iOS – 在堆栈视图中以编程方式添加垂直线

我正在尝试以编程方式在堆栈视图内的标签之间添加垂直线.

所需的完成将是这样的图像：

我可以添加标签,所有标签都有所需的间距;我可以添加水平线,但我无法弄清楚如何在中间添加这些分隔符垂直线.

我想这样做：

let stackView = UIStackView(arrangedSubviews: [label1,verticalLine,label2,label3])

任何提示？

谢谢

解决方法

您不能在两个地方使用相同的视图,因此您需要创建两个单独的垂直线视图.您需要像这样配置每个垂直线视图：

>设置背景颜色.
>将宽度限制为1(因此您得到一条线,而不是一个矩形).
>限制其高度(因此它不会被拉伸到堆栈视图的整个高度).

因此,一次一个地添加标签到堆栈视图,并在将每个标签添加到堆栈视图之前执行类似的操作：

if stackView.arrangedSubviews.count > 0 {
    let separator = UIView()
    separator.widthAnchor.constraint(equalToConstant: 1).isActive = true
    separator.backgroundColor = .black
    stackView.addArrangedSubview(separator)
    separator.heightAnchor.constraint(equalTo: stackView.heightAnchor,multiplier: 0.6).isActive = true
}

请注意,您不希望垂直线与标签的宽度相同,因此您不能将堆栈视图的分布属性设置为fillEqually.相反,如果您希望所有标签具有相等的宽度,则必须自己在标签之间创建宽度约束.例如,在添加每个新标签后,执行以下操作：

if let firstLabel = stackView.arrangedSubviews.first as? UILabel {
    label.widthAnchor.constraint(equalTo: firstLabel.widthAnchor).isActive = true
}

结果：

完整的游乐场代码(由Federico Zanetello更新为Swift 4.1)：

import UIKit
import PlaygroundSupport

extension UIFont {
  var withSmallCaps: UIFont {
    let feature: [UIFontDescriptor.FeatureKey: Any] = [
      UIFontDescriptor.FeatureKey.featureIdentifier: kLowerCaseType,UIFontDescriptor.FeatureKey.typeIdentifier: kLowerCaseSmallCapsSelector]
    let attributes: [UIFontDescriptor.AttributeName: Any] = [UIFontDescriptor.AttributeName.featureSettings: [feature]]
    let descriptor = self.fontDescriptor.addingAttributes(attributes)
    return UIFont(descriptor: descriptor,size: pointSize)
  }
}

let rootView = UIView(frame: CGRect(x: 0,y: 0,width: 320,height: 44))
rootView.backgroundColor = .white
PlaygroundPage.current.liveView = rootView

let stackView = UIStackView()
stackView.axis = .horizontal
stackView.alignment = .center
stackView.frame = rootView.bounds
rootView.addSubview(stackView)

typealias Item = (name: String,value: Int)
let items: [Item] = [
  Item(name: "posts",value: 135),Item(name: "followers",value: 6347),Item(name: "following",value: 328),]

let valueStyle: [NSAttributedStringKey: Any] = [NSAttributedStringKey.font: UIFont.boldSystemFont(ofSize: 12).withSmallCaps]
let nameStyle: [NSAttributedStringKey: Any] = [NSAttributedStringKey.font: UIFont.systemFont(ofSize: 12).withSmallCaps,NSAttributedStringKey.foregroundColor: UIColor.darkGray]
let valueFormatter = NumberFormatter()
valueFormatter.numberStyle = .decimal

for item in items {
  if stackView.arrangedSubviews.count > 0 {
    let separator = UIView()
    separator.widthAnchor.constraint(equalToConstant: 1).isActive = true
    separator.backgroundColor = .black
    stackView.addArrangedSubview(separator)
    separator.heightAnchor.constraint(equalTo: stackView.heightAnchor,multiplier: 0.4).isActive = true
  }

  let richText = NSMutableAttributedString()
  let valueString = valueFormatter.string(for: item.value)!
  richText.append(NSAttributedString(string: valueString,attributes: valueStyle))
  richText.append(NSAttributedString(string: "\n" + item.name,attributes: nameStyle))
  let label = UILabel()
  label.attributedText = richText
  label.textAlignment = .center
  label.numberOfLines = 0
  stackView.addArrangedSubview(label)

  if let firstLabel = stackView.arrangedSubviews.first as? UILabel {
    label.widthAnchor.constraint(equalTo: firstLabel.widthAnchor).isActive = true
  }
}

UIGraphicsBeginImageContextWithOptions(rootView.bounds.size,true,1)
rootView.drawHierarchy(in: rootView.bounds,afterScreenUpdates: true)
let image = UIGraphicsGetimageFromCurrentimageContext()!
UIGraphicsEndImageContext()
let png = UIImagePNGRepresentation(image)!
let path = NstemporaryDirectory() + "/image.png"
Swift.print(path)
try! png.write(to: URL(fileURLWithPath: path))