Playing with UIStackView I encountered a weird issue which does not allow me to add extra arranged subview in nested UIStackView:
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .white
let subViews = [UIColor.gray, UIColor.darkGray, UIColor.lightGray].map { (color) -> UIView in
let v = UIView()
v.backgroundColor = color
return v
}
let redView = UIStackView(arrangedSubviews: subViews)
redView.distribution = .fillEqually
redView.heightAnchor.constraint(lessThanOrEqualToConstant: 100).isActive = true
let blueView = UIView()
blueView.backgroundColor = .blue
let buttons = [UIColor.gray, UIColor.darkGray, UIColor.lightGray].map { (color) -> UIView in
let v = UIView()
v.backgroundColor = color
return v
}
let buttonsView = UIStackView(arrangedSubviews: buttons)
buttonsView.distribution = .fillEqually
buttonsView.heightAnchor.constraint(lessThanOrEqualToConstant: 100).isActive = true
let stackView = UIStackView(arrangedSubviews: [redView, blueView, buttonsView])
view.addSubview(stackView)
stackView.axis = .vertical
stackView.fillSuperview()
}
In result, I get full-stretched blue view instead of expecting behavior:
But when I leaving ONE subview in bottom stack view - it appears as expected
let buttons = [UIColor.gray].map { (color) -> UIView in
let v = UIView()
v.backgroundColor = color
return v
}
let buttonsView = UIStackView(arrangedSubviews: buttons)
buttonsView.distribution = .fillEqually
buttonsView.heightAnchor.constraint(lessThanOrEqualToConstant: 100).isActive = true
let stackView = UIStackView(arrangedSubviews: [redView, blueView, buttonsView])
why ? What is wrong with the code ? Any help or hint is appreciated, I tried translatesAutoresizingMaskIntoConstraints = false on top and bottom stack views as well but without any luck
on the bottom stackview it was required to set
buttonView.heightAnchor.constraint(equalToConstant: 100).isActive = true
instead of
buttonView.heightAnchor.constraint(lessThanOrEqualToConstant: 100).isActive = true
Related
Is it possible to display an image from the assets folder to a uistackview programmatically? If so, how would you go about doing it?
I already know how to create a stack view filled with labels.
fileprivate lazy var stack: UIStackView = {
let stack = UIStackView(arrangedSubviews: [goalCompleteLabel, completeMoreGoalsLabel])
stack.translatesAutoresizingMaskIntoConstraints = false
stack.axis = .vertical
return stack
} ()
First set your image in imageView (set in it its constraints for more control of image dimension) and your label under your class controller:
let image: UIImageView = {
let imageView = UIImageView()
imageView.image = UIImage(named: "yourImage")?.withRenderingMode(.alwaysOriginal)
imageView.backgroundColor = .gray
imageView.layer.cornerRadius = 8
imageView.clipsToBounds = true
imageView.contentMode = .scaleAspectFill
imageView.translatesAutoresizingMaskIntoConstraints = false
imageView.heightAnchor.constraint(equalToConstant: 200).isActive = true
imageView.widthAnchor.constraint(equalToConstant: 200).isActive = true
return imageView
}()
let completeMoreGoalsLabel: UILabel = {
let label = UILabel()
label.text = "Dummytext"
label.textAlignment = .center
return label
}()
now set your stack view with distribution fillProportionally:
lazy var stack: UIStackView = {
let stackView = UIStackView(arrangedSubviews: [image, completeMoreGoalsLabel])
stackView.axis = .vertical
stackView.distribution = .fillProportionally
stackView.translatesAutoresizingMaskIntoConstraints = false
return stackView
}()
in viewDidLoad present your stack and add constraints:
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .darkGray
view.addSubview(stack)
stack.widthAnchor.constraint(equalToConstant: 200).isActive = true
stack.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
stack.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
stack.heightAnchor.constraint(equalToConstant: 250).isActive = true //200 imageHeight + 50 label height
}
I add corner radius on image to make it more cute...
