I I’m creating UITableViewCell utilizing programmatical constrains. The decision has a cardView and a button. The cardView alone works positive. However as soon as I add UIButton to there then I can see the error on the console.
Full Code:
import UIKit
class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
non-public lazy var tableView: UITableView = {
let view = UITableView()
self.view.addSubview(view)
view.translatesAutoresizingMaskIntoConstraints = false
view.leftAnchor.constraint(equalTo: self.view.leftAnchor).isActive = true
view.rightAnchor.constraint(equalTo: self.view.rightAnchor).isActive = true
view.topAnchor.constraint(equalTo: self.view.safeAreaLayoutGuide.topAnchor).isActive = true
view.bottomAnchor.constraint(equalTo: self.view.safeAreaLayoutGuide.bottomAnchor).isActive = true
return view
}()
override func viewDidLoad() {
tremendous.viewDidLoad()
tableView.register(Cell.self, forCellReuseIdentifier: "Cell")
tableView.separatorStyle = .none
tableView.delegate = self
tableView.dataSource = self
}
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection part: Int) -> Int {
return 1
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell: Cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! Cell
cell.configure()
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
print("chosen: (indexPath.row)")
}
}
non-public ultimate class Cell: UITableViewCell {
override init(model: UITableViewCell.CellStyle, reuseIdentifier: String?) {
tremendous.init(model: model, reuseIdentifier: reuseIdentifier)
self.backgroundColor = .clear
self.selectionStyle = .none
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been applied")
}
non-public lazy var cardView: UIView = {
let view = UIView()
self.contentView.addSubview(view)
view.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
view.leftAnchor.constraint(equalTo: self.contentView.leftAnchor, constant: 18),
view.topAnchor.constraint(equalTo: self.contentView.topAnchor, constant: 9),
view.rightAnchor.constraint(equalTo: self.contentView.rightAnchor, constant: -18),
view.bottomAnchor.constraint(equalTo: self.contentView.bottomAnchor, constant: -9),
view.heightAnchor.constraint(equalToConstant: 60)
])
view.layer.cornerRadius = 8
view.layer.borderColor = UIColor.lightGray.withAlphaComponent(0.7).cgColor
view.layer.borderWidth = 1.0
return view
}()
non-public(set) lazy var buttonOptions: UIButton = {
let button = UIButton()
self.cardView.addSubview(button)
button.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
button.widthAnchor.constraint(equalToConstant: 22),
button.heightAnchor.constraint(equalToConstant: 18),
button.centerXAnchor.constraint(equalTo: self.cardView.centerXAnchor),
button.centerYAnchor.constraint(equalTo: self.cardView.centerYAnchor)
])
button.backgroundColor = UIColor.lightGray.withAlphaComponent(0.6)
button.setImage(UIImage(systemName: "ellipsis")!, for: .regular)
button.imageView?.tintColor = UIColor.lightGray
return button
}()
func configure() {
self.cardView.backgroundColor = .white
self.buttonOptions.isHidden = false
}
}
Error:
[LayoutConstraints] Unable to concurrently fulfill constraints.
In all probability at the very least one of many constraints within the following checklist is one you do not need.
Do that:
(1) take a look at every constraint and check out to determine which you do not count on;
(2) discover the code that added the undesirable constraint or constraints and repair it.
(
"<NSLayoutConstraint:0x6000005b7480 V:|-(9)-[UIView:0x7ff5ac9066e0] (lively, names: '|':UITableViewCellContentView:0x7ff5ac90d4d0 )>",
"<NSLayoutConstraint:0x6000005b7520 UIView:0x7ff5ac9066e0.backside == UITableViewCellContentView:0x7ff5ac90d4d0.backside - 9 (lively)>",
"<NSLayoutConstraint:0x6000005b7570 UIView:0x7ff5ac9066e0.top == 60 (lively)>",
"<NSLayoutConstraint:0x60000059c3c0 'UIView-Encapsulated-Structure-Peak' UITableViewCellContentView:0x7ff5ac90d4d0.top == 44 (lively)>"
)
Will try and get well by breaking constraint
<NSLayoutConstraint:0x6000005b7570 UIView:0x7ff5ac9066e0.top == 60 (lively)>
Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this within the debugger.
The strategies within the UIConstraintBasedLayoutDebugging class on UIView listed in <UIKitCore/UIView.h> can also be useful.
Within the cell config, If I remark self.buttonOptions.isHidden = false then I do not see any warnings. I’m not certain what’s the factor I’m lacking right here, Please assist me out to resolve this downside.