CoreDataModel | Example application on how to use Protocol | Networking library

This might be occurring with passing an invalid URL for the store description. Unless you need to run tests with a NSSQLiteStoreType, which is the default for NSPersistentContainer, you may want to consider using an NSInMemoryStoreType for unit testing. A small tweak to your CoreDataManager class could allow you to initialize the class both for your app and unit tests. For example:

It looks like this condition:

I think you can try this, first load the ui with the existing local data. At the same time, make a call to your api on a background queue. Once the api results are available, filter for duplicates, then persist it locally. Then the last step is to notify the ui to reload.

This pseudo-code is a bit UIKit specific, however the same logic can be applied to when in SwiftUI. You won't need closure, you will compute directly to your publisher object, and ui will react based any new emits.

In your ItemFeedTableViewCell, store the ManagedObjectID of the RSSFeed object when you create the cell. Then later, when you click the read button on your custom ItemFeedTableViewCell, just simply use that ManagedObjectID to lookup the record in the RSSFeed table and set the read value to YES.

An approach to dealing with an Xcode which seems to be getting more and more buggy with each release in recent years:

• Quit and relaunch Xcode.
• If that does not work, do a Show Package Contents on the .xcodeproj package and open the .pbxproj file in a text editor. Search the file for occurrences of XXX+CoreDataClass. The search the file for occurrences of some other .swift file which does not create this warning. Compare the two search results. It may be necessary to manually edit the .pbxproj file.

If you removed if from if let , then you have to remove { } also , You can try

After recreating another Core Data App, I found out that the Current Product Module is avoiding human generation and placing that dot before that h file importing line. Once I delete the Current Product Module, everything goes fine!

I have no idea why this happens, and how to deal with this problem in a correct way. Anyone who has the knowledge about this please help.

It seems to be some sort of race condition. You are setting the barTintColor at the same moment that the navigation controller is starting its animation. If you make sure you don't change the tin color until after the animation is complete, it will work the way you want.

Also, you have two different binders to rx.barTintColor of the same navigation bar and they are feeding the bar conflicting information. You should only have a single binder if at all possible.

You can't create a predicate that matches all properties unless the predicate lists every single property. There's no "wildcard" matching or "all properties" option. Your predicate would have to be something like attrib1 == "value" OR attrib2 == "value" OR ....

This is possible but it will be extremely slow. For every instance you check, you will need to do one string comparison per attribute. In your case, 50 string comparisons for every object you save. You should consider changing your requirements, if possible, because the results will not be good.

You could dynamically build a predicate with something like the following. I don't recommend it, for reasons described above, but it should work-- slowly.