Yes. You simply need to add an ImageView as an arranged subview of your stackview. Just like the labels. Here's the code -
class StackViewController: UIViewController {
var stackView = UIStackView()
var label = UILabel()
var imageView = UIImageView()
override func viewDidLoad() {
super.viewDidLoad()
configStackView()
}
func configStackView() -> Void {
// Add StackView as SubView
view.addSubview(stackView)
// Set StackView properties
stackView.axis = .vertical
stackView.alignment = .center
stackView.distribution = .equalSpacing
// Set imageView as 1st arranged subview of stackview
stackView.addArrangedSubview(imageView)
configImageView()
// Set Label as 2nd arranged subview of stackview
stackView.addArrangedSubview(label)
configLabel()
// Set StackView Constraints
setStackViewCostraints()
}
func setStackViewCostraints() -> Void {
stackView.translatesAutoresizingMaskIntoConstraints = false
stackView.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 20).isActive = true
stackView.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -20).isActive = true
stackView.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
stackView.heightAnchor.constraint(equalToConstant: 200).isActive = true
}
func configImageView() -> Void {
imageView.image = UIImage(named: "bolt")
imageView.contentMode = .scaleAspectFit
// Set Constraints (ideally in a separate function)
imageView.translatesAutoresizingMaskIntoConstraints = false
imageView.widthAnchor.constraint(equalToConstant: 100).isActive = true
}
func configLabel() -> Void {
label.text = "Label"
}
}
Here's the how it renders -
Embedd StackView in ScrollView that is embedded in a main StackView
I am having trouble with a rather complicated detail view that I want to do programmatically. My view hierarchy looks something like this:
Since this might be better explained visualising, I have a screenshot here:
My problem is that I don't know how to set the height constraint on descriptionTextView – right now it's set to 400. What I want though is that it takes up all the space available as the middle item of the main stack view. Once one or more comments are added to the contentStackView, the text field should shrink.
I am not sure which constraints for which views I must set to achieve this...
Here's my take on it so far:
import UIKit
class DetailSampleViewController: UIViewController {
lazy var mainStackView: UIStackView = {
let m = UIStackView()
m.axis = .vertical
m.alignment = .fill
m.distribution = .fill
m.spacing = 10
m.translatesAutoresizingMaskIntoConstraints = false
m.addArrangedSubview(titleTextField)
m.addArrangedSubview(contentScrollView)
m.addArrangedSubview(footerStackView)
return m
}()
lazy var titleTextField: UITextField = {
let t = UITextField()
t.borderStyle = .roundedRect
t.placeholder = "Some Fancy Placeholder"
t.text = "Some Fancy Title"
t.translatesAutoresizingMaskIntoConstraints = false
return t
}()
lazy var contentScrollView: UIScrollView = {
let s = UIScrollView()
s.contentMode = .scaleToFill
s.keyboardDismissMode = .onDrag
s.translatesAutoresizingMaskIntoConstraints = false
s.addSubview(contentStackView)
return s
}()
lazy var contentStackView: UIStackView = {
let s = UIStackView()
s.translatesAutoresizingMaskIntoConstraints = false
s.axis = .vertical
s.alignment = .fill
s.distribution = .equalSpacing
s.spacing = 10
s.contentMode = .scaleToFill
s.addArrangedSubview(descriptionTextView)
s.addArrangedSubview(getCommentLabel(with: "Some fancy comment"))
s.addArrangedSubview(getCommentLabel(with: "Another fancy comment"))
s.addArrangedSubview(getCommentLabel(with: "And..."))
s.addArrangedSubview(getCommentLabel(with: "..even..."))
s.addArrangedSubview(getCommentLabel(with: "...more..."))
s.addArrangedSubview(getCommentLabel(with: "...comments..."))
