Khoa Pham
Khoa Pham

Ohayo

Swift Discovery

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My year in review 2020

Issue #715

I remember this time last year in December 2019, I spent almost every single bit of my free time on Puma because I want a Swift friendly version of fastlane that suits my need and leverages Swift 5 features.

Here’s my review of my …

How to read write files to iCloud Drive

Issue #937

First, you need to enable iCloud Documents capability. Go to target settings -> Signing & Capabilities -> iCloud ` Screenshot 2023-07-28 at 16 09 14

Then inside your Info.plist, add this with your iCloud identifier and app name …

How to make reusable Button component in React

Issue #936

From https://github.com/antonioerdeljac/next13-spotify

import { forwardRef } from "react";
import { twMerge } from "tailwind-merge";

export interface ButtonProps
  extends React.ButtonHTMLAttributes<HTMLButtonElement …

How to make fullstack web app

Issue #935

I prefer UI Component that works with Nextjs and Tailwind CSS

UI Libraries

How to use keychain in Swift

Issue #934

There are a few keychain wrappers around but for simple needs, you can write it yourself

Here is a basic implementation. I use actor to go with async/await, and a struct KeychainError to contain status code in case we want to deal with …

How to handle route case sensitivity in Nextjs

Issue #933

By default, Nextjs route is case sensitive, so localhost:3000/About and localhost:3000/about are different routes.

To make uppercase routes become lowercase routes, we can add a middleware.tsx file to the src so it is same level as pages …

How to make share and action extension in iOS

Issue #932

Add Share extension and Action extension respectively in Xcode. We can use the same code to both extension

Screenshot 2023-07-12 at 21 11 41

SwiftUI

I usually make a ShareView in SwiftUI with ShareViewModel to control the logic

struct ShareView: View {
    @ …

AppStore screenshots size checklist

Issue #931

AppStore screenshots

Screenshot specifications

iPhone 6.7"

Portrait 1290 x 2796

iPhone 6.5"

Portrait 1242 x 2688

In-App Purchase screenshots

In-app purchase information

iOS 640 x 920 tvO 1920 x1080 pixels macOS 1280 x 800 pixels

How to use AppIntents in iOS 16

Issue #930

AppIntents

Declare AppShortcutsProvider, note that appShortcuts uses @AppShortcutsBuilder syntax

import AppIntents

struct OurShortcutsProvider: AppShortcutsProvider {
    static var shortcutTileColor: ShortcutTileColor = .lightBlue …

How to press and hold button in SwiftUI

Issue #929

We can use ButtonStyleConfiguration to detect isPressed state

struct RecordButton: View {
    var body: some View {
        Button {
        
        } label: {
            Image(systemSymbol: .micFill)
        }
        .buttonStyle( …

How to copy text to the clipboard in Swift

Issue #928

For iOS, use string

Setting this property replaces all current items in the pasteboard with the new item. If the first item has no value of the indicated type, nil is returned.

let pasteboard = UIPasteboard.general
pasteboard.string = …

How to add launch screen in SwiftUI project

Issue #927

For a plain SwiftUI project, Xcode will generate a Info.plist file once you start to edit the Info tab in target settings.

There is a Launch screen (UILaunchScreen) key by default. It has a UILaunchScreen which we don’t need to so we …

How to create UserDefaults property wrapper in Swift

Issue #926

Like AppStorage, we can make a custom UserDefaults property wrapper that conforms to DynamicProperty

@propertyWrapper
public struct UserDefault<Value>: DynamicProperty {
    @State private var value: Value

    let key: String …

How to encrypt using CryptoKit in Swift

Issue #925

Use AES.GCM method with 128 bits key

import CryptoKit

public extension Optional {
    func tryUnwrap() throws -> Wrapped {
        if let value = self {
            return value
        } else {
            throw NSError(domain: …

How to use NavigationSplitView and NavigationStack in SwiftUI

Issue #924

Note

  • Navigation state needs to be in the container of NavigationSplitView for changes to propagate
  • Need to use WindowGroup for navigation bar to work

NavigationSplitView

the navigation split view coordinates with the List in its first …

How to style NavigationLink in macOS

Issue #923

NavigationLink on Mac applies the default button style. We can style it using ButtonStyle, here to use plain style we can just

NavigationLink(value: DetailRoute.books) {
    BooksView()
}
.buttonStyle(.plain)

SwiftUI EnvironmentValues

Issue #922

EnvironmentValues Views in SwiftUI can react to configuration information that they read from the environment using an Environment property wrapper

Updated for iOS 17

SwiftUI Environment values

How to make TextField Stepper in SwiftUI

Issue #921

Use HStack with TextField and a little extension

extension Binding where Value == Int {
    var toString: Binding<String> {
        Binding<String>(
            get: {
                "\(wrappedValue)"
            }, …

How to clear TextEditor background in SwiftUI

Issue #920

For iOS 16 and macOS 13.0

TextEditor(text: $text)
    .scrollContentBackground(.hidden)

For below, use [SwiftUI-Introspect](https://github.com/siteline/SwiftUI-Introspect)

TextEditor(text: $text)
    .instrospectTextView {
        $0. …

Learning Metal for SwiftUI

Issue #919

WWDC23 introduces lots of new additions to SwiftUI, notably Metal shader support with these modifiers

  • colorEffect: Returns a new view that applies shader to self as a filter effect on the color of each pixel.
  • layerEffect: Returns a new …

WWDC23 SwiftUI Q&A

Issue #918

Interesting SwiftUI Q&A during WWDC23

Observable vs ObservableObject

Q: With the new SwiftUI @Observable macro, are there any cases where ObservableObject would still be a better alternative?

A: Use ObservableObject when you need to …

Khoa Pham

Hello, I’m Khoa

I’m a thinker and storyteller with a passion for exploring the intersection of creativity and technology

🧑‍💻 I love crafting high quality and useful apps
🔥 I love open source. My GitHub open source has 2.3k followers with packages that are integrated by 45k+ apps and over 3.4m+ downloads on CocoaPods.
✍️ I write here on my blog and on Medium, which has over 2.7k+ followers with tons of articles and 90k+ monthly views.
🖥 Follow me for sharings about Swift, SwiftUI, iOS and macOS development.
Hei