I have a CoreData model with two entities, 'User' and 'Player', that both use 'Person' as their 'Parent Entity'. While the App appears to work correctly in the simulator, including with CloudKit via NSPersistentCloudKitContainer, I get a crash in Xcode Previews:
libswiftCore.dylib [
AGScoringModel/Persistence.swift:183: Fatal error: #init(inMemory:): Failed to load persistent stores:Error Domain=NSCocoaErrorDomain Code=134110 "An error occurred during persistent store migration." UserInfo={sourceURL=file:///Users/ebg/Library/Developer/.../CoreDataStores/private/database.sqlite, reason=Cannot migrate store in-place: Cannot merge multiple root entity source tables into one destination entity root table, destinationURL=file:///Users/ebg/Library/Developer/.../CoreDataStores/private/database.sqlite, NSUnderlyingError=0x600000ce02a0 {Error Domain=NSCocoaErrorDomain Code=134110 "An error occurred during persistent store migration." UserInfo={message=Cannot merge multiple root entity source tables into one destination entity root table, destinationRootEntity=Person, NSUnderlyingException=Cannot merge multiple root entity source tables into one destination entity root table, sourceRootEntities=(
User,
Player
), reason=Cannot merge multiple root entity source tables into one destination entity root table}}}
]
Why is this? Something in my configuration for persistent container?
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Having MacBook Pro with macOS Monterey v 12.7.2 and Xcode 13.3 (13B113) I cannot find a Xcode simulator, which could provide iPhone 6.7" display for my first app's product page'
Any advice?
Thanks!
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I am using the Observable macro and when I use @Environment property wrapper to instance my model the preview stop working. Sample code below
my model Library
import SwiftUI
import Observation
@Observable class Library {
// ...
}
Now in my main app I created an instance of Library and add that instance to the environment
@main
struct BookReaderApp: App {
@State private var library = Library()
var body: some Scene {
WindowGroup {
LibraryView()
.environment(library)
}
}
}
Now if I want to retrieve the Library instance from any view using the @Environment property wrapper the preview stop working completely
struct LibraryView: View {
@Environment(Library.self) private var library
var body: some View {
List(library.books) { book in
BookView(book: book)
}
}
}
#Preview {
LibraryView()
}
Check the 2 screenshots below
Any idea why this is happening? Is there any workaround? I am working with Xcode Version 15.2. Thanks in advance for any kind of help!
Post not yet marked as solved
Have a fairly large project in production and after updating Xcode from 14.x to 15.x the previews are no longer working. Devs in our team are using various Apple silicon machines.
Error:
== PREVIEW UPDATE ERROR:
FailedToLaunchAppError: Failed to launch com.utr.utrplay
==================================
| RemoteHumanReadableError: The operation couldn’t be completed. Transaction failed. Process failed to launch. (process launch failed)
|
| BSTransactionError (1):
| ==error-description: Process failed to launch.
| ==NSLocalizedFailureReason: Transaction failed. Process failed to launch. (process launch failed)
| ==transaction: <FBApplicationProcessLaunchTransaction: 0x600003b240e0>
| ==precipitating-error: Error Domain=FBProcessExit Code=64 "The process failed to launch." UserInfo={NSLocalizedFailureReason=The process failed to launch., BSErrorCodeDescription=launch-failed, NSUnderlyingError=0x600000c2fb40 {Error Domain=RBSRequestErrorDomain Code=5 "Launch failed." UserInfo={NSLocalizedFailureReason=Launch failed., NSUnderlyingError=0x600000c2ea90 {Error Domain=NSPOSIXErrorDomain Code=111 "Unknown error: 111" UserInfo={NSLocalizedDescription=Launchd job spawn failed}}}}}
| ==error-reason: process launch failed
Post not yet marked as solved
https://developer.apple.com/forums/thread/731732
Possibly linked to the above issue
The app compiles just fine, but SwiftUI Previews cannot build if there any any packages that lack support for visionOS
I made sure that filters were enabled so that the package is only linked to iOS
In a project that literally NEVER imports or uses an iOS only package, it fails completely
== PREVIEW UPDATE ERROR:
SchemeBuildError: Failed to build the scheme ”VisionHelloWorld”
'tracks(withMediaType:)' is unavailable in visionOS
Compile LightCompressor.swift (arm64):
/Users/bryananderson/Library/Developer/Xcode/DerivedData/VisionHelloWorld-dviwzruidaouzeeafminiifghzfe/SourcePackages/checkouts/LightCompressor_iOS/Sources/LightCompressor/LightCompressor.swift:123:47: error: 'tracks(withMediaType:)' is unavailable in visionOS
guard let videoTrack = videoAsset.tracks(withMediaType: AVMediaType.video).first else {
^~~~~~
AVFoundation.AVAsset:17:15: note: 'tracks(withMediaType:)' has been explicitly marked unavailable here
open func tracks(withMediaType mediaType: AVMediaType) -> [AVAssetTrack]
Post not yet marked as solved
import FirebaseCore
import SwiftUI
@main
struct ToDoListApp: App {
init() {
FirebaseApp.configure()
}
var body: some Scene {
WindowGroup {
MainView()
}
}
}
Post not yet marked as solved
I've encountered while attempting to integrate SwiftUI into an existing UIKit project. Specifically, I have experienced recurring view crashes when creating new SwiftUI views within the project. My Feedback id is FB13509337
I would appreciate your assistance in resolving this matter promptly, as it is critical to the development of our application. Your prompt attention to this issue would be greatly appreciated
Post not yet marked as solved
I am having issues trying to use previews in the xcode 15.1.
