macshome

import Foundation

// Playground for exploring memory layout in Swift.

// A simple struct
struct Foo {
    let a: Int?
    let b: Int?
    var isTrue = true
}

macshome

import Darwin

func getProcessList() {
    // Requesting the pid of 0 from systcl will return all pids
    var mib = [CTL_KERN, KERN_PROC, KERN_PROC_ALL, 0]
    var bufferSize = 0

    // To find the needed buffer size you call sysctl with a nil results pointer.
    // This sets the size of the buffer needed in the bufferSize pointer.
    if sysctl(&mib, UInt32(mib.count), nil, &bufferSize, nil, 0) < 0 {

oguzhanvarsak

Interview Questions for iOS Developers

1. Classes vs structs

In Swift, structs are value types whereas classes are reference types. When you copy a struct, you end up with two unique copies of the data. When you copy a class, you end up with two references to one instance of the data. It’s a crucial difference, and it affects your choice between classes or structs. (+ Class extendable, struct does not.)

2. What’s the difference between var and let? Which one would you choose for properties in a struct and why?

Both let and var are for creating variables in Swift. let helps you create immutable variables (constants) while on the other hand var creates mutable variables.

3. What does the mutating keyword mean?

The mutating keyword lets callers know that the method is going to make the value change.

gdavis

Xcode VIM

Learning VIM in Xcode comes with its own set of challenges and limitations, but there is enough there for you to give your mousing hand a break and master the keyboard.

A limited set of commands are available in Xcode, and this document attempts help ease the learning curve of using VIM in Xcode by providing a handy reference as well as what I find works for me in practice.

NOTE: Commands are case-sensitive. A command of N means pressing shift + n on the keyboard.

This document is a work in progress! Leave a comment if you would like to see a change.

nicklockwood

// This gist demonstrates how you can implement versioning for a Codable struct to support loading
// old serialized data after changing the structure. Notable features of this solution:
//
// * No need to make new properties optional, or to perform post-processing on the struct after
//   loading in ordeer to populate missing values
// * No need to change the call site - from the outside this struct behaves just the same
//   as if we had implemented codable directly in the normal way.
// * Versioning can be applied individually to parents or leaves in a larger tree of
//   structs without affecting the other elements
// * This approach will work even if the original struct was not designed with versioning in mind

beesandbombs

float[][] result;
float t, c;

float ease(float p) {
  p = c01(p);
  return 3*p*p - 2*p*p*p;
}

float ease(float p, float g) {
  p = c01(p);

CodeSlicing

//
//  BreatheAnimation.swift
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the "Software"), to deal
//  in the Software without restriction, including without limitation the rights
//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
//  of the Software, and to permit persons to whom the Software is furnished to do so,
//  subject to the following conditions:
//

Ellpeck

// Basically imports
// <> import something from a standard library location
// "" import something from an actual path
#include <stdio.h>
#include <stdlib.h>

// Preprocessor instructions with ifdef and ifndef, needs endif at the end
// ifndef = if not defined
#ifndef OOF
// Define a variable just to do the if check

zntfdr

// Original article here: https://fivestars.blog/swiftui/swiftui-share-layout-information.html

import SwiftUI

extension View {
  func readSize(onChange: @escaping (CGSize) -> Void) -> some View {
    background(
      GeometryReader { geometryProxy in
        Color.clear
          .preference(key: SizePreferenceKey.self, value: geometryProxy.size)

atereshkov

Xcode 13 duplicate line shortcut

1. Run

sudo chmod 666 /Applications/Xcode.app/Contents/Frameworks/IDEKit.framework/Versions/A/Resources//IDETextKeyBindingSet.plist

sudo chmod 777 /Applications/Xcode.app/Contents/Frameworks/IDEKit.framework/Versions/A/Resources/