| import UIKit | |
| extension UIFont { | |
| public func withMonospacedNumbers() -> Self { | |
| let monospacedFeature: [UIFontDescriptor.FeatureKey: Any] | |
| if #available(iOS 15.0, *) { | |
| monospacedFeature = [ | |
| .type: kNumberSpacingType, | |
| .selector: kMonospacedNumbersSelector |
Use these steps to debug components of the Swift toolchain. This allows you to see Swift's source code from the debugger – instead of disassembly. The debugger can also provide some variable names and values. This has been initially tested with libswiftCore.dylib.
These instructions were updated as of Swift 5.2.1.
| @propertyWrapper | |
| public struct AnyProxy<EnclosingSelf, Value> { | |
| private let keyPath: ReferenceWritableKeyPath<EnclosingSelf, Value> | |
| public init(_ keyPath: ReferenceWritableKeyPath<EnclosingSelf, Value>) { | |
| self.keyPath = keyPath | |
| } | |
| @available(*, unavailable, message: "The wrapped value must be accessed from the enclosing instance property.") | |
| public var wrappedValue: Value { |
| /** | |
| * MacEditorTextView | |
| * Copyright (c) Thiago Holanda 2020-2021 | |
| * https://twitter.com/tholanda | |
| * | |
| * MIT license | |
| */ | |
| import Combine | |
| import SwiftUI |
| import UIKit | |
| class ViewController: UIViewController { | |
| enum Section { | |
| case main | |
| } | |
| struct Item: Hashable { | |
| let height: CGFloat |
| // | |
| // main.swift | |
| // RoutingApproaches | |
| // | |
| // Created by Chris Eidhof on 01.08.18. | |
| // Copyright © 2018 objc.io. All rights reserved. | |
| // | |
| import Foundation |
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
| As of iOS 11/macOS High Sierra, and only including ones in Foundation and CoreFoundation | |
| Strings: | |
| _NSCFString - a CFStringRef or CFMutableStringRef. This is the most common type of string object currently. | |
| - May have 8 bit (ASCII) or 16 bit (UTF-16) backing store | |
| _NSCFConstantString - a compile time constant CFStringRef, like you'd get with @"foo" | |
| - May also be generated by dynamic string creation if matches a string in a pre-baked table of common strings called the StringROM | |
| NSBigMutableString - an NSString backed by a CFStorage (https://github.com/opensource-apple/CF/blob/master/CFStorage.h) for faster handling of very large strings | |
| NSCheapMutableString - a very limited NSMutableString that allows for zero-copy initialization. Used in NSFileManager for temporarily wrapping stack buffers. |
| import Foundation | |
| // A lens is a getter and a setter combined | |
| struct Lens<Whole, Part> { | |
| let get: (Whole) -> Part | |
| let set: (inout Whole, Part) -> () | |
| } | |
| // We can create a lens from a key path | |
| extension Lens { |
This is a curated list of iOS (Swift & ObjC) frameworks which are inspired by React and Elm.
