Jeffrey Linwood - Build Location Apps on iOS with Swift: Use Apple Maps, Google Maps, and Mapbox to Code Location Aware Mobile Apps

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Jeffrey Linwood

Build Location Apps on iOS with Swift

Use Apple Maps, Google Maps, and Mapbox to Code Location Aware Mobile Apps

1st ed.

Jeffrey Linwood

Austin, TX, USA

Any source code or other supplementary material referenced by the author in this book is available to readers on GitHub via the books product page, located at www.apress.com/978-1-4842-6082-1 . For more detailed information, please visit http://www.apress.com/source-code .

ISBN 978-1-4842-6082-1 e-ISBN 978-1-4842-6083-8

https://doi.org/10.1007/978-1-4842-6083-8

Jeffrey Linwood 2020

Apress Standard

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Table of Contents

About the Author

Jeffrey Linwood

is an experienced software developer who has worked on many iOS and Android apps that use maps or location functionality. Hes also taught and mentored college student application teams as they develop their first iOS apps. While teaching, he noticed a lack of good sample applications and tutorials for map and location applications. Jeff also enjoys running, hiking, and spending time with his wife, Clover, in Austin, Texas. You can follow Jeff on Twitter at @jefflinwood, or on his blog, https://www.jefflinwood.com .

About the Technical Reviewer

Felipe Laso

is a Senior Systems Engineer working at Lextech Global Services. Hes also an aspiring game designer/programmer. You can follow him on Twitter at @iFeliLM or on his blog.

Jeffrey Linwood 2020

J. Linwood Build Location Apps on iOS with Swift https://doi.org/10.1007/978-1-4842-6083-8_1

1. Creating Your First MapKit App

Jeffrey Linwood

(1)

Austin, TX, USA

This book will be project based starting out simple and then getting more complicated. With that in mind, our first iOS app will only be one screen that displays a map. That map will have one pin on it, with the location of my city, Austin, Texas. Feel free to use your own town for this example, of course!

Getting started

The first step is to make sure that you have a recent version of Xcode (at the time of writing, Xcode 11) installed on your Mac. If youre using earlier versions of Xcode, this code may not compile, and you may not be able to follow directions. Xcode is free and may be downloaded from the Mac App Store or from Apples developer portal.

Well also be using the Swift programming language , instead of Apples older programming language for iOS, Objective-C. Almost all of this book would be directly applicable to an Objective-C application. The underlying application programming interfaces (APIs) used in iOS are generally the same.

The Swift language has been evolving since its first release. This book uses Swift 5, which is supported in Xcode 10 and above.

Go ahead and open up Xcode, and create a new application. Well be creating a new Single View Application (Figure ).

Figure 1-1

New project window in Xcode

Click the Next button, and then name your new project on the options dialog, as seen in Figure . Im going to call the new application FirstMapsApp and give it an organization identifier of com.buildingmobileapps.maps and use my name for the Organization Name.

Figure 1-2

New project options for an iOS app

Be sure to choose Swift as the Language.

For this project, we will not be using SwiftUI we will be using UIKit as the application framework. Leave the SwiftUI check box unchecked.

We do not need to include Core Data in our project Core Data is an Apple technology used for storing data locally on iOS, and we wont need it for this example. We wont be using Core Data in this book.

You can also uncheck Include Unit Tests and Include UI Tests, as we wont be setting up any tests for this project.

Click Next, and save the project in a convenient location. You can create a Git repository for your code if you want, but we wont be directly addressing source control in this book. Its always a good idea to keep up with Git commits as your project goes along, so that you can easily roll back to a working copy.

After saving your project, Xcode will open your project and present an overview of your application (Figure ).

Figure 1-3

Project overview

You should now have a working Xcode project go ahead and run it in one of the iOS Simulators , for instance, the iPhone XR (Figure ).

Figure 1-4

New iOS application running in a simulator

You should expect to see a blank screen, as we have not written any code for our application yet. If you do, your development environment is set up and ready to go for the rest of this chapter.

Adding a map

Now its time to add a map to our view controller. Select the storyboard on the left-hand side; it is the file named Main.storyboard . Once the storyboard opens, select the View Controller Scene.

In the upper right-hand corner of your Xcode window, choose the left-most button (the Object library), which is the button with the plus sign in the previous figure, as shown in Figure .

Figure 1-5

Choosing an MKMapView map from the Object library in Xcode

Either type Map into the search box underneath the list or scroll down until you find the Map Kit View. Once you have found the Map Kit View, drag it onto your view controller (Figure ).

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