libdispatch | You almost certainly want this instead https | Reactive Programming library

You probably won't find this in the Swift code because it isn't Swift. This is just a front end for Cocoa's OS_dispatch_queue etc., which are not open source. It's not part of the Swift library; it's an iOS thing, not a language thing.

if you have "Sign In with Your Apple ID" instead of "Apple Developer Program", you have only run one project on your real device. Also you have only one device register your membership during the free memberships.

compare memberships details

According to Apple, receive(on:options:) runs callbacks on a given queue.

Not exactly. Here's what the documentation actually says:

You use the receive(on:options:) operator to receive results and completion on a specific scheduler, such as performing UI work on the main run loop. In contrast with subscribe(on:options:), which affects upstream messages, receive(on:options:) changes the execution context of downstream messages.

(Emphasis added.) So receive(on:) controls the Scheduler used to call a Subscriber's receive(_:) and receive(completion:) methods. It does not control the Scheduler used to call the Subscription's request(_:) or cancel() methods.

To control the Scheduler used to call the Subscription's cancel() method, you need to use the subscribe(on:options:) operator downstream of the handleEvents operator, like this:

I fixed this issue in Xcode by amending the runtime API checking.

Navigate to:

Product > Scheme > Edit Scheme > Run / Debug > Diagnostics

then deselect Main Thread Checker

you can try below step. may be helped you with these steps.

1. clean your project

2. CODE_SIGNING_REQUIRED = YES.

3. and must be delete “CODE_SIGNING_ALLOWED” key pair value under User-Defined settings.

4. Set "Code Signing Identity" parameter in "Build settings" (Both "Target" and "Project") ( in past previuse state/value) thatmeans must back to previuse value when change it.

5. finally restart xcode.

if you try to make unsigned ipa file. then change something. you must be back all changeable settings like previous settings.

then try build. best of luck!

ForEach is unable to identify the each item uniquely, make sure your data model struct is confirm to identifiable protocol

try this on

You are animating a hidden view, and also inserting an async dispatch inside the animation block which changes the hidden state ... this seems wrong to me.

Try this code, which animates the alpha property and uses completion block to turn on hidden property when hiding.

Are you running your app on your device (e.g. Mac, iPad, or iPhone?), as opposed to a Simulator? On StackOverflow, try to give as much detail as possible, that's why lenz meant. It seems like you're building a Flutter app to run on iPhone, not your macbook?

Have a read of this, especially (but not only), the "Select a Real Device" section.

If you choose a real device, add your Apple ID in Accounts preferences and assign the project to a team on the Signing & Capabilities pane of the project editor. A single individual constitutes a one-person team. For macOS apps, you need to code sign the app if you enable certain capabilities. If you belong to the Apple Developer Program, you need to register the device before you can run the app.

You need to

• log into Xcode with your Apple ID. You don't need the $99 Apple Developer program membership.
• Check automatically manage signing in "Signing and Capabilities" tab

If you're building a macOS app without signing it, either:

• Disable code signing: follow this
• Code sign it: follow this

According to the log, inside updateCoreML(), you are calling something that has to do with UIKit changes.

Can you try wrapping this function in the following matter?