CollectionView Dynamic cell height swift

Question

Im trying to create a collection view with cells displaying string with variable length.

Im using this function to set cell layout:

 func collectionV         


        

Answer 1

While the answer above may solve your problem, it establishes a pretty crude way of assigning each cells height. You are being forced to hard code each cell height based on some estimation. A better way of handling this issue is by setting the height of each cell in the collectionview's sizeForItemAtIndexPath delegate method.

I will walk you through the steps on how to do this below.

Step 1: Make your class extend UICollectionViewDelegateFlowLayout

Step 2: Create a function to estimate the size of your text: This method will return a height value that will fit your string!

private func estimateFrameForText(text: String) -> CGRect {
    //we make the height arbitrarily large so we don't undershoot height in calculation
    let height: CGFloat = 

    let size = CGSize(width: yourDesiredWidth, height: height)
    let options = NSStringDrawingOptions.UsesFontLeading.union(.UsesLineFragmentOrigin)
    let attributes = [NSFontAttributeName: UIFont.systemFontOfSize(18, weight: UIFontWeightLight)]

    return NSString(string: text).boundingRectWithSize(size, options: options, attributes: attributes, context: nil)
}

Step 3: Use or override delegate method below:

func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize {
    var height: CGFloat = 

   //we are just measuring height so we add a padding constant to give the label some room to breathe! 
    var padding: CGFloat = 

    //estimate each cell's height
    if let text = array?[indexPath.item].text {
         height = estimateFrameForText(text).height + padding
    }
    return CGSize(width: yourDesiredWidth, height: height)
}