-
SwiftUI does not have a control to present an open/save dialog to the user to allow saving files to the macOS filesystem. One could build such a view from scratch, but it is easier to use NSSavePanel from AppKit. This article demonstrates how to use NSSavePanel to get the URL for the file to be saved and use …
Read More -
Swift provides a number of map methods to transform elements in Swift collections and return the transformed data in a new Array. The transform is supplied in a trailing closure to the map function. This article looks at Map, FlatMap and CompactMap on collections in Swift as well as MapValues in Dictionary.
Read More -
A dictionary stores a list of key/value pairs in an unordered structure that is fast and efficient at adding elements and finding elements by a key. Each element in the dictionary is identified using its key, which is a hashable type such as a string or number.
Read More -
TabularData was introduced in iOS 15 and can be used to load data from csv or json format into a DataFrame to explore and manipulate. This is not Python Pandas, but it does provide some basic functionality for exploring data and is fast and efficient. In this article, the data on the deaths from Covid is loaded, …
Read More -
Dependency Injection is a technique to pass in one or more dependent object to another object. This article will build on the Weather App to pass in the weather service to the weather ViewModel at initialisation. This will allow the use of a mock weather service to test the ViewModel in unit tests without requiring any …
Read More -
Code style can be a controversial topic and lead to some passionate debates between developers. The use of a tool to enforce a set of rules on style can be very helpful to avoid contentious arguments and ensure the code is consistent throughout a project. SwiftLint can easily be incorporated into Xcode projects to flag …
Read More