Swift iOS - setContentHuggingPriority优先处理错误的标签
Swift iOS - setContentHuggingPriority优先处理错误的标签
提问于 2019-06-06 07:58:07
我有一个有4个标签的单元格：
2个单独的静态标签和2个单独的动态标签。两个静态标签中的文本始终显示Receipt #，另一个显示Receipt Date。
我设置它的方法是静态标签都将前导锚点固定在单元格的contentView的leadingAnchor上。它们都将setContentHuggingPriority设置为High，并将setContentCompressionResistancePriority设置为Low。它们的bottomAnchors被附加到每个匹配的动态标签的lastBaseLineAnchor上
动态标签的尾部锚点都固定在contentView的trailingAnchor上。
receiptNumberLabel的leadingAnchor被固定到receiptDateLabel的leadingAnchor。
receiptDateLabel的leadingAnchor被固定在离staticReceiptDateLabel 10点的地方。这个标签应该是灵活的，但事实并非如此。由于receiptNumberLabels的leadingAnchor遵循这一点，所以它也是未对齐的。
如您所见，staticReceiptDateLabel更长，但它应该更短，receiptDateLabel应该更长。我已经尝试了setContentHuggingPriority和setContentCompressionResistancePriority的值的不同组合，但无论我得到什么结果，我如何解决这个问题？
contentView.addSubview(receiptNumberLabel) // dynamic
contentView.addSubview(staticReceiptNumberLabel)
contentView.addSubview(receiptDateLabel) // dynamic
contentView.addSubview(staticReceiptDateLabel)
receiptNumberLabel.topAnchor.constraint(equalTo: contentView.topAnchor, constant: 10).isActive = true
receiptNumberLabel.leadingAnchor.constraint(equalTo: receiptDateLabel.leadingAnchor, constant: 0).isActive = true
receiptNumberLabel.trailingAnchor.constraint(equalTo: contentView.trailingAnchor, constant: -10).isActive = true
receiptNumberLabel.setContentHuggingPriority(.defaultLow, for: .horizontal)
receiptNumberLabel.setContentCompressionResistancePriority(.defaultHigh, for: .horizontal)
staticReceiptNumberLabel.leadingAnchor.constraint(equalTo: contentView.leadingAnchor, constant: 10).isActive = true
staticReceiptNumberLabel.lastBaselineAnchor.constraint(equalTo: receiptNumberLabel.lastBaselineAnchor).isActive = true
staticReceiptNumberLabel.setContentHuggingPriority(.defaultHigh, for: .horizontal)
staticReceiptNumberLabel.setContentCompressionResistancePriority(.defaultLow, for: .horizontal)
receiptDateLabel.topAnchor.constraint(equalTo: receiptNumberLabel.bottomAnchor, constant: 10).isActive = true
receiptDateLabel.leadingAnchor.constraint(equalTo: staticReceiptDateLabel.trailingAnchor, constant: 10).isActive = true
receiptDateLabel.trailingAnchor.constraint(equalTo: contentView.trailingAnchor, constant: -10).isActive = true
receiptDateLabel.setContentHuggingPriority(UILayoutPriority.defaultLow, for: .horizontal)
receiptDateLabel.setContentCompressionResistancePriority(.defaultHigh, for: .horizontal)
staticReceiptDateLabel.leadingAnchor.constraint(equalTo: contentView.leadingAnchor, constant: 10).isActive = true
staticReceiptDateLabel.lastBaselineAnchor.constraint(equalTo: receiptDateLabel.lastBaselineAnchor).isActive = true
staticReceiptDateLabel.setContentHuggingPriority(UILayoutPriority.defaultHigh, for: .horizontal)
staticReceiptDateLabel.setContentCompressionResistancePriority(.defaultLow, for: .horizontal)更新
在评论中@bsod建议根本不要使用拥抱/压缩。我最初没有使用它们，同样的问题也发生了，我在万不得已的情况下转而使用它们。这是没有拥抱/压缩的代码。
receiptNumberLabel.topAnchor.constraint(equalTo: contentView.topAnchor, constant: 10).isActive = true
