Understanding iOS Programming Abstract. All programming involves the same task of writing commands for a computer to follow. To learn iOS programming, you need to learn three different skills:. Every app needs a user interface. Unlike user interfaces for desktop operating systems like Windows or macOS that can display multiple windows on a screen at a time, iOS apps typically display a single window called a view that fills the entire screen at a time.
Also unlike Windows or macOS user interfaces that users can manipulate using a keyboard or a mouse, users must be able to manipulate iOS apps solely through a touch screen although they can also be controlled through an optional keyboard as well. In iOS apps, a user interface consists of. A simple app might only contain a handful of files, but a more complicated app could contain dozens or even hundreds of separate files that contain related Swift code. Within each file, you can further organize your Swift code into separate functions.
Instead, you can just focus on learning only the features you need and gradually learn any additional features of Xcode later. Controllers contain the user interface that appears on an iOS screen. At the simplest level, a controller can contain a view, which represents an iOS screen.
By default, this view is blank, so to make it display information or provide interaction to the user, you can add a variety of user interface objects such as buttons, text fields, labels, or sliders. A user interface must display information to the user. In addition, a user interface must also allow the user to input data such as text or numbers. Finally, a user interface must allow the user to control the app.
http://fensterstudio.ru/components/siveriq/racas-aplicacion-para.php Displaying data, accepting data, and accepting commands form the heart of any user interface. Four other user interface objects that can display information, allow input, and allow interaction in different ways include. Text fields can display text and let users edit or input new text. However if you need to display large amounts of text, a text field can be too limiting.
Once installed, launch Xcode, and you should see the following Welcome to Xcode screen:. If this is the first time you have launched Xcode, then you will see No Recent Projects in the right panel. If you have previously created projects, then you will see those listed to the right. To get started, we are going to click on Create a new Xcode project in the left panel of the welcome screen. This will take us to the new project screen:.
Since we are creating apps for iOS, make sure that you have iOS selected. Then, select Single View Application and click on Next. Now, you will see an options screen for a new project:. Product Name: The product name is your app. We are going to set ours as ExploringXcode. Team: The team is connected to your Apple account. We are going to ignore this for now, because it is not needed for this chapter. If you have a team set up, just leave it as is. We will cover this in greater detail later in the book.
Organization Name: You can set the organization name to your company name or just your name. Organizer Identifier: You will set the organizer identifier to be your domain name in reverse. For example, my website URL is cocoa. Since URLs are unique, it will ensure that no one else will have your identifier. If you do not have a domain, then just use your first and last name for now.
You will eventually have to purchase a domain if you would like to submit your app to the Apple store. Bundle Identifier: When you create a new project, Apple will combine your Product Name with your Organizer Identifier to create your unique bundle identifier.
So even if 10, people create this project, each person will have a different bundle identifier. Now, select Next, and Xcode will prompt us to save our project.
I have a dedicated folder for all my projects, but you can save it on your desktop for easy access. Your project is now open, and it is time for us to get familiar with all of the panels. If this is your first time in Xcode, then it probably will be a bit overwhelming for you. Therefore, we will break it down into five parts:. The other icons are used from time to time, which we will cover as we need them.
The Standard editor is a single panel view used to edit files. The Standard editor area is the primary area in which you. This action might not be possible to undo.
Are you sure you want to continue? Upload Sign In Join. Home Books Technology. Save For Later. Create a List. Summary This book is for beginners who want to be able to create iOS applications. Read on the Scribd mobile app Download the free Scribd mobile app to read anytime, anywhere.
Customer Feedback Preface What this book covers What you need for this book Who this book is for Conventions Reader feedback Customer support Downloading theexample code Downloading the color images of this book Errata Piracy Questions 1. Building a Foundation with Swift Playgrounds — an interactive coding environment Data types — where it all starts String Integer data type Floating-point numbers Booleans Variables and constants — where data is held Creating a variable with a String Creating a variable with an Integer Int Debug and print — detecting your bugs Adding floating-point numbers Creating a Boolean Hungarian notation Why constants versus variables?
