The brand new animation in Stage Manager greatly reduced dizziness. However, don’t know why it ONLY applies when no window was presented. What would be the problem elsewhere?
Stage Manager is one of pretty few motion pictures that annoyed me and forced me to turn on Reduce Motion, or stop using Stage Manager. Big pity…
macOS 26.0 (25A5346a)
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Hi everyone,
I'm not an experienced developer. I'm interested in the low-latency related APIs in UIUpdateLink, but I failed to write even a minimal demo that works.
UIUpdateInfo.isImmediatePresentationExpected is always false here. My understanding must be wrong. I've totally no idea so I'm asking for help here. I appreciate anyone who gives suggestions of any kind.
Here's my (failed) demo about tracking touch inputs (of the 1st finger) and draw some shape at that place:
import UIKit
class ContentUIView: UIView {
// MARK: - About UIUpdateLink and drawing
required init?(coder: NSCoder) {
super.init(coder: coder)
initializeUpdateLink()
}
override init(frame: CGRect) {
super.init(frame: frame)
initializeUpdateLink()
}
private func initializeUpdateLink() {
self.updateLink = UIUpdateLink(view: self)
self.updateLink.addAction(to: .beforeCADisplayLinkDispatch,
target: self,
selector: #selector(update))
self.updateLink.wantsImmediatePresentation = true
self.updateLink.isEnabled = true
}
@objc func update(updateLink: UIUpdateLink,
updateInfo: UIUpdateInfo) {
print(updateInfo.isImmediatePresentationExpected) // FIXME: Why always false?
CATransaction.begin()
defer { CATransaction.commit() }
layer.setNeedsDisplay()
layer.displayIfNeeded()
}
override func draw(_ rect: CGRect) {
// FIXME: Any way to support opacity?
guard let context = UIGraphicsGetCurrentContext() else { return }
context.clear(rect)
guard let lastTouch = self.lastTouch else { return }
let location = lastTouch.location(in: self)
let circleBounds = CGRect(x: location.x - 16, y: location.y - 16, width: 32, height: 32)
context.setFillColor(.init(red: 1/2, green: 1/2, blue: 1/2, alpha: 1))
context.addLines(between: [])
context.fillEllipse(in: circleBounds)
}
// MARK: - Touch input
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
super.touchesBegan(touches, with: event)
guard lastTouch == nil else { return }
lastTouch = touches.first
}
override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
super.touchesEnded(touches, with: event)
guard let lastTouch, touches.contains(lastTouch) else { return }
self.lastTouch = nil
}
override func touchesCancelled(_ touches: Set<UITouch>, with event: UIEvent?) {
self.touchesEnded(touches, with: event)
}
private var lastTouch: UITouch?
private var updateLink: UIUpdateLink!
}
#Preview { ContentUIView() }
Anyway, I'm not meant to find alternative APIs and I'd be willing to know what it can't do.
I mean…I want to use defaults rather than launching apps via open with the saved environment variables.
This is pretty easy on iOS and other platforms. So what about in macOS?
Double-tap three fingers and drag to change zoom” should suppress “Three Finger to Drag”. Currently these gestures are triggered simultaneously, for no real reasons. I saw different behaviors for different environments, but none is desired.
Current and desired behavior:
This seems an issue so I filed a feedback.
Xcode 16.3 repeatedly logs a same message very frequently, as fast as a single thread can. I use Instruments and Console and find out the log is:
Needs flush!
by -[DNTBrotliDecoder decodeBytes:length:] in DNTDocumentationSupport.
The call is on a single non-main thread. I've tried to clear caches and it seems doesn't change. Yet I don't know exact point when the logging starts since launch.
Fortunately, this thread is dispatched at E cores, bringing approximately 2 watts of power load to my Mac.
Environments:
macOS 15.4 (24E248)
Xcode 16.3 (16E140)
M4 chip
Hi everyone,
Something didn't work in my environment so I wrote some demo code:
import SwiftUI
@main
struct DemoApp: App {
var body: some Scene {
WindowGroup {
Color.accentColor.opacity(1/4)
.frame(idealWidth: 800, idealHeight: 800)
}
.windowIdealSize(.fitToContent)
}
}
I expected a 800*800 window (then +28pt top) using .windowIdealSize(.fitToContent). Otherwise I can't control these views that use up available space such as Color, Spacer, GeometryReader, etc.
Was I missing something? Or this is a problem or intended framework design?
Environments:
macOS 15.4.1 (24E263) and 15.5 beta 4 (24F5068b)
Xcode 16.3 (16E140)