在tableviewcell中隐藏UIStackview的 subview 时，有时会发生autolayout冲突。
我还尝试了 addArrangedSubview 和 removeArrangedSubview 而不是隐藏和取消隐藏。但结果是一样的。
uistackview 有四个 subview 。 我打印了每个 subview 的隐藏状态。 正如您在下面看到的，第一、第二、第三 View 已经取消隐藏。但是自动布局无法获得该状态。 CellHeight 按预期设置，313(基本单元格高度为 157，每个 subview 的高度为 52。因此为 313)。我知道发生冲突的原因是单元格高度已设置为 313，但 subview 的高度不是 313。因为第二个和第三个 View 尚未被识别。
有趣的是 UI 完美运行。只是冲突警告。并且冲突并非每次都发生。有时当我取消隐藏第二个 View 时，它发生了，有时添加第二个 View 是好的，但不是第三个 View 。
我真的很想知道确切的原因并消除警告。
感谢您的帮助。
firstChildAgeView.isHidden : NO
secondChildAgeView.isHidden : NO
thirdChildAgeView.isHidden : NO
forthChildAgeView.isHidden : YES
cellHeight : 313.0
2019-06-04 23:07:38.076484+0900 allstay[80237:18107365] [LayoutConstraints] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want.
Try this:
(1) look at each constraint and try to figure out which you don't expect;
(2) find the code that added the unwanted constraint or constraints and fix it.
(
"<NSLayoutConstraint:0x6000011c9a40 firstChildAgeView.height == 52 (active, names: firstChildAgeView:0x7fb68e0423c0 )>",
"<NSLayoutConstraint:0x6000011c0aa0 V:|-(0)-[containerStackView] (active, names: containerStackView:0x7fb68e03c6a0, '|':allstay.RoomCountViewCell:0x7fb68f898800'RoomCountViewCell' )>",
"<NSLayoutConstraint:0x6000011c0b40 V:[containerStackView]-(10)-[UIView:0x7fb68e03c150] (active, names: containerStackView:0x7fb68e03c6a0 )>",
"<NSLayoutConstraint:0x6000011c0b90 UIView:0x7fb68e03c150.height == 1 (active)>",
"<NSLayoutConstraint:0x6000011c0be0 V:[UIView:0x7fb68e03c150]-(0)-| (active, names: '|':allstay.RoomCountViewCell:0x7fb68f898800'RoomCountViewCell' )>",
"<NSLayoutConstraint:0x6000011c0e10 roomTitleContainerView.height == 32 (active, names: roomTitleContainerView:0x7fb68e03bbf0 )>",
"<NSLayoutConstraint:0x6000011c0e60 roomAdultContainerView.height == 52 (active, names: roomAdultContainerView:0x7fb68e03b210 )>",
"<NSLayoutConstraint:0x6000011c0eb0 roomChildrenContainerView.height == 52 (active, names: roomChildrenContainerView:0x7fb68e03bf70 )>",
"<NSLayoutConstraint:0x6000011c28a0 'UISV-canvas-connection' containerStackView.top == roomTitleContainerView.top (active, names: containerStackView:0x7fb68e03c6a0, roomTitleContainerView:0x7fb68e03bbf0 )>",
"<NSLayoutConstraint:0x6000011c28f0 'UISV-canvas-connection' V:[firstChildAgeView]-(0)-| (active, names: containerStackView:0x7fb68e03c6a0, firstChildAgeView:0x7fb68e0423c0, '|':containerStackView:0x7fb68e03c6a0 )>",
"<NSLayoutConstraint:0x6000011c2940 'UISV-spacing' V:[roomTitleContainerView]-(10)-[roomAdultContainerView] (active, names: roomAdultContainerView:0x7fb68e03b210, roomTitleContainerView:0x7fb68e03bbf0 )>",
"<NSLayoutConstraint:0x6000011c2990 'UISV-spacing' V:[roomAdultContainerView]-(0)-[roomChildrenContainerView] (active, names: roomChildrenContainerView:0x7fb68e03bf70, roomAdultContainerView:0x7fb68e03b210 )>",
"<NSLayoutConstraint:0x6000011c29e0 'UISV-spacing' V:[roomChildrenContainerView]-(0)-[firstChildAgeView] (active, names: firstChildAgeView:0x7fb68e0423c0, roomChildrenContainerView:0x7fb68e03bf70 )>",
"<NSLayoutConstraint:0x6000011c30c0 'UIView-Encapsulated-Layout-Height' allstay.RoomCountViewCell:0x7fb68f898800'RoomCountViewCell'.height == 313 (active)>"
)
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x6000011c2940 'UISV-spacing' V:[roomTitleContainerView]-(10)-[roomAdultContainerView] (active, names: roomAdultContainerView:0x7fb68e03b210, roomTitleContainerView:0x7fb68e03bbf0 )>
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKitCore/UIView.h> may also be helpful.