s.addArrangedSubview(getCommentLabel(with: "Some fancy comment"))
s.addArrangedSubview(getCommentLabel(with: "Another fancy comment"))
s.addArrangedSubview(getCommentLabel(with: "And..."))
s.addArrangedSubview(getCommentLabel(with: "..even..."))
s.addArrangedSubview(getCommentLabel(with: "...more..."))
s.addArrangedSubview(getCommentLabel(with: "...comments..."))
return s
}()
lazy var descriptionTextView: UITextView = {
let tv = UITextView()
tv.font = UIFont.systemFont(ofSize: 17.0)
tv.clipsToBounds = true
tv.layer.cornerRadius = 5.0
tv.layer.borderWidth = 0.25
tv.translatesAutoresizingMaskIntoConstraints = false
tv.text = """
Some fancy textfield text,
spanning over multiple
lines
...
"""
return tv
}()
lazy var footerStackView: UIStackView = {
let f = UIStackView()
f.axis = .horizontal
f.alignment = .fill
f.distribution = .fillEqually
let commentLabel = UILabel()
commentLabel.text = "Comments"
let addCommentButton = UIButton(type: UIButton.ButtonType.system)
addCommentButton.setTitle("Add Comment", for: .normal)
f.addArrangedSubview(commentLabel)
f.addArrangedSubview(addCommentButton)
return f
}()
override func loadView() {
view = UIView()
view.backgroundColor = . systemBackground
navigationController?.isToolbarHidden = true
view.addSubview(mainStackView)
NSLayoutConstraint.activate([
mainStackView.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor, constant: 12),
mainStackView.trailingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.trailingAnchor, constant: -12),
mainStackView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 12),
mainStackView.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor, constant: -12),
titleTextField.heightAnchor.constraint(equalToConstant: titleTextField.intrinsicContentSize.height),
contentStackView.leadingAnchor.constraint(equalTo: contentScrollView.leadingAnchor),
contentStackView.trailingAnchor.constraint(equalTo: contentScrollView.trailingAnchor),
contentStackView.topAnchor.constraint(equalTo: contentScrollView.topAnchor),
contentStackView.bottomAnchor.constraint(equalTo: contentScrollView.bottomAnchor),
descriptionTextView.heightAnchor.constraint(equalToConstant: 400),
descriptionTextView.leadingAnchor.constraint(equalTo: mainStackView.leadingAnchor),
descriptionTextView.trailingAnchor.constraint(equalTo: mainStackView.trailingAnchor),
])
}
override func viewDidLoad() {
super.viewDidLoad()
title = "Detail View"
}
func getCommentLabel(with text: String) -> UILabel {
let l = UILabel()
l.layer.borderWidth = 0.25
l.translatesAutoresizingMaskIntoConstraints = false
l.text = text
return l
}
}
You're close, but a couple notes:
When using stack views - particularly inside scroll views - you sometimes need to explicitly define which elements can be stretched or not, and which elements can be compressed or not.
To get the scroll view filled before it has enough content, you need to set constraints so the combined content height is equal to the scroll view frame's height, but give that constraint a low priority so auto-layout can "break" it when you have enough vertical content.
A personal preference: I'm generally not a fan of adding subviews inside lazy var declarations. It can become confusing when trying to setup constraints.
I've re-worked your posted code to at least get close to what you're going for. It starts with NO comment labels... tapping the "Add Comment" button will add "numbered comment labels" and every third comment will wrap onto multiple lines.
