How to use background in iOS
Issue #631
beginBackgroundTask
When your app moves to the background, the system …
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How to show context popover from SwiftUI for macOS
Issue #630
For SwiftUI app using NSPopover, to show context popover menu, we can ask for windows array, get the _NSPopoverWindow and calculate the position. Note that origin of macOS screen is bottom left
(lldb) po NSApp.windows
▿ 2 elements
- 0 : …
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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 …
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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 < …
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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 } …
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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: …
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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 …
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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 …
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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 …
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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 …
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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 …
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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 { …
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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)
}
}
} …
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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 …
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How to make translucent SwiftUI List in macOS
Issue #615
List {
ForEach(books) { (book: Book) in
BookRow(book: book)
}
}
.listStyle(SidebarListStyle())
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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: …
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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 …
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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 …
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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) { …
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Hello, I’m Khoa
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