So I am trying to constraint a view inside a UICollectionViewCell but it seems like the constraints are not applied at all
This is my custom cell class:
class MyCustomCell: UICollectionViewCell {
var message: String?
var messageView: UILabel = {
let label = UILabel()
label.translatesAutoresizingMaskIntoConstraints = false
label.textColor = .black
label.textAlignment = .left
label.numberOfLines = 0
return label
}()
var cardView: UIView = {
var cardView = UIView()
cardView.translatesAutoresizingMaskIntoConstraints = false
return UIView()
}()
override init(frame: CGRect) {
super.init(frame: frame)
self.addSubview(cardView)
cardView.addSubview(messageView)
setupCardView()
setupMessageLabel()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func setupCardView() {
NSLayoutConstraint.activate([
cardView.topAnchor.constraint(equalTo: self.topAnchor, constant: 5),
cardView.bottomAnchor.constraint(equalTo: self.bottomAnchor),
cardView.leftAnchor.constraint(equalTo: self.leftAnchor, constant: 10),
cardView.rightAnchor.constraint(equalTo: self.rightAnchor, constant: -10)
])
cardView.layer.cornerRadius = 20.0
cardView.layer.shadowColor = #colorLiteral(red: 0.2549019754, green: 0.2745098174, blue: 0.3019607961, alpha: 1)
cardView.layer.shadowOffset = CGSize(width: 0.0, height: 0.0)
cardView.layer.shadowRadius = 12.0
cardView.layer.shadowOpacity = 0.7
cardView.backgroundColor = #colorLiteral(red: 0.7490196078, green: 0.3529411765, blue: 0.9490196078, alpha: 1)
}
}
The constraints are completely ignored and I get a completely white screen
NOTE: My custom cell is wired correctly as I tried to add a label and it works properly even with constraints
The problem is solved now when I added
cardView.translatesAutoresizingMaskIntoConstraints = false
right before my constraints...
But why doesn't it work when I initialize my UIView this way
var cardView: UIView = {
var cardView = UIView()
cardView.translatesAutoresizingMaskIntoConstraints = false
return UIView()
}()
Anyone any idea?
EDIT: As you can see in the comments the problem was that I have
return UIView()
instead of
return cardView
in my cardView variable...
Related
I have a subclass of UIButton and it have an initialiser that accept a name and boolean. I have a function to toggle the hide and show imageView, and my auto layout set to when imageView hidden the anchor move into another imageView. I use the content hugging priority programmatically in this. so here is my code, can you show me why my uiimageView not hiding.
// This is in my subclass of UIButton
let profileLbl = UILabel()
let badgeImageView = UIImageView()
let rightArrowImageView = UIImageView()
var isHiddenBadge = false
var visibleProfileTrailingConstraint: NSLayoutConstraint!
var hiddenProfileTrailingConstraint: NSLayoutConstraint!
override init(frame: CGRect) {
super.init(frame: frame)
backgroundColor = .white
configure()
}
init(name: String, isBadgeHidden: Bool = false) {
super.init(frame: .zero)
profileLbl.text = name
profileLbl.font = UIFont(name: "NunitoSans-SemiBold", size: 16)
profileLbl.textColor = #colorLiteral(red: 0.2, green: 0.2, blue: 0.2, alpha: 1)
isHiddenBadge = isBadgeHidden
toggleHide(badge: isHiddenBadge)
configure()
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
private func configure() {
translatesAutoresizingMaskIntoConstraints = false
[profileLbl, badgeImageView, rightArrowImageView].forEach({ v in
v.translatesAutoresizingMaskIntoConstraints = false
addSubview(v)
})
visibleProfileTrailingConstraint = profileLbl.trailingAnchor.constraint(equalTo: badgeImageView.leadingAnchor, constant: -5)
hiddenProfileTrailingConstraint = profileLbl.trailingAnchor.constraint(equalTo: rightArrowImageView.leadingAnchor, constant: -5)
visibleProfileTrailingConstraint.priority = .defaultHigh
hiddenProfileTrailingConstraint.priority = .defaultLow
