如何为表视图头实现UIVibrancyEffect？

Question

我希望我的表格视图部分标题文本以鲜明的风格呈现，底层的UI在文本中闪耀。我尝试过以下操作，但标题没有显示，就像我返回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 1

解决了它。我在问题中提供的代码的唯一问题是：我必须为视图和标签（duh）设置框架，我需要将模糊效果样式指定为.Dark而不是.Light确保文字浅色而不是黑暗。对于有相同问题的人，这是代码。您需要调整我确定的文本的位置/大小/等。请注意，我已经为表格视图的背景应用了模糊效果。

//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