Question

我发现了一个很好的教程，解释了一个很好的但是如何使用PureLayout来做一些很酷且简单的布局。我在使标签与视图右侧对齐时遇到了一些麻烦我试图将其放入其中

我把它放在班级的顶端

var cardView: UIView!
var clipView: UIView!
var scrollView: UIScrollView!

...

然后我在viewDidLoad()

中有这个

var openNowLabelView: UIView!
var openNowLabel: UILabel!

cardView = UIView(frame: CGRect.zero)
cardView.layer.shadowColor = UIColor.black.cgColor
cardView.layer.shadowOffset = CGSize(width: 0, height: 12)
cardView.layer.shadowOpacity = 0.33
cardView.layer.shadowRadius = 8
cardView.layer.shadowPath = UIBezierPath(roundedRect: cardView.bounds, cornerRadius: 12).cgPath

self.addSubview(cardView)

clipView = UIView(frame: CGRect.zero)
clipView.backgroundColor = UIColor(red: 42/255, green: 46/255, blue: 61/255, alpha: 1)
clipView.layer.cornerRadius = 12.0
clipView.clipsToBounds = true

cardView.addSubview(clipView)

scrollView = UIScrollView(frame: CGRect.zero)

clipView.addSubview(scrollView)

...

openNowLabelView = UIView(frame: CGRect.zero)
openNowLabel = UILabel(frame: CGRect.zero)
openNowLabel.textColor = UIColor(red: 1, green: 1, blue: 1, alpha: 0.5)
openNowLabel.font = UIFont(name: "Gibson-Regular", size: 18)
openNowLabel.text = "Open Now"
openNowLabelView.layer.borderWidth = 1
openNowLabelView.layer.borderColor = UIColor.red.cgColor
openNowLabel.textAlignment = .right

openNowLabelView.addSubview(openNowLabel)
scrollView.addSubview(openNowLabelView)

我有一个override func updateConstraints()函数

if(shouldSetupConstraints) {
  cardView.autoPinEdge(toSuperviewEdge: .bottom, withInset: edgesInset)
  cardView.autoPinEdge(toSuperviewEdge: .left, withInset: edgesInset)
  cardView.autoPinEdge(toSuperviewEdge: .right, withInset: edgesInset)
  cardView.autoSetDimension(.height, toSize: UIScreen.main.bounds.height - 32)

  clipView.autoPinEdge(.top, to: .top, of: cardView)
  clipView.autoPinEdge(.left, to: .left, of: cardView)
  clipView.autoPinEdge(.right, to: .right, of: cardView)
  clipView.autoPinEdge(.bottom, to: .bottom, of: cardView)

  scrollView.autoPinEdge(.top, to: .top, of: clipView, withOffset: 161)
  scrollView.autoPinEdge(.bottom, to: .bottom, of: clipView)
  scrollView.autoPinEdge(.left, to: .left, of: clipView)
  scrollView.autoPinEdge(.right, to: .right, of: clipView)

  ...

  openNowLabel.sizeToFit()
  openNowLabelView.autoSetDimension(.height, toSize: openNowLabel.bounds.height)
  openNowLabelView.autoSetDimension(.width, toSize: openNowLabel.bounds.width)
  openNowLabelView.autoPinEdge(.right, to: .right, of: scrollView, withOffset: edgesInset)
  openNowLabelView.autoPinEdge(.top, to: .top, of: placeDistanceLabelView)
  shouldSetupConstraints = false
}
super.updateConstraints()

这是我看起来像这样的结果......

我不明白为什么会发生这种情况

更新

我已经清理了一些视图和标签，试图让它更清晰，我能够解决我遇到的问题，我需要在视图中嵌入标签以制作PureLayout图书馆的工作，希望这可以更好地说明我的代码对我在屏幕上看到的内容的描述

