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After a while I returned to Xcode . I bought a new Mac mini M2 and I installed the Xcode 15.3.
To familiarize with the changes in the plataform I follow the tutorial you provide. I create a new iOS app following the instructions. I clicked in the ContentView and I was supposed to see in the canvas a representation of an iPhone running my app. Insteady I saw an error message "Cannot preview in this file - Unexpected error ocurred". I'm blocked in this situation . Do you have a solution for that? The code is provided by your tutorial. I didn't change it.
Thanks for your help in this matter.
Fernando
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Is there a system deep link URI to the built in files app? I would like to direct users to my apps location in the files app. For example files://myApp
The only exposed deep links for system I can find are the ones for mail, sms, FaceTime etc.
Thank you
(tag used for post was because I couldn’t find a deep link tag)
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Hello everyone, I looked at various methods how to Unit/UITest SwiftData but I couldn't find something simple. Is it even possible to test SwiftData? Does someone found a solution for that?
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Hello everyone
My goal is to create Apple's activity ring sparkle effect. So I found Paul Hudson's Vortex library. There is already a sparkle effect, but I don't know how to modify it to achieve my goal. Because I'm pretty new to SwiftUI animations. Does anyone have any idea how I could do this?
Vortex project: https://github.com/twostraws/Vortex
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The code for @State doesn't seem to work.
struct DonutListView: View {
var donutList: DonutList
@State private var donutToAdd: Donut?
var body: some View {
List(donutList.donuts) { DonutView(donut: $0) }
Button("Add Donut") { donutToAdd = Donut() }
.sheet(item: $donutToAdd) { // <-- would need a "donut in"
TextField("Name", text: $donutToAdd.name) // <-- donutToAdd is optional and I'm not sure how it would be unwrapped
Button("Save") {
donutList.donuts.append(donutToAdd)
donutToAdd = nil
}
Button("Cancel") { donutToAdd = nil }
}
}
}
Does anyone have a fix for this?
Thanks,
Dan!
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I have a situation where tapping on a NavigationLink on an item from a SwiftData Query results in an infinite loop, causing the app the freeze. If you run the code, make sure to add at least 1 item, then tap on it to see the issue.
Here is the code for a small sample app I made to illustrate the issue:
import SwiftUI
import SwiftData
@main
struct TestApp: App {
var sharedModelContainer: ModelContainer = {
let schema = Schema([
Item.self
])
let modelConfiguration = ModelConfiguration(schema: schema, isStoredInMemoryOnly: false)
do {
let container = try ModelContainer(for: schema, configurations: [modelConfiguration])
return container
} catch {
fatalError("Could not create ModelContainer: \(error)")
}
}()
var body: some Scene {
WindowGroup {
ContentView()
}
.modelContainer(sharedModelContainer)
}
}
struct ContentView: View {
var body: some View {
NavigationStack {
ListsView()
}
}
}
struct ListsView: View {
@Environment(\.modelContext) private var modelContext
@Query(filter: #Predicate<Item> { _ in true })
private var items: [Item]
var body: some View {
List(items) { item in
NavigationLink {
ItemDetail()
} label: {
VStack {
Text("\(item.name) | \(item.date.formatted())")
}
}
}
Button("Add") {
let newItem = Item(name: "Some item", date: .now)
modelContext.insert(newItem)
try? modelContext.save()
}
}
}
struct ItemDetail: View {
private var model = ItemModel()
var body: some View {
VStack {
Text("detail")
}
}
}
fileprivate var count = 0
class ItemModel {
var value: Int
init() {
value = 99
print("\(count)")
count += 1
}
}
@Model
final class Item {
let name: String
let date: Date
init(name: String, date: Date) {
self.name = name
self.date = date
}
}
In the test app above, the code in the initializer of ItemModel will run indefinitely. There are a few things that will fix this issue:
comment out the private var model = ItemModel() line in ItemDetail view
replace the @Query with a set list of Items
move the contents of the ListsView into the ContentView instead of referencing ListsView() inside the NavigationStack
But I'm not sure why this infinite loop is happening with the initializer of ItemModel. It seems like a SwiftData and/or SwiftUI bug, because I don't see a reason why this would happen. Any ideas? Has anyone run into something similar?
