-systemLayoutSizeFittingSize: returning incorrect height for tableHeaderView under iOS 8

Question

There are numerous threads about correctly sizing a tableHeaderView with auto-layout (one such thread) but they tend to pre-date iOS 8.

I have a situation with numerous

Answer 1

The proper solution for this problem in Swift 3 is using this class instead of standard UILabel:

class UILabelPreferedWidth : UILabel {
    override var bounds: CGRect {
        didSet {
            if (bounds.size.width != oldValue.size.width) {
                self.setNeedsUpdateConstraints()
            }
        }
    }

    override func updateConstraints() {
        if(preferredMaxLayoutWidth != bounds.size.width) {
            preferredMaxLayoutWidth = bounds.size.width
        }
        super.updateConstraints()
    }
}

Also make sure that you didn't disable those two on your Cell class:

translatesAutoresizingMaskIntoConstraints = false
contentView.translatesAutoresizingMaskIntoConstraints = false