Below is some simple code that does nothing, saves nothing. Yet the memory usage keeps rising. Am I missing something or is this a bug? The code requires 6 core CPU minimum. ContentView.swift import SwiftUI import Combine struct ContentView: View { @EnvironmentObject var loopClass:LoopClass var body: some View { ProgressView(value: Float(loopClass.loop_count), total: Float(loopClass.max_loops) ).progressViewStyle(.circular).padding() Button("Run looper", action: { loopClass.loopFunc() } ) } } LoopClass.swift import Combine class LoopClass: ObservableObject { @Published var loop_count = 0 @Published var max_loops = 0 func loopFunc () { let loopSet = [ 1, 3, 5, 7, 11, 13 ] max_loops = Int(pow(Double(loopSet.count), 13.0)) print("max_loops = \(max_loops)") for loop13 in loopSet { DispatchQueue.global().async { for loop12 in loopSet { for loop11 in loopSet { for loop10 in loopSet { for loop9 in loopSet { for loop8 in loopSet { for loop17 in loopSet { for loop16 in loopSet { for loop5 in loopSet { for loop4 in loopSet { for loop3 in loopSet { for loop2 in loopSet { for loop1 in loopSet { DispatchQueue.main.async{ self.loop_count += 1 } } }}}}}}}}}}} } // DQ } // for loop13 } }

MAGMA API runs on NVIDIA or AMD GPU's via CUDA. Are there plans to code Accelerate for Metal? Thanks

Developing a program that needs maximum cores. My previous Intel Mac mini used all 6 cores, according to Activity Monitor. It showed 600% cpu usage. I assumed the M2 would use twelve, but only shows 400% cpu usage in Activity Monitor, ergo, two less! I don't recall setting a core usage parameter in Xcode. Any ideas? Ventura 13.3 and Xcode 14.3 up to date as of this post.

My iNet works fine but Numbers.app, Pages.app etc. not downloading.

I use as many cpu's as I can get with DispatchQueue. How do I test the Mac for cpu count in my code?

This is the second issue in my post "ProgressBar with DispatchQueue", delegation. I have used delegates with menu items but not program vars. In the previous post my ViewController has a progress bar but I would like the progress.DoubleValue var to be updated in a remote function, i.e., a function not declared within the ViewController class. (If I moved the function into the ViewController it would double in size.) How do I create and implement such a delegate? Please give example code. Thanks.

The model increments through a range of dates converted to Double and scaled, ranging from 0 to 1.0 I wish to show a determinate progress bar. As I understand it, the ProgressView() must be declared in the ContentView and its progress var must be declared as a @State var The ContentView declares the model vars as @EnvironmentObjects If I declare: @State private var = model.progressValue I get the error:"Cannot use instance member 'model' within property initializer; property initializers run before 'self' is available" btw the model class declares: @Published var progressValue : Double The model func (to increment through dates) is launched by a button in the ContentView. idk how to get the incremented progressValue from the model to the ContentView State var.

My app generates piecemeal near terabyte data distributed over one hundred files. Due to RAM and internal HD limitations I must store to an external HD in piecemeal fashion. That is to say, append fresh records directly to an existing file without reading-in the whole file, appending, and writing it out again. Ultimately (when data generation ceases) I will check each file to ensure uniqueness of member data structures. Is Core Data the tool I should use? If not, how do I append directly to disk-files without first reading it in?

I print a lot of SIMD3 vectors to the debugger area in Xcode. Some vector-elements have prefixed signs and some values are longer than others. I would like the printed vectors to align as they did in my old days of Fortran. The SIMD3 members are scalars which can't be cast as Double ( I know how to format output for Double) or even as NSNumber. Something akin to a NumberFormatter for vectors would be the objective, but I don't see how to do it. Scalars are wierd and (helpful) documentation sparse.

it may not deliver what you expect. For example: if you are using NASA/JPL/Standish equations of heliocentric planetary motion, it requires: "3. Modulus the mean anomaly (M) so that -180deg<=M<=+180deg and then obtain the eccentric anomaly, E, from the solution of Kepler's equation..." If you attempt to use the Swift "Modulo operator, %" you'll get the Xcode directive to use truncatingRemainder instead. Which IS better than % because of this note in "The Swift Programming Language (Swift 5.3)": "“NOTE The remainder operator (%) is also known as a modulo operator in other languages. However, its behavior in Swift for negative numbers means that, strictly speaking, it’s a remainder rather than a modulo operation.” Excerpt From The Swift Programming Language (Swift 5.3) Apple Inc. https://books.apple.com/us/book/the-swift-programming-language-swift-5-5/id881256329 This material may be protected by copyright. But you should try truncatingRemainder in your playground! Let: 0deg = 12 O'clock, 180/-180deg = 6 O'clock, -90deg = 9 O'clock and +90deg = 3 O'clock Now run this on your playground: let M = -181.25 var M180 = M while M180 > 180.0 { M180 -= 360.0 } while M180 < -180.0 { M180 += 360.0 } print("M = \(M)\t\tM180 = \(M180)\t\tM.truncatingRemainder(dividingBy: 180.0) = \(M.truncatingRemainder(dividingBy: 180.0))\t\tM.truncatingRemainder(dividingBy: 360.0) = \(M.truncatingRemainder(dividingBy: 360.0))") and you'll get this result: M = -181.25        M180 = 178.75 M.truncatingRemainder(dividingBy: 180.0) = -1.25 M.truncatingRemainder(dividingBy: 360.0) = -181.25 Thus, truncatingRemainder(dividingBy: 180.0) puts your planet 180deg away from where it should be, while M180 keeps the planets moving without quantum leaps.

