我有tableView,并在其上面有一个imageView。使用此指南https://github.com/abhimuralidharan/StretchableTableViewHeader-Swift制作可伸缩的标题现在我必须在我的图像上添加标签。当tableView滚动时,此标签应更改大小/字体。
我在另一个类中创建了我的imageView:
class LotteryHeaderView: UIImageView {
let ticketsCountLabel: UILabel = {
let label = UILabel()
label.textColor = .white
label.translatesAutoresizingMaskIntoConstraints = false
label.font = UIFont.boldSystemFont(ofSize: 100)
return label
}()
let infoLabel: UILabel = {
let label = UILabel()
label.textColor = .white
label.textAlignment = .center
label.translatesAutoresizingMaskIntoConstraints = false
label.font = UIFont.systemFont(ofSize: 13, weight: .medium)
label.numberOfLines = 2
label.text = Localizable.all_user_tickets_count()
return label
}()
override init(frame: CGRect) {
super.init(frame: frame)
self.addSubViews([ticketsCountLabel, infoLabel])
ticketsCountLabel.centerX(to: self.centerXAnchor)
.centerY(to: self.centerYAnchor)
infoLabel.top(to: ticketsCountLabel.bottomAnchor, constant: 7)
.width(constant: 184)
.centerX(to: self.centerXAnchor)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
在我的控制器中初始化它:
let imageView = LotteryHeaderView(frame: CGRect(x: 0, y: 0, width: Constants.Size.screenWidth, height: 300))
在viewDidLoad中设置:
imageView.frame = CGRect(x: 0, y: 0, width: Constants.Size.screenWidth, height: 300)
imageView.image = R.image.santa_fe()
imageView.contentMode = .scaleAspectFill
imageView.clipsToBounds = true
view.addSubview(imageView)
这里func在每次滚动tableview时被调用,并且它适用于我的图像(它可折叠和可伸缩):
func scrollImageInHeader(scrollView: UIScrollView) {
let y = 300 - (scrollView.contentOffset.y + 300)
let height = min(max(y, 60), 450)
imageView.frame = CGRect(x: 0, y: 0, width: Constants.Size.screenWidth, height: height)
}
尝试在this StackOverFlowAnswer下添加scrollImageInHeader()代码,但它没有帮助
let offset = scrollView.contentOffset.y
let scale = min(max(1.0 - offset / 200.0, 0.0), 1.0)
imageView.ticketsCountLabel.transform = CGAffineTransform(scaleX: scale, y: scale)
请,任何帮助将不胜感激。
UIScrollView是父UITableViewController。您可以使用带有UIScrollViewDelegate的UIScrollView来设置标签字体大小和scrollOffset:CGFloat关注.y
extension ViewController: UIScrollViewDelegate{
func scrollViewDidScroll(_ scrollView: UIScrollView) {
var scrollOffset : CGFloat = scrollView.contentOffset.y
// process with scrollOffset
}
}
其实我发现了自己的错误。来自Here的代码帮助了。 Class LotteryHeaderView我改为UIView并添加了一个UIImageView。