I have a complex project that includes a background process sending requests to the backend for updates. It sends requests once per second.
So, I have the MyView where the PresetPicker is located. When I open the PresetPicker and try to scroll down, it keeps pushing me back up every second. PresetPicker redraws itself every second due to some changes from the background process. (Turning off the background process confirmed that everything works fine.)
I wrapped my PresetPicker in EquatableView, added a bunch of logs triggered by changes/redraws of the PresetPicker, but the logs are empty and EquatableView didn't help.
I tried setting breakpoints; they trigger when the PresetPicker first appears but don't trigger afterward. How can I fix/debug this?
Here is some code:
struct PresetPicker: View, Equatable {
var body: some View {
Menu {
Text("1")
Text("2")
Text("3")
Text("4")
} label: {
Text("menu")
}
}
}
struct MyView: View {
var body: some View {
EquatableView(content:
PresetPicker()
)
}
}
Jonatus
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I have read through many forums but haven't found a solution for myself. When sending a notification, my NotificationService is not being called. I added it exactly as described in the official Apple tutorial and tried adding it again following other tutorials. Nothing helped. I haven't made any changes to it; it is in the same form as it is automatically created. Here it is:
import UserNotifications
class NotificationService: UNNotificationServiceExtension {
var contentHandler: ((UNNotificationContent) -> Void)?
var bestAttemptContent: UNMutableNotificationContent?
override func didReceive(_ request: UNNotificationRequest, withContentHandler contentHandler: @escaping (UNNotificationContent) -> Void) {
self.contentHandler = contentHandler
bestAttemptContent = (request.content.mutableCopy() as? UNMutableNotificationContent)
if let bestAttemptContent = bestAttemptContent {
// Modify the notification content here...
bestAttemptContent.title = "\(bestAttemptContent.title) [modified]"
contentHandler(bestAttemptContent)
}
}
override func serviceExtensionTimeWillExpire() {
// Called just before the extension will be terminated by the system.
// Use this as an opportunity to deliver your "best attempt" at modified content, otherwise the original push payload will be used.
if let contentHandler = contentHandler, let bestAttemptContent = bestAttemptContent {
contentHandler(bestAttemptContent)
}
}
}
It does not print anything or hit any breakpoints. The notification payload looks like this:
{
"Simulator Target Bundle": "my.bundle",
"aps": {
"alert": {
"title": "Its title",
"body": "Very nice text"
},
"sound": "default",
"category": "CustomSamplePush",
"mutable-content": 1
}
}
Things I've tried:
Ensured the minimum version matches that of the application.
Configured info.plist, including UNNotificationExtensionCategory.
Ensured "Copy Only When Installed" is unchecked.
The Content extension works. However, prints and breakpoints are also not working.
I've shortened my code as much as possible. The problem is that when I click on the "Generate" button inside CreateView, I am transferred to WaitView for a tenth of a second, after which I am transferred back to CreateView.
I quickly realized that the problem was a modification of the DataManager, since when I deleted this code:
dataManager.data.append(SomeData(data: newData))
this problem disappeared. But this obviously doesn’t suit me, because I need to change the data.
I also noticed that if you remove this code from ListView, then everything will work:
NavigationLink(destination: CreateView(dataManager: dataManager)) {
Text(data_item.data)
}
I can't imagine how this should affect this at all.
What could be the problem?
code:
import Foundation
import SwiftUI
struct SomeData: Identifiable {
let id = UUID()
var data: String
}
class DataManager: ObservableObject {
@Published var data: [SomeData]
init() {
data = [SomeData(data: "test")]
}
}
struct ContentView: View {
@StateObject var dataManager: DataManager = DataManager()
var body: some View {
NavigationView {
ListView(dataManager: dataManager)
.navigationTitle("First View")
}
}
}
struct ListView: View {
@ObservedObject var dataManager: DataManager
var body: some View {
NavigationView {
VStack {
NavigationLink(destination: CreateView(dataManager: dataManager)) {
Text("GENERATE")
.font(.title)
.foregroundColor(.white)
.padding()
.frame(width: 200, height: 200)
.background(Color.blue)
.clipShape(Circle())
}
.padding(100)
Spacer()
VStack (alignment: .leading) {
Text("History")
.font(.title3)
List {
ForEach(dataManager.data) {data_item in
NavigationLink(destination: CreateView(dataManager: dataManager)) { //When I remove this line everything works
Text(data_item.data)
}
}
}
.listStyle(.automatic)
.cornerRadius(20)
}
.padding()
}
}
}
}
struct CreateView: View {
@ObservedObject var dataManager: DataManager
@State var fieldData: String = "some data here"
var body: some View {
UITableView.appearance().backgroundColor = .clear
return VStack {
NavigationLink(destination: WaitView(dataManager: dataManager, newData: fieldData)) {
Text("Generate")
.padding()
.background(Color.red)
}
}
.navigationBarTitleDisplayMode(.inline)
}}
struct WaitView: View {
@ObservedObject var dataManager: DataManager
let newData: String
var body: some View {
Text("Wait for something...")
.navigationTitle("Third View")
.onAppear {
dataManager.data.append(SomeData(data: newData))//When I remove this line everything works
print("adding")
}
}
}