pudquick

brew is a bad neighbor

This isn't a guide about locking down homebrew so that it can't touch the rest of your system security-wise.

This guide doesn't fix the inherent security issues of a package management system that will literally yell at you if you try to do something about "huh, maybe it's not great my executables are writeable by my account without requiring authorization first".

But it absolutely is a guide about shoving it into its own little corner so that you can take it or leave it as you see fit, instead of just letting the project do what it likes like completely taking over permissions and ownership of a directory that might be in use by other software on your Mac and stomping all over their contents.

By following this guide you will:

• Never have to run sudo to forcefully change permissions of some directory to be owned by your account

jtrivedi

func scrollViewDidScroll(_ scrollView: UIScrollView) {
    for (i, view) in scrollView.subviews.enumerated() {
        var ty = 0.0
        if scrollView.contentOffset.y < 0 {
            // We're scrolling past the top of the scroll view.
            // Translate each item in the scroll view by some amount based on its index and scroll offset.
            ty = CGFloat(i) * abs(offsetY) / 8.0 * pow(1.12, CGFloat(i))
        }
        view.transform = CGAffineTransform(translationX: 0, y: ty)
    }

MapaX

#!/bin/zsh

makeXCFramework () {
BASEDIR=$(pwd)
echo "Script location: ${BASEDIR}"
LIBNAME=$(basename $BASEDIR)
echo "lib is: $LIBNAME"

cd Frameworks

fnky

ANSI Escape Sequences

Standard escape codes are prefixed with Escape:

• Ctrl-Key: ^[
• Octal: \033
• Unicode: \u001b
• Hexadecimal: \x1B
• Decimal: 27

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

htinlinn

extension JSONDecoder {

    func decode<T: Decodable>(_ type: T.Type, from data: Data, keyedBy key: String?) throws -> T {
        if let key = key {
            // Pass the top level key to the decoder.
            userInfo[.jsonDecoderRootKeyName] = key

            let root = try decode(DecodableRoot<T>.self, from: data)
            return root.value
        } else {

SheldonWangRJT

iOS Create a Carthage Supported Framework

#iOSBySheldon
A little bit Background of Carthage:
- Carthage works like Cocoapods, but a little bit simpler. 
	* When creating a Cocoapods supported framework need a .podspec file to do some config, which is not required by Carthage.
	* When using a Cocoapods supported framework, a workspace file will be automatically created, the umbrella header will be setup in a pod project inside workspace. It feels simple, but the whole process creates a lot files including a "giant" workspace.
	* When using a Carthage supported framework, it will just download the framework, and its dependencies if any, to a folder. All we need to do is to drag and drop it to the binary linking section in the project build setting tab, for the first time. It sounds complicated but it makes the project clean.
- Carthage is written in Swift. 
- Carthage internally uses `-xcodebuild` to build dependency.

lattner

Swift Concurrency Manifesto

Author: Chris Lattner

Chinese Translation by Jason Yu

Contents

• Introduction
• Overall Vision

vinhnx

Centered Paging with Preview Cells on UICollectionView

The proposed offset is where the collection view would stop without our intervention. We peek into this area by finding its centre as proposedContentOffsetCenterX and examine our currently visible cells to see which one’s centre is closer to the centre of that area.

import UIKit
 
class CenterCellCollectionViewFlowLayout: UICollectionViewFlowLayout {
    
    var mostRecentOffset : CGPoint = CGPoint()

Sorix

//  Created by Vasily Ulianov on 09.02.17, updated in 2019.
//  License: MIT

import Foundation

/// Subclass of `Operation` that adds support of asynchronous operations.
/// 1. Call `super.main()` when override `main` method.
/// 2. When operation is finished or cancelled set `state = .finished` or `finish()`
open class AsynchronousOperation: Operation {
    public override var isAsynchronous: Bool {