NSWindow width not updated using setFrame(frame, display, animate) - swift

Question

I'm new to macos. I am developing an app for macos in which I want user to have side panels and he can hide/unhide as he desires.
I have used split view to split my screen into 3 parts. Right and left panels have proportional width to the view (not split view).
What I want is when the user hides the left panel, left pane should hide itself and the left anchor of window should move to right and the right anchor should stay at its position.
Similarly, if user hides right panel, the right panel should be hidden. Right anchor of window should move to left and left anchor should stay at its position.
the following function is called when the user wants to hide/unhide the left panel.
guard let window = self.view.window else {
return
}
var frame = window.frame
if window.isZoomed {
if leftPane.contentView!.isHidden {
self.leftPane.isHidden = false
self.leftPane.contentView?.isHidden = false
} else {
self.leftPane.contentView?.isHidden = true
}
} else {
if leftPaneHidden {
self.leftPane.isHidden = false
frame = NSRect(x: (frame.origin.x - leftPane.frame.size.width), y: frame.origin.y, width: (frame.size.width + leftPane.frame.size.width), height: frame.size.height)
leftPaneHidden = false
} else {
self.leftPane.isHidden = true
frame = NSRect(x: (frame.origin.x + leftPane.frame.size.width), y: frame.origin.y, width: (frame.size.width - leftPane.frame.size.width), height: frame.size.height)
leftPaneHidden = true
}
self.view.window?.setFrame(frame, display: true, animate: true)
I want left panel to be hidden as it works in notability app.

Answer 1

If you did mean that you want the window to shrink/expand, here's a working demo. If you want it to work the way Xcode works, then delete the messing around with the frame. It's implemented programmatically so I don't have to describe the storyboard, but you can easily do the same thing with storyboards. The only code in the left & right views sets the background color so you can see that it works.
SplitViewController:
class MainSplitViewController: NSSplitViewController {
weak var leftItem: NSSplitViewItem?
weak var rightItem: NSSplitViewItem?
convenience init(identifier: NSUserInterfaceItemIdentifier) {
self.init()
splitView.identifier = identifier
splitView.wantsLayer = true
splitView.layer?.backgroundColor = NSColor.darkGray.cgColor
splitView.dividerStyle = .thin
let vcL = SubViewController(NSView(), backgroundColor: .red)
let vcM = MainViewController(MainView(self), backgroundColor: .green)
let vcR = SubViewController(NSView(), backgroundColor: .blue)
vcL.view.widthAnchor.constraint(greaterThanOrEqualToConstant: 100).isActive = true
vcM.view.widthAnchor.constraint(greaterThanOrEqualToConstant: 100).isActive = true
vcR.view.widthAnchor.constraint(greaterThanOrEqualToConstant: 100).isActive = true
let sidebarItem = NSSplitViewItem(viewController: vcL)
sidebarItem.canCollapse = true
sidebarItem.holdingPriority = NSLayoutConstraint.Priority(NSLayoutConstraint.Priority.defaultLow.rawValue + 1)
addSplitViewItem(sidebarItem)
leftItem = sidebarItem
let mainItem = NSSplitViewItem(viewController: vcM)
addSplitViewItem(mainItem)
let inspItem = NSSplitViewItem(viewController: vcR)
inspItem.canCollapse = true
inspItem.holdingPriority = NSLayoutConstraint.Priority(NSLayoutConstraint.Priority.defaultLow.rawValue + 1)
addSplitViewItem(inspItem)
rightItem = inspItem
}
}
Middle view, with buttons to toggle the side views:
class MainView: NSView, DebugHelper {
weak var splitViewController: MainSplitViewController?
func labeledButton(_ stringValue: String = "") -> NSButton {
let button = NSButton()
button.translatesAutoresizingMaskIntoConstraints = false
button.heightAnchor.constraint(equalToConstant: 28.0)
button.bezelStyle = NSButton.BezelStyle.rounded
button.title = stringValue
return button
}
private func adjustWindowFrame(_ item: NSSplitViewItem, left: Bool) {
let view = item.viewController.view
let frame = window!.frame
if item.isCollapsed {
let minX = left ? frame.minX - view.frame.width : frame.minX
let newFrame = NSRect(x: minX, y: frame.minY, width: frame.width + view.frame.width, height: frame.height)
window!.setFrame(newFrame, display: true)
} else {
let minX = left ? frame.minX + view.frame.width : frame.minX
let newFrame = NSRect(x: minX, y: frame.minY, width: frame.width - view.frame.width, height: frame.height)
window!.setFrame(newFrame, display: true)
}
item.isCollapsed = !item.isCollapsed
}
#objc func collapseLeft(_ sender: Any) {
guard let item = splitViewController?.leftItem else { return }
adjustWindowFrame(item, left: true)
}
#objc func collapseRight(_ sender: Any) {
guard let item = splitViewController?.rightItem else { return }
adjustWindowFrame(item, left: false)
}
convenience init(_ parent: MainSplitViewController) {
self.init(frame: .zero)
splitViewController = parent
translatesAutoresizingMaskIntoConstraints = false
let lButton = labeledButton("Collapse Left")
addSubview(lButton)
lButton.bottomAnchor.constraint(equalTo: bottomAnchor, constant: -20).isActive = true
lButton.centerXAnchor.constraint(equalTo: centerXAnchor, constant: -100).isActive = true
lButton.action = #selector(collapseLeft)
lButton.target = self
let rButton = labeledButton("Collapse Right")
addSubview(rButton)
rButton.bottomAnchor.constraint(equalTo: bottomAnchor, constant: -20).isActive = true
rButton.centerXAnchor.constraint(equalTo: centerXAnchor, constant: 100).isActive = true
rButton.action = #selector(collapseRight)
rButton.target = self
}
}
class MainViewController: NSViewController {
convenience init(_ view: NSView, backgroundColor: NSColor = .white) {
self.init()
self.view = view
self.view.wantsLayer = true
self.view.layer?.backgroundColor = backgroundColor.cgColor
}
}