Hi. I'm working my way through chapter 4 of the "Learning Core Audio" book. Before that I tried recording audio using the AudioToolbox with Swift. No matter what I do, I only record silence.
Having tried several examples from different sources I'm pretty sure my source code is not the issue. I enabled "Audio Input" for my target in XCode. I disconnected all external audio inputs and uninstalled a DAW that had created an aggregate I/O device. Still I'm not hearing anything from the file that's supposed to play my recorded audio.
Does anyone have an idea or has faced the issue before? Thanks in advance.
stebo
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Hi. I have a simple view:
struct ContentView: View {
var body: some View {
VStack {
List {
Text("Test")
}
}
.drawingGroup()
}
}
When I run my app I get an error message
Unable to render flattened version of ListRepresentable<SystemListDataSource, SelectionManagerBox>.
and a forbidden symbol:
This happens only with drawingGroup applied. Can't Lists be rendered with Metal?
Hi. I have a button that triggers a request to a webservice:
struct ContentView: View {
@StateObject private var state: State = State()
var body: some View {
VStack {
Button("Request", action: { makeRequest() })
Text(state.response)
}
}
private func makeRequest() {
URLSession.shared.dataTask(with: URL(string: "https://my-json-server.typicode.com/typicode/demo/posts/1")!, completionHandler: { data, _, _ in
state.response = String(bytes: data!, encoding: .utf8)!
})
.resume()
}
}
and an ObservableObject to store the response in:
class State: ObservableObject {
@Published var response: String = ""
}
.
It seems to workd, but, I get the error message
[SwiftUI] Publishing changes from background threads is not allowed; make sure to publish values from the main thread (via operators like receive(on:)) on model updates.
So I was wondering if this is the correct way to store the responses of HTTP requests in a StateObject. I also couldn't find anything about receive(on:).
I tried the example from https://developer.apple.com/documentation/swiftui/editmode. It's not working for me.
struct ContentView: View {
@Environment(\.editMode)
private var editMode
@State
private var name = "Maria Ruiz"
var body: some View {
NavigationView {
Form {
Text(String(editMode!.wrappedValue.isEditing))
if editMode?.wrappedValue.isEditing == true {
TextField("Name", text: $name)
} else {
Text("test")
}
}
.animation(nil, value: editMode?.wrappedValue)
.toolbar { // Assumes embedding this view in a NavigationView.
EditButton()
}
}
}
}
It shows the texts "false" and "test", before and after clicking Edit. What am I missing? I'm using XCode 14.0.1 and the deployment target is iOS 16. I also tried on a real iPhone and on iOS 15.5 in the Simulator. Thanks for any help.
I have a NavigationSplitView and an EditButton in the same ContentView. Both do what they should, except that when I click "Edit" and then "Done", the detail view of the last selected item in my list appears. This happens only after I have clicked one of the list items, not before.
This is my code:
var body: some View {
NavigationSplitView {
List(selection: $selectedItem) {
ForEach(items, id: \.self) { item in
Text(item.timestamp!, formatter: itemFormatter)
}
.onDelete(perform: deleteItems)
}
.toolbar {
ToolbarItem(placement: .navigationBarTrailing) {
EditButton()
}
ToolbarItem {
Button(action: addItem) {
Label("Add Item", systemImage: "plus")
}
}
}
Text("Select an item")
} detail: {
NavigationLink(value: selectedItem) {
Text("Item")
}
}
}
The problem doesn't exist with a NavigationStack. Is there any way to get around this?
I have a view that is part of a larger view. I have a preview of that part, but XCode draws a device (some iPhone model by default) around it. I can choose a different device with .previewDevice(PreviewDevice(rawValue: "...")). I found a screenshot of what I want to do, so I assume it's possible somehow:
Unfortunately where I found the screenshot was not described how to do this. I tried previewDevice(.none), but that at least didn't do what I want. I'm using XCode version 14.3 Release Candidate, but can switch back version 14.2. Does anyone have an idea?