Not really all that much in the way of changes... and I think I added enough comments to make things clear.
class DetailSampleViewController: UIViewController {
lazy var mainStackView: UIStackView = {
let m = UIStackView()
m.axis = .vertical
m.alignment = .fill
m.distribution = .fill
m.spacing = 10
m.translatesAutoresizingMaskIntoConstraints = false
// don't add subviews here
return m
}()
lazy var titleTextField: UITextField = {
let t = UITextField()
t.borderStyle = .roundedRect
t.placeholder = "Some Fancy Placeholder"
t.text = "Some Fancy Title"
t.translatesAutoresizingMaskIntoConstraints = false
return t
}()
lazy var contentScrollView: UIScrollView = {
let s = UIScrollView()
s.contentMode = .scaleToFill
s.keyboardDismissMode = .onDrag
s.translatesAutoresizingMaskIntoConstraints = false
// don't add subviews here
return s
}()
lazy var contentStackView: UIStackView = {
let s = UIStackView()
s.translatesAutoresizingMaskIntoConstraints = false
s.axis = .vertical
s.alignment = .fill
// distribution needs to be .fill (not .equalSpacing)
s.distribution = .fill
s.spacing = 10
s.contentMode = .scaleToFill
// don't add subviews here
return s
}()
lazy var descriptionTextView: UITextView = {
let tv = UITextView()
tv.font = UIFont.systemFont(ofSize: 17.0)
tv.clipsToBounds = true
tv.layer.cornerRadius = 5.0
tv.layer.borderWidth = 0.25
tv.translatesAutoresizingMaskIntoConstraints = false
tv.text = """
Some fancy textfield text,
spanning over multiple lines.
This textView now has a minimum height of 160-pts.
"""
return tv
}()
lazy var footerStackView: UIStackView = {
let f = UIStackView()
f.axis = .horizontal
f.alignment = .fill
f.distribution = .fillEqually
let commentLabel = UILabel()
commentLabel.text = "Comments"
let addCommentButton = UIButton(type: UIButton.ButtonType.system)
addCommentButton.setTitle("Add Comment", for: .normal)
// add a target so we can add comment labels
addCommentButton.addTarget(self, action: #selector(addCommentLabel(_:)), for: .touchUpInside)
// don't allow button height to be compressed
addCommentButton.setContentCompressionResistancePriority(.required, for: .vertical)
f.addArrangedSubview(commentLabel)
f.addArrangedSubview(addCommentButton)
return f
}()
// just for demo - numbers the added comment labels
var commentIndex: Int = 0
// do all this in viewDidLoad(), not in loadView()
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = . systemBackground
navigationController?.isToolbarHidden = true
title = "Detail View"
// add the mainStackView
view.addSubview(mainStackView)
// add elements to mainStackView
mainStackView.addArrangedSubview(titleTextField)
mainStackView.addArrangedSubview(contentScrollView)
mainStackView.addArrangedSubview(footerStackView)
// add contentStackView to contentScrollView
contentScrollView.addSubview(contentStackView)
// add descriptionTextView to contentStackView
contentStackView.addArrangedSubview(descriptionTextView)
// tell contentStackView to be the height of contentScrollView frame
let contentStackHeight = contentStackView.heightAnchor.constraint(equalTo: contentScrollView.frameLayoutGuide.heightAnchor)
// but give it a lower priority do it can grow as comment labels are added
contentStackHeight.priority = .defaultLow
NSLayoutConstraint.activate([
// constrain mainStackView top / bottom / leading / trailing to safe area
mainStackView.leadingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leadingAnchor, constant: 12),
mainStackView.trailingAnchor.constraint(equalTo: view.safeAreaLayoutGuide.trailingAnchor, constant: -12),
mainStackView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 12),
mainStackView.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor, constant: -12),
// title text field
titleTextField.heightAnchor.constraint(equalToConstant: titleTextField.intrinsicContentSize.height),
// minimum height for descriptionTextView
descriptionTextView.heightAnchor.constraint(greaterThanOrEqualToConstant: 160.0),
// constrain contentStackView top / leading / trailing / bottom to contentScrollView
contentStackView.topAnchor.constraint(equalTo: contentScrollView.topAnchor),
contentStackView.leadingAnchor.constraint(equalTo: contentScrollView.leadingAnchor),
contentStackView.trailingAnchor.constraint(equalTo: contentScrollView.trailingAnchor),
contentStackView.bottomAnchor.constraint(equalTo: contentScrollView.bottomAnchor),
// constrain contentStackView width to contentScrollView frame
contentStackView.widthAnchor.constraint(equalTo: contentScrollView.frameLayoutGuide.widthAnchor),
// activate contentStackHeight constraint
contentStackHeight,
])
// during dev, give some background colors so we can see the frames
contentScrollView.backgroundColor = .cyan
descriptionTextView.backgroundColor = .yellow
}
#objc func addCommentLabel(_ sender: Any?) -> Void {
// commentIndex is just used to number the added comments
commentIndex += 1
// let's make every third label end up with multiple lines, just to
// confirm variable-height labels won't mess things up
var s = "This is label \(commentIndex)"
if commentIndex % 3 == 0 {
s += ", and it has enough text that it should need to wrap onto multiple lines, even in landscape orientation."