badgeImageView.image = #imageLiteral(resourceName: "warning_error 1")
rightArrowImageView.image = #imageLiteral(resourceName: "ic-arrow-right")
NSLayoutConstraint.activate([
profileLbl.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 24),
profileLbl.centerYAnchor.constraint(equalTo: centerYAnchor),
visibleProfileTrailingConstraint,
hiddenProfileTrailingConstraint,
badgeImageView.centerYAnchor.constraint(equalTo: centerYAnchor),
badgeImageView.widthAnchor.constraint(equalToConstant: 24),
badgeImageView.heightAnchor.constraint(equalToConstant: 24),
rightArrowImageView.trailingAnchor.constraint(equalTo: trailingAnchor, constant: -24),
rightArrowImageView.centerYAnchor.constraint(equalTo: centerYAnchor),
rightArrowImageView.widthAnchor.constraint(equalToConstant: 16),
rightArrowImageView.heightAnchor.constraint(equalToConstant: 16)
])
}
private func toggleHide(badge: Bool) {
if badge == false {
if badgeImageView.isHidden {
badgeImageView.isHidden = false
visibleProfileTrailingConstraint.priority = .defaultHigh
hiddenProfileTrailingConstraint.priority = .defaultLow
}
} else {
visibleProfileTrailingConstraint.priority = .defaultLow
hiddenProfileTrailingConstraint.priority = .defaultHigh
badgeImageView.isHidden = true
}
}
// I initialise it in my viewController
let infoBtn = GTProfileBtn(name: "Basic Info", isBadgeHidden: false)
// this is when I try to test it in my viewDidLoad
infoBtn.isHiddenBadge = true
Use following
var isHiddenBadge = false {
didSet {
toggleHide(badge: isHiddenBadge)
}
}
The problem is you not calling toggleHide after setting isHiddenBadge. The above code will solve the issue.
I am in the process of implementing a UILabel as a subview of a UITextField which will be shown right above the UITextField itself. The UITextField has a rounded border and what I would like to achieve is the UILabel to be shown over the border.
Everything currently works as expected, but the UILabel is drawn behind the border of the UITextField. I want it to go "over" (above) the border so the white backgroundColor would be shown above part of the border and make the text more easily readible.
var priceTextField: CustomTextField = {
let priceTextField = CustomTextField()
priceTextField.layer.cornerRadius = 10.0
priceTextField.layer.borderWidth = 1.0
priceTextField.layer.borderColor = UIColor.darkGray.cgColor
priceTextField.translatesAutoresizingMaskIntoConstraints = false
priceTextField.font = UIFont.systemFont(ofSize: 15)
priceTextField.textColor = .black
priceTextField.text = "0"
priceTextField.suffix = "EUR"
priceTextField.suffixTextColor = .darkGray
priceTextField.suffixSpacing = 2.0
priceTextField.textAlignment = .center
priceTextField.labelText = "Price"
return priceTextField
}()
In my CustomTextField class (subclass of UITextField):
public var labelText: String?
var topLabel: UILabel = {
let topLabel = UILabel()
topLabel.translatesAutoresizingMaskIntoConstraints = false
topLabel.textAlignment = .center
topLabel.font = UIFont.systemFont(ofSize: 12)
topLabel.textColor = .lightGray
topLabel.backgroundColor = .white
topLabel.numberOfLines = 1
return topLabel
}()
func setupLabel() {
self.addSubview(topLabel)
topLabel.centerYAnchor.constraint(equalTo: self.topAnchor).isActive = true
topLabel.leadingAnchor.constraint(equalTo: self.leadingAnchor, constant: 20).isActive = true
topLabel.trailingAnchor.constraint(equalTo: self.trailingAnchor, constant: -20).isActive = true
topLabel.text = labelText
}
I call setupLabel() at the end of the draw(_ rect: CGRect) method of UITextField (because I work with this to show the EUR sign always behind the entered value).
I have tried to play around with bringSubviewToFront and changing the zPosition of the layer of the UILabel, without success.
It now looks like this:
How can I bring the text "above" the border on the top?
