swiftui

问题 So I have a dynamic link that is working in that it opens up the app when I click on it but the handling of the dynamic link doesn't happen. This is because application function seen below is never entered and I'm not sure why... func handleIncomingDynamicLink(_ dynamicLink: DynamicLink){ guard let url = dynamicLink.url else { print("That's weird. My dynamic link object has no url") return } print("Your incoming link parameter is \(url.absoluteString)") } func application(_ application:

问题 I want to set the selected row in a List programmatically. In my example below via 2 Buttons. struct ContentView: View { @State private var selection = 2 var body: some View { VStack { List() { //List(selection: $selection) {. // does not compile Text("Line 0").tag(1) Text("Line 1").tag(1) Text("Line 2").tag(2) Text("Line 3").tag(3) Text("Line 4").tag(4) Text("Line 5").tag(5) } .listStyle(SidebarListStyle()) Text("Selected Item :\(self.selection)") HStack { Button(action: {if (self.selection

问题 I want to build a very simple iOS 14 sidebar using SwiftUI. The setup is quite simple, I have three views HomeView , LibraryView and SettingsView and an enum representing each screen. enum Screen: Hashable { case home, library, settings } My end-goal is to automatically switch between a tab view and a sidebar depending on the size class but some things don't quite work as expected. The global state is owned by the MainNavigationView , which is also the root view for my WindowGroup . struct

问题 On few screens of my SwiftUI app I am using Divider() between few elements. This Divider is rendered as a very thin grey (or black?) line. I am guessing 1 point. How can I change the width of Divider()? 回答1: You can create any divider you wish, colors, width, content... As in below example. struct ExDivider: View { let color: Color = .gray let width: CGFloat = 2 var body: some View { Rectangle() .fill(color) .frame(height: width) .edgesIgnoringSafeArea(.horizontal) } } 回答2: For anyone

问题 I want to add a (WidgetKit-)widget to my iOS app. The app itself should keep a target of < 14. Obviously, the widget would be available only on those devices >= 14, but the app should run on all other devices as well. Is this possible? 回答1: Yes, you can as I develop the Widgets on an iOS13 Xcode project. You can see them on an iPhone that runs iOS14 and not on the iOS13 one. You just need to add @available(iOS14) in your code because you are using WidgetKit. But don't worry, Xcode will remind

问题 I want to add a (WidgetKit-)widget to my iOS app. The app itself should keep a target of < 14. Obviously, the widget would be available only on those devices >= 14, but the app should run on all other devices as well. Is this possible? 回答1: Yes, you can as I develop the Widgets on an iOS13 Xcode project. You can see them on an iPhone that runs iOS14 and not on the iOS13 one. You just need to add @available(iOS14) in your code because you are using WidgetKit. But don't worry, Xcode will remind

问题 My view needs an environment object which is set in the SceneDelegate by adding it to the window.rootViewController. How can I set an environment object to be used for the preview? 回答1: You add it using .environmentObject(_:) modifier: struct ContentView_Previews: PreviewProvider { static var previews: some View { ContentView() .environmentObject(YourObject()) } } 回答2: This userData property gets its value automatically, as long as the environmentObject(_:) modifier has been applied to a

问题 My view needs an environment object which is set in the SceneDelegate by adding it to the window.rootViewController. How can I set an environment object to be used for the preview? 回答1: You add it using .environmentObject(_:) modifier: struct ContentView_Previews: PreviewProvider { static var previews: some View { ContentView() .environmentObject(YourObject()) } } 回答2: This userData property gets its value automatically, as long as the environmentObject(_:) modifier has been applied to a

问题 After hours of debugging I figured out the error is inside the foreach loop in MenuItemView in the folder ContentViews . The app crashes and the error is: Fatal error: Index out of range: file Swift/ContiguousArrayBuffer.swift, line 444 . Information: I have got an ObservableObject with an Array of Structs inside as data storage. The problem: The ForEach goes between 0 and the array count + 1. This is so I can have an extra item for adding new elements. In the ForEach is a check if the index

问题 After hours of debugging I figured out the error is inside the foreach loop in MenuItemView in the folder ContentViews . The app crashes and the error is: Fatal error: Index out of range: file Swift/ContiguousArrayBuffer.swift, line 444 . Information: I have got an ObservableObject with an Array of Structs inside as data storage. The problem: The ForEach goes between 0 and the array count + 1. This is so I can have an extra item for adding new elements. In the ForEach is a check if the index