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Hi,
I have a List and I want to limit the dynamic text size for some of the elements in the list's row item view. I created a test view below. The ".dynamicTypeSize(.large)" restriction only works if it's applied to the List view, not if it's set for the the ContentItemView in the ForEach below.
Is there a reason for this? Do I need to do something else to limit a list row to a certain size? The example only has a text field, but I want to do this for a Image with some text inside it, and I wanted to restrict that text field, but it doesn't seem to work when the view is inside a List row.
Please let me know if there's a workaround for it.
import SwiftUI
import CoreData
struct ContentView: View {
@FetchRequest(
sortDescriptors: [NSSortDescriptor(keyPath: \Item.timestamp, ascending: true)],
animation: .default)
private var items: FetchedResults<Item>
@State private var multiSelectedContacts = Set<Item.ID>()
var body: some View {
NavigationStack {
List (selection: $multiSelectedContacts) {
ForEach(items) { item in
ContentItemView(item: item)
}
.dynamicTypeSize(.large) // <-- doesn't works
}
.dynamicTypeSize(.large) // <-- THIS WORKS
}
}
}
struct ContentItemView: View {
@Environment(\.managedObjectContext) private var viewContext
@ObservedObject var item: Item
@State var presentConfirmation = false
var body: some View {
HStack {
if let timestamp = item.timestamp, let itemNumber = item.itemNumber {
Text("\(itemNumber) - \(timestamp, formatter: itemFormatter)")
}
}
.popover(isPresented: $item.canShowPopover, content: {
Text("Test Item Label")
.frame(width: 100, height: 150)
})
}
}
private let itemFormatter: DateFormatter = {
let formatter = DateFormatter()
formatter.dateStyle = .short
formatter.timeStyle = .long
return formatter
}()
#Preview {
ContentView().environment(\.managedObjectContext, PersistenceController.preview.container.viewContext)
}
Hi team,
I'm running into the following issue, for which I don't seem to find a good solution.
I would like to be able to drag and drop items from a view into empty space to open a new window that displays detailed information about this item.
Now, I know something similar has been flagged already in this post (FB13545880: Support drag and drop to create a new window on visionOS)
HOWEVER, all this does, is launch the App again with the SAME WindowGroup and display ContentView in a different state (show a selected product e.g.).
What I would like to do, is instead launch ONLY the new WindowGroup, without a new instance of ContentView.
This is the closest I got so far. It opens the desired window, but in addition it also displays the ContentView WindowGroup
WindowGroup {
ContentView()
.onContinueUserActivity(Activity.openWindow, perform: handleOpenDetail)
}
WindowGroup(id: "Detail View", for: Reminder.ID.self) { $reminderId in
ReminderDetailView(reminderId: reminderId! )
}
.onDrag({
let userActivity = NSUserActivity(activityType: Activity.openWindow)
let localizedString = NSLocalizedString("DroppedReminterTitle", comment: "Activity title with reminder name")
userActivity.title = String(format: localizedString, reminder.title)
userActivity.targetContentIdentifier = "\(reminder.id)"
try? userActivity.setTypedPayload(reminder.id)
// When setting the identifier
let encoder = JSONEncoder()
if let jsonData = try? encoder.encode(reminder.persistentModelID),
let jsonString = String(data: jsonData, encoding: .utf8) {
userActivity.userInfo = ["id": jsonString]
}
return NSItemProvider(object: userActivity)
})
func handleOpenDetail(_ userActivity: NSUserActivity) {
guard let idString = userActivity.userInfo?["id"] as? String else {
print("Invalid or missing identifier in user activity")
return
}
if let jsonData = idString.data(using: .utf8) {
do {
let decoder = JSONDecoder()
let persistentID = try decoder.decode(PersistentIdentifier.self, from: jsonData)
openWindow(id: "Detail View", value: persistentID)
} catch {
print("Failed to decode PersistentIdentifier: \(error)")
}
} else {
print("Failed to convert string to data")
}
}
Is it possible to switch to a new View without using NavigationStack or NavigationLink or NavigationView?
I know I can do it with a Bool, which either shows the second view, or the first, and then toggles the Bool.