编辑:更新代码
这是制作单元格的完整代码。
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "countViewCell", for: indexPath) as! countViewCell
countArray = info.getCount()
cell.setupViews(vc: self, countInfo: countArray[indexPath.item], row:indexPath.item)
if countArray.count == 1 {
cell.removeCellButton.isHidden = true
} else {
cell.removeCellButton.isHidden = false
}
if countArray.count == 4 {
countTableView.tableFooterView?.isHidden = true
} else {
countTableView.tableFooterView?.isHidden = false
}
return cell
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
roomArray = info.getCount()
let childrenCount = countArray[indexPath.item].components(separatedBy: ",").count - 1
return 157 + CGFloat(childrenCount * 52)
}
func changeChildrenCountRow(row:Int) {
let range = Range(NSRange(location: 0, length: 1))
let sectionToReload = IndexSet(integersIn: range!)
countTableView.reloadSections(sectionToReload, with: .fade)
}
cell class ----------------------------------------------------------
func setupViews(vc:countViewController, guestInfo:String, row:Int) {
countViewController = vc
numberLabel.text = "\(row+1)"
let guestArray = guestInfo.components(separatedBy: ",")
childrenCount = guestArray.count - 1
adultCount = Int(guestArray[0])!
adultCountLabel.text = "\(adultCount)"
childrenCountLabel.text = "\(childrenCount)"
setChildrenAgeViews()
addSubview(containerStackView)
addSubview(separatorView)
containerStackView.addArrangedSubview(titleContainerView)
containerStackView.addCustomSpacing(10, after: titleContainerView)
containerStackView.addArrangedSubview(adultContainerView)
containerStackView.addArrangedSubview(childrenContainerView)
titleContainerView.addSubview(numberLabel)
titleContainerView.addSubview(removeButton)
adultContainerView.addSubview(adultLabel)
adultContainerView.addSubview(reduceAdultCountButton)
adultContainerView.addSubview(adultCountLabel)
adultContainerView.addSubview(addAdultCountButton)
childrenContainerView.addSubview(childrenLabel)
childrenContainerView.addSubview(reduceChildrenCountButton)
childrenContainerView.addSubview(childrenCountLabel)
childrenContainerView.addSubview(addChildrenCountButton)
firstChildAgeView.accessibilityIdentifier = "firstChildAgeView"
secondChildAgeView.accessibilityIdentifier = "secondChildAgeView"
thirdChildAgeView.accessibilityIdentifier = "thirdChildAgeView"
forthChildAgeView.accessibilityIdentifier = "forthChildAgeView"
titleContainerView.accessibilityIdentifier = "titleContainerView"
adultContainerView.accessibilityIdentifier = "adultContainerView"
childrenContainerView.accessibilityIdentifier = cChildrenContainerView"
containerStackView.accessibilityIdentifier = "containerStackView"
firstChildAgeView.addSubview(firstChildAgeButton)
firstChildAgeView.addConstraintsWithFormat(format: "H:[v0(80)]-29-|", views: firstChildAgeButton)
firstChildAgeView.addConstraintsWithFormat(format: "V:|[v0]|", views: firstChildAgeButton)
secondChildAgeView.addSubview(secondChildAgeButton)
secondChildAgeView.addConstraintsWithFormat(format: "H:[v0(80)]-29-|", views: secondChildAgeButton)
secondChildAgeView.addConstraintsWithFormat(format: "V:|[v0]|", views: secondChildAgeButton)
thirdChildAgeView.addSubview(thirdChildAgeButton)
thirdChildAgeView.addConstraintsWithFormat(format: "H:[v0(80)]-29-|", views: thirdChildAgeButton)
thirdChildAgeView.addConstraintsWithFormat(format: "V:|[v0]|", views: thirdChildAgeButton)
forthChildAgeView.addSubview(forthChildAgeButton)
forthChildAgeView.addConstraintsWithFormat(format: "H:[v0(80)]-29-|", views: forthChildAgeButton)
forthChildAgeView.addConstraintsWithFormat(format: "V:|[v0]|", views: forthChildAgeButton)
print("firstChildAgeView.isHidden : \(firstChildAgeView.isHidden ? "YES" : "NO")")
print("secondChildAgeView.isHidden : \(secondChildAgeView.isHidden ? "YES" : "NO")")
print("thirdChildAgeView.isHidden : \(thirdChildAgeView.isHidden ? "YES" : "NO")")