// setup views and labels
...
var scrollView: UIScrollView = {
    let view = UIScrollView.newAutoLayout()
    view?.translatesAutoresizingMaskIntoConstraints = false
    return view!
}()
...
var placeTitleLabel: UILabel = {
    let label = UILabel.newAutoLayout()
    label?.numberOfLines = 1
    label?.lineBreakMode = .byClipping
    label?.textColor = .white
    label?.font = UIFont(name: "Gibson-Semibold", size: 25)
    return label!
}()
var placeDistanceLabel: UILabel = {
    let label = UILabel.newAutoLayout()
    label?.numberOfLines = 1
    label?.lineBreakMode = .byClipping
    label?.textColor = UIColor(red: 1, green: 1, blue: 1, alpha: 0.5)
    label?.font = UIFont(name: "Gibson-Regular", size: 18)
    return label!
}()
var placeNumReviewsLabel: UILabel = {
    let label = UILabel.newAutoLayout()
    label?.numberOfLines = 1
    label?.lineBreakMode = .byClipping
    label?.textColor = UIColor(red: 1, green: 1, blue: 1, alpha: 0.5)
    label?.font = UIFont(name: "Gibson-Regular", size: 12)
    return label!
}()
var openNowLabel: UILabel = {
    let label = UILabel.newAutoLayout()
    label?.numberOfLines = 1
    label?.lineBreakMode = .byClipping
    label?.textColor = UIColor(red: 1, green: 1, blue: 1, alpha: 0.5)
    label?.font = UIFont(name: "Gibson-Regular", size: 18)
    label?.text = "Open Now"
    label?.textAlignment = .right
    return label!
}()

// constraints
placeTitleLabel.setContentCompressionResistancePriority(UILayoutPriority.required, for: .vertical)
placeTitleLabel.autoPinEdge(.top, to: .top, of: scrollView, withOffset: edgesInset)
placeTitleLabel.autoPinEdge(.left, to: .left, of: scrollView, withOffset: edgesInset)

placeDistanceLabel.setContentCompressionResistancePriority(UILayoutPriority.required, for: .vertical)
placeDistanceLabel.autoPinEdge(.left, to: .left, of: scrollView, withOffset: edgesInset)
placeDistanceLabel.autoPinEdge(.top, to: .bottom, of: placeTitleLabel, withOffset: edgesInset / 2)

placeNumReviewsLabel.setContentCompressionResistancePriority(UILayoutPriority.required, for: .vertical)
placeNumReviewsLabel.autoPinEdge(.left, to: .right, of: ratingView, withOffset: edgesInset)
placeNumReviewsLabel.autoPinEdge(.top, to: .top, of: ratingView, withOffset: -2)

openNowLabel.setContentCompressionResistancePriority(UILayoutPriority.required, for: .vertical)
openNowLabel.autoPinEdge(.trailing, to: .trailing, of: scrollView, withOffset: edgesInset)
openNowLabel.autoPinEdge(.top, to: .top, of: placeDistanceLabel)

据我在检查员中可以看出，当我突出显示scrollView标签嵌入其中时，我的容器的宽度就在那里，标签本身似乎有宽度等等，我我只是不确定为什么我不能对齐右边缘，左边缘没有问题。

当我检查模拟器时，我在openNowLabel旁边看到了这个图标，但我不确定它的含义或我如何获取有关它的信息，这是否与我的问题有关？

这是我上传的回购链接的链接，其中包含了运行所需的所有窗格，如果原始上下文有助于理解我看到的内容

https://github.com/Jordan4jc/place-app-test

Answer 1

在您分享的代码示例中，您似乎已将openNowLabel添加为openNowLabelView的子视图，但您从未设置其约束。

如果我正确理解您要实现的目标，则需要将openNowLabel的边缘固定在其超级视图上（在openNowLabelView的情况下）。

<强>更新

根据您共享的项目，看起来您的滚动视图及其子视图未获得所有必需的约束，因此系统知道如何计算内容大小。看一下Apple的这篇文章（Technical Note TN2154）：

使用约束在滚动视图中布置子视图确保约束绑定到滚动视图的所有四个边缘不要依赖滚动视图来获取它们的大小。

尝试添加这些约束，看看你是否得到了你想要的布局：

openNowLabel.autoPinEdge(.left, to: .right, of: placeDistanceLabel, withOffset: edgesInset)
ratingView.autoPinEdge(.bottom, to: .bottom, of: scrollView, withOffset: edgesInset)

注意：如果您只添加第一个约束，则您的布局看起来会相同，但滚动视图的布局会模糊不清，因为它无法计算内容大小的高度。

无法使用PureLayout

1 个答案: