Looking for a solution for the following:
struct AttributedParagraph: View {
private let attributedText: NSMutableAttributedString
init (_ text: String) {
self.attributedText = text.attributed // tiny markdown parser
let paragraphStyle = NSMutableParagraphStyle()
...
attributedText.addAttribute(.paragraphStyle, ...)
attributedText.addAttribute(.font, ...)
}
var body: some View {
// Wrap it so padding for example works
Group {
AttributedText(attributedText: self.attributedText)
}
}
}
struct AttributedText: UIViewRepresentable {
var attributedText: NSMutableAttributedString
func makeUIView(context: Context) -> UILabel {
return UILabel()
}
func updateUIView(_ uiView: UILabel, context: UIViewRepresentableContext<AttributedText>) {
uiView.attributedText = self.attributedText
uiView.lineBreakMode = .byWordWrapping
uiView.numberOfLines = 0
uiView.sizeToFit()
}
}
How do I make AttributedParagraph to behave like Text in SwiftUI? At the moment the UILabel ignores all constraints passed from container and produces one long line. Ideally I'd like UILable to automatically break the lines whilst respecting the width provided by AttributedParagraph, and adjust its height to fit the content.
Related
I have a UITableViewCell containing a simple UIStackView and 2 UILabels (So it is from UIKit, NOT native SwiftUI) that should have a static width and dynamic height. How can I have a preview for this without need to see the actual phone size?
Note 1: .sizeThatFits will put all the weight on the width and there will be no multiline labels
Note 2: .device is showing extra useless empty spaces of the main view of the screen.
Note 3: .fixed(width:height:) is not prefered, because it will have less space or extra useless space as our needs.
Note 4: Need something like this: (For UIStackView)
DEMO
struct UILabelPorted: UIViewRepresentable {
var configuration = { (view: UILabel) in }
func makeUIView(context: UIViewRepresentableContext<Self>) -> UILabel {
let uiView = UIViewType()
uiView.setContentHuggingPriority(.defaultHigh, for: .vertical)
uiView.setContentHuggingPriority(.defaultHigh, for: .horizontal)
return uiView
}
func updateUIView(_ uiView: UILabel, context: UIViewRepresentableContext<Self>) { configuration(uiView) }
}
struct UILabel_Previews: PreviewProvider {
static var previews: some View {
UILabelPorted {
$0.text = "This label should have multiple lines like it is in a UITableView cell."
}
.previewLayout(.sizeThatFits)
}
}
It is not very clear where is the problem, but you need something like
ContentView()
.previewLayout(.fixed(width: 414, height: 300))
I have an NSPageController containing 8 or so NSViewControllers. I want to have a semi transparent bottom bar when the mouse is inside of the window, and a semi transparent top bar that persists no matter where the mouse is.
I add the top bar and bottom bar to the view, along with constraints in NSPageControllers viewDidLoad() method.
They show up fine on the first page, but when I start to transition from one page to another, the new NSViewController is redrawn over the overlaying views and they disappear. I can verify that they are under the NSViewControllers because then I drag all the way to a specific side I can see them underneath.
Any ideas why this is happening / how I can avoid it?
Code:
class MyPageController: NSPageController {
// MARK: - Properties
fileprivate var mouseIsInside = false
fileprivate var tabBar: TabBar!
// MARK: - NSViewController
override func viewDidLoad() {
super.viewDidLoad()
// add tab bar, then hide it (mouse in or outside of window will restore current state)
tabBar = TabBar(frame: NSRect(x: 0, y:0, width: view.frame.size.width, height: 40))
addTabBar(withAnimation: false)
removeTabBar(withAnimation: false)
NSLayoutConstraint.activate([
tabBar.heightAnchor.constraint(equalToConstant: 40),
tabBar.bottomAnchor.constraint(equalTo: view.bottomAnchor),
tabBar.centerXAnchor.constraint(equalTo: view.centerXAnchor),
tabBar.widthAnchor.constraint(equalTo: view.widthAnchor)
])
delegate = self
transitionStyle = .horizontalStrip
arrangedObjects = ["0","1","2","3","4","5","6","7"]
selectedIndex = 0
view.wantsLayer = true
// register for mouse events
let trackingArea = NSTrackingArea(rect: view.bounds, options: [.mouseEnteredAndExited, .mouseMoved, .activeAlways, .inVisibleRect], owner: self, userInfo: nil)
view.addTrackingArea(trackingArea)
}
}
// NSPageController Delegate
extension PageController: NSPageControllerDelegate {
func pageController(_ pageController: NSPageController, frameFor object: Any?) -> NSRect {
return NSInsetRect(view.frame, -1, 0)
}
func pageController(_ pageController: NSPageController, identifierFor object: Any) -> String {
return (object as? String)!
}
func pageController(_ pageController: NSPageController, viewControllerForIdentifier identifier: String) -> NSViewController {
return ViewController(id: identifier)
}
func pageControllerWillStartLiveTransition(_ pageController: NSPageController) {
Swift.print("pageControllerWillStartLiveTransition")
addTabBar(withAnimation: false)
}
func pageControllerDidEndLiveTransition(_ pageController: NSPageController) {
pageController.completeTransition()
addTabBar(withAnimation: false)
Swift.print("pageControllerWillEndLiveTransition")
}
}
// tabBar functions
extension PageController {
func addTabBar(withAnimation shouldAnimate: Bool) {
view.addSubview(tabBar)
tabBar.frame.size.width = view.frame.size.width
if mouseIsInside {
tabBar.showWithAnimation(shouldAnimate)
}
}
func removeTabBar(withAnimation shouldAnimate: Bool) {
tabBar.hideWithAnimation(shouldAnimate)
}
}
// Mouse Movements
extension PageController {
override func mouseEntered(with event: NSEvent) {
mouseIsInside = true
addTabBar(withAnimation: true)
}
override func mouseExited(with event: NSEvent) {
mouseIsInside = false
removeTabBar(withAnimation: true)
}
}
Thanks in advance!
This appear to be a not resolved bug. This fixed for me:
If the pageController is fullfilling the window's view, set to nil the contentView's background. This way the background we'll see is always the background of the pageController.
Sort views in this method:
func pageControllerDidEndLiveTransition(_ pageController: NSPageController) {
let controller = selectedViewController as! (YOUR_NSVIEWCONTROLLER_CLASS)
controller.view.superview?.addSubview(controller.view, positioned: .below, relativeTo: TOOLBAR)
}
Replace YOUR_NSVIEWCONTROLLER_CLASS for your ViewControllerclass name, and then replace TOOLBAR for the view that you want to see on top.
I know, my title is confusing, but my problem is confusing for me, too. :-(
In the class ReadMoreTextView I've a var of the type NSAttributedString that I can fill but when I read it, it is nil!?
Ok, I've to declare this and that with my terrible English ;-)
I want to use a IMHO very nice solution "ReadMoreTextView" of Ilya Puchka to "compress" a large UITextView:
I want to use an NSAttributedString, because I want to "highlight" the "Read more" with a red or blue color.
For that I use this init:
import UIKit
class ViewController: UIViewController {
#IBOutlet var textView: ReadMoreTextView!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
let text = "und ein neuer text Lorem ipsum dolor..."
let attributedString = NSAttributedString(string:text as String)
// 1) 2) 3)
textView = ReadMoreTextView(maximumNumberOfLines: 3, attributedTrimText: attributedString, shouldTrim: true)
...
}
There
are the Number of the leading lines in the "compressed" view,
is the NSAttributedString and
is a Flag, if the Text should be trimmed
And here is the class:
class ReadMoreTextView: UITextView {
override init(frame: CGRect, textContainer: NSTextContainer?) {
super.init(frame: frame, textContainer: textContainer)
scrollEnabled = false
editable = false
}
convenience init(maximumNumberOfLines: Int, attributedTrimText: NSAttributedString?, shouldTrim: Bool) {
self.init()
self.maximumNumberOfLines = maximumNumberOfLines // 1)
self.attributedTrimText = attributedTrimText // 2)
println(attributedTrimText) // of course displays the attributedTrimText
self.shouldTrim = shouldTrim // 3)
}
#IBInspectable
var maximumNumberOfLines: Int = 0 {
didSet { setNeedsLayout() }
}
var attributedTrimText: NSAttributedString? {
didSet { setNeedsLayout() }
}
#IBInspectable
var shouldTrim: Bool = false {
didSet { setNeedsLayout() }
}
Then I make a "po attributedTrimText" at a breakpoint at shouldTrim (last called), the result is nil?!
So because of the nil in attributedTrimText, the textView is empty when it will be displayed! :-(
I can't find the reason...
If you've set the class of the textView in the Storyboard to ReadMoreTextView, then the Storyboard instantiates the ReadMoreTextView class for you and assigns it to the textView IBOutlet.
On this line of code:
textView = ReadMoreTextView(maximumNumberOfLines: 3, attributedTrimText: attributedString, shouldTrim: true)
you are creating a new ReadMoreTextView and overwriting your outlet pointer textView pointing to this new ReadMoreTextView. Unfortunately, now you are not interacting with the ReadMoreTextView that is on screen.
You shouldn't overwrite an IBOutlet variable. You should just use it to read/write the properties of the IBOutlet variable.
textView.maximumNumberOfLines = 3
textView.attributedTrimText = attributedString
textView.shouldTrim = true
I have set the intercell spacing in my NSTableView to 0 by sending:
[self.tableView setIntercellSpacing:NSMakeSize(0, 0)];
in the window controller's awakeFromNib but there is still an (possibly 1 pixel wide) empty space between the rows, which I think is where the grid lines are drawn although I'm not using the grid lines. How can I get rid of this space between the rows?
update:
The NSTableView documentation seems to say that this 1 pixel separation should go away when the intercell separation is set to 0, 0. In my case, its not. Maybe it's a bug?
As suggested by trudyscousin, I'll post how I fixed my problem:
As it turns out, the empty space does in fact disappear when you set the intercell spacing to 0 as I did. My problem was that the drawing code in my NSTableCellView subclass wasn't drawing all the way to the edge of the view. The gap I was seeing wasn't the intercell separation, it was the border of my NSTableCellView subclass.
In my case the task was to have 0.5 pt (1 px on Retina display) separator. Seems even when intercellSpacing set to .zero (or 0.5 pt in my case) AppKit still preserving 1 pt space between rows when drawing selection.
I ended up by subclassing NSTableRowView. With custom row I can set separator to any height. Here is a Swift 4.2 example:
class WelcomeRecentDocumentsView: View {
private lazy var tableView = TableView().autolayoutView()
private lazy var scrollView = ScrollView(tableView: tableView).autolayoutView()
override var intrinsicContentSize: NSSize {
return CGSize(width: 240, height: 400)
}
private var recentDocumentsURLs = (0 ..< 10).map { $0 }
}
extension WelcomeRecentDocumentsView: NSTableViewDataSource {
func numberOfRows(in tableView: NSTableView) -> Int {
return recentDocumentsURLs.count
}
func tableView(_ tableView: NSTableView, viewFor tableColumn: NSTableColumn?, row: Int) -> NSView? {
return tableView.makeView(ItemView.self)
}
}
extension WelcomeRecentDocumentsView: NSTableViewDelegate {
func tableView(_ tableView: NSTableView, rowViewForRow row: Int) -> NSTableRowView? {
// Returning custom RowView.
return RowView(separatorHeight: separatorHeight, separatorColor: tableView.gridColor)
}
}
extension WelcomeRecentDocumentsView {
private var separatorHeight: CGFloat {
return convertFromBacking(1)
}
override func setupUI() {
addSubview(scrollView)
let column = NSTableColumn(identifier: "com.example.column", resizingMask: .autoresizingMask)
tableView.addTableColumn(column)
tableView.columnAutoresizingStyle = .uniformColumnAutoresizingStyle
tableView.headerView = nil
tableView.setAutomaticRowHeight(estimatedHeight: ItemView.defaultHeight)
tableView.intercellSpacing = CGSize(height: separatorHeight)
tableView.gridStyleMask = .solidHorizontalGridLineMask
}
override func setupHandlers() {
tableView.delegate = self
tableView.dataSource = self
}
override func setupLayout() {
LayoutConstraint.pin(to: .bounds, scrollView).activate()
}
override func setupDefaults() {
tableView.sizeLastColumnToFit()
}
}
extension WelcomeRecentDocumentsView {
class RowView: NSTableRowView {
let separatorHeight: CGFloat
let separatorColor: NSColor
init(separatorHeight: CGFloat = 1, separatorColor: NSColor = .gridColor) {
self.separatorHeight = separatorHeight
self.separatorColor = separatorColor
super.init(frame: .zero)
}
required init?(coder decoder: NSCoder) {
fatalError()
}
override func drawSelection(in dirtyRect: NSRect) {
let rect = bounds.insetBottom(by: -separatorHeight)
NSColor.alternateSelectedControlColor.setFill()
rect.fill()
}
override func drawSeparator(in dirtyRect: NSRect) {
let rect = bounds.insetTop(by: bounds.height - separatorHeight)
separatorColor.setFill()
rect.fill()
}
}
class ItemView: View {
static let defaultHeight: CGFloat = 52
override var intrinsicContentSize: NSSize {
return CGSize(intrinsicHeight: type(of: self).defaultHeight)
}
}
}
I read the document Synchronizing Scroll Views, and did exactly as the document, but there is an isssue.
I want to synchronize a NSTableView and a NSTextView. first let NSTableView monitor NSTextView, and everything is ok when I scroll the TextView, but when I try to scroll TableView, I found that the TableView will jump to another place(maybe backward several rows) at first, then continue to scroll from that place.
This issue still exists even after I let TextView monitor TableView.
anyone know what's the problem? can't I synchronize a TableView and a TextView?
Edited:
OK, now I found that the TableView will go back to the place since last scrolling. for example, TableView's top row is 10th row, then I scroll TextView, now TableView's top row is 20th row, and if I scroll TableView again, the TableView will go back to 10th row first, then start to scroll.
I just ran into this exact problem while troubleshooting a very similar situation (on Lion). I noticed that this only occurs when the scrollers are hidden -- but I verified that they still exist in the nib, and are still instantiated correctly.
I even made sure to call -[NSScrollView reflectScrolledClipView:], but it didn't make a difference. It really seems like this is a bug in NSScrollView.
Anyway, I was able to work around the issue by creating a custom scroller class. All I had to do was override the following class methods:
+ (BOOL)isCompatibleWithOverlayScrollers
{
// Let this scroller sit on top of the content view, rather than next to it.
return YES;
}
- (void)setHidden:(BOOL)flag
{
// Ugly hack: make sure we are always hidden.
[super setHidden:YES];
}
Then, I allowed the scrollers to be "visible" in Interface Builder. Since they hide themselves, however, they do no appear onscreen and they can't be clicked by the user. It's surprising that the IB setting and the hidden property are not equivalent, but it seems clear from the behavior that they are not.
This isn't the best solution, but it's the simplest workaround I've come up with (so far).
I had a quite similar problem.
I have 3 scrollviews to synchronize.
One that is a header that only scrolls horizontally.
One that is a side bar that only scrolls vertically.
One that is a content area below the header and to the right of the side bar.
The header and side bar should move with the content area.
The content area should move with the header or the side bar if either is scrolled.
Horizontal scrolling was never a problem.
Vertical scrolling was always causing the two views to scroll opposite directions.
The odd resolution I came to was to create a clipView subclass (which I already did, as you pretty much always need to if you want anything nice that doesn't come out of the box.)
In the clipView subclass, I add a property BOOL isInverted and in the override of isFlipped I return self.isInverted.
The weird thing is that these BOOL values for flippedness are set and match in all 3 views from the beginning.
It seems that scrolling machinery is indeed buggy.
My workaround that I stumbled upon was to sandwich the scroll synching code between calls to set both the side bar and content view unflipped and then update any vertical scrolling, then set both flipped again.
Must be some aging code in the scrolling machinery trying to support inverted scrolling...
These are the methods called by the NSNotificationCenter addObserver methods to observe the NSViewBoundsDidChangeNotification for the clipViews.
- (void)synchWithVerticalControlClipView:(NSNotification *)aNotification
{
NSPoint mouseInWindow = self.view.window.currentEvent.locationInWindow;
NSPoint converted = [self.verticalControl.enclosingScrollView convertPoint:mouseInWindow fromView:nil];
if (!NSPointInRect(converted, self.verticalControl.enclosingScrollView.bounds)) {
return;
}
[self.contentGridClipView setIsInverted:NO];
[self.verticalControlClipView setIsInverted:NO];
// ONLY update the contentGrid view.
NSLog(#"%#", NSStringFromSelector(_cmd));
NSPoint changedBoundsOrigin = self.verticalControlClipView.documentVisibleRect.origin;
NSPoint currentOffset = self.contentGridClipView.bounds.origin;
NSPoint newOffset = currentOffset;
newOffset.y = changedBoundsOrigin.y;
NSLog(#"\n changedBoundsOrigin=%#\n currentOffset=%#\n newOffset=%#", NSStringFromPoint(changedBoundsOrigin), NSStringFromPoint(currentOffset), NSStringFromPoint(newOffset));
[self.contentGridClipView scrollToPoint:newOffset];
[self.contentGridClipView.enclosingScrollView reflectScrolledClipView:self.contentGridClipView];
[self.contentGridClipView setIsInverted:YES];
[self.verticalControlClipView setIsInverted:YES];
}
- (void)synchWithContentGridClipView:(NSNotification *)aNotification
{
NSPoint mouseInWindow = self.view.window.currentEvent.locationInWindow;
NSPoint converted = [self.contentGridView.enclosingScrollView convertPoint:mouseInWindow fromView:nil];
if (!NSPointInRect(converted, self.contentGridView.enclosingScrollView.bounds)) {
return;
}
[self.contentGridClipView setIsInverted:NO];
[self.verticalControlClipView setIsInverted:NO];
// Update BOTH the control views.