took a bit of experimenting... import AVKit    //  macOS & iOS class ViewController_myShow: NSViewController {          @IBOutlet var myMOV: AVPlayerView! 10.          override func viewDidLoad() {         super.viewDidLoad()                  let playerView = AVPlayerView() 20. 21.         playerView.translatesAutoresizingMaskIntoConstraints = false 22. 23.         view.addSubview(playerView) 24. 25. 26. 27.         playerView.leadingAnchor.constraint  (equalTo: view.safeAreaLayoutGuide.leadingAnchor ).isActive = true 28. 29.         playerView.trailingAnchor.constraint (equalTo: view.safeAreaLayoutGuide.trailingAnchor).isActive = true 30. 31.         playerView.topAnchor.constraint      (equalTo: view.safeAreaLayoutGuide.topAnchor     ).isActive = true 32. 33.         playerView.bottomAnchor.constraint   (equalTo: view.safeAreaLayoutGuide.bottomAnchor  ).isActive = true 34. 35. 36. 37.         playerView.controlsStyle = .floating 38. 39.         playerView.showsFrameSteppingButtons   = true 40. 41.         playerView.showsFullScreenToggleButton = true 42. 43.          44. 45.         guard let path = Bundle.main.url(forResource: "myMovie", withExtension: "mov") else { return } 46. 47. 48. 49.         let player = AVPlayer(url: path) 50. 51.             playerView.player = player 52. 53.         playerView.player?.play()   54. 55.     } 56. 57. } The StoryBoard:AttributesInspector:AVPlayerView settings don't work for me... exactly. I had to set StoryBoard:AttributesInspector:AVPlayerView:ControlsStyle:none then include lines 37-41 in my code. The default is StoryBoard:AttributesInspector:AVPlayerView:ControlsStyle:inline which appears on screen but does nothing, i.e., no control. Line 21 is also required to be false. The .mov file can be File:AddFilesTo 'd or copied to Assets.xcassets see also: Developer Forum: "can't get extremely simple macOS video player to work..." https://developer.apple.com/documentation/avfoundation/media_playback_and_selection/creating_a_basic_video_player_macos &#9;&#9;&#9;

I have searched but cannot find an example of this. In my example I use playground to nest for-loops in a function called from within DispatchQueue. I find many roadblocks: //import AppKit // playground doesn't recognize AppKit?! import Dispatch import Foundation var comboCount:NSKeyValueObservation? //class viewContr: NSViewController { @IBOutlet weak var progressBar: NSProgressIndicator! // deinit { comboCount?.invalidate() } @IBAction func calcStuff() { DispatchQueue.global(qos: .userInitiated).async { let combos = possibleCombos() DispatchQueue.main.async { for word in combos { word.print0b8() } } } } //} func possibleCombos() -> [Int8] { var combos = [Int8]() for a in [0, 1] { for b in [0, 1] { for c in [0, 1] { for d in [0, 1] { combos.append(Int8(d | (c << 1) | (b << 2) | (a << 3)) ) comboCount = combos.count/16 as! NSKeyValueObservation // known total combos = 16 // How do I pass combos.count out to a progress bar? } } } } return combos } extension Int8 {func print0b8() {print("0b" + pad(string: String(self, radix: 2), toSize: 4))}} func pad(string : String, toSize: Int) -> String {var padded = string;for _ in 0..<(toSize - string.count) {padded = "0" + padded};return padded} Removing the @IB obstacles and the attempted declaration of a ViewController does produce output, but can't be used with a progress bar, e.g., import Dispatch import Foundation DispatchQueue.global(qos: .userInitiated).async { let combos = possibleCombos() DispatchQueue.main.async { for word in combos { word.print0b8() } } } func possibleCombos() -> [Int8] { var combos = [Int8]() for a in [0, 1] { for b in [0, 1] { for c in [0, 1] { for d in [0, 1] { combos.append(Int8(d | (c << 1) | (b << 2) | (a << 3)) ) // known total combos = 16 // How do I pass combos.count out to a progress bar? } } } } return combos } extension Int8 {func print0b8() {print("0b" + pad(string: String(self, radix: 2), toSize: 4))}} func pad(string : String, toSize: Int) -> String {var padded = string;for _ in 0..<(toSize - string.count) {padded = "0" + padded};return padded} In my actual App, i.e., not this playground, I have a ProgressBar in my storyboard and an IBoutlet declared in my view controller. I just can't find how to pass a value out of "possibleCombos()" and into the NSProgressIndicator. What I have read suggests a delegate but reading about delegates hasn't helped. I need an example. Thanks.

