背景透明的颜色

Question

我想在我的幻灯片菜单中制作透明色，如youtube，任何想法？ 请帮助！

Answer 1

您可以使用 iOS 8 默认UIVisualEffect和UIVisualEffectView轻松添加模糊效果。确保它仅适用于iOS 8以上。

UIVisualEffect *blurV = [UIBlurEffect effectWithStyle:UIBlurEffectStyleDark];
UIVisualEffectView *visualV = [[UIVisualEffectView alloc] initWithEffect:blurV];

visualV.frame = yourImageView.bounds;
[yourImageView addSubview:visualEffectView];

您可以添加三种默认效果之一

typedef NS_ENUM(NSInteger, UIBlurEffectStyle) {
UIBlurEffectStyleExtraLight,
UIBlurEffectStyleLight,
UIBlurEffectStyleDark
} NS_ENUM_AVAILABLE_IOS(8_0);

对于Swift

var visualV = UIVisualEffectView(effect: UIBlurEffect(style: .Dark)) as UIVisualEffectView
visualV.frame = yourImageView.bounds
yourImageView.addSubview(visualV)

Answer 2

试试这个：

override func tableView(tableView: UITableView?, cellForRowAtIndexPath indexPath: NSIndexPath?) -> UITableViewCell?
{
    println("The indexPath code is \(indexPath!.row)")

    let cell = tableView!.dequeueReusableCellWithIdentifier("FlowerTableViewCell", forIndexPath: indexPath) as FlowerTableViewCell

    let flower = flowers[indexPath!.row] as Flower

    let backgroundImageView = UIImageView(image: UIImage(named: flower.backgroundImage))

    cell.backgroundView = backgroundImageView

    var visualEffectView = UIVisualEffectView(effect: UIBlurEffect(style: .Light)) as UIVisualEffectView

    visualEffectView.frame = CGRectMake(0, 0, cell.bounds.width, cell.bounds.height)
    backgroundImageView.addSubview(visualEffectView)

    cell.textLabel.text = flower.name
    cell.textLabel.textColor = UIColor.whiteColor()
    cell.textLabel.backgroundColor = UIColor.clearColor()

    return cell
}

希望这会对你有所帮助。你也可以看看这篇博客文章： http://blog.bubbly.net/2013/09/11/slick-tricks-for-ios-blur-effect/