Swift Discovery

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 …

Written by

Khoa Pham

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 …

Written by

Khoa Pham

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

SwiftUI

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

struct ShareView: View {
    @ …

Written by

Khoa Pham

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

Written by

Khoa Pham

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 …

Written by

Khoa Pham

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( …

Written by

Khoa Pham

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 = …

Written by

Khoa Pham

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 …

Written by

Khoa Pham

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 …

Written by

Khoa Pham

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: …

Written by

Khoa Pham

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 …

Written by

Khoa Pham

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)

Written by

Khoa Pham

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

Written by

Khoa Pham

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)"
            }, …

Written by

Khoa Pham

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. …

Written by

Khoa Pham

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 …

Written by

Khoa Pham

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 …

Written by

Khoa Pham

WWDC21 SwiftUI Q&A

Issue #917

Interesting SwiftUI Q&A during WWDC21

@StateObject or ObservedObject?

Q: Let’s say I have a purely SwiftUI flow. I have a ListView with a @StateObject var listFetcher, that makes requests for a list of items. Tapping on an item in the …

Written by

Khoa Pham

What's new in SwiftUI iOS 17 at WWDC23

Issue #916

WWDC23 brings new additions to SwiftUI

Scrolling

The scroll transition modifier is very similar to the visual effect modifier Curt used earlier for the welcome screen. It lets you apply effects to items in your scroll view.

I’m …

Written by

Khoa Pham

Recommended iOS articles to read

Issue #915

Here are my favorite iOS articles

• Why Your App Looks Better in Sketch
• Managing objects using Locks and Keys in Swift
• Proof in Functions
• When Not to Use an Enum

Written by

Khoa Pham