EDIT: Tried Sh_Khan's solution, but it's still hidden behind the border.
import Foundation
import UIKit
public class CustomTextView: UIView, UITextFieldDelegate {
public var labelText: String?
var customTextField: CustomTextField = {
let customTextField = CustomTextField()
customTextField.translatesAutoresizingMaskIntoConstraints = false
customTextField.font = UIFont.systemFont(ofSize: 15)
customTextField.textColor = .black
customTextField.textAlignment = .center
customTextField.text = "0"
customTextField.suffix = "EUR"
customTextField.suffixTextColor = .lightGray
customTextField.suffixSpacing = 2.0
return customTextField
}()
var topLabel: UILabel = {
let topLabel = UILabel()
topLabel.translatesAutoresizingMaskIntoConstraints = false
topLabel.font = UIFont.systemFont(ofSize: 12)
topLabel.textColor = .darkGray
topLabel.numberOfLines = 1
topLabel.backgroundColor = .red
topLabel.textAlignment = .center
return topLabel
}()
override public init(frame: CGRect) {
super.init(frame: frame)
setupBorders()
}
public override func layoutSubviews() {
setupViews()
}
func setupBorders() {
self.layer.cornerRadius = 10.0
self.layer.borderColor = UIColor.lightGray.cgColor
self.layer.borderWidth = 1.0
}
func setupViews() {
addSubview(topLabel)
// insertSubview(topLabel, aboveSubview: customTextField)
insertSubview(customTextField, belowSubview: topLabel)
customTextField.topAnchor.constraint(equalTo: topAnchor).isActive = true
customTextField.leadingAnchor.constraint(equalTo: leadingAnchor).isActive = true
customTextField.trailingAnchor.constraint(equalTo: trailingAnchor).isActive = true
customTextField.bottomAnchor.constraint(equalTo: bottomAnchor).isActive = true
topLabel.centerYAnchor.constraint(equalTo: topAnchor).isActive = true
topLabel.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 10).isActive = true
topLabel.trailingAnchor.constraint(equalTo: trailingAnchor, constant: -10).isActive = true
topLabel.text = labelText
}
public required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
setupViews()
}
}
You can try to organize it by creating a UIView subclass , so everything appear properly in it's order of adding
class CustomView: UIView {
var priceTextField: CustomTextField = {
let priceTextField = CustomTextField()
priceTextField.layer.cornerRadius = 10.0
priceTextField.layer.borderWidth = 1.0
priceTextField.layer.borderColor = UIColor.darkGray.cgColor
priceTextField.translatesAutoresizingMaskIntoConstraints = false
priceTextField.font = UIFont.systemFont(ofSize: 15)
priceTextField.textColor = .black
priceTextField.text = "0"
priceTextField.suffix = "EUR"
priceTextField.suffixTextColor = .darkGray
priceTextField.suffixSpacing = 2.0
priceTextField.textAlignment = .center
priceTextField.labelText = "Price"
return priceTextField
}()
var topLabel: UILabel = {
let topLabel = UILabel()
topLabel.translatesAutoresizingMaskIntoConstraints = false
topLabel.textAlignment = .center
topLabel.font = UIFont.systemFont(ofSize: 12)
topLabel.textColor = .lightGray
topLabel.backgroundColor = .white
topLabel.numberOfLines = 1
return topLabel
}()
var lableStr:String?
init(frame: CGRect,lblTex:String) {
super.init(frame: frame)
lableStr = lblTex
createSubviews()
}
override init(frame: CGRect) {
super.init(frame: frame)
createSubviews()
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
createSubviews()
}
func createSubviews() {
// all the layout code from above
// add the textfield then the label and set constraints properly
}
}
According to the Apple specification: It is composited above the receiver’s contents and sublayers.
So, the border will always be above all subviews, even if one brings the subview to the front and so on.