}
let v = getCommentLabel(with: s)
// don't let comment labels stretch vertically
v.setContentHuggingPriority(.required, for: .vertical)
// don't let comment labels get compressed vertically
v.setContentCompressionResistancePriority(.required, for: .vertical)
contentStackView.addArrangedSubview(v)
// auto-scroll to bottom to show newly added comment label
DispatchQueue.main.asyncAfter(deadline: .now() + 0.01) {
let r = CGRect(x: 0.0, y: self.contentScrollView.contentSize.height - 1.0, width: 1.0, height: 1.0)
self.contentScrollView.scrollRectToVisible(r, animated: true)
}
}
func getCommentLabel(with text: String) -> UILabel {
let l = UILabel()
l.layer.borderWidth = 0.25
l.translatesAutoresizingMaskIntoConstraints = false
l.text = text
// allow wrapping / multi-line comments
l.numberOfLines = 0
return l
}
}
I am using a UIStackView as UITableView's BackGroundView property so when there was an error getting the collection that populates the tableView I can call a function that displays this stack view containing views that show a warning message and a retry button.
I tested doing a similar behaviour in an empty UIViewController so I could center the stackView and its children. The solution worked when I pinned the stack view to the superView's trailing and leading, centered it vertically and set it's top anchor to be greater or equal to the superView's top anchor and similarly it's bottom anchor is greater or equal to the superView's bottom anchor. I have also set the alignment to center and distribution to fill and all seemed to work properly.
Here are some screenshots:
I used this code in a UITableView's extension, but could only reproduce this behaviour. Are there any errors on this code?
func show(error: Bool, withMessage message : String? = nil, andRetryAction retry: (() -> Void)? = nil){
if error{
let iconLabel = UILabel()
iconLabel.GMDIcon = .gmdErrorOutline
iconLabel.textAlignment = .center
iconLabel.numberOfLines = 0
iconLabel.font = iconLabel.font.withSize(50)
iconLabel.textColor = Constants.Colors.ErrorColor
iconLabel.backgroundColor = .blue
let messageLabel = UILabel()
messageLabel.text = message ?? "Ocorreu um erro"
messageLabel.textColor = Constants.Colors.ErrorColor
messageLabel.numberOfLines = 0
messageLabel.textAlignment = .center
messageLabel.font = UIFont(name: "TrebuchetMS", size: 20)
messageLabel.backgroundColor = .green
var views: [UIView] = [iconLabel, messageLabel]
if let retry = retry{
let button = RaisedButton(title: "Tentar novamente")
button.pulseColor = Constants.Colors.PrimaryTextColor
button.backgroundColor = Constants.Colors.PrimaryColor
button.titleColor = .white
button.actionHandle(controlEvents: .touchUpInside, ForAction: retry)
button.contentEdgeInsets = UIEdgeInsetsMake(10,10,10,10)
views.append(button)
}
}else{
self.backgroundView = nil
}
}
let stack = UIStackView()
stack.spacing = 10
stack.axis = .vertical
stack.alignment = .center
stack.distribution = .fill
stack.translatesAutoresizingMaskIntoConstraints = false
for view in views{
view.translatesAutoresizingMaskIntoConstraints = false
stack.addArrangedSubview(view)
}
if self.tableFooterView == nil{
tableFooterView = UIView()
}
self.backgroundView = stack;
if #available(iOS 11, *) {
let guide = self.safeAreaLayoutGuide
stack.topAnchor.constraint(greaterThanOrEqualTo: guide.topAnchor).isActive = true
stack.bottomAnchor.constraint(greaterThanOrEqualTo: guide.bottomAnchor).isActive = true
stack.leadingAnchor.constraint(equalTo: guide.leadingAnchor).isActive = true
stack.trailingAnchor.constraint(equalTo: guide.trailingAnchor).isActive = true
stack.centerYAnchor.constraint(equalTo: guide.centerYAnchor).isActive = true
} else {
stack.topAnchor.constraint(greaterThanOrEqualTo: self.topAnchor).isActive = true
stack.bottomAnchor.constraint(greaterThanOrEqualTo: self.bottomAnchor).isActive = true
