You could use local notification. To illustrate: bus 1 leaves at 8:00 bus 2 leaves at 8:30 bus 3 leaves at 9:00 It is 7:45 bus 1 shows at top of scrollView you post a notification to trigger at 8:00 (when bus 1 has departed) It is 8:00 the action of notification will scrollToItem 2 : the next bus in the timetable after 8:00 and post a new notification to fire at 8:30 It is 8:30 the action of notification will scrollToItem 3 : the next bus in the timetable after 8:30 etc… See: https://stackoverflow.com/questions/52009454/how-do-i-send-local-notifications-at-a-specific-time-in-swift

I hope this may help a little: h t t p s : / / w w w.hackingwithswift.com/articles/179/capture-lists-in-swift-whats-the-difference-between-weak-strong-and-unowned-references

I've run into that learning block where the next thing I want to do seems to demand I know ten other things which all demand each other. That's the usual problem when you start in a new area of iOS. So many thinks intertwined to master. That's why I usually start with a simple design, just to make it work (my initial proposal). Then progressively evolve it to really do as expected. Now to your questions: What, if any, special VC or container I need for the detail view (on the split). When you create a splitViewController, in Interface builder, it creates automatically 4 VC for you. In older versions of Xcode it also created the classes templates. Now, look for some tutorial, such as for instance h t t p s : / / w w w.raywenderlich.com/4613809-uisplitviewcontroller-tutorial-getting-started What I need to do to make a button change the view. Which button ? The one in the list on the left panel ? If so, that's a basic mechanism, look at tutorial How to attach a segue to the view change. I don't understand. You want to have a segue which would be triggered when ? Which view do you mean ? 3 I'm assuming needs to programmatic (i.e., not interface builder) It depends where do you segue from and to.

Problem with iOS is that you have no hover capability as with MacOS. I have no link to tutorial on this, but a few ideas to propose. Help user start Usually, on the first view, user has to select some action (in general, tapping a button). You could flash this button after a few seconds if user has not tapped anything, to attract its attention. Provide a help button on each page, with a short message, possibly spoken to avoid fastidious reading.

The reason I have a loop is because I want to define all the objects in my array called prefArr as saveFav when the save button is pressed and I try to save them to the context. OK, but you create a single instance. Why don't you create in the loop ? Code could become like this:  @IBAction func save(_ sender: UIBarButtonItem) {     // -->> NOT HERE var saveFav = CurrentPlayers(context: context)     // Assign values to the entity's properties     for o in prefArr { var saveFav = CurrentPlayers(context: context) // <<-- Create a new instance each time here      saveFav.yahooName = o.yahooName      saveFav.team = o.team      saveFav.position = o.position      saveFav.photoUrl = o.photoUrl      // To save the new entity to the persistent store, call save on the context       do { // <<-- Save each        try context.save()        fetchSave() // Not sure it is needed      print("This is my saved object: \(saveFav)")       } catch {        print(error)      }     }   }

Why did you comment out:              //pdfView = PDFKitRepresentedView(pdfData)

This is just a personal opinion. But I'm not comfortable to develop app (Mac or iOS) with SwiftUI. Because of maturity and because of what I perceive as a lack of flexibility. It is really impressive on demo projects, but not on full scale large app. In addition, I find that programming the UI in code is a major step backward… Once again, just a personal opinion.

@dkardell ß7 of what ? iOS ? That's not IMHO where the problem is, more in XCode.

That seems to be a fairly resistant bug 😉

You need to provide some info: what is the output from the print statement above ? how is languagesLabels defined ?: show the complete definition. Are you sure it is not nil ? what is key ?

When I try the same code, I get a different error: Key path value type 'Bool' cannot be converted to contextual type 'Published.Publisher.Output' (aka 'Int') If I understand your code, you try to assign segmentNumber which is Int to isEnabled which is Bool.

From your code, I do not see that ePrecedence is in a different module than dPrecedence. See the doc example: // module Swift precedencegroup Additive { higherThan: Range } precedencegroup Multiplicative { higherThan: Additive } // module A precedencegroup Equivalence { higherThan: Comparative lowerThan: Additive // possible, because Additive lies in another module } infix operator ~ : Equivalence 1 + 2 ~ 3 // same as (1 + 2) ~ 3, because Additive > Equivalence 1 * 2 ~ 3 // same as (1 * 2) ~ 3, because Multiplicative > Additive > Equivalence 1 < 2 ~ 3 // same as 1 < (2 ~ 3), because Equivalence > Comparative 1 += 2 ~ 3 // same as 1 += (2 ~ 3), because Equivalence > Comparative > Assignment 1 ... 2 ~ 3 // error, because Range and Equivalence are unrelated Note: names of groups should better start as UpperCase, like Dprecedence or DPrecedence.

When you open the "old" project in new XCode (with more recent SwiftUI), don't you see, in Issue Navigator, a proposal to update to new Settings ? Start doing so and see if you get compilation errors then.

You have to define such a view. Add after this code: struct ContentView: View { var body: some View { Text("Hello") } }

You should find an answer here: https://stackoverflow.com/questions/30749459/setting-applelanguages-doesnt-change-app-language