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Day 55

Saurabh Jamadagni
26th September, 2022

  • Creating previews when there is a CoreData object involved is tricky. Because that means creating a new instance of managed object context.
  • This will require importing CoreData. // This isn't working currently. Probably the new Xcode update.

Creating a managed object context involves telling the system what concurrency type we want to use.

  • When you want to use a UI component that allows a binding variable to change the UI, but you want to use it statically then just pass it as constant.

Sorting fetch requests

  • Done using the SortDescriptor.
  • Default is an ascending sort, but can be reversed.
  • You can sort by multiple fields. For example, we may want to sort books by author first and then ratings.
  • To do this add one more SortDescriptor using a comma.
@FetchRequest(sortDescriptors: [
    SortDescriptor(\.title),
    SortDescriptor(\.author)
]) var books: FetchedResults<Book>

Deleting from the fetch request

  • Here as we have a simple list, we can use the onDelete modifier. But we need to modify the modifier a little because we are no longer just deleting from an array.
  • Pass in the index offsets and delete the respective book.
  • Don't forget to save. It is not an array!

Programatically going back a navigation view

Apple provides very clear guidance on how we should label alert text, but it comes down to this: if it’s a simple “I understand” acceptance then “OK” is good, but if you want users to make a choice then you should avoid titles like “Yes” and “No” and instead use verbs such as “Ignore”, “Reply”, and “Confirm”.

  • Here you basically use the Environment variable of dismiss. Call it when a certain action during the alert is triggered.

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