Hello everyone!
I am trying to implement push notifications in my WatchOS app. I have created the delegate class that handles the registration for remote notifications and that allows me to obtain the device token. Then I take the token and send it to Firebase, like this:
func didRegisterForRemoteNotifications(withDeviceToken deviceToken: Data) {
FirebaseApp.configure()
var ref: DatabaseReference!
ref = Database.database().reference().ref.child("/")
let tokenParts = deviceToken.map { data in String(format: "%02.2hhx", data) }
let token = tokenParts.joined()
if let userID = UserDefaults.standard.object(forKey: "id") as? String {
ref.child("users/\(userID)/token").setValue(token)
}
}
Then I am using a Python Script to communicate with APNS. I am using the http library to get access to HTTP2. This is what I have got:
payload = {
"aps" : {
"alert" : {
"title" : "Hello Push",
"message": "This is a notification!"
},
"category": "myCategory"
}
}
dev_server = "https://api.sandbox.push.apple.com:443"
device_token = "9fe2814b6586bbb683b1a3efabdbe1ddd7c6918f51a3b83e90fce038dc058550"
headers = {
'method': 'POST',
'path': '/3/device/{}'.format(device_token),
'autorization': 'bearer' + 'provider_token',
'apns-push-type': 'myCategory',
'apns-expiration': '0',
'apns-priority': '10',
}
async def test():
async with httpx.AsyncClient(http2=True) as client:
client = httpx.AsyncClient(http2=True)
r = await client.post(dev_server, headers=headers, data=payload)
print(r.text)
asyncio.run(test())
I have also downloaded the .p8 auth key file. But I don't really understand from the Apple Documentation what I have to do with it.
What is the provider token in the headers?
Am I doing the right thing with the token I receive from didRegisterForRemoteNotifications?
tmsm1999
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Hello everyone,
I trying to draw a custom view inside a for each (list style), that is inside a Scroll View, that is inside a Navigation view. Like this.
Navigation View {
ScrollView {
ForEach(array of objects ...) {
CustomView()
}
}
}
The custom view calls up a sheet that has a button that is able to delete elements inside the collection used in the foreach.
Unless I use this asyncAfter after dismissing the sheet I always get index out of bounds when I try to remove the last element of the array of objects in the for each:
DispatchQueue.main.asyncAfter(deadline: .now() + 0.5) {
workouts.removeAll(where: { $0.id == workoutToRemoveID })
}
I have been trying to solve this bug, but so far no luck. Could you give me a hand?
Thank you for your help!
Hello everybody,
I am new to Machine Learning but I want to get started with developing CoreML models to try them out in a few apps of my own.
What is the best way to build a dataset from Apple Watch data to build an activity model?
Do I build an iPhone app that works with the Apple Watch in order to get the data I need, or is there a more direct way to do it through Xcode, maybe?
Thank you for for help.
Best regards,
Tomás
Hello everybody,
I have very little experience developing applications for the Apple Watch. I want to use the Apple Watch to capture accelerometer and gyroscope data to create a CoreML model.
Could you give me some pointers on what I would have to do to be able to gather the data I need from the Apple Watch?
Do I need to create a simple Watch app to gather this data first and save it to a txt file, for exemple?
Thank you for your help.
Best regards,
Tomás
Hello everybody,
I am trying to run inference on a CoreML Model created by me using CreateML. I am following the sample code provided by Apple on the CoreML documentation page and every time I try to classify an image I get this error: "Could not create Espresso context".
Has this ever happened to anyone? How did you solve it?
Here is my code:
import Foundation
import Vision
import UIKit
import ImageIO
final class ButterflyClassification {
var classificationResult: Result?
lazy var classificationRequest: VNCoreMLRequest = {
do {
let model = try VNCoreMLModel(for: ButterfliesModel_1(configuration: MLModelConfiguration()).model)
return VNCoreMLRequest(model: model, completionHandler: { [weak self] request, error in
self?.processClassification(for: request, error: error)
})
}
catch {
fatalError("Failed to lead model.")
}
}()
func processClassification(for request: VNRequest, error: Error?) {
DispatchQueue.main.async {
guard let results = request.results else {
print("Unable to classify image.")
return
}
let classifications = results as! [VNClassificationObservation]
if classifications.isEmpty {
print("No classification was provided.")
return
}
else {
let firstClassification = classifications[0]
self.classificationResult = Result(speciesName: firstClassification.identifier, confidence: Double(firstClassification.confidence))
}
}
}
func classifyButterfly(image: UIImage) - Result? {
guard let ciImage = CIImage(image: image) else {
fatalError("Unable to create ciImage")
}
DispatchQueue.global(qos: .userInitiated).async {
let handler = VNImageRequestHandler(ciImage: ciImage, options: [:])
do {
try handler.perform([self.classificationRequest])
}
catch {
print("Failed to perform classification.\n\(error.localizedDescription)")
}
}
return classificationResult
}
}
Thank you for your help!
Hello everybody,
I am relatively new to ARKit and SceneKit and I have been experimenting with it.
I have been exploring plane detection and I want to keep only one plane in the view. If other planes are found I want the old ones to be removed.
This is the solution I found: I have an array with all found anchors and before adding a new child node I remove all the anchors from my scene.
What do you think of this solution? Do you think I should do it in any other way? Thank you!
private var planes = [UUID: Plane]()
private var anchors = [UUID: ARAnchor]()
func renderer(_ renderer: SCNSceneRenderer, didAdd node: SCNNode, for anchor: ARAnchor) {
// we only care about planes
guard let planeAnchor = anchor as? ARPlaneAnchor else {
return
}
print("Found plane: \(planeAnchor)")
for anchor in anchors {
sceneView?.session.remove(anchor: anchor.value)
}
let plane = Plane(anchor: planeAnchor)
planes[anchor.identifier] = plane
anchors[anchor.identifier] = anchor
node.addChildNode(plane)
}
Hello everyone,
I am new to Core Data and I am trying to implement it on my app. I am concerned with memory leaking and I want to make sure that I am doing things the proper and safer way
At the moment I have two views. Putting it simply, I have one where I create the object and the other where I just display the attributes.
I have a var - that is the type of my Entity in Core Data and I declare it like this:
@State var observation: Observation?
Then inside my view when I press the button I have:
let newObservation = Observation(entity: Observation.entity(), insertInto: managedObjectContext)
newObservation.id = UUID()
newObservation.speciesName = finalLabel
...
do {
		try managedObjectContext.save()
		observation = newObservation
} catch {
		activeAlert = .canNotSaveCoreData
	 showAlert.toggle()
}
I then send the observation object to my other view like this:
Details(sheetIsOpen: $sheetIsPresented, observation: observation!)
What intrigue me is the way I am sending the observation object. Is this correct / the standard way?
What should I be doing differently?
Thank you for your help!
Hello everybody,
Since I have been working on an app for quite some time now. This week I update to iOS 14.1 and updated Xcode to support this latest version.
Also, I have been doing some changes when it comes to user interface, the app flow and how I manage my core data entities.
I don't know if this two previous things are related in anyway but when I run the app on the device for the first time I get unexpected behaviour and the message:
[Memory] Resetting zone allocator with 68631 allocations still alive
If I continue using the app and let it stay on my iPhone it never happens again. I can launch it how many times I want and I don't get any crash or unexpected behaviour.
This is what intrigues me.
I tried locking for the issue in the Instruments app and I see a memory leak with the responsibility message "Allocated prior to attach." I can't figure out what this means.
Has anyone experienced anything similar?
Cheers,
Hello everybody,
I am trying to export a folder to the Files App using SwiftUI. I am using the fileExporter view modifier.
This is my code so far.
.fileExporter(isPresented: self.$presentExportCSV, document: FolderExport(url: createFolderURL()), contentType: .folder) { (res) in
}
struct FolderExport: FileDocument {
let url: String
static var readableContentTypes: [UTType] {[.folder]}
init(url: String) {
self.url = url
}
init(configuration: ReadConfiguration) throws {
url = ""
}
func fileWrapper(configuration: WriteConfiguration) throws -> FileWrapper {
let file = try! FileWrapper(url: URL(fileURLWithPath: url), options: .immediate)
return file
}
}
func createFolderURL() -> String {
var folder: String = ""
DispatchQueue.global(qos: .userInitiated).async {
let fileManager = FileManager.default
//Get apps document directory
let path = fileManager.urls(for: .documentDirectory, in: .userDomainMask)
//Create folder with obseravtion data
let folderName = "Observations Data"
let dataDirectory = path[0].appendingPathComponent("\(folderName)", isDirectory: true)
try? fileManager.createDirectory(at: dataDirectory.absoluteURL, withIntermediateDirectories: true, attributes: nil)
//Create folder with all images
let imagesFolder = "Observation Images"
let imagesDirectory = dataDirectory.appendingPathComponent("\(imagesFolder)", isDirectory: true)
try? fileManager.createDirectory(at: imagesDirectory.absoluteURL, withIntermediateDirectories: true, attributes: nil)
for observation in observationList {
let image = UIImage(data: observation.image!)
do {
let imageName = observation.id!.description
let imageURL = imagesDirectory.appendingPathComponent("\(imageName)" + ".jpeg")
try image?.jpegData(compressionQuality: 1.0)?.write(to: imageURL)
} catch {
print(error.localizedDescription)
}
}
let csvFileURL = dataDirectory.appendingPathComponent("Observation data.csv")
let csvFile = createCSVFile()
do {
try csvFile?.write(to: csvFileURL, atomically: true, encoding: .utf16)
} catch {
print(error.localizedDescription)
}
folder = dataDirectory.description
}
return folder
}
When the fileWrapper function is called in the FolderExport struct the app crashes.
I get this error: Error Domain=NSCocoaErrorDomain Code=263 "The item “System” couldn’t be opened because it is too large." UserInfo={NSFilePath=/, NSUnderlyingError=0x2834e2850 {Error Domain=NSPOSIXErrorDomain Code=27 "File too large"}}
I can't figure out what I am doing wrong.
I would really appreciate your help.
Hello everybody,
I am trying to parse a JSON file that has this structure:
{
"species":[
{
"name":"Aglais io",
"info": {
"family":"Nymphalidae",
"iNatLink":"https://www.inaturalist.org/observations?place_id=any&taxon_id=207977",
"WikipediaLink":"https://en.wikipedia.org/wiki/Aglais_io",
"otherName":"European Peacock Butterfly"
}
},
{
"name":"Aglais urticae",
"info": {
"family":"Nymphalidae",
"iNatLink":"https://www.inaturalist.org/observations?place_id=any&taxon_id=54468",
"WikipediaLink":"https://en.wikipedia.org/wiki/Small_tortoiseshell",
"otherName":"Small Tortoiseshell"
}
}
]
}
I am using a Codable struct to read the data.
Also, I am using this code to read the json file.
struct Species: Codable {
let name: String
struct info: Codable {
let family: String
let iNatLink: String
let WikipediaLink: String
let otherName: String
}
}
func loadSpeciesInfoJSOn() {
if let filePath = Bundle.main.url(forResource: "secondJSON", withExtension: "json") {
do {
let data = try Data(contentsOf: filePath)
let decoder = JSONDecoder()
let speciesList = try decoder.decode([Species].self, from: data)
print(speciesList)
} catch {
print("Can not load JSON file.")
}
}
}
I can not figure out what I am doing wrong.
Thank you for your help.
Hello everybody,
I am trying to create a custom annotation for a map view. Everything works perfectly, except for the UIImage I am trying to show that does not appear.
I think I am not being able to show the MKAnnotationView I am trying to set.
In the mapView method I am not being able to perform that print statement. I can't figure out why.
import SwiftUI
import UIKit
import MapKit
class ObservationAnnotation: NSObject, MKAnnotation {
let coordinate: CLLocationCoordinate2D
let title: String?
let subtitle: String?
var image: UIImage?
init(coordinate: CLLocationCoordinate2D, species: String, image: UIImage, confidence: Double) {
self.coordinate = coordinate
self.title = species
self.subtitle = "Confidence: \(confidence)"
self.image = image
}
}
class ObservationAnnotationView: MKAnnotationView {
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
}
override init(annotation: MKAnnotation?, reuseIdentifier: String?) {
super.init(annotation: annotation, reuseIdentifier: reuseIdentifier)
guard
let observationAnnotation = self.annotation as? ObservationAnnotation else {
return
}
image = observationAnnotation.image
}
}
struct MyObservationsMap: UIViewRepresentable {
var observationList: [Observation]
func makeUIView(context: Context) -> MKMapView {
MKMapView.init(frame: .zero)
}
func updateUIView(_ uiView: MKMapView, context: Context) {
for observation in observationList {
let annotation = ObservationAnnotation(
coordinate: CLLocationCoordinate2D(latitude: observation.latitude, longitude: observation.longitude),
species: observation.speciesName!,
image: UIImage(data: observation.image!)!,
confidence: observation.confidence
)
uiView.addAnnotation(annotation)
}
}
func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
let reuseId = "observation"
let annotationView = ObservationAnnotationView(annotation: annotation, reuseIdentifier: reuseId)
annotationView.canShowCallout = true
print("Here")
return annotationView
}
}
Thank you!
Hello everybody,
I am currently implementing the sharing capability of my application. I want to share an image in JPEG format with text.
The problem is that when I use image.jpegData(compressionQuality: 0.8) and I try to post it on Twitter the popup does not show up. This does not happens when converting to pngData. I find this odd and I don’t know if this has happened to any of you but I an error about dismissing the view.
Here is my UIActivityViewController:
import SwiftUI
struct ShareSheet: UIViewControllerRepresentable {
		
		var items: [Any]
		
		func makeUIViewController(context: UIViewControllerRepresentableContext<ShareSheet>) -> UIActivityViewController {
				
				let controller = UIActivityViewController(activityItems: items, applicationActivities: nil)
				return controller
		}
		
		func updateUIViewController(_ uiViewController: UIActivityViewController, context: UIViewControllerRepresentableContext<ShareSheet>) {}
}
I am creating my items array like this:
func getItemShareSheet() -> [Any] {
				
				let species = observation.speciesName
				let image = observation.image.pngData()
				let date = observation.date
				
				var finalText: String = ""
				
				if let location = observation.location {
						
						let latitude = String(format: "%.1f", Double(location.coordinate.latitude))
						let longitude = String(format: "%.1f", Double(location.coordinate.longitude))
						
						finalText = "New observation - \(date)\nSpecies: \(species)\nLatitude: \(latitude)\nLongitude: \(longitude)"
				}
				else {
						finalText = "New observation - \(date)\nSpecies: \(species)\n"
				}
				
				let items: [Any] = [image!, finalText]
				return items
		}
Has this happen to any of you?
Thank you!
Hello everybody,
For the last couple of days I have been struggling with preparing my app to limited access to the Photo Library. I want the user to be able to choose limited access.
In my app I need to be able to access the photo, as well as, photo metadata like - creation date and location (if available).
Before showing the picker, I am asking the user for authorisation to access the Photo Library, like this.
let accessLevel: PHAccessLevel = .readWrite
let status = PHPhotoLibrary.authorizationStatus(for: accessLevel)
switch status {
case .authorized:
self.imagePickerIsPresented.toggle()
case .limited:
print("Limited access - show picker.")
self.imagePickerIsPresented.toggle()
case .denied:
self.showPhotosAccessDeniedAlert.toggle()
case .notDetermined:
PHPhotoLibrary.requestAuthorization(for: accessLevel) { newStatus in
switch newStatus {
case .limited:
print("Limited access.")
break
case .authorized:
print("Full access.")
case .denied:
break
default:
break
}
}
default:
break
}
I have used breakpoints to debug this code, and this is working just fine.
When the user wants to import a photo to the application I am using a PHPicker. When the user calls the picker to select a photo, I am still able to see all the user photos, regardless of the previous selection made by the user.
However, I want to be able to see only the Photos the user selected. How can I handle this in the correct way?
Furthermore, regardless of the selection my picker is still able to access the photo as well as the metadata.
Here is the code for my PHPicker.
//
// ImagePicker.swift
// Lepidoptera
//
// Created by Tomás Mamede on 26/09/2020.
// Copyright © 2020 Tomás Santiago. All rights reserved.
//
import SwiftUI
import PhotosUI
@available(iOS 14, *)
struct ImagePicker: UIViewControllerRepresentable {
@Binding var imageToImport: UIImage
@Binding var isPresented: Bool
@Binding var imageWasImported: Bool
func makeUIViewController(context: UIViewControllerRepresentableContext<ImagePicker>) -> some UIViewController {
var configuration = PHPickerConfiguration(photoLibrary: PHPhotoLibrary.shared())
configuration.filter = .images
configuration.selectionLimit = 1
let imagePicker = PHPickerViewController(configuration: configuration)
imagePicker.delegate = context.coordinator
return imagePicker
}
func updateUIViewController(_ uiViewController: ImagePicker.UIViewControllerType, context: UIViewControllerRepresentableContext<ImagePicker>) {}
func makeCoordinator() -> ImagePicker.Coordinator {
return Coordinator(parent: self)
}
class Coordinator: NSObject, PHPickerViewControllerDelegate {
var parent: ImagePicker
init(parent: ImagePicker) {
self.parent = parent
}
func picker(_ picker: PHPickerViewController, didFinishPicking results: [PHPickerResult]) {
picker.dismiss(animated: true)
if results.count != 1 {
return
}
if let image = results.first {
if image.itemProvider.canLoadObject(ofClass: UIImage.self) {
image.itemProvider.loadObject(ofClass: UIImage.self) { image, error in
guard error == nil else {
print(error!)
return
}
if let image = image {
let identifiers = results.compactMap(\.assetIdentifier)
let fetchResult = PHAsset.fetchAssets(withLocalIdentifiers: identifiers, options: nil)
let imageMetadata = fetchResult[0]
print(imageMetadata.creationDate!)
print("Image impoted.")
self.parent.imageToImport = image as! UIImage
self.parent.imageWasImported.toggle()
}
}
}
}
self.parent.isPresented.toggle()
}
}
}
My fundamental problem is:
How can I respect the user selection by only showing the photos chosen by the user?
By doing this I am sure I only can access metadata for photos approved by the user.
Thank you for your help.
Hello everybody,
I have recently ran into a problem with my app the I am not being able to solve by myself.
I have implemented the new PHPicker. It is the best option to handle the new limited case where the app can only access photos approved by the user.
After having this completed I implemented the .requestAuthorization part of the application.
This is where my problem is.
At the moment, I have this code:
if #available(iOS 14, *) {
let accessLevel: PHAccessLevel = .readWrite
let status = PHPhotoLibrary.authorizationStatus(for: accessLevel)
switch status {
case .authorized:
self.imagePickerIsPresented.toggle()
case .limited:
print("Limited access - show picker.")
self.imagePickerIsPresented.toggle()
case .denied:
self.showPhotosAccessDeniedAlert.toggle()
case .notDetermined:
PHPhotoLibrary.requestAuthorization { newStatus in
switch newStatus {
case .authorized:
print("Full access.")
case .limited:
print("Limited access.")
break
case .denied:
break
default:
break
}
}
default:
break
}
}
First I check to see if the status is already determined. If it is not I call PHPhotoLibrary.requestAuthorization. Here things start to get really weird.
When I press "Select Photos" on my iPhone the picker to select the photos comes up and after I have selected the photos my code enters in the .authorized case and it prints "Full access".
However, after that when I try to open the picker it lands on the .limited case but the picker displays all the images in the camera roll and not only those I have selected.
Here is the code for my picker.
import SwiftUI
import PhotosUI
@available(iOS 14, *)
struct ImagePicker: UIViewControllerRepresentable {
@Binding var imageToImport: UIImage
@Binding var isPresented: Bool
@Binding var imageWasImported: Bool
func makeUIViewController(context: UIViewControllerRepresentableContext<ImagePicker>) -> some UIViewController {
var configuration = PHPickerConfiguration()
configuration.filter = .images
configuration.selectionLimit = 1
let imagePicker = PHPickerViewController(configuration: configuration)
imagePicker.delegate = context.coordinator
return imagePicker
}
func updateUIViewController(_ uiViewController: ImagePicker.UIViewControllerType, context: UIViewControllerRepresentableContext<ImagePicker>) {}
func makeCoordinator() -> ImagePicker.Coordinator {
return Coordinator(parent: self)
}
class Coordinator: NSObject, PHPickerViewControllerDelegate {
var parent: ImagePicker
init(parent: ImagePicker) {
self.parent = parent
}
func picker(_ picker: PHPickerViewController, didFinishPicking results: [PHPickerResult]) {
picker.dismiss(animated: true)
if results.count != 1 {
return
}
if let image = results.first {
print("Aqui")
if image.itemProvider.canLoadObject(ofClass: UIImage.self) {
image.itemProvider.loadObject(ofClass: UIImage.self) { image, error in
if let image = image {
print("Importou imagem")
self.parent.imageToImport = image as! UIImage
self.parent.imageWasImported.toggle()
}
}
}
}
self.parent.isPresented.toggle()
}
}
}
I am really struggling and all help is appreciated. Thanks a lot!
Hello,
In my application I am going to create a settings screen that will allow the user to change a couple of aspects in terms of how the core feature of the app works.
I have been wondering what might be the best way to save the user settings. I have considered global variables, binding variables and user defaults.
When it comes to global variables I don't think I have ever used them, with the exception of debugging. I kinda consider it a bad practice and I don't think all the screens of my app should have the ability to see and change this values.
Then, there is the possibility of using binding variables. I think this may be like trying to kill a fly with a war tank. I think it is too much and adds a lot of complexity to something that should be pretty straight-forward.
Finally, user defaults, to me, seems the best way to go. I can change it and keep persistency and it can be accessed easily.
What do you think is the best way to go?
Thank you for your help.