stack.leadingAnchor.constraint(equalTo: self.leadingAnchor).isActive = true
stack.trailingAnchor.constraint(equalTo: self.trailingAnchor).isActive = true
stack.centerYAnchor.constraint(equalTo: self.centerYAnchor).isActive = true
}
A stack view knows its height if its elements all have an intrinsic size (ie its the sum of their individual heights + the inter item spacing). In this case because you have a 2 y position constraints, you are implying a height, so your constraints are unsatisfiable. The only y axis constraint you need is center vertically. get rid of the top and bottom constraints. The system will then use the intrinsic size to compute the height of the stack view and center it vertically in the background view. Leave your x axis constraints as is.
Here is my simple example. I have 1 vertical stack view with 1 subview. I want that subviews height to be based on the intrinsic height of the label within it, so that I can maintain a dynamic height for the entire stack view. How can this be done? Thanks
I think you did it right. But here is the keys:
Don't set height for stackView.
Set label top, bottom, left, trailing constraint to view.
Run. It should be okay on simulator.
If you found label's height seems not wrapping (neither both on storyboard or simulator), then change label's Vertical Content Hugging Priority to 750.
Try this code:
class DyanmicTextLabelViewController: UIViewController {
private var didAddConstraint = false
private let label: UILabel = {
let view = UILabel()
view.translatesAutoresizingMaskIntoConstraints = false
view.setContentHuggingPriority(.required, for: .vertical)
view.setContentCompressionResistancePriority(.required, for: .vertical)
view.text = "Layout anchors let you create constraints in an easy-to-read, compact format. They expose a number of methods for creating different types of constraints, as shown in Listing 13-1."
view.numberOfLines = 0
return view
}()
private lazy var container: UIView = {
let view = UIView()
view.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(label)
view.backgroundColor = .red
return view
}()
private lazy var stackview : UIStackView = {
let view = UIStackView()
view.translatesAutoresizingMaskIntoConstraints = false
view.axis = .horizontal
view.distribution = .fill
view.addArrangedSubview(container)
return view
}()
override func loadView() {
super.loadView()
view.addSubview(stackview)
view.setNeedsUpdateConstraints()
view.backgroundColor = .white
}
override func updateViewConstraints() {
super.updateViewConstraints()
if didAddConstraint == false {
didAddConstraint = true
// stackview constraints
stackview.leftAnchor.constraint(equalTo: view.leftAnchor).isActive = true
let topAnchor = stackview.topAnchor.constraint(equalTo: view.topAnchor)
topAnchor.constant = 20
topAnchor.isActive = true
stackview.rightAnchor.constraint(equalTo: view.rightAnchor).isActive = true
// label constraint
// example for giving label a left padding
let labelLeft = label.leftAnchor.constraint(equalTo: container.leftAnchor)
labelLeft.constant = 16.0
labelLeft.isActive = true
label.topAnchor.constraint(equalTo: container.topAnchor).isActive = true
label.rightAnchor.constraint(equalTo: container.rightAnchor).isActive = true
label.bottomAnchor.constraint(equalTo: container.bottomAnchor).isActive = true
}
}
}
The important part here is the initialization of stackview, label & constraint set on label
label initialization
private let label: UILabel = {
let view = UILabel()
view.translatesAutoresizingMaskIntoConstraints = false
view.setContentHuggingPriority(.required, for: .vertical)
view.setContentCompressionResistancePriority(.required, for: .vertical)
view.text = "Layout anchors let you create constraints in an easy-to-read, compact format. They expose a number of methods for creating different types of constraints, as shown in Listing 13-1."