receiptNumberLabel.leadingAnchor.constraint(equalTo: receiptDateLabel.leadingAnchor, constant: 0).isActive = true
receiptNumberLabel.trailingAnchor.constraint(equalTo: contentView.trailingAnchor, constant: -10).isActive = true
staticReceiptNumberLabel.leadingAnchor.constraint(equalTo: contentView.leadingAnchor, constant: 10).isActive = true
staticReceiptNumberLabel.lastBaselineAnchor.constraint(equalTo: receiptNumberLabel.lastBaselineAnchor).isActive = true
receiptDateLabel.topAnchor.constraint(equalTo: receiptNumberLabel.bottomAnchor, constant: 10).isActive = true
receiptDateLabel.leadingAnchor.constraint(equalTo: staticReceiptDateLabel.trailingAnchor, constant: 10).isActive = true
receiptDateLabel.trailingAnchor.constraint(equalTo: contentView.trailingAnchor, constant: -10).isActive = true
staticReceiptDateLabel.leadingAnchor.constraint(equalTo: contentView.leadingAnchor, constant: 10).isActive = true
staticReceiptDateLabel.lastBaselineAnchor.constraint(equalTo: receiptDateLabel.lastBaselineAnchor).isActive = true回答 1
Stack Overflow用户
回答已采纳
发布于 2019-06-06 09:36:05
忘记拥抱/压缩API，并将其作为起点。从左上角的标签开始，从左到右，从上到下。请注意，静态日期标签的顶部锚点固定在收据编号的值标签的底部，以防它包含多行。
staticReceiptNumberLabel.leadingAnchor.constraint(equalTo: contentView.leadingAnchor, constant: 10).isActive = true
staticReceiptNumberLabel.topAnchor.constraint(equalTo: contentView.topAnchor, constant: 10).isActive = true
receiptNumberLabel.topAnchor.constraint(equalTo: staticReceiptNumberLabel.topAnchor).isActive = true
receiptNumberLabel.leadingAnchor.constraint(equalTo: staticReceiptNumberLabel.trailing, constant: 10).isActive = true
receiptNumberLabel.trailingAnchor.constraint(equalTo: contentView.trailingAnchor, constant: -10).isActive = true
staticReceiptDateLabel.leadingAnchor.constraint(equalTo: staticReceiptNumberLabel.leadingAnchor).isActive = true
staticReceiptDateLabel.topAnchor.constraint(equalTo: receiptNumberLabel.bottomAnchor).isActive = true
receiptDateLabel.topAnchor.constraint(equalTo: staticReceiptDateLabel.topAnchor).isActive = true
receiptDateLabel.leadingAnchor.constraint(equalTo: staticReceiptDateLabel.trailingAnchor, constant: 10).isActive = true
receiptDateLabel.trailingAnchor.constraint(equalTo: contentView.trailingAnchor, constant: -10).isActive = true
receiptDateLabel.bottomAnchor.constraint(equalTo: contentView.bottomAnchor, constant: -10).isActive = true您可能还需要显式地将标题标签的numberOfLines设置为1，否则即使值标签的numberOfLines为0，UIKit也可能会截断它。
如果，无论出于什么原因，您甚至不希望静态标签的大小扩大，可能是因为您为它们提供了背景色，那么您可以引入hugging/压缩API。如果是这样，静态标签将是：
theStaticLabel.setContentCompressionResistancePriority(.defaultHigh, for: .horizontal)
theStaticLabel.setContentHuggingPriority(.defaultHigh, for: .horizontal)而动态标签将是：
theDynamicLabel.setContentCompressionResistancePriority(.defaultLow, for: .horizontal)
theDynamicLabel.setContentHuggingPriority(.defaultLow, for: .horizontal)页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/56469441
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