But can't I do something like this? Which obviously doesn't work.
struct BasicButton: View {
var buttonLabel = "Create User"
var body: some View {
Button {
CreateUser() //another SwiftUI view, not a function
} label: {
Text(buttonLabel)
}
}
}
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Is there a way to modify the SignInWithAppleButton so that only the Apple logo appears? According to Apple's guidelines, it's permissible to use only the icon. https://developer.apple.com/design/human-interface-guidelines/sign-in-with-apple
Unfortunately, the button isn't customizable. However, I need a button that utilizes the logic of onRequest and onCompletion.
Here's my current code using the standard SignInWithAppleButton.
SignInWithAppleButton(.signIn,
onRequest: { request in
print("Apple ID Request")
AppleSignInManager.shared.requestAppleAuthorization(request)
},
onCompletion: { result in
print("Apple ID Completion")
handleAppleID(result)
}
)
.font(.title)
.signInWithAppleButtonStyle(.white)
.frame(height: 50)
I tried exploring various SwiftUI customization options for the SignInWithAppleButton, such as adjusting its style or overlaying it with a custom image. I was expecting to find a way to remove the text and display only the Apple logo, as permitted by Apple's guidelines. However, I found that the SignInWithAppleButton isn't easily customizable in this way. So, I'm seeking guidance on alternative approaches to achieve the desired customization while still maintaining the functionality provided by the onRequest and onCompletion handlers.
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Hi everyone, I’m just starting with swift and Xcode and have a basic question. I have the following code I found online for an app that generates math addition questions.
I would like to run this Math app on my iPhone just before I open the apps I use most often (let’s say mail, WhatsApp, calendar and notes) ask me a maths question and if I answer correctly, carryon with the app originally intended to be opened.
I can do the opening of the Math app before the apps I use more often with shortcuts. I would like to modify the code bellow so that if I answer correctly it “closes” itself and returns to the originally intended app. With that intention I included the “exit(0)”, but I get an error.
Thanks for your help in advance!
Best,
Tom
struct ContentView: View {
@State private var correctAnswer = 0
@State private var choiceArray : [Int] = [0, 1, 2, 3]
@State private var firstNumber = 0
@State private var secondNumber = 0
@State private var difficulty = 1000
var body: some View {
VStack {
Text("(firstNumber) + (secondNumber)")
.font(.largeTitle)
.bold()
HStack {
ForEach(0..<2) {index in
Button {
answerIsCorrect(answer: choiceArray[index])
generateAnswers()
} label: {
AnswerButton(number: choiceArray[index])
}
}
}
HStack {
ForEach(2..<4) {index in
Button {
answerIsCorrect(answer: choiceArray[index])
generateAnswers()
} label: {
AnswerButton(number: choiceArray[index])
}
}
}
}
func answerIsCorrect(answer: Int){
if answer == correctAnswer {exit(0)}
}
}
func generateAnswers(){
firstNumber = Int.random(in: 0...(difficulty/2))
secondNumber = Int.random(in: 0...(difficulty/2))
var answerList = Int
correctAnswer = firstNumber + secondNumber
for _ in 0...2 {
answerList.append(Int.random(in: 0...difficulty))
}
answerList.append(correctAnswer)
choiceArray = answerList.shuffled()
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
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I have a data object that dynamically changes the UIImage assigned to one of its instance variables, but when showing this image in SwiftUI, it's always black and white. The following sample code shows the difference between the same image, but using first the native constructor Image(systemName:) and then Image(uiImage:).
When using AppKit and Image(nsImage:) this issue doesn't happen.
import SwiftUI
import UIKit
struct ContentView: View {
@State var object = MyObject()
var body: some View {
Image(systemName: "exclamationmark.triangle.fill")
.symbolRenderingMode(.palette)
.foregroundStyle(.white, .yellow)
Image(uiImage: object.image)
}
}
class MyObject {
var image = UIImage(systemName: "exclamationmark.triangle.fill")!
.applyingSymbolConfiguration(.init(paletteColors: [.white, .systemYellow]))!
}
#Preview {
ContentView()
}
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I'm trying to add a SpriteKit scene to my view using SpriteView(scene: spriteScene).
But it's doesn't work the .sks scene doesn't display
here is the image.