view.numberOfLines = 0
return view
}()
stackview initialization
private lazy var stackview : UIStackView = {
let view = UIStackView()
view.translatesAutoresizingMaskIntoConstraints = false
view.axis = .horizontal
view.distribution = .fill
view.addArrangedSubview(container)
return view
}()
label constraint
// label constraint
// example for giving label a left padding
let labelLeft = label.leftAnchor.constraint(equalTo: container.leftAnchor)
labelLeft.constant = 16.0
labelLeft.isActive = true
label.topAnchor.constraint(equalTo: container.topAnchor).isActive = true
label.rightAnchor.constraint(equalTo: container.rightAnchor).isActive = true
label.bottomAnchor.constraint(equalTo: container.bottomAnchor).isActive = true
This settings could be easily translated to storyboard.
I have a display of horizontal stack views, which subviews consists on a label and a textField. the stackView is constrained with the borders of the view
I'm trying to stretch my textField subview to so it fills the remaining space of the stack, while the label's stacks adjusts to fit the label size itself. But the inverse is happening. I've tried many solutions but nothing helped me. All the views and constraints we're made programmatically.
For my stack, I'm using:
func customTextField() -> UIStackView {
let stack: UIStackView = {
let sv = UIStackView()
sv.axis = .horizontal
sv.isLayoutMarginsRelativeArrangement = true
sv.alignment = .leading
sv.backgroundColor = .red
sv.translatesAutoresizingMaskIntoConstraints = false
return sv
}()
let label: UILabel = {
let lb = UILabel()
lb.backgroundColor = .red
lb.text = "Label is here"
lb.translatesAutoresizingMaskIntoConstraints = false
return lb
}()
let textField: UITextField = {
let tf = UITextField()
tf.backgroundColor = .blue
tf.text = "Text Field"
tf.translatesAutoresizingMaskIntoConstraints = false
return tf
}()
stack.addArrangedSubview(label)
stack.addArrangedSubview(textField)
return stack
}
the caller of my customTextField:
let profileUserStack: UIStackView = {
let stack = UIStackView()
stack.axis = .vertical
stack.spacing = 8
stack.contentMode = .scaleToFill
stack.translatesAutoresizingMaskIntoConstraints = false
return stack
}()
self.addSubview(profileUserStack)
for i in profileTextViews {
let view = self.customTextField()
profileUserStack.addArrangedSubview(view)
}
constraints.append(profileUserStack.buildConstraint(toItem: perfilImageView, constant: 32, type: .top, baseItem: .bottom))
constraints.append(profileUserStack.buildConstraint(toItem: self, constant: 16, type: .leading, baseItem: .leading))
constraints.append(profileUserStack.buildConstraint(toItem: self, constant: -16, type: .trailing, baseItem: .trailing))
activateConstraints(&constraints, to: self)
The results:
https://imgur.com/a/ccFZlRM
Notice that's exactly what I want to achieve. But I want the textField to be stretched.
Set contentHuggingPriority to your label such that it always stays as the size of its content and textField takes remaining space.
label.setContentHuggingPriority(.defaultHigh, for: .horizontal)