uicollectionviewcell labels misaligned after reload - ios

Question

I tried following code to render simple collection view on screen.
But subviews in contentview do not algin properly
I am coding in swift 2.3 with Xcode 7.3.1
Whys is this happening?
Here is the code
import Foundation
class CustomerOverdueViewController : BaseViewController , UICollectionViewDelegateFlowLayout {
#IBOutlet weak var collectionView: UICollectionView!
#IBOutlet weak var tableView: UITableView!
#IBOutlet weak var lblTotalOverdue: UILabel!
#IBOutlet weak var lblInvestedFunds: UILabel!
#IBOutlet weak var segmentedControl: UISegmentedControl!
var rangeArray = NSArray()
var selectedOverdueIndex = 0
var selectedColor = UIColor()
override func viewDidLoad() {
super.viewDidLoad()
self.title = "Customer Overdue"
}
#IBAction func segValueChanged(sender: UISegmentedControl) {
}
func numberOfSectionsInCollectionView(collectionView: UICollectionView) -> Int {
return 1
}
func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 6
}
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
let reuseIdentifier = String("CustomerOverdueCollectionViewCell")
let cell = collectionView.dequeueReusableCellWithReuseIdentifier(reuseIdentifier, forIndexPath: indexPath) as! CustomerOverdueCollectionViewCell
return cell
}
func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath){
}
func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize
{
return CGSize(width: collectionView.frame.size.width/2 - 10, height: collectionView.frame.size.height/3 - 10)
}
func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAtIndex section: Int) -> UIEdgeInsets
{
return UIEdgeInsets(top: 5, left: 5, bottom: 0, right: 5)
}
func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAtIndex section: Int) -> CGFloat
{
return 10.0
}
func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAtIndex section: Int) -> CGFloat
{
return 10.0
}
}

Answer 1

Finally I got the solution
Override layoutSubviews in Custom Cell
override func layoutSubviews() {
super.layoutSubviews()
self.layoutIfNeeded()
}
and add following lines in cellForItemAtIndexpath
cell.setNeedsLayout()
cell.layoutIfNeeded()

Answer 2

It seems that in the initial call the data is used when the table is first drawn (from ViewWillLoad). However when you refresh the data, the constraints are not recalculated.
Normally this is done via setNeedsLayout and/or layoutIfNeeded
You can try:
[view layoutIfNeeded];