So one needs to make a background view to fake the border.
similar to Stackoverflow Question
Example:
Here self is "TextField"
activeborderView is "UiView"
activeborderView.frame = CGRect.init(x: -1, y: -1, width: self.frame.size.width+2, height: self.frame.size.height+2)
activeborderView.translatesAutoresizingMaskIntoConstraints = false
self.addSubview(activeborderView)
activeborderView.topAnchor.constraint(equalTo: self.topAnchor, constant:-1).isActive = true // Place our label 10 pts above the text field
activeborderView.leftAnchor.constraint(equalTo: self.leftAnchor, constant: -1).isActive=true
activeborderView.heightAnchor.constraint(equalToConstant: self.frame.size.height+2).isActive=true
activeborderView.widthAnchor.constraint(equalToConstant: self.frame.size.width+2).isActive=true
activeborderView.layer.borderWidth = 3
activeborderView.layer.borderColor = CustomColor.blue().cgColor
activeborderView.layer.cornerRadius = 5
activeborderView.backgroundColor = .white
self.sendSubviewToBack(activeborderView)
self.setNeedsDisplay()
Introduction
I'm creating an app which uses a custom view in which I have a UIStackView to sort out 5 UIControls. When a user taps one of the UIControls an underscore line gets animated, sliding under the tapped UIControl.
However, for some reason the method/selector for these UIControls no longer gets called. I believe this has to do with that I updated my Mac to the macOS (and Xcode) update released this week (wk.44). (updated from swift 4.2 to swift 4.2.1). Before the updated this animation and selector worked perfectly. But I'm not sure. And I'm now completely stuck on what I'm doing wrong.
Context
I created a playground and scaled down everything as much as I could and the issue persists.
I have tried to define the UIStackView in the global scope of my SetupView class but it doesn't change anything. So I believe it is not an issue of the stackView or its subviews being deallocated?
Below I've provided my UIControl subclass and my SetupView (UIView subclass) that I use. I've created a playground so you may copy paste in Xcode playground to test if you want.
Question
Why doesn't the method goalViewControlTapped(_ sender: SetupViewControl) get called?
Code
import UIKit
import PlaygroundSupport
class SetupViewControl: UIControl {
let titleLabel : UILabel = {
let lbl = UILabel()
lbl.font = UIFont(name: "Futura", size: 14)
lbl.textColor = .white
lbl.backgroundColor = .clear
lbl.textAlignment = .center
lbl.translatesAutoresizingMaskIntoConstraints = false
return lbl
}()
override init(frame: CGRect) {
super.init(frame: frame)
setupLabel()
layer.cornerRadius = 5
}
fileprivate func setupLabel() {
addSubview(titleLabel)
titleLabel.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 5).isActive = true
titleLabel.trailingAnchor.constraint(equalTo: trailingAnchor, constant: -5).isActive = true
titleLabel.centerYAnchor.constraint(equalTo: centerYAnchor).isActive = true
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override var isHighlighted: Bool {
didSet {
UIView.animate(withDuration: 0.12) {
self.backgroundColor = self.isHighlighted ? UIColor.lightGray : UIColor.clear
}
}
}
}
class SetupView: UIView {
let dataModel : [String] = ["2 weeks", "1 month", "2 months", "6 months", "1 year"]
var selectionLineCenterX : NSLayoutConstraint!
let selectionLine = UIView()
let labelZero = SetupViewControl()
let labelOne = SetupViewControl()
let labelTwo = SetupViewControl()
let labelThree = SetupViewControl()
let labelFour = SetupViewControl()
let labelFive = SetupViewControl()
lazy var controlArray = [self.labelZero, self.labelOne, self.labelTwo, self.labelThree, self.labelFour, self.labelFive]
init(frame: CGRect, color: UIColor) {
super.init(frame: frame)
self.backgroundColor = color
setupView()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
fileprivate func setupView() {
layer.cornerRadius = 0
layer.borderColor = UIColor.black.cgColor
layer.borderWidth = 1
setupLabelText()
setupControlsInStackView()
}
fileprivate func setupLabelText() {
for num in 0...(dataModel.count - 1) {
controlArray[num].titleLabel.text = dataModel[num]
}
}
// let stackView = UIStackView(frame: .zero) I have tried to declare the stackView here but it doesn't fix my issue.
