How to change a UICollectionViewListCell’s separator inset
This article covers beta technology and it's up to date for Xcode 12 beta 1
In WWDC2020's session Lists in UICollectionView a slide is shown where a UICollectionViewListCell's separator inset is updated by assigning a new leading anchor to separatorLayoutGuide.leadingAnchor.
Unfortunately, this doesn't work in when you try to do it.
To set the separator inset for a UICollectionViewListCell you can update the leading anchor constraint by overriding updateConstraints in a UICollectionViewListCell subclass. Setting the anchor in init will cause the system to override your custom anchor leaving you with the default inset.
override func updateConstraints() {
super.updateConstraints()
separatorLayoutGuide.leadingAnchor.constraint(equalTo: someOtherView.leadingAnchor, constant: 10).isActive = true
}You can set the leadingAnchor constraint just like you would set any other constraint. In fact, you can even set the separator's trailingAnchor using the same method I just showed if you want to offset the seperator from the trailing edge of your content view.
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