UIView backgroundColor disappears when UITableViewCell is selected

Question

I have a simple tableViewCell build in interface builder. It contains a UIView which contains an image. Now, when I select the cell, the default blue selection background is

Answer 1

Summary

This solution let's you lock some of a cell's background colors, while the remainder are controlled by system behaviour.

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Based on mientus' answer, I have created a solution which allows you to specify which views should keep their background color.

This still allows other cell subviews to have their background removed on highlighting/selection, and is the only solution which works in our case (two views needing a permanent background).

I used a protocol-oriented approach, with a BackgroundLockable protocol containing the list of views to lock, and running a closure while keeping the colors:

protocol BackgroundLockable {
    var lockedBackgroundViews: [UIView] { get }
    func performActionWithLockedViews(_ action: @escaping () -> Void)
}

extension BackgroundLockable {
    func performActionWithLockedViews(_ action: @escaping () -> Void) {
        let lockedViewToColorMap = lockedBackgroundViews.reduce([:]) { (partialResult, view) -> [UIView: UIColor?] in
            var mutableResult = partialResult
            mutableResult[view] = view.backgroundColor
            return mutableResult
        }

        action()

        lockedViewToColorMap.forEach { (view: UIView, color: UIColor?) in
            view.backgroundColor = color
        }
    }
}

Then I have a subclass of UITableViewCell, which overrides highlighting and selection to run the protocol's closure around calling the default (super) behaviour:

class LockableBackgroundTableViewCell: UITableViewCell, BackgroundLockable {

    var lockedBackgroundViews: [UIView] {
        return []
    }

    override func setHighlighted(_ highlighted: Bool, animated: Bool) {
        performActionWithLockedViews {
            super.setHighlighted(highlighted, animated: animated)
        }
    }

    override func setSelected(_ selected: Bool, animated: Bool) {
        performActionWithLockedViews {
            super.setSelected(selected, animated: animated)
       }
    }
}

Now I just have to subclass LockableBackgroundTableViewCell or use the BackgroundLockable protocol in a cell class to easily add locking behaviour to some cells!

class SomeCell: LockableBackgroundTableViewCell {

    @IBOutlet weak var label: UILabel!
    @IBOutlet weak var icon: UIImageView!
    @IBOutlet weak var button: UIButton!

    override var lockedBackgroundViews: [UIView] {
        return [label, icon]
    }
}