Access CollectionView Cell Content (change width of inner view) - swift

Question

I want to have a uiview as cell background with changing width. This should be used as a progress-/ statusbar.
The problem:
I can’t change the width of the statusbar from my collectionViewController (only from the CollectionViewCellController)....
I manually set the width to 5 in layoutSubviews(). Then I changed it to 80 in setStatusBar(...) which I called in the other class. The width stays at 5 :(
Here is my code
import UIKit
class MyCollectionViewCell: UICollectionViewCell {
#IBOutlet weak var myLabel: UILabel!
#IBOutlet weak var statusbar: UIView!
override func layoutSubviews() {
// cell rounded section
self.layer.cornerRadius = 15.0
self.layer.masksToBounds = true
super.layoutSubviews()
statusbar.frame = CGRect(x: 0, y: 0, width: 5, height: self.frame.height)
}
}
extension MyCollectionViewCell{
func setStatusbar(completedTasks: Int, totalTasks: Int){
print(self.frame.width)
let newWidth = 80 //(self.frame.width * (CGFloat(completedTasks / totalTasks)))
statusbar.backgroundColor = .orange
statusbar.frame = CGRect(x: 0, y: 0, width: newWidth, height: Int(self.frame.height))
reloadInputViews()
}
}
And this is where I call the function setStatusbar(...) - where I want to change the width, but DOESNT work:
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
// get a reference to our storyboard cell
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: reuseIdentifier, for: indexPath as IndexPath) as! MyCollectionViewCell
// Use the outlet in our custom class to get a reference to the UILabel in the cell
cell.myLabel.text = self.items[indexPath.row] // The row value is the same as the index of the desired text within the array.
cell.backgroundColor = UIColor(rgb: 0xF444444)
cell.setStatusbar(completedTasks: 5, totalTasks: 25) //!!! HERE !!!
return cell
}
Can someone help me find the problem why the statusbar uiview doesn’t change its with from 5 to 80?
Thank you!