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  • Save an image to MacOS file system with SwiftUI

    May 22, 2022 · 7 min read · NSSavePanel image file macos swiftui  ·
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    Save an image to MacOS file system with SwiftUI

    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 …

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  • Map on collections in Swift

    May 15, 2022 · 5 min read · map mapValues flatmap compactmap  ·
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    Map on collections in Swift

    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.

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  • Iterating over a Dictionary in Swift

    May 8, 2022 · 10 min read · dictionary enumerate iterate  ·
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    Iterating over a Dictionary in Swift

    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.

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  • Exploring data with Swift TabularData and DataFrame

    May 1, 2022 · 13 min read · tabular data dataframe covid swift  ·
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    Exploring data with Swift TabularData and DataFrame

    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, …

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  • Use Dependency Injection to Unit Test a ViewModel in Swift

    Apr 17, 2022 · 8 min read · dependency injection di unit test swiftui  ·
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    Use Dependency Injection to Unit Test a ViewModel in Swift

    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 …

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  • Consistent Swift style in Xcode with SwiftLint

    Mar 27, 2022 · 26 min read · swiftlint style swiftui  ·
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    Consistent Swift style in Xcode with SwiftLint

    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 …

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Eric Callanan

Lifelong learner, Software Engineering Manager, Passionate, Curious
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Recent Posts

  • Save an image to MacOS file system with SwiftUI
  • Map on collections in Swift
  • Iterating over a Dictionary in Swift
  • Exploring data with Swift TabularData and DataFrame
  • Use Dependency Injection to Unit Test a ViewModel in Swift
  • Consistent Swift style in Xcode with SwiftLint
  • Display loading screen when fetching data in Swift
  • Read JSON with codeable in Swift

Tags

SWIFTUI 58 PYTHON 27 SWIFT 13 PATH 12 PANDAS 11 MVVM 8 MATPLOTLIB 7 PLOTLY 7 ANIMATION 6 BAR-CHART 6 CANVAS 6 COVID-19 5 SHAPE 5 TIC-TAC-TOE 5
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2D2 3D2 ACTIVITY-RING1 ADDCURVE1 ALGORITHM1 ANGULARGRADIENT1 ANIMATABLEDATA4 ANIMATION6 ASYNC1 AWAIT1 AXIS2 BAR-CHART6 BUTTON1 BUTTONSTYLE1 CANVAS6 CARD1 CHART1 COMPACTMAP1 CONCAT1 COVID2 COVID-195 CROSS-PRODUCT1 DATAFRAME2 DEPENDENCY-INJECTION1 DI1 DICTIONARY1 DIVISION1 DOT-PRODUCT1 ENUMERATE1 FIBONACCI1 FILE1 FILTER1 FLATMAP1 FLIP1 FLOOR1 FOREACH1 FORM1 GEOMETRYREADER1 GEOPANDAS1 GEOPLOT1 HSTACK1 ILOC1 IMAGE2 INDEX1 IPYWIDGETS1 ITERATE1 JSON1 JSONDECODER1 LINE-CHART1 LIST1 LOC1 LOOP1 MACOS1 MAP1 MAPVALUES1 MATHPLOTLIB4 MATPLOTLIB7 MINIMAX3 MODAL1 MONTY-HALL3 MVVM8 NAVIGATION1 NSSAVEPANEL1 PANDAS11 PATH12 PERFORMANCE2 PHOTO1 PIE-CHART1 PLOTLY7 POLYGON1 PROBABILITY3 PROGRESS1 PROGRESSVIEW1 PUZZLE1 PYTHON27 QR-CODE1 RECURSION1 ROMAN-NUMERALS1 SHADING1 SHAPE5 SLIDER1 SPEED1 STAR3 STYLE1 SWIFT13 SWIFTLINT1 SWIFTUI58 TABULAR-DATA1 TABVIEW1 TDD4 TEXT2 TIC-TAC-TOE5 TIMELINEVIEW4 TIMING1 UI-TESTING1 UNIT-TEST1 UNIT-TESTING1 USERDEFAULTS1 VECTOR4 VECTORARITHMETIC4 VSTACK1 WHERE1 ZIP1 ZSTACK1
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