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Software Development

Building Context Menus in SwiftUI

Building Context Menus in SwiftUI

A context menu in SwiftUI is a menu of options that appears when the user performs a long press over a view on which a menu has been configured. Each menu item will typically contain a Button view …
Building Tabbed Views in SwiftUI

Building Tabbed Views in SwiftUI

The SwiftUI TabView component allows the user to navigate between different child views either by selecting tab items located in a tab bar or, when using the page view tab style, by making swiping …
A SwiftUI List, OutlineGroup and DisclosureGroup Tutorial

A SwiftUI List, OutlineGroup and DisclosureGroup Tutorial

The previous chapter covered the List, OutlineGroup and DisclosureGroup views and explored how these can be used to visually present hierarchical information within an app while allowing the user to …
An Overview of SwiftUI List, OutlineGroup and DisclosureGroup

An Overview of SwiftUI List, OutlineGroup and DisclosureGroup

The preceding chapters explored the use of the SwiftUI List view to display information to users in an ordered manner. Lists provide a way to present large amounts of information to the user in a …

Operating Systems

Basic Ubuntu 20.04 Firewall Configuration with firewalld

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 …

Using gufw and ufw to Configure an Ubuntu 20.04 Firewall

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 …

Ubuntu 20.04 Firewall Basics

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 …

Ubuntu 20.04 Network Management

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 …

Indepth Guides