Text getting overlapped in uitableview cells in iOS swift - ios

Question

I have created a prototype UITableViewCell on storyboard.It contains 1 ImageView, 3 labels to display the content. All the controls have outlets in corresponding subclass of UITableViewCell. I display messages which can be multi line. So I had to add following methods
func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
return UITableViewAutomaticDimension
}
func tableView(tableView: UITableView, estimatedHeightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
return UITableViewAutomaticDimension
}
The text of the labels is getting overlapped and it happens whenever I scroll the tableview. It is only happening with either first 2 rows or the last row.But as i searched on google, I found that it can happen on any row any time. Here's my code of the extension which is commonly written.
extension ConversationViewController: UITableViewDataSource, UITableViewDelegate {
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if let count = selectedConversation?.msgArrayWithBodyText.count {
return count
}
return 0
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier(conversationMessageIdentifier, forIndexPath: indexPath) as! ConversationMessageTableViewCell
let currMsg = selectedConversation.msgArrayWithBodyText[indexPath.row]
cell.userFullNameLabel.text = currMsg.senderName
cell.dateLabel.text = selectedConversation.getShortDateForMessage(currMsg.timeSent)
cell.messageBodyLabel.text = currMsg.bodyText //Constants.testString
let imageUrl = "\(Constants.serverUrl)/api/users/\(currMsg.senderId)/profilePicture"
if let item = ImageCache.sharedInstance.objectForKey(imageUrl) as? CacheableItem {
print("\(imageUrl) found in cache, expiresAt: \(item.expiresAt)")
cell.userImageView.image = UIImage(data: item)
} else {
cell.userImageView.image = UIImage(named: "Profile")
self.imageDownLoadingQueue.addOperationWithBlock({
if let url = NSURL(string: imageUrl) {
if let purgableData = NSPurgeableData(contentsOfURL: url) {
if let downloadedImage = UIImage(data: purgableData) {
print("cache: \(imageUrl)")
let item = CacheableItem()
item.setData(purgableData)
ImageCache.sharedInstance.setObject(item, forKey: imageUrl)
NSOperationQueue.mainQueue().addOperationWithBlock({
if let updateCell = tableView.cellForRowAtIndexPath(indexPath) as? ConversationMessageTableViewCell {
updateCell.userImageView.image = downloadedImage
}
})
}
}
}
})
}
//cell.clipsToBounds = true
return cell
}
func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
return UITableViewAutomaticDimension
}
func tableView(tableView: UITableView, estimatedHeightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
return UITableViewAutomaticDimension
}
func tableView(tableView: UITableView, willDisplayCell cell: UITableViewCell, forRowAtIndexPath indexPath: NSIndexPath) {
if cell.respondsToSelector(Selector("setSeparatorInset:")) {
cell.separatorInset = UIEdgeInsetsZero
}
if cell.respondsToSelector(Selector("setLayoutMargins:")) {
cell.layoutMargins = UIEdgeInsetsZero
}
if cell.respondsToSelector(Selector("setPreservesSuperviewLayoutMargins:")) {
cell.preservesSuperviewLayoutMargins = false
}
cell.backgroundColor = UIColor.clearColor()
cell.backgroundView = UIView(frame:cell.frame)
if(cell.backgroundView?.layer.sublayers?.count > 1){
cell.backgroundView?.layer.sublayers?.removeAtIndex(0)
}
let layer = self.getGradientLayer(indexPath.row)
cell.backgroundView?.layer.insertSublayer(layer, atIndex: 0)
}
}
And here's the subclass of UITableViewCell i have written for the protyped cell.
class ConversationMessageTableViewCell: UITableViewCell {
#IBOutlet weak var userImageView: UIImageView!
#IBOutlet weak var dateLabel: UILabel!
#IBOutlet weak var userFullNameLabel: UILabel!
#IBOutlet weak var messageBodyLabel: UILabel!
#IBOutlet weak var messageBodyLabelHeightConstraint: NSLayoutConstraint!
override func awakeFromNib() {
super.awakeFromNib()
// Initialization code
userImageView.layer.borderColor = UIColor.clearColor().CGColor
userImageView.layer.borderWidth = 1.0
userImageView.layer.cornerRadius = (userImageView.frame.height/2)
userImageView.clipsToBounds = true
}
override func setSelected(selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
// Configure the view for the selected state
}
Here's the edited screen shot (I have blackened out the name and faces)
Help required!
I can see long text not getting messed up,but it only happens with small texts.
Basically, this only happens when i scroll the tableview up and down few times. All the text is displayed properly when tableview loads, but then messes up and then clears out for a while and again messes up.

Answer 1

I found the solution to this problem.
There is an option in story board which says Clear Graphics Context which basically clears the graphics for the label before redrawing it.