CODEWITHSUNDEEP
iosswiftuitableview
Abhinav
Abhinav

Reputation: 3428

Get height of each rows of UITableView

Is there any way by which I can get row height of each row in a UITableView. I have a UITableView which contains data which is dynamic, and I am using 

self.tableView.rowHeight = UITableViewAutomaticDimension

to make dynamic row heights.

But I want to change height of overall UITableView as well, for that I need height of all the rows after reload of data.

I tried using 

self.tableView.layoutIfNeeded()
self.tableViewHeightContraint.constant = self.tableView.contentSize.height

But due to unknown reason it is giving me height less than what exactly it has, after I add 3 or 4 records in UITableView so thinking of other way around. To calculate height of each rows and then summing them up.

I am doing in Xcode 7.2, iOS 9 and Swift 2

Upvotes: 1

Views: 6534

Answers (7)

Sentry.co
Sentry.co

Reputation: 5569

Functionally (one-liner) 👌

NOTE: my section array stores the rows in the .data var 

let heightOfAllRows:CGFloat = sections.enumerated().map { arg -> [(section:Int,row:Int)] in
            return arg.element.data.indices.map{ i in
                (section:arg.offset,row:i)
            }
        }.flatMap{$0}.reduce(0){
            return $0 + self.tableView(self, heightForRowAt: .init(row: $1.row, section: $1.section))
        }

Upvotes: 0

Rodolfo Teixeira
Rodolfo Teixeira

Reputation: 1

Maybe the table is not resizing its content, so if you try using [self. tableView layoutSubviews]; to force the resizing, it may work. [self. tableView layoutIfNeeded]; not necessarily forces the update.

Upvotes: 0

Pavan Sisode
Pavan Sisode

Reputation: 61

in Swift 3.0

let myRowHeight = yourTableView.rowHeight

Upvotes: 1

leonardloo
leonardloo

Reputation: 1803

This is because self.tableView.contentSize.height returns number of rows * estimatedRowHeight, which is not equivalent to actual height of the table view. What you need is to get the individual cell heights through visibleCells, then sum those up to get the table view's height.

Refer to this for the answer: https://stackoverflow.com/a/40081129/4076956

Upvotes: 0

Mr. Bean
Mr. Bean

Reputation: 4281

var dictionaryOfCellHeight = [Int : CGFloat]()
var dataArray = [String]()
func tableView(tableView: UITableView!, heightForRowAtIndexPath indexPath: NSIndexPath!) -> CGFloat {


    if dictionaryOfCellHeight[indexPath.row] == nil
    {
    var frame : CGRect = tableView.rectForRowAtIndexPath(indexPath)

        if indexPath.row == dataArray.count
        {

            dictionaryOfCellHeight[indexPath.row] = frame.size.height
            //calculate total height and reload table
        }
        else
        {
        dictionaryOfCellHeight[indexPath.row] = frame.size.height
        }

    }
}

Upvotes: 2

Mandeep Kumar
Mandeep Kumar

Reputation: 776

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

Upvotes: 0

Bharath Vankireddy
Bharath Vankireddy

Reputation: 932

To change the height of Tableview , you don't need to calculate the height of all UITableViewCells and set to TableView. Set the height of each UITableViewCell properly in heightForRowAtIndexPath method. This will automatically set the scrollable height to your Tableview

Upvotes: 0

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