vinhnx

#!/usr/bin/env bash
# docs: https://docs.microsoft.com/en-us/appcenter/build/custom/scripts/

# Increment build version on Release
# format: %Y%m%d.%H%M
# reference: https://gist.github.com/sekati/3172554
if [ "${CONFIGURATION}" = "Release" ]; then
    echo "----"
    buildNumber=$(TZ="Asia/Ho_Chi_Minh" date +%Y%m%d.%H%M)
    echo "Build # set to: $buildNumber"

vinhnx

// https://kean.blog/post/swiftui-data-flow
struct SearchView: View {
    @ObservedObject var viewModel: SearchViewModel

    var body: some View {
        VStack {
            TextField("Search", text: $viewModel.query)
            List(viewModel.songs) {
                Text($0.name)
            }

vinhnx

class LocalConfigLoader: LocalConfigLoading {
  private var cachedConfigUrl: URL? {
    guard let documentsUrl = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first else {
      return nil
    }

    return documentsUrl.appendingPathComponent("config.json")
  }

  private var cachedConfig: AppConfig? {

vinhnx

//Orginal code from: https://gist.github.com/mecid/f8859ea4bdbd02cf5d440d58e936faec
//I just made some modification in appearnce, show monthly navigator and weekdays.

import SwiftUI

struct ContentView: View {
    
    @Environment(\.calendar) var calendar
    private var year: DateInterval {
        calendar.dateInterval(of: .month, for: Date())!

vinhnx

        let notificationCenter = NotificationCenter.default
        notificationCenter.addObserver(self, selector: #selector(adjustForKeyboard), name: UIResponder.keyboardWillHideNotification, object: nil)
        notificationCenter.addObserver(self, selector: #selector(adjustForKeyboard), name: UIResponder.keyboardWillChangeFrameNotification, object: nil)

    @objc func adjustForKeyboard(notification: Notification) {
        guard let keyboardValue = notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue else { return }

        let keyboardScreenEndFrame = keyboardValue.cgRectValue
        let keyboardViewEndFrame = view.convert(keyboardScreenEndFrame, from: view.window)

vinhnx

Diffable datasource and compositional layout:
 + https://www.donnywals.com/modern-table-views-with-diffable-data-sources/
 + https://www.swiftbysundell.com/articles/building-modern-collection-views-in-swift/

> **UICollectionViewDiffableDataSource** let us compute UICollectionView datasource and configuration, as a replacement for plain old UICollectionViewDatasource/UICollectionViewDelegate. We also have table view counter part, they are **UITableViewDiffableDataSource**.

> we can now use **UICollectionViewComposableLayout** as replacement for **UITableView**.

```swift
func makeCollectionView() -> UICollectionView {

vinhnx

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

vinhnx

# This file contains the fastlane.tools configuration
# You can find the documentation at https://docs.fastlane.tools
#
# For a list of all available actions, check out
#
#     https://docs.fastlane.tools/actions
#

# Uncomment the line if you want fastlane to automatically update itself
# update_fastlane

vinhnx

// mocking in swift
// reference: https://www.vadimbulavin.com/real-world-unit-testing-in-swift/

struct User {}

class AuthService {
    var client: HTTPClient

    // init
    init(_ client: HTTPClient) {

vinhnx

enum GitHubAPIError: Error {
    case userIsEmpty
    case invalidData
}

func fetchGithubUser(_ user: String) -> Single<[String: Any]> {
    guard user.isEmpty == false else { return Single.error(GitHubAPIError.userIsEmpty) }
    return Single<[String: Any]>.create(subscribe: { completion in
        let task = URLSession.shared
            .dataTask(with: URLRequest(url: URL(string: "https://api.github.com/users/\(user)")!), completionHandler: { data, _, error in