Dynamically resizing collection view cell - ios

Question

I have this older code example that I updated but I am still a newbie and can't figure out how to fix this one error:
In the class that holds the collection view:
var array = ["Just testing this out"]
Now in the UICollectionViewDelegateFlowLayout extension:
private func estimateFrameForText(text: String) -> CGRect {
//we make the height arbitrarily large so we don't undershoot height in calculation
let height: CGFloat = 1000
let size = CGSize(width: 398, height: height)
let options = NSStringDrawingOptions.usesFontLeading.union(.usesLineFragmentOrigin)
let attributes = [NSAttributedString.Key.font: UIFont.systemFont(ofSize: 17, weight: UIFont.Weight.light)]
return NSString(string: text).boundingRect(with: size, options: options, attributes: attributes, context: nil)
}
Also:
private func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize {
var height: CGFloat = 295
//we are just measuring height so we add a padding constant to give the label some room to breathe!
var padding: CGFloat = 14
//estimate each cell's height
if let text = array[indexPath.item].text {
height = estimateFrameForText(text).height + padding
}
return CGSize(width: 398, height: height) }
This is where I get the error:
if let text = array[indexPath.item].text
And here's the UILabel from the collection view cell class I have no idea where to implement:
#IBOutlet weak var TextPosted: UILabel!

Answer 1

Your test array needs some adjusting. Try declaring it as an optional (since it likely will be with actual data loaded from somewhere).
var array: [String]? = ["Just testing this out", "Another test"]
Then this:
override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return array?.count ?? 0
}
Then update your if let statement in your collecitonView sizeForItemAtIndexPath function:
if let text = array?[indexPath.item]{
}
On a side note, I wrote an open-source extension to measure string size for things like this a few days ago.
Hope this helps.