -> CGFloat {
        cell.setNeedsLayout()
        cell.layoutIfNeeded()
        let height = cell.contentView.systemLayoutSizeFittingSize(UILayoutFittingExpandedSize).height + 1.0
        return height

    }

Note:

1) If multiple lines labels, don't forget set the numberOfLines to 0.

2) Don't forget label.preferredMaxLayoutWidth = CGRectGetWidth(tableView.bounds)

Answer 5

You can use the tableview's delegate instead of the tableView itself.

id cell = [self tableView:tableView cellForRowAtIndexPath:indexPath];

Check the answer here

UPDATED

In new iOS versions and using correct auto constraints you don't need to reference the cell anymore to calculate the cell's height.

Check here

https://www.raywenderlich.com/129059/self-sizing-table-view-cells

Answer 6

If you want to access the cells use tags. But as @Jhaliya has said it is better to calculate the height based on the content of the cell. If your regard is with the position of the cell then I would suggest you to use scroll view and implement the cells yourself wherever you want.