Conventions used

There are a number of text conventions used throughout this book.

Code in text: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: “In order to create explicit animations, you use the .animation(_: value:) modifier rather than the simpler .withAnimation closure.”

A block of code is set as follows:

// if you are using Xcode 14.x you will need this syntax for the preview functionality:
struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

[default]
// if you are using Xcode 15 or later, the preview can be simplified as follows:
#Preview {
  ContentView()
}

Any command-line input or output is written as follows:

$ cd projectFolder
$ open .

Bold: Indicates a new term, an important word, or words that you see on screen. For instance, words in menus or dialog boxes appear in bold. Here is an example: “Select Settings from the Xcode menu.”

Tips or important notes

Appear like this.