UITableView returns blank cells - ios

Question

I have a table view with height of cells set to automatic.
Once in a few runs, a few cells in the table are displayed empty (white space). Upon debugging, I noticed that the 'cellForRowAtIndexPath' function returns these cells as usual. Also, every time this bug shows up, the console has this message:
"Warning once only: Detected a case where constraints ambiguously suggest a height of zero for a tableview cell's content view. We're considering the collapse unintentional and using standard height instead."
Scrolling up and down a couple of times fixes the issue and cells are displayed.
I use this following functions for height:
override func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
return UITableViewAutomaticDimension
}
override func tableView(tableView: UITableView, estimatedHeightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
return UITableViewAutomaticDimension
}
I have been stuck with this for a week and any help would be greatly appreciated!
Edit: Code for the cells:
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return posts.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
var row = indexPath.row
tableView.allowsSelection = false;
let cellIdentifier = "testTableViewCell"
let cell = tableView.dequeueReusableCellWithIdentifier(cellIdentifier, forIndexPath: indexPath) as! testTableViewCell
let post: PostMdl!
if(row < posts.count) {
post = posts[row]
}
else {
return cell
}
cell.label.delegate = self
cell.label.enabledTextCheckingTypes = NSTextCheckingType.Link.rawValue
cell.label.userInteractionEnabled = true
cell.brandName.text = post.brandName
cell.timeStamp.text = post.timeStamp
cell.brandImg.sd_setImageWithURL(post.brandImgUrl, placeholderImage: UIImage(named: "placeHolder"))
if let img = post.postImg {
cell.mainImg.image = img
} else {
cell.mainImg.image = UIImage(named:"lazyLoad")
}
cell.label.text = post.postTag
cell.labelDistanceFromImg.constant = 30
cell.labelDistanceToBtm.constant = 30
cell.postTag = post.postTag
cell.socNtwkImg.image = UIImage(named: post.socNtwk)
return cell
}

Answer 1

I guess you had set wrong constraints to subviews of UITableViewCell.contentView.
This image shows what I reproduce your error:
Please note the right constaints of red view, it just has Top Left Right Height, lacks bottom constraint, when I add it and it looks good:
Yes, there still have problem that Unable to simultaneously satisfy constraints, we can modify the priority of height constraint, default priority is required(1000), we change to Hight(750), it works!
I don't know your cell's detail, but the error's reason is likely, hope my answer helps you.
Append codes
class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
#IBOutlet var tableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 10
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
return tableView.dequeueReusableCellWithIdentifier("cell")!;
}
func tableView(tableView: UITableView, estimatedHeightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
return UITableViewAutomaticDimension
}
func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
return UITableViewAutomaticDimension
}
}

Answer 2

What is your mobile phone version of the iOS?
In the previous iOS8 version I also encountered similar problems.
My method is as follows:
tableView.estimatedRowHeight = 88.0
tableView.rowHeight = UITableViewAutomaticDimension
Hope can help you