shakemno

let emitterLayer = CAEmitterLayer()
        emitterLayer.frame = navigationView.bounds
        emitterLayer.renderMode = .additive
        emitterLayer.emitterMode = .outline
        emitterLayer.emitterShape = .line
        emitterLayer.emitterSize = CGSize(width: 50, height: 0)
        emitterLayer.emitterPosition = CGPoint(x: navigationView.bounds.width / 2, y: navigationView.bounds.height)
        emitterLayer.velocity = 1
        emitterLayer.seed = (arc4random() % 100) + 1
        navigationView.layer.insertSublayer(emitterLayer, at: 0)

shakemno

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.

---

shakemno

var backgroundColor: [UInt8] = [0, 0, 0, 0]

let GaussianBlurKernel: [Int16] =
[   1, 4, 6, 4, 1,
    4, 16, 24, 16, 4,
    6, 24, 36, 24, 6,
    4, 16, 24, 16, 4,
    1, 4, 6, 4, 1
]

shakemno

import Accelerate
import UIKit

public extension UIImage {
    public func applyLightEffect() -> UIImage? {
        return applyBlur(radius: 30, tintColor: UIColor(white: 1, alpha: 0.3))
    }
    
    public func applyExtraLightEffect() -> UIImage? {
        return applyBlur(radius: 20, tintColor: UIColor(white: 0.97, alpha: 0.82))

shakemno

// Assumes ARGB8888
CGImageRef CGImageCreateBlurredImage(CGImageRef inImage, NSUInteger blurRadius)
{
    if (!inImage) { return NULL; }

    uint32_t radius = (blurRadius % 2) ? (uint32_t)blurRadius : (uint32_t)++blurRadius;
    vImage_Error error;
    vImage_CGImageFormat imageFormat = {(uint32_t)CGImageGetBitsPerComponent(inImage), (uint32_t)CGImageGetBitsPerPixel(inImage), CGImageGetColorSpace(inImage), CGImageGetBitmapInfo(inImage), 0, NULL, kCGRenderingIntentDefault};
    
    vImage_Buffer source;

shakemno

#!/usr/bin/env bash

# This function lets you easily create series of commands into a single call
# It will print each successive command, run it and, as long as it returned
# with code 0, continue to the next step.
# If any step fails, it will stop and let you pick it back up after you fix the
# issues.
#
# Example of script using this function:
# !/usr/bin/env bash

shakemno

Swift Concurrency Manifesto

Author: Chris Lattner

Contents

• Introduction
• Overall Vision
• Part 1: Async/await: Beautiful asynchronous APIs
• Part 2: Actors: Eliminating shared mutable state

shakemno

import UIKit

struct UILabelDebugOptions: OptionSet {
    let rawValue: Int

    static let bounds    = UILabelDebugOptions(rawValue: 1 << 0)
    static let ascender  = UILabelDebugOptions(rawValue: 1 << 1)
    static let descender = UILabelDebugOptions(rawValue: 1 << 2)
    static let xHeight   = UILabelDebugOptions(rawValue: 1 << 3)
    static let capHeight = UILabelDebugOptions(rawValue: 1 << 4)

shakemno

import UIKit

struct UILabelDebugOptions: OptionSet {
    let rawValue: Int

    static let bounds    = UILabelDebugOptions(rawValue: 1 << 0)
    static let ascender  = UILabelDebugOptions(rawValue: 1 << 1)
    static let descender = UILabelDebugOptions(rawValue: 1 << 2)
    static let xHeight   = UILabelDebugOptions(rawValue: 1 << 3)
    static let capHeight = UILabelDebugOptions(rawValue: 1 << 4)

shakemno

// Multi to single thread execution
// Credits go to https://www.reddit.com/r/swift/comments/7ijbt0/whats_a_good_way_to_make_sync_calls_from_swift_to/dr4iwxr/

import Foundation
import PlaygroundSupport

PlaygroundPage.current.needsIndefiniteExecution = true
DispatchQueue.main.asyncAfter(deadline: .now() + .seconds(3000)) {
    print("Done")
    PlaygroundPage.current.finishExecution()