NSLog(#"%#", NSStringFromSelector(_cmd));
NSPoint changedBoundsOrigin = self.contentGridClipView.documentVisibleRect.origin;
NSPoint currentHOffset = self.horizontalControlClipView.documentVisibleRect.origin;
NSPoint currentVOffset = self.verticalControlClipView.documentVisibleRect.origin;
NSPoint newHOffset, newVOffset;
newHOffset = currentHOffset;
newVOffset = currentVOffset;
newHOffset.x = changedBoundsOrigin.x;
newVOffset.y = changedBoundsOrigin.y;
[self.horizontalControlClipView scrollToPoint:newHOffset];
[self.verticalControlClipView scrollToPoint:newVOffset];
[self.horizontalControlClipView.enclosingScrollView reflectScrolledClipView:self.horizontalControlClipView];
[self.verticalControlClipView.enclosingScrollView reflectScrolledClipView:self.verticalControlClipView];
[self.contentGridClipView setIsInverted:YES];
[self.verticalControlClipView setIsInverted:YES];
}
This works 99% of the time, with only occasional jitter.
Horizontal scroll synch has no problems.
Swift 4 version which uses document view in auto-layout environment.
Based on Apple article Synchronizing Scroll Views with the difference that NSView.boundsDidChangeNotification temporary ignored on clip view when synchronising to other scroll view.
To hide vertical scroller reusable type InvisibleScroller is used.
File SynchronedScrollViewController.swift – View controllers with two scroll views.
class SynchronedScrollViewController: ViewController {
private lazy var leftView = TestView().autolayoutView()
private lazy var rightView = TestView().autolayoutView()
private lazy var leftScrollView = ScrollView(horizontallyScrolledDocumentView: leftView).autolayoutView()
private lazy var rightScrollView = ScrollView(horizontallyScrolledDocumentView: rightView).autolayoutView()
override func setupUI() {
view.addSubviews(leftScrollView, rightScrollView)
leftView.backgroundColor = .red
rightView.backgroundColor = .blue
contentView.backgroundColor = .green
leftScrollView.verticalScroller = InvisibleScroller()
leftView.setIntrinsicContentSize(CGSize(intrinsicHeight: 720)) // Some fake height
rightView.setIntrinsicContentSize(CGSize(intrinsicHeight: 720)) // Some fake height
}
override func setupHandlers() {
(leftScrollView.contentView as? ClipView)?.onBoundsDidChange = { [weak self] in
print("\(Date().timeIntervalSinceReferenceDate) : Left scroll view changed")
self?.syncScrollViews(origin: $0)
}
(rightScrollView.contentView as? ClipView)?.onBoundsDidChange = { [weak self] in
print("\(Date().timeIntervalSinceReferenceDate) : Right scroll view changed.")
self?.syncScrollViews(origin: $0)
}
}
override func setupLayout() {
LayoutConstraint.pin(to: .vertically, leftScrollView, rightScrollView).activate()
LayoutConstraint.withFormat("|[*(==40)]-[*]|", leftScrollView, rightScrollView).activate()
}
private func syncScrollViews(origin: NSClipView) {
// See also:
// https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/NSScrollViewGuide/Articles/SynchroScroll.html
let changedBoundsOrigin = origin.documentVisibleRect.origin
let targetScrollView = leftScrollView.contentView == origin ? rightScrollView : leftScrollView
let curOffset = targetScrollView.contentView.bounds.origin
var newOffset = curOffset
newOffset.y = changedBoundsOrigin.y
if curOffset != changedBoundsOrigin {
(targetScrollView.contentView as? ClipView)?.scroll(newOffset, shouldNotifyBoundsChange: false)
targetScrollView.reflectScrolledClipView(targetScrollView.contentView)
}
}
}
File: TestView.swift – Test view. Draws line every 20 points.
