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ios - 如何通过 SnapKit 更新高度约束并更新单元格高度?

转载 作者:可可西里 更新时间:2023-11-01 00:54:29 54 4
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我有一个 TableViewCell 和两个按钮来切换不同的约束。
我想更新它的高度约束和单元格高度。
喜欢下面的图1
当我点击 buttonB 时, View 会像 pic2
然后我点击buttonA, View 会回到pic1
我尝试修改约束,但无法更新高度。
有什么想法或回答我吗?
谢谢

图1

enter image description here

图2

enter image description here

代码如下:

class CellContainView: UIView {

let buttonA: UIButton = { () -> UIButton in
let ui = UIButton()
ui.titleLabel?.numberOfLines = 0
ui.setTitle("Click\nA", for: .normal)
ui.backgroundColor = UIColor.blue
return ui
}()

let buttonB: UIButton = { () -> UIButton in
let ui = UIButton()
ui.titleLabel?.numberOfLines = 0
ui.setTitle("Click\nB", for: .normal)
ui.backgroundColor = UIColor.gray
return ui
}()

let buttonC: UIButton = { () -> UIButton in
let ui = UIButton()
ui.titleLabel?.numberOfLines = 0
ui.setTitle("Click\nC", for: .normal)
ui.backgroundColor = UIColor.brown
return ui
}()

let labelA: UILabel = { () -> UILabel in
let ui = UILabel()
ui.text = "Test"
return ui
}()

let viewA: UIView = { () -> UIView in
let ui = UIView()
ui.backgroundColor = UIColor.red
return ui
}()

override init(frame: CGRect) {
super.init(frame: frame)

addUI()
addConstrain()
}

required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}

func addUI() {

self.addSubview(buttonA)
self.addSubview(buttonB)
self.addSubview(buttonC)
self.addSubview(labelA)
self.addSubview(viewA)

}

func addConstrain() {

buttonA.snp.makeConstraints { (make) in
make.left.top.equalToSuperview()
make.height.equalTo(60)
}

buttonB.snp.makeConstraints { (make) in
make.left.equalTo(buttonA.snp.right)
make.top.right.equalToSuperview()
make.width.equalTo(buttonA.snp.width)
make.height.equalTo(buttonA.snp.height)
}

buttonC.snp.makeConstraints { (make) in
make.left.equalTo(15)
make.right.equalTo(-15)
make.bottom.equalTo(-15)
make.height.equalTo(50)
}

labelA.snp.makeConstraints { (make) in
make.left.equalTo(15)
make.top.equalTo(buttonA.snp.bottom).offset(15)
make.width.equalTo(195)
make.height.equalTo(50)
}

viewA.snp.makeConstraints { (make) in
make.left.equalTo(labelA.snp.right)
make.top.equalTo(buttonA.snp.bottom).offset(15)
make.right.equalTo(-15)
make.height.equalTo(50)
make.bottom.equalTo(buttonC.snp.top).offset(-10)
}
}

func updateConstrain(sender: UIButton) {

switch sender {
case buttonA:

viewA.snp.updateConstraints { (make) in
make.height.equalTo(50)
}

case buttonB:

viewA.snp.updateConstraints { (make) in
make.height.equalTo(150)
}

default:
break
}

}

}


class TestTableViewCell: UITableViewCell {

let cellContainView: CellContainView = { () -> CellContainView in
let ui = CellContainView()
ui.backgroundColor = UIColor.orange
return ui
}()

override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
super.init(style: style, reuseIdentifier: reuseIdentifier)

self.addSubview(cellContainView)

cellContainView.snp.makeConstraints { (make) in
make.left.top.equalTo(15)
make.bottom.right.equalTo(-15)
}

}

required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}

}


class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {

let tableView: UITableView = { () -> UITableView in
let ui = UITableView()
return ui
}()

override func viewDidLoad() {
super.viewDidLoad()

tableView.delegate = self
tableView.dataSource = self
tableView.rowHeight = UITableViewAutomaticDimension
tableView.estimatedRowHeight = 44
tableView.register(TestTableViewCell.self, forCellReuseIdentifier: "TestTableViewCell")
tableView.tableFooterView = UIView()

self.view.addSubview(tableView)
tableView.snp.makeConstraints { (make) in
make.top.left.right.bottom.equalToSuperview()
}
}

