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SwiftUI Cookbook

You're reading from   SwiftUI Cookbook Discover solutions and best practices to tackle the most common problems while building SwiftUI apps

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Product type Paperback
Published in Oct 2020
Publisher Packt
ISBN-13 9781838981860
Length 614 pages
Edition 1st Edition
Languages
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Authors (2):
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Edgar Nzokwe Edgar Nzokwe
Author Profile Icon Edgar Nzokwe
Edgar Nzokwe
Giordano Scalzo Giordano Scalzo
Author Profile Icon Giordano Scalzo
Giordano Scalzo
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Toc

Table of Contents (15) Chapters Close

Preface 1. Chapter 1: Using the Basic SwiftUI Views and Controls 2. Chapter 2: Going Beyond the Single Component with Lists and Scroll Views FREE CHAPTER 3. Chapter 3: Viewing while Building with SwiftUI Preview 4. Chapter 4: Creating New Components and Grouping Views in Container Views 5. Chapter 5: Presenting Extra Information to the User 6. Chapter 6: Drawing with SwiftUI 7. Chapter 7: Animating with SwiftUI 8. Chapter 8: Driving SwiftUI with Data 9. Chapter 9: Driving SwiftUI with Combine 10. Chapter 10: Handling Authentication and Firebase with SwiftUI 11. Chapter 11: Handling Core Data in SwiftUI 12. Chapter 12: Cross-Platform SwiftUI 13. Chapter 13: SwiftUI Tips and Tricks 14. Other Books You May Enjoy

Adding sections to a list

In this section, we will create an app that implements a static list with sections. The app will display a partial list of countries grouped by continent.

Getting ready

Let's start by creating a new SwiftUI app in Xcode and name it ListWithSections.

How to do it…

We will add section views to our list view. We will then add a few countries to each of the sections. Proceed as follows:

  1. (Optional) open the ContentView.swift file and replace the Text view in the body with a navigation view. Wrapping the list in a navigation view allows you to add a title and navigation items to the view:
    NavigationView {
    }
  2. Add a list and section to the navigation view:
    List {
      	Section(header: Text("North America")){
        		Text("USA")
               Text("Canada")
               Text("Mexico")
               Text("Panama")
               Text("Anguilla")
          }
    }
  3. Add a listStyle(..) modifier to the end of the list to change its style from the default plain style to GroupedListStyle():
    List {
      	.
    	.
    	.
     }
    .listStyle(GroupedListStyle())
    .navigationBarTitle("Continents and Countries",   displayMode: .inline)
  4. (Optional) add a navigationBarTitle(..) modifier to the list, just below the list style. Add this section if you included the navigation view in step 1.
  5. Add more sections representing various continents to the navigation view. The resulting ContentView struct should look as follows:
    struct ContentView: View {
        var body: some View {
            NavigationView{
                List {
                    Section(header: Text("North America")){
                        Text("USA")
                        Text("Canada")
                        Text("Mexico")
                        Text("Panama")
                        Text("Anguilla")
                    }
                    Section(header: Text("Africa")){
                        Text("Nigeria")
                        Text("Ghana")
                        Text("Kenya")
                        Text("Senegal")
                    }
                    Section(header: Text("Europe")){
                        Text("Spain")
                        Text("France")
                        Text("Sweden")
                        Text("Finland")
                        Text("UK")
                    }
                }
            .listStyle(GroupedListStyle())
                .navigationBarTitle("Continents and                Countries", displayMode: .inline)
            }
        }
    }

    The canvas preview should now show a list with sections, as follows:

Figure 2.9 – ListWithSections preview

Figure 2.9 – ListWithSections preview

Good work! Now, run the app live preview and admire the work of your own hands.

How it works…

SwiftUI's sections are used to separate items into groups. In this recipe, we used sections to visually group countries into different continents. Sections can be used with a header, as follows:

Section(header: Text("Europe")){
                    Text("Spain")
                    Text("France")
                    Text("Sweden")
                    Text("Finland")
                    Text("UK")
                }

They can also be used without a header:

Section {
               Text("USA")
               Text("Canada")
               Text("Mexico")
               Text("Panama")
               Text("Anguilla")
         }

When using a section embedded in a list, we can add a .listStyle() modifier to change the styling of the whole list.

You have been reading a chapter from
SwiftUI Cookbook
Published in: Oct 2020
Publisher: Packt
ISBN-13: 9781838981860
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