Code to draw a graph of data. Each abscissa has an ordinate range to be displayed as a line segment. All data, i.e., scaled points are verified to be within the declared analysisView.bounds. strokeColors are verified within the range 0..1 BTW, no I don't need animation for this static data, but CALayer seemed to require more coding, and I found fewer code examples for it. The code below has two problems: 1) it doesn't draw into the window the weird behavior of min/max The first is why I am posting. What am I missing? import AppKit class AnalysisViewController: NSViewController { @IBOutlet var analysisView: NSView! var ranges = [ClosedRange<Double>]() var ordinateMinimum = CGFloat() var ordinateMaximum = CGFloat() var ordinateScale = CGFloat() let abscissaMinimum:CGFloat = 1 let abscissaMaximum:CGFloat = 92 let abscissaScale :CGFloat = 800/92 let shapeLayer = CAShapeLayer() var points = [CGPoint]() // created just to verify (in debugger area) that points are within analysisView.bounds func genrateGraph() { // ranges.append(0...0) // inexplicably FAILS! @ ordinateMinimum/ordinateMaximum if replaces "if N == 1" below // ranges.append(0.1...0.1) // non-zero range does not fail but becomes the min or max, therefore, not useful for N in 1...92 { if let element = loadFromJSON(N) { if N == 1 { ranges.append( element.someFunction() ) } // ranges[0] is an unused placeholder // if N == 1 { ranges.append(0...0) } // inexplicably FAILS! @ ordinateMinimum/ordinateMaximum if replacing above line ranges.append( element.someFunction() ) } else { ranges.append(0...0) } // some elements have no range data } ordinateMinimum = CGFloat(ranges.min(by: {$0 != 0...0 && $1 != 0...0 && $0.lowerBound < $1.lowerBound})!.lowerBound) ordinateMaximum = CGFloat(ranges.max(by: {$0 != 0...0 && $1 != 0...0 && $0.upperBound < $1.upperBound})!.upperBound) ordinateScale = analysisView.frame.height/(ordinateMaximum - ordinateMinimum) for range in 1..<ranges.count { shapeLayer.addSublayer(CALayer()) // sublayer each abscissa range so that .strokeColor can be assigned to each // shapeLayer.frame = CGRect(x: 0, y: 0, width: analysisView.frame.width, height: analysisView.frame.height) // might be unneccessary let path = CGMutablePath() // a new path for every sublayer, i.e., range that is displayed as line segment points.append(CGPoint(x: CGFloat(range)*abscissaScale, y: CGFloat(ranges[range].lowerBound)*ordinateScale)) path.move(to: points.last! ) points.append(CGPoint(x: CGFloat(range)*abscissaScale, y: CGFloat(ranges[range].upperBound)*ordinateScale)) path.addLine(to: points.last! ) path.closeSubpath() shapeLayer.path = path // shapeLayer.strokeColor = CGColor.white let r:CGFloat = 1.0/CGFloat(range) let g:CGFloat = 0.3/CGFloat(range) let b:CGFloat = 0.7/CGFloat(range) // print("range: \(range)\tr: \(r)\tg: \(g)\tb: \(b)") // just to verify 0...1 values shapeLayer.strokeColor = CGColor(srgbRed: r, green: g, blue: b, alpha: 1.0) } } override func viewDidLoad() { super.viewDidLoad() view.wantsLayer = true // one of these (view or analysisView) must be unneccessary view.frame = CGRect(x: 0, y: 0, width: 840, height: 640) analysisView.wantsLayer = true analysisView.frame = CGRect(x: 0, y: 0, width: 840, height: 640) genrateGraph() } }

How do I access a returned value from a Process(), in this case 'which'... var sips_path : String? //MARK: locate sips on local machine let which_sips = Process() which_sips.executableURL = URL(fileURLWithPath: "which") which_sips.arguments = ["sips"] do { sips_path = try which_sips.run() } catch let error as NSError { sips_path = "/usr/bin/sips"; print("Failed to execute which_sips", error) }line 8. gets compiler error "Cannot assign value of type '()' to type 'String?'" I believe, but cannot prove, 'which' returns a string. .run() throws and throws are for errors only, right? So where is the result of calling which?It seems I should use a closure to use $0 but it's already in one...line 9. intends to assign a default path.

I have developed an app using SceneKit since Swift came out. Now SwiftUI is out and uses structs rather than classes. SceneKit is a cascade of classes. As a newbie, I am concerned that my code might be obsolete through depreciations soon after publication and I'd rather get ahead of the issues now. So, is SceneKit long-term viable? My first attempts at converting my custom classes to structs seems impossible without Apple leading the way. If I understand correctly, I can make a struct whose only member is an instance of a class, but the benefits of the struct, e.g., minimal memory, processing time, etc., are lost.