UIImageView with Aspect Fill inside custom UITableViewCell using AutoLayout

13,199

I cobbled together a solution based on two previous answers:

I wanted to keep the AspectRatio of the image regardless of its Height while fixing up the Width according to that of the UIImageView, the container of the image.

The solution comprises of :

  1. Adding a new AspectRatio constraint

    let image = UIImage(ContentFromFile: "path/to/image")
    let aspect = image.size.width / image.size.height
    
    aspectConstraint = NSLayoutConstraint(item: cardMedia, attribute:  NSLayoutAttribute.Width, relatedBy: NSLayoutRelation.Equal, toItem: cardMedia, attribute: NSLayoutAttribute.Height, multiplier: aspect, constant: 0.0)
    

    when adding this constraint, xCode will complain about the new "redundant" constraint and attempt to break it, rendering it useless, yet displaying the image exactly like I want. This leads me to the second solution

    1. Lowering the priority of the new constrain to '999' seems to stop xcode from breaking it, and it stopped showing warning message about the new constraint

      aspectConstraint?.priority = 999

Not sure why xCode automatically adds UIView-Encapsulated-Layout-Height and UIView-Encapsulated-Layout-Height at build/run time; however, I learned how to respect that and live with it :)

Just leaving the solution here for anyone to check. This is working on iOS 8. I tried with iOS7 but it doesn't work the same as you need to implement tableView:heightForRowAtIndexPath calculating the height of the cell based on all the items contained within it and disable setting up:

tableView.rowHeight = UITableViewAutomaticDimension
tableView.estimatedRowHeight = 44.0
Share:
13,199

Related videos on Youtube

Mickey Mouse
Author by

Mickey Mouse

Rats-bred mouse

Updated on September 15, 2022

Comments

  • Mickey Mouse
    Mickey Mouse about 1 year

    I've been struggling with fitting an UIImageView which shows images of variable widths and heights with Aspect Fill. The cell height is not adapting to the new height of the UIImageView and persist it's height.

    The hierarchy of the views is this

    • UITableViewCell
      • UITableViewCell.ContentView
        • UIImageView

    I tried these scenarios in XCode Auto Layout :

    • set the UIImageView => Height to remove at build time
    • set the Intrinsic Value of the UIImageView to placeholder
    • set the Intrinsic Value for each of the UIImageView, ContentView and UITableViewCell to placeholder

    With any of these combinations I get this view:

    http://i.stack.imgur.com/Cw7hS.png

    The blue lines represent the cell borders (boundaries) and the green ones represent the UIImageView border (boundaries). There are four cells in this example, the 1st and the 3rd ones have no images and the 2nd and the 4th ones have the same image (overflowing over the ones which have none).

  • Mickey Mouse
    Mickey Mouse over 8 years
    I think what you are trying to say is how to fit the UIImage within the UIImageView, right? The issue I have is really not with the UIImageView but really with the encompassing cell. I only have a portrait mode for iPhone and the width is always fixed. So the height of the cell is what remains fixed despite the changed height of the UIImageView when I fit the image in it. Not sure if we are on the same page here.
  • Jonny Vu
    Jonny Vu about 8 years
    It is no need to do this. Too complicated. Just use [imageView setClipsToBounds: YES]. Refer to: stackoverflow.com/questions/14609132/…
  • Mickey Mouse
    Mickey Mouse about 8 years
    I don't think you got the question. The question was about letting the UITableViewCell height adapts to the height of the image within it, which is different than fitting the image inside the UIView and clipping its boundaries.
  • KChen
    KChen over 7 years
    To be simple, just add a constraint of the height of the image (which is easy to be done in storyboard) and calculate it when setting image. The priority also should be 999.