print("forthChildAgeView.isHidden : \(forthChildAgeView.isHidden ? "YES" : "NO")")
containerStackView.addArrangedSubview(firstChildAgeView)
containerStackView.addConstraintsWithFormat(format: "H:|[v0]|", views: firstChildAgeView)
containerStackView.addConstraintsWithFormat(format: "V:[v0(52)]", views: firstChildAgeView)
containerStackView.addArrangedSubview(secondChildAgeView)
containerStackView.addConstraintsWithFormat(format: "H:|[v0]|", views: secondChildAgeView)
containerStackView.addConstraintsWithFormat(format: "V:[v0(52)]", views: secondChildAgeView)
containerStackView.addArrangedSubview(thirdChildAgeView)
containerStackView.addConstraintsWithFormat(format: "H:|[v0]|", views: thirdChildAgeView)
containerStackView.addConstraintsWithFormat(format: "V:[v0(52)]", views: thirdChildAgeView)
containerStackView.addArrangedSubview(forthChildAgeView)
containerStackView.addConstraintsWithFormat(format: "H:|[v0]|", views: forthChildAgeView)
containerStackView.addConstraintsWithFormat(format: "V:[v0(52)]", views: forthChildAgeView)
addConstraintsWithFormat(format: "H:|[v0]|", views: containerStackView)
addConstraintsWithFormat(format: "H:|[v0]|", views: separatorView)
addConstraintsWithFormat(format: "V:|[v0]-10-[v1(1)]|", views: containerStackView, separatorView)
let tempConstraint = NSLayoutConstraint(item: separatorView, attribute: .bottom, relatedBy: .equal, toItem: self, attribute: .bottom, multiplier: 1, constant: 0)
tempConstraint.priority = .defaultLow
NSLayoutConstraint.activate([
containerStackView.leadingAnchor.constraint(equalTo: self.leadingAnchor),
containerStackView.trailingAnchor.constraint(equalTo: self.trailingAnchor),
containerStackView.topAnchor.constraint(equalTo: self.topAnchor),
containerStackView.bottomAnchor.constraint(equalTo: separatorView.topAnchor, constant: -10),
separatorView.leadingAnchor.constraint(equalTo: self.leadingAnchor),
separatorView.trailingAnchor.constraint(equalTo: self.trailingAnchor),
separatorView.heightAnchor.constraint(equalToConstant: 1),
tempConstraint
])
containerStackView.addConstraintsWithFormat(format: "H:|[v0]|", views: titleContainerView)
containerStackView.addConstraintsWithFormat(format: "H:|[v0]|", views: adultContainerView)
containerStackView.addConstraintsWithFormat(format: "H:|[v0]|", c: childrenContainerView)
containerStackView.addConstraintsWithFormat(format: "V:[v0(32)]", views: titleContainerView)
containerStackView.addConstraintsWithFormat(format: "V:[v0(52)]", views: adultContainerView)
containerStackView.addConstraintsWithFormat(format: "V:[v0(52)]", c: childrenContainerView)
titleContainerView.addConstraintsWithFormat(format: "H:|-20-[v0][v1(100)]-20-|", views: numberLabel, removeButton)
titleContainerView.addConstraintsWithFormat(format: "V:|[v0]|", views: numberLabel)
titleContainerView.addConstraintsWithFormat(format: "V:|[v0]|", views: removeButton)
adultContainerView.addConstraintsWithFormat(format: "H:|-20-[v0][v1(28)][v2(60)][v3(28)]-20-|", views: adultLabel, reduceAdultCountButton, adultCountLabel, addAdultCountButton)
adultContainerView.addConstraintsWithFormat(format: "V:|[v0]|", views: adultLabel)
adultContainerView.addConstraintsWithFormat(format: "V:|-12-[v0(28)]-12-|", views: reduceAdultCountButton)
adultContainerView.addConstraintsWithFormat(format: "V:|[v0]|", views: adultCountLabel)
adultContainerView.addConstraintsWithFormat(format: "V:|-12-[v0(28)]-12-|", views: addAdultCountButton)
childrenContainerView.addConstraintsWithFormat(format: "H:|-20-[v0][v1(28)][v2(60)][v3(28)]-20-|", views: childrenLabel,
reduceChildrenCountButton, childrenCountLabel, addChildrenCountButton)
childrenContainerView.addConstraintsWithFormat(format: "V:|[v0]|", views: childrenLabel)
childrenContainerView.addConstraintsWithFormat(format: "V:|-12-[v0(28)]-12-|", views: reduceChildrenCountButton)
childrenContainerView.addConstraintsWithFormat(format: "V:|[v0]|", views: childrenCountLabel)