(and this is the code :)
import SwiftUI
import _SpriteKit_SwiftUI
struct Gameplay: View {
let spriteScene: MainGameScene
var body: some View {
ZStack {
-----------------------
SpriteView(scene: spriteScene)
----------------------------
}
}
}
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I am using @AppStorage in a model object (see code below that works as expected).
class ModelObject {
static let shared = ModelObject()
@AppStorage("enhanced") var scriptPickers: Bool = true
var defaultDependentValue: String {
scriptPickers ? "Enhanced" : "NOT enhanced"
}
}
struct ContentView: View {
@AppStorage("enhanced") var scriptPickers: Bool = true
var body: some View {
VStack {
Toggle(isOn: $scriptPickers, label: {
Text("userDefault val")
})
Text("value: \(ModelObject.shared.defaultDependentValue)")
}
}
}
Now I want to test my model object in a way that will allow me to use a mock instance of UserDefaults, but am having trouble with the syntax. I tried adding a userDefaults var, and referring to the var in the @AppStorage
class ModelObject {
static let shared = ModelObject()
let userDefaults: UserDefaults
init(userDefaults: UserDefaults = .standard) {
self.userDefaults = userDefaults
}
@AppStorage("enhanced", store: userDefaults) var scriptPickers: Bool = true
var defaultDependentValue: String {
scriptPickers ? "Enhanced" : "NOT enhanced"
}
}
However I can't find a way to avoid the syntax error this generates:
Cannot use instance member 'userDefaults' within property initializer; property initializers run before 'self' is available
Any guidance on how I might be able to:
continue using @AppStorage
be able to test my class in a way that doesn't force me to use UserDefaults.standard
thanks, in advance,
Mike
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I added a keyboard toolbar inside ZStack. And it works right after appears as expected
But after opening and closing another view over the .sheet modifier, The keyboard toolbar doesn't show anymore.
ZStack { . .. TextField() .toolbar { ToolbarItemGroup(placement: .keyboard) { .... } } } .sheet(isPresent: $binding) { Some other view }
Seems it happened after upgrading to iOS 16. Does anybody has the solution?
Thanks
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When I try to share a image of a component using the ImageRenderer, the type is not .png while sharing the image created using ShareLink
(The type is .jpeg for some reasons...)
My code looks like this:
ShareLink(
"Share",
item: (
ImageRenderer(
content: shareView.frame(
width: 420,
height: 520
)
).uiImage?.pngData()
)!,
preview: SharePreview(
"Share Preview",
image: (
ImageRenderer(
content: shareView.frame(
width: 420,
height: 520
)
).uiImage?.pngData()
)!
)
)
Also the image shared is always in low resolution, if anyone knows what to do in this case let me know!
Any helps will be appreciated!
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I have a Canvas inside a ScrollView on a Mac. The Canvas's size is determined by a model (for the example below, I am simply drawing a grid of circles of a given radius). Everything appears to works fine.
However, I am wondering if it is possible for the Canvas rendering code to know what portion of the Canvas is actually visible in the ScrollView?
For example, if the Canvas is large but the visible portion is small, I would like to avoid drawing content that is not visible.
Is this possible?
Example of Canvas in a ScrollView I am using for testing:
struct MyCanvas: View {
@ObservedObject var model: MyModel
var body: some View {
ScrollView([.horizontal, .vertical]) {
Canvas { context, size in
// Placeholder rendering code
for row in 0..<model.numOfRows {
for col in 0..<model.numOfColumns {
let left: CGFloat = CGFloat(col * model.radius * 2)
let top: CGFloat = CGFloat(row * model.radius * 2)
let size: CGFloat = CGFloat(model.radius * 2)
let rect = CGRect(x: left, y: top, width: size, height: size)
let path = Circle().path(in: rect)
context.fill(path, with: .color(.red))
}
}
}
.frame(width: CGFloat(model.numOfColumns * model.radius * 2),
height: CGFloat(model.numOfRows * model.radius * 2))
}
}
}
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how to get a clear background with navigationstack in visionOS app?
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I have a swiftui iPhone app running on the "iOS Apps on Mac" simulator. What I'm trying to do is get a notification when the window size changes, but nothing seems to work.
I have tried
.onReceive(NotificationCenter.default.publisher(for: UIContentSizeCategory.didChangeNotification)) { _ in
updateStuff()
}
I also tried
.onAppear() {
updateStuff()
}
but neither seems to get called
any suggestions ?
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I recently tried out the new .searchable modifier with SwiftUI to add searchable bars to my application, for security purpose I need to disable copy / paste option in that.
Is there any property we set to false to disable it?
araferna.
