Alamofire is an HTTP network-based library which is used to handle the web request and response in iOS and MacOS. It is the wrapper class of URLSession and provides an interface on the top of Apple's networking stack. It simplifies the common networking tasks like preparing HTTP requests and parse the JSON object.
The main advantage of Alamofire is that it is written entirely in swift and does not inherit anything from the AFNetworking library used for networking calls in objective C.
It provides the request and response methods, JSON parameter and response serialization, authentication, and many other features. Since Alamofire simplifies the HTTP networking calls in iOS projects. Before Alamofire, we were used to preparing all the requests by ourselves only. The multipart request and response were also a complicated process, including file uploading and downloading.
In this section of the tutorial, we will discuss the working and uses of the widely used networking library, Alamofire. We will set up a project and see how we can use Alamofire in it.
Setting up Alamofire in the iOS project
Alamofire can be installed in the project using Cocoapods or Carthage. Since we have used Cocoapods in this tutorial, we will stick to cocoapods for the installation. Alamofire project can be found on GitHub as https://github.com/Alamofire/Alamofire, where we can find the documentation regarding its installation.
However, let's create a new project for network calls and name it as AlamoDemo. Here, we are saving it inside a folder named Alamofire on desktop.
After creating the project, open the terminal and change the directory to the project directory by the following command.
Initialize the Podfile by the following command.
Now, in the Podfile, add the following line to install the pods for Alamofire.
Now run the following command to install the pods, and after successful install, open the project xcworkspace file.
Basic network terminologies
In this tutorial, we have not discussed the basic network terminologies like HTTP, JSON, and REST APIs, which we are going to use in this section of the tutorial. However, this will provide you some exposure regarding the common network terminologies.
HTTP stands for Hypertext Transfer Protocol that is an application protocol or set of rules. It governs the data transfer over the internet. HTTP provides the set of rules that every website follows to transfer the data from the webserver to the client's web browser. Every URL on the internet is prefixed with HTTP of HTTPS. There are other application protocols, such as FTP, Telnet, and SSH. There are the following request methods defined by HTTP that is used by the client to indicate the action.
REST stands for REpresentational State Transfer that defines a set of rules to design consistent and easy-to-use Web APIs. It defines some architecture rules that persist the states across the web requests that make the request cacheable and provide uniform access. As the Application developer, we do not need to track the state of data across the requests while integrating the REST APIs into the Application.