Bookworm Challenges

Another set of challenges for a #100DaysofSwiftUI tutorial app. Project 11 was a book tracking app – the big new thing was using CoreData. Here’s the challenges for it.

Right now it’s possible to select no title, author, or genre for books, which causes a problem for the detail view. Please fix this, either by forcing defaults, validating the form, or showing a default picture for unknown genres – you can choose.

The genre is already forced since it uses a picker, but I added a default (plain grey) image to deal with the situation that there’s no data for it in a record. It doesn’t make sense to provide defaults for the title or author, but some validation to ensure those fields are not empty is worthwhile.

Section {
    Button("Save") {
        let newBook = Book(context: moc)
        newBook.id = UUID()
        newBook.title = title
        newBook.author = author
        newBook.rating = Int16(rating)
        newBook.genre = genre
        newBook.review = review
        newBook.date = Date()

        try? moc.save()
        dismiss()
    }
}
.disabled(title.isEmpty || author.isEmpty || genre.isEmpty)

Modify ContentView so that books rated as 1 star are highlighted somehow, such as having their name shown in red.

Straightforward, with use of the ternary operator.

Add a new “date” attribute to the Book entity, assigning Date.now to it so it gets the current date and time, then format that nicely somewhere in DetailView.

1. Add the date field to the datamodel
2. Set it to current date in the Save of the AddView
3. Showing it in the Detail View was a little more interesting – adding a test to ensure it was in the database – since we’ve now got two versions of these records.

Text(book.author ?? "Unknown author")
    .font(.title)
    .foregroundColor(.secondary)

let date = book.date ?? Date()
Text(date.formatted(.dateTime.day().month().year()))
    .foregroundColor(.secondary)
    .opacity(date == book.date ? 1 : 0)
            
Text(book.review ?? "No review")
    .padding()