41,767 questions
3
votes
2
answers
1k
views
Why/when are uninitialized non-optional values allowed in Swift for EnvironmentObjects?
In Swift, this crashes at runtime:
class EmptyData: BindableObject {
let didChange = PassthroughSubject<EmptyData, Never>()
}
struct RandomView : View {
@EnvironmentObject var ...
CommunityBot
- 1
9
votes
2
answers
2k
views
Issue when using Xcode 11 running Canvas on macOS Catalina
I have Catalina macOS version (10.15) installed and still the canvas is not showing up.
The error message I get from Xcode is
Select a scheme that builds a target which contains the current file,
...
- 8,338
0
votes
1
answer
71
views
How do I load a View with a View name? For example, I have a struct TextPage: View , how do I load this View via the string TextPage?
How do I load a View with a View name? For example, I have a struct TextPage: View , how do I load this View via the string TextPage ?
- 5,062
2
votes
0
answers
920
views
Reading EnvironmentObject<T> outside View.body
I constructed a BindableObject tied to my custom view.
I wanna update the array of items in this class
// in my vm:
class ViewModel {
func fetched() {
listView....
- 5,062
1
vote
2
answers
782
views
Adjusting width / horizontalAlignment with SwiftUI
I have the following layout achieved in SwiftUI:
VStack {
TextField(...)
TextField(...)
Button(...)
}
I tried making my VStack to be 50% of the superview, so I added the following modifier:
...
- 3,753
1
vote
1
answer
1k
views
Setting a height in a View and ignoring safe top edge
I want to display an MKMapView with a height that is the half of the screen's height and ignoring the top edge. This is my code:
import SwiftUI
import MapKit
struct ContentView : View {
var body:...
- 13.5k
1
vote
0
answers
238
views
Migrate UITableView's and UICollectionView's Xib in SwiftUI
I have converted my existing Xib UI in SwiftUI.
Is it possible to use SwiftUI in existing UITableView and UICollectionView?
Here is the code i have done in SwiftUI
struct LandmarkList: View {
@...
- 8,688
3
votes
1
answer
9k
views
Using swiftUI how can i add datePicker only while textField is in editing mode?
I have added datePicker for now inside HStack. I want to show datePicker only when textField is in editing mode.
struct EditProfile: View {
@Binding var profile: Profile
var body: some View {
...
- 13.9k
1
vote
1
answer
2k
views
Immutable some view body variable/opaque return in View
In Swift 5.1 there are opaque types. I see that e.g. body is a required protocol variable. It's contract is defined as follows:
var body: Self.Body { get }
It means we should be able to mark body as ...
- 10.5k
118
votes
2
answers
13k
views
What enables SwiftUI's DSL?
It seems like Apple's new SwiftUI framework uses a new kind of syntax that effectively builds a tuple, but has another syntax:
var body: some View {
VStack(alignment: .leading) {
Text("...
- 6,221
1
vote
1
answer
169
views
What is the layout system?
In UIKit we used the autolayout system. What layout system does SwiftUI use?
How does it layout the UIView in the canvas?
- 1,547
14
votes
3
answers
7k
views
Order of modifiers in SwiftUI view impacts view appearance
I'm following the first tutorial in Apple's series explaining how to create & combine views in a SwiftUI application.
In step 8 of section 6 in the tutorial, we need to insert the following code:
...
- 1,669
3
votes
2
answers
3k
views
identified(by: \.self) - what does it do? [duplicate]
In this video: https://developer.apple.com/videos/play/wwdc2019/103/, the following snippet of code is shown at around 15:30:
...
ForEach(ContentSizeCategory.common.identified(by: \.self))
...
What ...
- 1,669
2
votes
1
answer
1k
views
SwiftUI - Preview canvas gives Coordinated install error
I am trying to run the Landmark sample for the SwiftUI, but getting following error
Error Domain=IXErrorDomain Code=29 "A coordinated install for com.example.apple-samplecode.Landmarks is already ...
- 13.7k
6
votes
1
answer
8k
views
How to open SwiftUI preview side by side to the code? [duplicate]
I have created new app with swiftUI in xcode11. and not able to find Xcode preview like shown in wwdc19.
- 26.4k
2
votes
2
answers
2k
views
Swift compiler issue when running Xcode 11 using SwiftUI [duplicate]
I'm trying to get my SwiftUI Demo running but I get weird compiler issues:
'Color' is not convertible to 'Color?'
Unable to infer complex closure return type; add explicit type to disambiguate
...
CommunityBot
- 1
2
votes
1
answer
244
views
What is the property / $property syntax for bindings?
As seen in the handling user input tutorial.
struct LandmarkList: View {
@State var showFavoritesOnly = true
var body: some View {
NavigationView {
List {
...
- 10.5k