func setupControlsInStackView() {
var stackViewArray = [SetupViewControl]()
for num in 0...(dataModel.count - 1) {
controlArray[num].isUserInteractionEnabled = true
controlArray[num].addTarget(self, action: #selector(goalViewControlTapped(_:)), for: .touchUpInside)
stackViewArray.append(controlArray[num])
}
let stackView = UIStackView(arrangedSubviews: stackViewArray)
stackView.alignment = .fill
stackView.distribution = .fillEqually
stackView.axis = .horizontal
stackView.translatesAutoresizingMaskIntoConstraints = false
addSubview(stackView)
stackView.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 8).isActive = true
stackView.trailingAnchor.constraint(equalTo: trailingAnchor, constant: -8).isActive = true
stackView.topAnchor.constraint(equalTo: topAnchor, constant: 15).isActive = true
addSubview(selectionLine)
selectionLine.backgroundColor = .white
selectionLine.translatesAutoresizingMaskIntoConstraints = false
selectionLine.heightAnchor.constraint(equalToConstant: 1).isActive = true
selectionLine.topAnchor.constraint(equalTo: stackView.bottomAnchor).isActive = true
selectionLine.widthAnchor.constraint(equalToConstant: 50).isActive = true
selectionLineCenterX = selectionLine.centerXAnchor.constraint(equalTo: leadingAnchor, constant: -100)
selectionLineCenterX.isActive = true
}
#objc fileprivate func goalViewControlTapped(_ sender: SetupViewControl) {
print("This is not getting printed!!!")
selectionLineCenterX.isActive = false
selectionLineCenterX = selectionLine.centerXAnchor.constraint(equalTo: sender.centerXAnchor)
selectionLineCenterX.isActive = true
UIView.animate(withDuration: 0.25, delay: 0, usingSpringWithDamping: 0.8, initialSpringVelocity: 0.5, options: .curveEaseIn, animations: {
self.layoutIfNeeded()
}, completion: nil)
}
}
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .white
let testView = SetupView(frame: .zero, color: UIColor.blue)
view.addSubview(testView)
testView.translatesAutoresizingMaskIntoConstraints = false
testView.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
testView.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
testView.heightAnchor.constraint(equalToConstant: 100).isActive = true
testView.widthAnchor.constraint(equalToConstant: 365).isActive = true
}
}
// For live view in playground
let vc = ViewController()
vc.preferredContentSize = CGSize(width: 375, height: 812)
PlaygroundPage.current.liveView = vc
Thanks for reading my question.
Does your UIStackView show as having an ambiguous layout when you open the view debugger? If so, that may be causing the internal views to not receive the touch events.
You can provide UIStackView with either:
x and y constraints only
or
x, y, width and height.
In the above case the height constraint is missing.
If I use the code sample below in a playground everything looks good until I try to set the text property for one of the labels. I've pinned it down to being able to change the value before adding the stack view to the UIView. But if I change the label's text value after adding the stack view to the parent view then the two labels end up overlapping (see images at bottom).
This is a basic test harness highlighting the problem, the real code will set the value at run time, potentially after the view has loaded, and the actual control is more complex than this. I know it's something to do with auto-layout / constraints but I'm pretty sure I've followed the example code I was looking at properly but I can't see the difference between their example and mine.
