staltz

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

---

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

---

NicholasTD07

How to Download iOS Simulator (Xcode) in Command Line and Install it

For faster connection speed and more flexibility.

Steps

0. Start Xcode in command line by running this in commandline /Applications/Xcode.app/Contents/MacOS/Xcode
1. Start downloading of the simulator
2. Cancel it. YES CANCEL IT!
3. You will get a message like this:

staminajim

//    Copyright (c) 2019, SeatGeek, Inc
//    All rights reserved.
//
//    Redistribution and use in source and binary forms, with or without
//    modification, are permitted provided that the following conditions are met:
//
//    * Redistributions of source code must retain the above copyright notice, this
//    list of conditions and the following disclaimer.
//
//    * Redistributions in binary form must reproduce the above copyright notice,

dagronf

//
//  CAAnimation+BlockCallback.swift
//

import UIKit

//
// Modified from http://onedayitwillmake.com/blog/2016/06/caanimation-completion-callback-block/
// Updated for Swift 4 syntax
// All credit to the original author (Mario Gonzalez)

PaulWoodIII

//: [Previous](@previous)

import Foundation
import SwiftUI
import Combine

//: Current Value Subject is a value, a publisher and a subscriber all in one
let currentValueSubject = CurrentValueSubject<Bool, Never>(true)

print(currentValueSubject.value)

chriseidhof

import SwiftUI

struct ContentView: View {
    var body: some View {
        HStack {
            Text("Hello")
                .padding()
                .background(.blue)
                .overlay {
                    Color.yellow

steipete

extension Color {
    /// Return a random color
    static var random: Color {
        return Color(
            red: .random(in: 0...1),
            green: .random(in: 0...1),
            blue: .random(in: 0...1)
        )
    }
}

steipete

- In almost all cases where you type `@ObservedObject`, you really want `@StateObject`. 
If you need to support iOS 13, use `@State` on parent and pass value into child with `@ObservedObject` to simulate `@StateObject`.
Pass arguments to that model in `onAppear`. Example: https://github.com/ra1028/SwiftUI-Hooks/blob/main/Sources/Hooks/HookScope.swift#L39-L41

```
        .onAppear {
            model.onAppear(userTag: userTag)
        }
        .onDisappear {
            model.onDisappear()

IanKeen

import SwiftUI

extension View {
    public func discover<T: UIView>(
        where predicate: @escaping (T) -> Bool = { _ in true },
        _ closure: @escaping (T) -> Void
    ) -> some View {
        overlay(
            DiscoveryView(predicate: predicate, setup: closure)
                .frame(width: 0, height: 0)

avielg

#!/opt/homebrew/bin/python3

import re
import glob
import os
import graphviz

##################################################################################

######### USAGE #########