Joey Joey - 5 months ago 22
Swift Question

How to implement UIVibrancyEffect for table view header?

I would like my table view section headers text to be rendered in the vibrant style, where the underlying UI shines through the text. I have tried the following, but nothing appears for the header as if I returned

nil
.

override func tableView(tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
//Add vibrancy text effect
let blurEffect = UIBlurEffect(style: .Light)
let vibrancyEffect = UIVibrancyEffect(forBlurEffect: blurEffect)
let vibrancyEffectView = UIVisualEffectView(effect: vibrancyEffect)

//Label for vibrant text
let vibrantLabel = UILabel()
vibrantLabel.text = "testing"
vibrantLabel.font = UIFont.systemFontOfSize(11.0)
vibrantLabel.textColor = UIColor(white: 0.64, alpha: 1)
vibrancyEffectView.contentView.addSubview(vibrantLabel)

return vibrancyEffectView
}

Answer

Solved it. The only problems with my code provided in the question are: I had to set the frames for the view and label (duh), and I needed to specify the blur effect style to be .Dark not .Light to ensure the text was light colored not dark. For anyone who has the same question, here's the code. You'll want to tweak the position/size/etc of the text I'm sure. Note that I already had applied a blur effect for the table view's background.

//Create vibrancy text effect
let blurEffect = UIBlurEffect(style: .dark)
let vibrancyEffect = UIVibrancyEffect(blurEffect: blurEffect)
let vibrancyEffectView = UIVisualEffectView(effect: vibrancyEffect)
vibrancyEffectView.frame = CGRect(x: 0, y: 0, width: tableView.bounds.size.width, height: 40)
vibrancyEffectView.autoresizingMask = .flexibleWidth

//Create header label
let vibrantLabel = UILabel()
vibrantLabel.frame = vibrancyEffectView.frame
vibrantLabel.autoresizingMask = .flexibleWidth
vibrantLabel.text = "testing"
vibrantLabel.font = UIFont.systemFont(ofSize: 16)
vibrantLabel.textColor = UIColor(white: 0.64, alpha: 1)

vibrancyEffectView.contentView.addSubview(vibrantLabel)
return vibrancyEffectView

image of the final effect