natanrolnik

//: Playground - noun: a place where people can play

import UIKit
import PlaygroundSupport

extension UIView {
    func addAndFitSubview(_ subview: UIView, insets: UIEdgeInsets = .zero) {
        addSubview(subview)
        subview.fitInSuperview(with: insets)
    }

natanrolnik

import UIKit

extension UICollectionViewFlowLayout {
    func equalizeSpacing(with minimumSpacing: CGFloat, aItemSize: CGSize? = nil, sectionInsetTop: CGFloat = 0, sectionInsetBottom: CGFloat = 0) {
        guard let collectionView = collectionView else { return }
        
        let totalWidth = collectionView.frame.width
        
        let itemSizeToUse = aItemSize ?? itemSize
        itemSize = itemSizeToUse

natanrolnik

<!--
Related: https://twitter.com/natanrolnik/status/1055756310023716865

The following snippet should be copied to:
~/Library/Developer/Xcode/UserData/CodeSnippets
as, for example, guardweak.codesnippet.

When you type `guardweakself` inside a function scope, it will generate the following code snippet:

guard let <#self#> = <#self#> else {

natanrolnik

import Foundation

let randomInt = Int.random(in: 0...3)

let spelledOut: String = {
    switch randomInt {
    case 0:
        return "Zero"
    case 1:
        return "One"

natanrolnik

import Foundation
import PlaygroundSupport

typealias DispatcherIdentifier = String

class Dispatcher {
    private var items = [DispatcherIdentifier: DispatchWorkItem]()

    private let queue: DispatchQueue

natanrolnik

PlaygroundPage.current.needsIndefiniteExecution = true

typealias DispatcherIdentifier = String

extension DispatchQueue {
    static var associatedValueKey = 0

    func schedule(after timeInterval: TimeInterval,
                  with identifier: DispatcherIdentifier,
                  action: @escaping () -> Void) {

natanrolnik

class NotificationThrottler {
    let notificationCenter: NotificationCenter
    let timeInterval: TimeInterval
    let handler: () -> Void
    private var workItem: DispatchWorkItem?

    deinit {
        notificationCenter.removeObserver(self)
    }

natanrolnik

//in your viewDidAppear method, schedule it:
DispatchQueue.main.asyncAfter(.now() + 3) { [weak self] in
  self?.micButton.jump()
}

natanrolnik

//keep a variable to know if the user tapped the button:
var micButtonTapped = false

func recordVoiceMessage() {
  //if the user tapped/held the mic button, set the variable to true
  micButtonTapped = true
}

//in your viewDidAppear method, schedule it:
DispatchQueue.main.asyncAfter(.now() + 3) { [weak self] in

natanrolnik

var micHintWorkItem: DispatchWorkItem?

func recordVoiceMessage() {
  micHintWorkItem?.cancel()
}

//in your viewDidAppear method, create and schedule the work item:
micHintWorkItem = DispatchWorkItem { [weak self] in
  self?.micButton.jump()
}