Creating sample data

As you saw in Chapter 14, Getting Started with MVC and Table Views, you can use an array as the data source for a table view. You will now create a structure that has an array property containing three sample journal entries.

Click the JournalEntry file in the Project navigator, and type in the following after the JournalEntry class declaration:

// MARK: - Sample data
struct SampleJournalEntryData {
  var journalEntries: [JournalEntry] = []
  mutating func createSampleJournalEntryData() {
    let photo1 = UIImage(systemName: "sun.max")
    let photo2 = UIImage(systemName: "cloud")
    let photo3 = UIImage(systemName: "cloud.sun")
    guard let journalEntry1 =  JournalEntry(rating: 5, title: "Good", body:
    "Today is a good day", photo: photo1) else {
      fatalError("Unable to instantiate journalEntry1")
    }
    guard let journalEntry2 = JournalEntry(rating: 0, title: "Bad", body...