import UIKit
import PlaygroundSupport
#IBDesignable
public final class TestHarness : UIView {
fileprivate let nameLabel: UILabel = {
let label = UILabel()
//label.font = UIFont.systemFont( ofSize: 20, weight: UIFont.Weight.medium)
label.textAlignment = .center
label.textColor = #colorLiteral(red: 0.6000000238, green: 0.6000000238, blue: 0.6000000238, alpha: 1)
label.text = "Person's Name"
label.adjustsFontSizeToFitWidth = true
label.translatesAutoresizingMaskIntoConstraints = false
return label
}()
fileprivate let jobTitleLabel: UILabel = {
let label = UILabel()
//label.font = UIFont.systemFont( ofSize: 20, weight: UIFont.Weight.medium)
label.textAlignment = .center
label.textColor = #colorLiteral(red: 0.6000000238, green: 0.6000000238, blue: 0.6000000238, alpha: 1)
label.text = "Job Title"
label.adjustsFontSizeToFitWidth = true
label.translatesAutoresizingMaskIntoConstraints = false
return label
}()
fileprivate lazy var stackView: UIStackView = {
let stackView = UIStackView()
stackView.axis = .vertical
//stackView.distribution = .fill
stackView.alignment = .center
stackView.translatesAutoresizingMaskIntoConstraints = false
stackView.addArrangedSubview(self.nameLabel)
stackView.addArrangedSubview(self.jobTitleLabel)
return stackView
}()
public required init?(coder: NSCoder) {
super.init(coder: coder)
initPhase2()
}
public override init(frame: CGRect) {
super.init(frame: frame)
initPhase2()
}
private func initPhase2() {
layer.cornerRadius = 10
layer.borderWidth = 2
self.backgroundColor = #colorLiteral(red: 1, green: 1, blue: 1, alpha: 1)
jobTitleLabel.backgroundColor = #colorLiteral(red: 0.9254902005, green: 0.2352941185, blue: 0.1019607857, alpha: 1)
// self.jobTitleLabel.text = "Developer" // <<-- Can set here no problem
self.addSubview(stackView)
// self.jobTitleLabel.text = "Developer" // << -- If I set this here, job title and name overlap
NSLayoutConstraint.activate([
{
let constraint = stackView.topAnchor.constraint(greaterThanOrEqualTo: layoutMarginsGuide.topAnchor, constant: 8)
constraint.priority = UILayoutPriority(750)
return constraint
}(),
stackView.leftAnchor.constraint(equalTo: layoutMarginsGuide.leftAnchor, constant: 8),
stackView.rightAnchor.constraint(equalTo: layoutMarginsGuide.rightAnchor, constant: -8),
{
let constraint = stackView.bottomAnchor.constraint(lessThanOrEqualTo: layoutMarginsGuide.bottomAnchor, constant: -8)
constraint.priority = UILayoutPriority(750)
return constraint
}(),
stackView.centerYAnchor.constraint(equalTo: layoutMarginsGuide.centerYAnchor)
])
}
#IBInspectable
public var Name: String? {
get{
return self.nameLabel.text
}
set{
self.nameLabel.text = newValue
}
}
#IBInspectable
public var JobTitle: String? {
get{
return self.jobTitleLabel.text
}
set{
self.jobTitleLabel.text = newValue
}
}
}
let dimensions = (width: 200, height: 300)
let control = TestHarness(frame: CGRect(x: dimensions.width / 2, y: dimensions.height / 2, width: dimensions.width, height: dimensions.height))
// control.JobTitle = "Developer" // << -- If I set this here, job title and name overlap
let view = UIView(frame: control.frame.insetBy(dx: -100, dy: -100))
view.backgroundColor = #colorLiteral(red: 0.8039215803, green: 0.8039215803, blue: 0.8039215803, alpha: 1)
view.addSubview(control)
PlaygroundPage.current.liveView = view
This is how it should look, and does look if I change the label's text before adding the stack view as a child of the parent view.
This is how it looks if I change the label's text after adding the stack view to the parent view. The job title overlaps with the name label.
Your code looks good, maybe there is a problem with Playground's render loop,
I created an Xcode project and used your code and it worked great in the simulator with no overlap:
import UIKit
override func viewDidLoad() {
super.viewDidLoad()
let dimensions = (width: 200, height: 300)
let control = TestHarness(frame: CGRect(x: dimensions.width / 2, y: dimensions.height / 2, width: dimensions.width, height: dimensions.height))
control.JobTitle = "Developer b2.0" // << -- No overlap in simulator
let contentView = UIView(frame: control.frame.insetBy(dx: -100, dy: -100))
contentView.backgroundColor = #colorLiteral(red: 0.3098039329, green: 0.01568627544, blue: 0.1294117719, alpha: 1)
contentView.addSubview(control)
view.addSubview(contentView)
}
I have a custom view subclass that I will provide all the code of for clarity. I have highlighted the relevant parts below.
