swiftui

I'm trying to build a FlowStack (a container view that will layout its children on rows, depending on their size and how they fit the parent). The problem I'm facing is that SwiftUI calculates the size of the children (even if implicit) only at a later time, so I can't get it like we used to `view.bounds.width` right after I create the `View` I tried using `anchorPreferences`, these sort of work, however they do not allow me to rearrage the children, but create new ones in foreground or background, so it's a bit useless for my purpose.How can we get the implicit child size from the parent?

The Destination of a NavigationLink is instantiated, but not displayed, when the View with the NavigationLink is instantiated. If the destination view then performs a significant amount of processing every time the origin view changes, but prior to the destination view needing display, there can be significant degradation of app performance. E.g. I've added SwiftUI Views to an existing app in order to analyse accumulated data; the user selects filter and statistics parameters from Pickers prior to pressing the Calculate button (NavigationLInk). The Link destination is instantiated and executed (eg data calculations)every time a property (e.g. filter selection) changes in the origin view before the user has pressed the Calculate button.Also, I assume that all subviews of a View are instantiated when the parent View is instantiated, even though they may not all be on screen. Add to this the fact that ObservedObjects, when changed, trigger a redisplay of any/all? containing Views.So, all of this leads m

App was submitted to app store for approval but the binary was rejected as follows:Guideline 2.1 - Performance - App CompletenessWe were unable to review your app as it crashed on launch. We have attached detailed crash logs to help troubleshoot this issue.Next StepsTo resolve this issue, please revise your app and test it on a device to ensure it will launch without crashing.However, the app works perfectly and has been tested on some physical devices,iPhone X and iPad Pro3,each running iOS 12.4.1Also, the app has been tested to work fine on basically any simulator from iOS 11.x up to current 12.4.1 within the XCode test environment.All work perfectly.My current development environment is: macOS 10.14.6 (18G95) (current) XCode Version 10.3 (10G8) (current) Creating apps up to iOS 12.4 (current until 3 days ago) Deplyment target at minimum 11.1The crash report sent by apple review indicates that it crashes on initial load.They are using a simulator @ iOS 13.1I believe this is the problem.I can see that XCode

I made a ImagePicker in SwiftUI to pick a photo from the photo library. When the image was picked and shown by Image in a view, if I rotate the screen from portrait to landscape, the image disappeared. It behaves differently on different devices, e.g. on my colleague's device, the whole screen went black when rotating to landscape. And it is not always reproducible. But once it happens, it happends forever. I saw another post in this forum (https://forums.developer.apple.com/thread/119691) but I am not sure if they are the same issue. To check my code please refer to https://github.com/zjkuang/ImagePickerSwiftUI

So I'm transfering from using the interface builder to using SwiftUI and had a major question: How do we do the same thing we did with segues with SwiftUI? For example just two different views with a button that will send you from one ContentView to another? Sorry this is probably a very basic question but I haven't been able to find any simple solutions to this. Thanks!

I want to create an App with SwiftUI, which uses Bluetooth. I worked a little with CoreBluetooth and UIKit in the past, but how can I implement CoreBluetooth in a SwiftUI project?