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A common requirement when developing iOS apps is to store data in some form of structured database. One option is to directly manage data using an embedded database system such as SQLite. While this …

The previous chapter provided an introduction to the DocumentGroup scene type provided with SwiftUI and explored the architecture that makes it possible to add document browsing and management to …

The chapter entitled “SwiftUI Architecture” introduced the concept of SwiftUI scenes and explained that the SwiftUI framework, in addition to allowing you to build your own scenes, also includes two …

The SwiftUI ProgressView, as the name suggests, provides a way to visually indicate the progress of a task within an app. An app might, for example, need to display a progress bar while downloading a …

All Linux distributions are provided with a firewall solution of some form. In the case of Ubuntu this takes the form of the Uncomplicated Firewall outlined in the previous chapter. This chapter will …

In the previous chapter we looked at ports and services on an Ubuntu system. We also briefly looked at iptables firewall rules on Ubuntu including the creation of a few very simple rules from the …

A firewall is a vital component in protecting an individual computer system or network of computers from external attack (typically from an internet connection). Any computer connected directly to an …

It is difficult to envisage an Ubuntu system that does not have at least one network connection, and harder still to imagine how such an isolated system could be of much practical use. The simple fact …