@objc func buttonAClicked(sender: UIButton) {

let index = IndexPath(row: 0, section: 0)
let cell = tableView.cellForRow(at: index) as! TestTableViewCell
cell.cellContainView.updateConstrain(sender: sender)
tableview.reloadData()
}

@objc func buttonBClicked(sender: UIButton) {

let index = IndexPath(row: 0, section: 0)
let cell = tableView.cellForRow(at: index) as! TestTableViewCell
cell.cellContainView.updateConstrain(sender: sender)
tableview.reloadData()
}

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 1
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

let cell = tableView.dequeueReusableCell(withIdentifier: "TestTableViewCell", for: indexPath) as! TestTableViewCell

cell.cellContainView.buttonA.addTarget(self, action: #selector(buttonAClicked), for: .touchUpInside)
cell.cellContainView.buttonB.addTarget(self, action: #selector(buttonBClicked), for: .touchUpInside)

return cell
}

}

点击butttonB时更新约束问题(添加更新viewA heightConstrain & tableview.reloadData()):

TestCellUpdateHeight[29975:5195310] [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.
(
"<SnapKit.LayoutConstraint:0x6040000a4320@CellContainView.swift#75 UIButton:0x7fa1d0d0d680.height == 60.0>",
"<SnapKit.LayoutConstraint:0x6040000a49e0@CellContainView.swift#89 UIButton:0x7fa1d0d10610.height == 50.0>",
"<SnapKit.LayoutConstraint:0x6040000a51c0@CellContainView.swift#104 UIView:0x7fa1d0d11130.height == 150.0>",
"<SnapKit.LayoutConstraint:0x6040000a4800@CellContainView.swift#80 UIButton:0x7fa1d0d0f7b0.top == TestCellUpdateHeight.CellContainView:0x7fa1d0d0d470.top>",
"<SnapKit.LayoutConstraint:0x6040000a4a40@CellContainView.swift#82 UIButton:0x7fa1d0d0f7b0.height == UIButton:0x7fa1d0d0d680.height>",
"<SnapKit.LayoutConstraint:0x6040000a4ec0@CellContainView.swift#88 UIButton:0x7fa1d0d10610.bottom == TestCellUpdateHeight.CellContainView:0x7fa1d0d0d470.bottom - 15.0>",
"<SnapKit.LayoutConstraint:0x6040000a5100@CellContainView.swift#102 UIView:0x7fa1d0d11130.top == UIButton:0x7fa1d0d0f7b0.bottom + 15.0>",
"<SnapKit.LayoutConstraint:0x6040000a5220@CellContainView.swift#105 UIView:0x7fa1d0d11130.bottom == UIButton:0x7fa1d0d10610.top - 10.0>",
"<SnapKit.LayoutConstraint:0x6040000a52e0@TestTableViewCell.swift#26 TestCellUpdateHeight.CellContainView:0x7fa1d0d0d470.top == TestCellUpdateHeight.TestTableViewCell:0x7fa1d208a000.top + 15.0>",
"<SnapKit.LayoutConstraint:0x6040000a53a0@TestTableViewCell.swift#27 TestCellUpdateHeight.CellContainView:0x7fa1d0d0d470.bottom == TestCellUpdateHeight.TestTableViewCell:0x7fa1d208a000.bottom - 15.0>",
"<NSLayoutConstraint:0x6080002819f0 'UIView-Encapsulated-Layout-Height' TestCellUpdateHeight.TestTableViewCell:0x7fa1d208a000'TestTableViewCell'.height == 230 (active)>"
)

Will attempt to recover by breaking constraint

最佳答案

一般来说,要更新 uiview:UIView 的高度约束,您应该先保存它:

var viewHeightConstraint: Constraint!
uiview.snp.makeConstraints { (make) in
viewHeightConstraint = make.height.equalTo(50).constraint
}

如果您只是简单地使用updateConstraints 函数,它会添加一个新的高度约束,从而导致问题Unable to simultaneously satisfy constraints。所以你必须删除最后一个:

viewHeightConstraint.deactivate()

然后再次进行约束:

uiview.snp.makeConstraints { (make) in
viewHeightConstraint = make.height.equalTo(100).constraint
}

关于ios - 如何通过 SnapKit 更新高度约束并更新单元格高度?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/53007231/

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