class TestView: View {
override init() {
super.init()
setIsFlipped(true)
}
override func setupLayout() {
needsDisplay = true
}
required init?(coder decoder: NSCoder) {
fatalError()
}
override func draw(_ dirtyRect: NSRect) {
super.draw(dirtyRect)
guard let context = NSGraphicsContext.current else {
return
}
context.saveGraphicsState()
let cgContext = context.cgContext
cgContext.setStrokeColor(NSColor.white.cgColor)
for x in stride(from: CGFloat(20), through: bounds.height, by: 20) {
cgContext.addLines(between: [CGPoint(x: 0, y: x), CGPoint(x: bounds.width, y: x)])
NSString(string: "\(Int(x))").draw(at: CGPoint(x: 0, y: x), withAttributes: nil)
}
cgContext.strokePath()
context.restoreGraphicsState()
}
}
File: NSScrollView.swift - Reusable extension.
extension NSScrollView {
public convenience init(documentView view: NSView) {
let frame = CGRect(dimension: 10) // Some dummy non zero value
self.init(frame: frame)
let clipView = ClipView(frame: frame)
clipView.documentView = view
clipView.autoresizingMask = [.height, .width]
contentView = clipView
view.frame = frame
view.translatesAutoresizingMaskIntoConstraints = true
view.autoresizingMask = [.width, .height]
}
public convenience init(horizontallyScrolledDocumentView view: NSView) {
self.init(documentView: view)
contentView.setIsFlipped(true)
view.translatesAutoresizingMaskIntoConstraints = false
LayoutConstraint.pin(in: contentView, to: .horizontally, view).activate()
view.topAnchor.constraint(equalTo: contentView.topAnchor).activate()
hasVerticalScroller = true // Without this scroll might not work properly. Seems Apple bug.
}
}
File: InvisibleScroller.swift - Reusable invisible scroller.
// Disabling scroll view indicators.
// See: https://stackoverflow.com/questions/9364953/hide-scrollers-while-leaving-scrolling-itself-enabled-in-nsscrollview
public class InvisibleScroller: Scroller {
public override class var isCompatibleWithOverlayScrollers: Bool {
return true
}
public override class func scrollerWidth(for controlSize: NSControl.ControlSize, scrollerStyle: NSScroller.Style) -> CGFloat {
return CGFloat.leastNormalMagnitude // Dimension of scroller is equal to `FLT_MIN`
}
public override func setupUI() {
// Below assignments not really needed, but why not.
scrollerStyle = .overlay
alphaValue = 0
}
}
File: ClipView.swift - Customized subclass of NSClipView.
open class ClipView: NSClipView {
public var onBoundsDidChange: ((NSClipView) -> Void)? {
didSet {
setupBoundsChangeObserver()
}
}
private var boundsChangeObserver: NotificationObserver?
private var mIsFlipped: Bool?
open override var isFlipped: Bool {
return mIsFlipped ?? super.isFlipped
}
// MARK: -
public func setIsFlipped(_ value: Bool?) {
mIsFlipped = value
}
open func scroll(_ point: NSPoint, shouldNotifyBoundsChange: Bool) {
if shouldNotifyBoundsChange {
scroll(to: point)
} else {
boundsChangeObserver?.isActive = false
scroll(to: point)
boundsChangeObserver?.isActive = true
}
}
// MARK: - Private
private func setupBoundsChangeObserver() {
postsBoundsChangedNotifications = onBoundsDidChange != nil
boundsChangeObserver = nil
if postsBoundsChangedNotifications {
boundsChangeObserver = NotificationObserver(name: NSView.boundsDidChangeNotification, object: self) { [weak self] _ in
guard let this = self else { return }
self?.onBoundsDidChange?(this)
}
}
}
}
File: NotificationObserver.swift – Reusable Notification observer.
public class NotificationObserver: NSObject {
public typealias Handler = ((Foundation.Notification) -> Void)
private var notificationObserver: NSObjectProtocol!
private let notificationObject: Any?
public var handler: Handler?
public var isActive: Bool = true
public private(set) var notificationName: NSNotification.Name
public init(name: NSNotification.Name, object: Any? = nil, queue: OperationQueue = .main, handler: Handler? = nil) {
notificationName = name
notificationObject = object
self.handler = handler
super.init()
notificationObserver = NotificationCenter.default.addObserver(forName: name, object: object, queue: queue) { [weak self] in
guard let this = self else { return }
if this.isActive {
self?.handler?($0)
}
}
}
deinit {
NotificationCenter.default.removeObserver(notificationObserver, name: notificationName, object: notificationObject)
}
}
Result: