Putting Tableview inside UITableViewCell Swift - swift

Question

I'm having trouble with putting a tableview inside a uitableview cell. Right now, it doesn't even display the nested tableview. I set the tableview's delegates and datasource to the custom cell, and have all the required methods. I am also using a storyboard for my tableviews, and have connected all outlets properly.
The problem is that it does not go into the cellForRow function. It does, however, go into the numberOfRowsInSection function, and also the heightForRow function. Below is the code for the custom cell that holds the nested UITableviewcell.
import UIKit
class EventSurveyCell: UITableViewCell, UITableViewDelegate, UITableViewDataSource {
#IBOutlet weak var cellBox: UIView!
#IBOutlet weak var announcementLabel: UILabel!
#IBOutlet weak var descriptionLabel: UILabel!
#IBOutlet weak var dateLabel: UILabel!
#IBOutlet weak var authorLabel: UILabel!
#IBOutlet weak var numVotesLabel: UILabel!
#IBOutlet weak var tableView: UITableView!
var surveyArray: [SurveyClass] = []
override func awakeFromNib() {
super.awakeFromNib()
tableView.delegate = self
tableView.dataSource = self
// Initialization code
}
override func setSelected(selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
tableView.delegate = self
tableView.dataSource = self
// Configure the view for the selected state
}
func do_table_refresh()
{
dispatch_async(dispatch_get_main_queue(), {
self.tableView.reloadData()
return
})
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
print("cellforrow")
let cell: SurveyItemCell = self.tableView.dequeueReusableCellWithIdentifier("surveyItemCell") as! SurveyItemCell!
cell.itemLabel.text = surveyArray[indexPath.row].itemName
//go through firebase to check which one user voted on
cell.voteButton.imageView!.image = UIImage(named: "circle")
let percent = surveyArray[indexPath.row].numOfVotes/surveyArray[indexPath.row].totalNumOfVotes
cell.precentLabel.text = String(percent)
return cell
}
func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
print("heightforrow")
return 44
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
print("numrowsinsection")
return 3
//should be return self.surveyArray.count.
}
}
Below is a snippet of code for in the the viewcontroller that is holding the custom cells (containing nested tableviews). This code is part of the cellforrowatindexpath
case PostType.survey:
let cell: EventSurveyCell = self.tableView.dequeueReusableCellWithIdentifier("EventSurveyCell") as! EventSurveyCell!
//cut out other code as it is irrelevant
cell.surveyArray = eventPost.surveyClassArray
cell.do_table_refresh()
print(cell.tableView.rowHeight)
return cell
Another problem I have noticed is that when printing cell.tableview.rowheight, it prints -1. This could be the reason why it does not enter cellforrowatindexpath, but I clearly return 44 in the heightforrow function. Right now, it doesnt even display the nested tableview.

Answer 1

1) Don't need do_table_refresh, you can call cell.tableView.reloadData() directly.
2) Override the systemLayoutSizeFitting:withHorizontalFittingPriority:verticalFittingPriority function:
override func systemLayoutSizeFitting(_ targetSize: CGSize, withHorizontalFittingPriority horizontalFittingPriority: UILayoutPriority, verticalFittingPriority: UILayoutPriority) -> CGSize {
tableView.reloadData()
// if the table view is the last UI element, you might need to adjust the height
let size = CGSize(width: targetSize.width,
height: tableView.frame.origin.y + tableView.contentSize.height)
return size
}
3) In your view controller, after you set the surveyArray, remove this line cell.do_table_refresh(), replace with cell.setNeedsLayout() to auto adjust the layout (you might also need to call a method to update the other UIs such as announcementLabel etc. call it before setNeedsLayout too.)

Answer 2

I had the same issue, cellForRow was not being called for the TableView Inside Custom Cell. And the reason was that the tableview had no height set for it to show the content inside it. After I set some height for the child TableView, cellForRow started to begin calling.