Note: I know how to animate views using AutoLayout. The problem is not writing the animation code. The problem is that it updates the view but doesn't actually animate anything. It just jumps to the new size.
class ExpandingButtonView: UIView {
let titleLabel: UILabel = {
let l = UILabel()
l.translatesAutoresizingMaskIntoConstraints = false
l.textColor = .white
l.setContentCompressionResistancePriority(UILayoutPriorityRequired, for: .vertical)
l.setContentHuggingPriority(UILayoutPriorityRequired, for: .vertical)
return l
}()
let buttonStack: UIStackView = {
let s = UIStackView()
s.translatesAutoresizingMaskIntoConstraints = false
s.axis = .vertical
s.spacing = 8
s.isLayoutMarginsRelativeArrangement = true
s.layoutMargins = UIEdgeInsets(top: 10, left: 10, bottom: 10, right: 10)
return s
}()
var collapsed: Bool = true {
didSet {
animatedCollapsedState()
}
}
lazy var collapsedConstraint: NSLayoutConstraint = {
return self.bottomAnchor.constraint(equalTo: self.titleLabel.bottomAnchor, constant: 10)
}()
lazy var expandedConstraint: NSLayoutConstraint = {
return self.bottomAnchor.constraint(equalTo: self.buttonStack.bottomAnchor)
}()
init(title: String, color: UIColor, buttonTitles: [String]) {
super.init(frame: .zero)
translatesAutoresizingMaskIntoConstraints = false
layer.cornerRadius = 8
clipsToBounds = true
backgroundColor = color
let tapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(toggleCollapsed))
tapGestureRecognizer.numberOfTapsRequired = 1
tapGestureRecognizer.numberOfTouchesRequired = 1
addGestureRecognizer(tapGestureRecognizer)
titleLabel.text = title
addSubview(titleLabel)
addSubview(buttonStack)
buttonTitles.forEach {
let button = UIButton(type: .system)
button.translatesAutoresizingMaskIntoConstraints = false
button.backgroundColor = UIColor(white: 1.0, alpha: 0.5)
button.setTitle($0, for: .normal)
button.tintColor = .white
button.layer.cornerRadius = 4
button.clipsToBounds = true
button.titleLabel?.font = .boldSystemFont(ofSize: 17)
button.setContentCompressionResistancePriority(UILayoutPriorityRequired, for: .vertical)
buttonStack.addArrangedSubview(button)
}
NSLayoutConstraint.activate([
collapsedConstraint,
titleLabel.topAnchor.constraint(equalTo: topAnchor, constant: 10),
titleLabel.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 10),
titleLabel.trailingAnchor.constraint(equalTo: trailingAnchor, constant: 10),
titleLabel.bottomAnchor.constraint(equalTo: buttonStack.topAnchor),
buttonStack.leadingAnchor.constraint(equalTo: leadingAnchor),
buttonStack.trailingAnchor.constraint(equalTo: trailingAnchor),
])
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func toggleCollapsed() {
collapsed = !collapsed
}
func animatedCollapsedState() {
UIView.animate(withDuration: 1) {
self.collapsedConstraint.isActive = self.collapsed
self.expandedConstraint.isActive = !self.collapsed
self.layoutIfNeeded()
}
}
}
It has two states...
Collapsed...
Expanded...
When you tap it the tapGestureRecognizer toggles the collapsed value which triggers the didSet which then animates the UI.
The animating function is...
func animatedCollapsedState() {
UIView.animate(withDuration: 1) {
self.collapsedConstraint.isActive = self.collapsed
self.expandedConstraint.isActive = !self.collapsed
self.layoutIfNeeded()
}
}
However... it is not animating. It just jumps to the new size without actually animating.
I have removed another part of the view for the question. There is also a background image view that fades in/out during the UI change. That DOES animate. So I'm not quite sure what's going on here?
I have also tried moving the constraint updates out of the animation block and also tried running layoutIfNeeded() before updating them.
In all cases it does the same thing jumping to the new size.
You have to call layoutIfNeeded() on the view's superview.
func animatedCollapsedState() {
self.collapsedConstraint.isActive = self.collapsed
self.expandedConstraint.isActive = !self.collapsed
UIView.animate(withDuration: 1) {
self.superview?.layoutIfNeeded()
}
}