childrenContainerView.addConstraintsWithFormat(format: "V:|-12-[v0(28)]-12-|", views: addChildrenCountButton)
removeButton.addTarget(self, action: #selector(remove), for: .touchUpInside)
addAdultCountButton.addTarget(self, action: #selector(countChangeAction(sender:)), for: .touchUpInside)
reduceAdultCountButton.addTarget(self, action: #selector(countChangeAction(sender:)), for: .touchUpInside)
addChildrenCountButton.addTarget(self, action: #selector(countChangeAction(sender:)), for: .touchUpInside)
reduceChildrenCountButton.addTarget(self, action: #selector(countChangeAction(sender:)), for: .touchUpInside)
}
func setChildrenAgeViews() {
var childrenViewArray = [firstChildAgeView, secondChildAgeView, thirdChildAgeView, forthChildAgeView]
for index in 0..<4 {
if index < childrenCount {
childrenViewArray[index].isHidden = false
} else {
childrenViewArray[index].isHidden = true
}
}
}
编辑 2:更新警告消息
"<NSLayoutConstraint:0x6000023699a0 V:|-(0)-[containerStackView] (active, names: containerStackView:0x7fa33ad23270, '|':allstay.RoomCountViewCell:0x7fa33c068600'RoomCountViewCell' )>",
"<NSLayoutConstraint:0x600002369900 V:[containerStackView]-(10)-[UIView:0x7fa33ad3d6f0] (active, names: containerStackView:0x7fa33ad23270 )>",
"<NSLayoutConstraint:0x6000023698b0 UIView:0x7fa33ad3d6f0.height == 1 (active)>",
"<NSLayoutConstraint:0x600002369860 V:[UIView:0x7fa33ad3d6f0]-(0)-| (active, names: '|':allstay.RoomCountViewCell:0x7fa33c068600'RoomCountViewCell' )>",
"<NSLayoutConstraint:0x600002369540 roomTitleContainerView.height == 32 (active, names: roomTitleContainerView:0x7fa33ad3c880 )>",
"<NSLayoutConstraint:0x600002369590 roomAdultContainerView.height == 52 (active, names: roomAdultContainerView:0x7fa33ad3d0e0 )>",
"<NSLayoutConstraint:0x6000023692c0 roomChildrenContainerView.height == 52 (active, names: roomChildrenContainerView:0x7fa33ad3d510 )>",
"<NSLayoutConstraint:0x600002369630 firstChildAgeView.height == 52 (active, names: firstChildAgeView:0x7fa33ad435c0 )>",
"<NSLayoutConstraint:0x60000236ac10 secondChildAgeView.height == 52 (active, names: secondChildAgeView:0x7fa33ad43bd0 )>",
"<NSLayoutConstraint:0x60000237ae90 'UISV-canvas-connection' containerStackView.top == roomTitleContainerView.top (active, names: containerStackView:0x7fa33ad23270, roomTitleContainerView:0x7fa33ad3c880 )>",
"<NSLayoutConstraint:0x60000236c140 'UISV-canvas-connection' V:[secondChildAgeView]-(0)-| (active, names: containerStackView:0x7fa33ad23270, secondChildAgeView:0x7fa33ad43bd0, '|':containerStackView:0x7fa33ad23270 )>",
"<NSLayoutConstraint:0x60000236c4b0 'UISV-spacing' V:[roomTitleContainerView]-(10)-[roomAdultContainerView] (active, names: roomAdultContainerView:0x7fa33ad3d0e0, roomTitleContainerView:0x7fa33ad3c880 )>",
"<NSLayoutConstraint:0x60000236c500 'UISV-spacing' V:[roomAdultContainerView]-(0)-[roomChildrenContainerView] (active, names: roomChildrenContainerView:0x7fa33ad3d510, roomAdultContainerView:0x7fa33ad3d0e0 )>",
"<NSLayoutConstraint:0x60000236c550 'UISV-spacing' V:[roomChildrenContainerView]-(0)-[firstChildAgeView] (active, names: firstChildAgeView:0x7fa33ad435c0, roomChildrenContainerView:0x7fa33ad3d510 )>",
"<NSLayoutConstraint:0x60000236c5a0 'UISV-spacing' V:[firstChildAgeView]-(0)-[secondChildAgeView] (active, names: secondChildAgeView:0x7fa33ad43bd0, firstChildAgeView:0x7fa33ad435c0 )>",
"<NSLayoutConstraint:0x6000023777f0 'UIView-Encapsulated-Layout-Height' allstay.RoomCountViewCell:0x7fa33c068600'RoomCountViewCell'.height == 365 (active)>"
最佳答案
首先让我印象深刻的是:去掉你的 heightForRowAt 函数。允许自动布局根据单元格内容的适当约束来处理单元格高度。
不过，看起来您的方向是对的。如果我理解你的布局，你有:
containerStackView(其中包含一些已排列的 subview )，以及separatorView
作为单元格中的两个“顶级”元素。您正在限制:
containerStackView的top 到 cell 的top，containerStackView的底部到separatorView的顶部，以及separatorView的bottom到cell的bottom
哪个应该满足自动布局，并允许自动处理行高——根本不需要在 heightForRowAt 中计算。
关于ios - 隐藏 UIStackview 的 subview 时自动布局冲突，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/56445834/