import Cocoa
class RedRotatedView: NSView {
override func viewDidMoveToSuperview() {
super.viewDidMoveToSuperview()
DispatchQueue.main.async {
self.applyRotation()
}
}
private func applyRotation() {
wantsLayer = true
layer?.backgroundColor = NSColor.red.cgColor
let radians = CGFloat(30 * Double.pi / 180.0)
self.layer?.transform = CATransform3DMakeRotation(radians, 0, 0, 1)
}
override func layout() {
super.layout()
}
}
class MainView: NSView {
let redView: RedRotatedView
override init(frame frameRect: NSRect) {
self.redView = RedRotatedView()
super.init(frame: frameRect)
setupRedView()
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
private func setupRedView() {
redView.wantsLayer = true
redView.layer?.backgroundColor = NSColor.red.cgColor
addSubview(redView)
redView.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
redView.centerXAnchor.constraint(equalTo: centerXAnchor),
redView.centerYAnchor.constraint(equalTo: centerYAnchor),
redView.widthAnchor.constraint(equalToConstant: 200),
redView.heightAnchor.constraint(equalToConstant: 200)
])
// redView.frame = NSRect(x:100,y:100,width: 200,height: 200)
}
}
@main
struct AppKitRotationTestApp {
static func main() {
let app = NSApplication.shared
let delegate = AppDelegate()
app.delegate = delegate
app.run()
}
}
class AppDelegate: NSObject, NSApplicationDelegate {
var window: NSWindow!
func applicationDidFinishLaunching(_ aNotification: Notification) {
let mainView = MainView(frame: NSRect(x: 0, y: 0, width: 800, height: 600))
window = NSWindow(
contentRect: NSRect(x: 0, y: 0, width: 800, height: 600),
styleMask: [.titled, .closable, .resizable, .miniaturizable],
backing: .buffered,
defer: false
)
window.center()
window.title = "AppKit Rotation Test"
window.contentView = mainView
window.makeKeyAndOrderFront(nil)
}
func applicationWillTerminate(_ aNotification: Notification) {
}
func applicationSupportsSecureRestorableState(_ app: NSApplication) -> Bool {
return true
}
}
If NSLayoutConstraint is not used directly and the NSView's frame is set directly, this situation does not occur. How can I avoid the transform being reset when using NSLayoutConstraint for layout?