Comments — leaving yourself notes or reminders Type safety and type inference Concatenating strings String interpolation Operations with our Integers Increment and decrement Comparison operators If-Statements — having fun with logic statements Optionals and Optional Bindings Why optionals?
Functions Let's Work Summary 3. Digging into Collections Arrays Creating an empty array Creating an array with initial values Creating a mutable array Adding items to an array Checking the number of elements in an array Checking for an empty array Retrieving a value from an array Iterating over an array Removing items from an array Dictionaries Creating a dictionary Adding and updating dictionary elements Accessing an item in a dictionary Iterating over dictionary values Iterating over dictionary keys Iterating over dictionary keys and values Checking the number of items in a dictionary Removing Items from a dictionary Sets Creating an empty set Creating a set with an array literal Creating a mutable set Adding items into a set Checking if a set contains an item Iterating over a set Intersecting two sets Joining two sets Removing items from a Set Summary 5.
Where Are We? Setting up map annotations What is an MKAnnotation?
This is a reference to the class that the restoration mechanism should turn to when it wants to reconstruct this view controller instance. However, Packt Publishing cannot guarantee the accuracy of this information. If you want an easy way to let users know when a UIButton was tapped, try setting its showsTouchWhenHighlighted property to be true. The runtime itself will tint the image, adding a shine effect. Assuming little or no working knowledge of the Swift programming language, and written in a friendly, easy-to-follow style, this book offers a comprehensive course in iPhone and iPad programming. Swift Books Swift has been years in the making, and it continues to evolve with new features and capabilities.
Where's My Data? Understanding a JSON file Exploring the API Manager file Location list Selecting a location Passing a selected location back to Explore View Getting the last selected location Passing location and cuisine to the restaurant list Building our restaurant list Updating our background Updating our restaurant list cell Positioning elements in our restaurant list cell Adding auto layout to our restaurant list cell Creating our restaurant cell class Setting up restaurant list cell outlets Creating RestaurantDataManager Displaying data in Restaurant list cell Restaurant details Displaying data in the Restaurant Detail view Passing data to our Restaurant List View Controller Map update Challenge yourself Summary Saving Reviews What is Core Data?
Notifications Starting with the basics Getting permission Setting up notifications Showing notifications Customizing our notifications Embedding images Adding buttons Custom UI in notifications Summary ISBN www.
Why subscribe? Fully searchable across every book published by Packt Copy and paste, print, and bookmark content On demand and accessible via a web browser Customer Feedback Thank you for purchasing this Packt book. What this book covers Chapter 1, Getting Familiar with Xcode , will take us through a tour of Xcode and talk about all of the different panels we will use throughout the book.
What you need for this book You will need a computer that runs Xcode 8 or greater. Who this book is for This book is for beginners who want to be able to create iOS applications. Conventions In this book, you will find a number of text styles that distinguish between different kinds of information. Note Warnings or important notes appear in a box like this. Tip Tips and tricks appear like this. Reader feedback Feedback from our readers is always welcome. Customer support Now that you are the proud owner of a Packt book, we have a number of things to help you to get the most from your purchase.
You can download the code files by following these steps: Log in or register to our website using your e-mail address and password. Enterthe name of the book in the Search box. Select the book for which you're looking to download the code files. Choose from the drop-down menu where you purchased this book from. If you go to your asset library which is the item named Assets.
The asset library is the image asset library of your application. Whenever you need to add images to your app, you want to add it to this asset library. Not all the assets have to be used; think of this more like a repository of images that are available for use in your app. Start by right clicking on an empty area of the asset listing and choosing New Image Set. You can then rename it to anything you want.
As you can see in the image, there are three slots to add images: 1x, 2x and 3x. The 2x version is double the size of the 1x version and is used for Retina displays and the 3x version if the latest phones with the Retina Display HD like the iPhone X. This lets the system know that that is the retina version of the same image. Last of all, notice that the icon images are PNGs.