Khoa Pham
Khoa Pham

Ohayo

Swift Discovery

Discover all the tech

How to make segmented control in SwiftUI for macOS

Issue #629

Use Picker with SegmentedPickerStyle.

Picker(selection: $preferenceManager.preference.display, label: EmptyView()) {
    Image("grid")
        .resizable()
    .padding()
        .tag(0)
    Image("list")
        .resizable …

How to iterate over XCUIElementQuery in UITests

Issue #628

extension XCUIElementQuery: Sequence {
    public typealias Iterator = AnyIterator<XCUIElement>
    public func makeIterator() -> Iterator {
        var index = UInt(0)
        return AnyIterator {
            guard index < …

How to check if NSColor is light

Issue #627

Algorithm from https://www.w3.org/WAI/ER/WD-AERT/#color-contrast

extension NSColor {
    var isLight: Bool {
        guard
            let components = cgColor.components,
            components.count >= 3
        else { return false } …

How to trigger onAppear in SwiftUI for macOS

Issue #626

SwiftUI does not trigger onAppear and onDisappear like we expect. We can use NSView to trigger

import SwiftUI

struct AppearAware: NSViewRepresentable {
    var onAppear: () -> Void

    func makeNSView(context: …

How to force refresh in ForEach in SwiftUI for macOS

Issue #625

For some strange reasons, content inside ForEach does not update with changes in Core Data NSManagedObject. The workaround is to introduce salt, like UUID just to make state change

struct NoteRow: View {
    let note: Note
    let id: UUID …

How to access bookmark url in macOS

Issue #624

By default the approaches above grant you access while the app remains open. When you quit the app, any folder access you had is lost.

To gain persistent access to a folder even on subsequent launches, we’ll have to take advantage of a …

How to force FetchRequest update in SwiftUI

Issue #623

Listen to context changes notification and change SwiftUI View state

let changes = [NSDeletedObjectsKey: ids]
NSManagedObjectContext.mergeChanges(
    fromRemoteContextSave: changes,
    into: [context]
)
try context.save()

struct …

How to batch delete in Core Data

Issue #622

Read Implementing Batch Deletes

If the entities that are being deleted are not loaded into memory, there is no need to update your application after the NSBatchDeleteRequest has been executed. However, if you are deleting objects in the …

How to update FetchRequest with predicate in SwiftUI

Issue #621

Make subview that accepts FetchRequest. Trigger search by setting property

struct SideView: View {
    @Environment(\.managedObjectContext)
    var context

    @State var search: Search?

    var body: some View {
        VStack(alignment …

How to make TextField focus in SwiftUI for macOS

Issue #620

For NSWindow having levelother than .normal, need to override key and main property to allow TextField to be focusable

class FocusWindow: NSWindow {
    override var canBecomeKey: Bool  { true }
    override var canBecomeMain: Bool { …

How to manage work

Issue #619

Remote

Communication

Plan

How to show popover for item in ForEach in SwiftUI

Issue #618

Create custom Binding

List {
    ForEach(self.items) { (item: item) in
        ItemRowView(item: item)
            .popover(isPresented: self.makeIsPresented(item: item)) {
                ItemDetailView(item: item)
            }
    }
} …

How to make tooltip in SwiftUI for macOS

Issue #617

On macOS 11, we can use .help modifier to add tooltip

Button()
    .help("Click here to open settings")

If you support macOS 10.15, then create empty NSView and use as overlay. Need to updateNSView in case we toggle the state of …

How to make translucent SwiftUI List in macOS

Issue #615

List {
    ForEach(books) { (book: Book) in
        BookRow(book: book)
    }
}
.listStyle(SidebarListStyle())  

How to make tab view in SwiftUI

Issue #614

struct MyTabView: View {
    @EnvironmentObject
    var preferenceManager: PreferenceManager

    var body: some View {
        VOrH(isVertical: preferenceManager.preference.position.isVertical) {
            OneTabView(image: …

How to return VStack or HStack in SwiftUI

Issue #613

struct VOrH<Content>: View where Content: View {
    let isVertical: Bool
    let content: () -> Content

    init(isVertical: Bool, @ViewBuilder content: @escaping () -> Content) {
        self.isVertical = isVertical …

How to present NSWindow modally

Issue #612

Use runModal

This method runs a modal event loop for the specified window synchronously. It displays the specified window, makes it key, starts the run loop, and processes events for that window. (You do not need to show the window …

How to use Picker with enum in SwiftUI

Issue #611

enum WindowPosition: String, CaseIterable {
    case left
    case top
    case bottom
    case right
}
Picker(selection: $preference.position, label: Text("Position")) {
    ForEach(WindowPosition.allCases, id: \.self) { …

How to use visual effect view in NSWindow

Issue #610

Set NSVisualEffectView as contentView of NSWindow, and our main view as subview of it. Remember to set frame or autoresizing mask as non-direct content view does not get full size as the window

let mainView = MainView()
    .environment(\. …

How to animate NSWindow

Issue #609

Use animator proxy and animate parameter

var rect = window.frame
rect.frame.origin.x = 1000
NSAnimationContext.runAnimationGroup({ context in
    context.timingFunction = CAMediaTimingFunction(name: .easeIn)
    window.animator().setFrame( …

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