I am using MacOS Sonoma and iOS 17.2 and am struggling using previews.
the preview never loads.it keeps on saying cannot preview in this file.
previews_diagnostics_summary.txt
Post not yet marked as solved
I have same code in Xcode and Playground. But Xcode is not previewing the View the right way. Here is a screenshot of Xcode:
and here is the screen of Playground:
when i run the code (command + R) it's working fine and i get the true preview in the app (just like what i get in Playground).
Am I doing something wrong or is it a bug?
Post not yet marked as solved
I'm using iXGuard for my Unity Project and need to build on XCode with iXGuard Toolchains (Xcode menu -> Toolchains -> select iXGuard Toolchains, and also need to add a new script for Post Action (Product -> Scheme -> Edit Scheme -> Archive -> Post-actions )
The question is how can I setup/add in Unity to configure for it instead of manual configure on Xcode?
Post not yet marked as solved
#Preview {
SwiftUIView()
}
Error:Missing argument for parameter 'isShowing' in call
Whay? can you help me?
Post not yet marked as solved
Hi,
I just learn swiftUI and trying to preview it on my device (iPhone 15 Pro Max), however the app is failed to launch on my device. I haven't change anything on the code yet.
Here's the error message from diagnostic
== PREVIEW UPDATE ERROR:
FailedToLaunchAppError: Failed to launch swplayground.MQ
==================================
| MessageError: Connection interrupted
|
| ==================================
|
| | MessageSendFailure: Message send failure for <ServiceMessage 28: relaunch>
Post not yet marked as solved
I work on my project on two computers. One of them is older and stuck at Xcode 13. My project targets iOS 15+.
Previously I was able to bounce back and forth between the two, checking code into source control in between.
After doing a bunch of work on one of them over an extended period, I've returned to my older one and checked out the code... only to be unable to build because Xcode balks at every use of #Preview. I didn't change any project settings in the meantime, so I have no idea why this is suddenly a problem...
Edit: It turns out that this is because previous versions of the SDK did not use this macro. Because I created a couple of new SwiftUI files on the newer OS and Xcode/SDK, it plopped #Preview into the new files instead of the previous implementation, PreviewProvider.
I'll leave this post up for anyone who searches on this problem, since I found zero other references in a general Web search.
I am getting Preview Crash. If I remove line 30 below. then the Preview Crash does not occur.
I have Restarted XCode,
I have done a Project Clean,
Then did a project rebuild.
I have also Created a new Project from scratch
Named the project Debug,
Add one new View File named MaskBootCamp
once I select MaskBootCamp
The Preview willl Crash with an Circle with a Red X in the center With Preview Crashed.
If I remove line 22 all is resolved and no exception occurs
Is this a Swift Bug or some error in the coding?
Excepition Report listed below the code. report Below:
** MaskBootCamp .swift **
import SwiftUI
struct MaskBootCamp: View {
@State var rating: Int = 0
var body: some View {
ZStack{
starsView
.overlay(overlayView.mask(starsView))
}
}
private var overlayView: some View {
GeometryReader { geometry in
ZStack(alignment: .leading) {
Rectangle()
.foregroundColor(.yellow)
.frame(width: CGFloat(rating) / 5 * geometry.size.width)
}
//allowsHitTesting(false)
}
}
private var starsView: some View {
HStack{
ForEach(1..<6) {index in
Image(systemName: "star.fill")
.font(.largeTitle)
.foregroundColor(.gray)
.onTapGesture {
rating = index
}
}
}
}
}
#Preview {
MaskBootCamp()
}
Post not yet marked as solved
The Xcode Canvas Simulator (for Xcode 14 and even 15 ..beta 6) cause multiple springboard and diagnosticd processes to run at nearly 100% CPU , cause the MacBook M1 to heat. This happens every time.
