tclementdev

libdispatch efficiency tips

The libdispatch is one of the most misused API due to the way it was presented to us when it was introduced and for many years after that, and due to the confusing documentation and API. This page is a compilation of important things to know if you're going to use this library. Many references are available at the end of this document pointing to comments from Apple's very own libdispatch maintainer (Pierre Habouzit).

My take-aways are:

• You should create very few, long-lived, well-defined queues. These queues should be seen as execution contexts in your program (gui, background work, ...) that benefit from executing in parallel. An important thing to note is that if these queues are all active at once, you will get as many threads running. In most apps, you probably do not need to create more than 3 or 4 queues.

• Go serial first, and as you find performance bottle necks, measure why, and if concurrency helps, apply with care, always validating under system pressure. Reuse

khramtsoff

import Foundation

extension CustomStringConvertible {
    var description: String {
        var description: String = "\(type(of: self))("
        
        let selfMirror = Mirror(reflecting: self)
        
        for child in selfMirror.children {
            if let propertyName = child.label {

unnamedd

/**
 *  MacEditorTextView
 *  Copyright (c) Thiago Holanda 2020-2025
 *  https://bsky.app/profile/tholanda.com
 *
 *  (the twitter account is now deleted, please, do not try to reach me there)
 *  https://twitter.com/tholanda
 *
 *  MIT license

danielmartin

If you work on a Swift project that follows the Model-View-ViewModel (MVVM) architecture or similar, you may want to
jump to counterpart in Xcode from your view to your model, and then to your view model. (ie. by using Ctrl+Cmd+Up and Ctrl+Cmd+Down).

You can do this in recent versions of Xcode by setting a configuration default.

From a terminal, just type this command and press Enter:

#+BEGIN_SRC sh
defaults write com.apple.dt.Xcode IDEAdditionalCounterpartSuffixes -array-add "ViewModel" "View"
#+END_SRC

WorldDownTown

import Foundation

private extension CFStringTokenizer {
    var hiragana: String { string(to: kCFStringTransformLatinHiragana) }
    var katakana: String { string(to: kCFStringTransformLatinKatakana) }

    private func string(to transform: CFString) -> String {
        var output: String = ""
        while !CFStringTokenizerAdvanceToNextToken(self).isEmpty {
            output.append(letter(to: transform))

usagimaru

// Dump all NSApplication’s class methods
let dump = NSApplication.perform(NSSelectorFromString("fp_methodDescription")).takeUnretainedValue() as? String
// Dump all NSApplication’s instance methods
let dump = NSApp.perform(NSSelectorFromString("fp_methodDescription")).takeUnretainedValue() as? String

// or

print(NSApplication.value(forKey: "fp_methodDescription"))
print(NSApp.value(forKey: "fp_methodDescription"))