This is usually triggered after the Canvas show an error which live previewing the code as I edit it.
I have tried clearing the derived data but it doesn't seem to help. This happens with all projects. I am unable to use live previews because of this issue.
The are often other processes with the string Poster in them. Like PhotosPosterProvider , CollectionsPoster , ExtragalacticPoster running high on usage at the same time.
Post not yet marked as solved
Hi all,
when I am trying to build a preview I am always getting the error "Failed to launch app in reasonable time". When clicking on Diagnostics I get the following report information:
AppLaunchTimeoutError: Failed to launch app ”SwiftUI-Weather.app” in reasonable time
The app ”SwiftUI-Weather.app” did not launch on ”iPhone 15 Pro” in 15 seconds.
bundle identifier: tregnet.SwiftUI-Weather
device name: iPhone 15 Pro
path: /Users/MyUser/Library/Developer/Xcode/DerivedData/SwiftUI-Weather-fvxpuqojpxxuqtbuzmjvlatlmuqy/Build/Intermediates.noindex/Previews/SwiftUI-Weather/Products/Debug-iphonesimulator/SwiftUI-Weather.app
Also clicking on "Generate Report" in the Diagnostics menu is not doing anything for me, even after waiting for a few minutes.
Any help would be appreciated.
Greetings
Post not yet marked as solved
Hey guys, anybody knows how to fix issues with the keyboard on Xcode in preview mode? it used to work well for me but has now stopped working, see details.
Problem statement: Cannot use the keyboard in previews. For example, typing in a textfield does nothing. Everything works well in simulator.
Environment: macOS Monterey 12.6
Xcode 14.1
Thanks in advance for your input.
Post not yet marked as solved
Hello!
Being a beginner in creating and editing views using swiftUI, I am unsure of the current situation that I am presently in, and would be grateful for any advice or suggestions for the below problem.
For some context, I have recently begun exploring the "Capturing depth using the LiDAR camera" Documentation using AVFoundation and intend to change its ContentView file which is currently written in swiftUI.
The problem: I am unable to preview the SwiftUI code.
When I try to resume the Preview Pane on the right
Post not yet marked as solved
I'm working on a horizontally scrollable header view. I'd like to implement the following behavior: when users tap on the left/rightmost header items, the header would scroll so they become fully visible. I am using a custom PreferenceKey to report the selected index:
struct SelectedTabPreference: PreferenceKey {
static var defaultValue: Int = 0
static func reduce(value: inout Int, nextValue: () -> Int) {}
}
Then in my view, I wrap my content inside a ScrollViewReader to scroll to the selected header:
struct ContentView: View {
let tabs: [DrawerTab]
@State private var selectedIndex: Int = 0
var body: some View {
ScrollViewReader { scrollProxy in
ScrollView(.horizontal, showsIndicators: false) {
TopTabView(options: tabs, selectedIndex: $selectedIndex)
.padding(32)
.background(Color.clear.preference(key: SelectedTabPreference.self, value: selectedIndex))
}
.onPreferenceChange(SelectedTabPreference.self) { value in
let firstTabSelected = value == 0
let lastTabSelected = value == tabs.count - 1
guard firstTabSelected || lastTabSelected else { return }
withAnimation {
let anchor: UnitPoint = firstTabSelected ? UnitPoint(x: 0.1, y: 0) : UnitPoint(x: 0.9, y: 0)
scrollProxy.scrollTo(tabs[value], anchor: anchor)
}
}
}
}
}
This works well when I run the app, but the Xcode Preview only shows a white screen. In fact, if I include this view as a subview in other views, their previews also break. The Preview only returns to life if I remove the programmatic scrolling:
scrollProxy.scrollTo(tabs[value], anchor: anchor)
I'm pretty sure this has to do with the ScrollViewProxy as my other Preference-based layouts work with Previews, but I don't know how to resolve the issue. Xcode Previews are an integral part of my workflow, and I'd like to avoid losing them if there's a chance.
Post not yet marked as solved
I am unable to switch from iPhone 15(IOS 17 sim) to iPhone 14 pro(IOS 16.4 sim). I have both iOS 17 and iOS 16.4 simulators installed
p.s : Trying to switch to IOS 16.4 sim because 17 causes my M2 Air overheat alot to the extent that i can't touch it.
GoZoner.
