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TempAtlas in SwiftUI

TemperatureAtlas uses Apple Maps combined with the OpenWeather API written in SwiftUI.

This project was built to explore SwiftUI beyond the WWDC talks and current documentation


Build Info


  • Xcode 11 beta 2
  • iOS 13.0
  • SwiftUI

Project Details


The app allows the user to view live weather information by either searching for cities supported by the API in the search field or by tapping anywhere on the map. The User can save favorite locations to easily view those forecasts at a later time. Weather information can be toggled between Imperial and Metric units.

Project Structure


Models

The data model for the app is WeatherState. This ObservedObject is used in most views in the app and contains information like the current active units, the current JSON response from the API, the current focused coordinates, the active Favorites, and a boolean flag for when the JSON response isn't nil. The model has some helper functions to handle adding/removing favorites from the local collection as well as saving and loading this information to/from UserDefaults. The file contains the Favorite struct to contain the name and coordinates of a favorite location.

API

The API Group contains the logic for requesting weather data and the struct for capturing the response. WeatherAPI contains the functions to request forecast data from OpenWeater by city and by coordinate. This makes a basic URLSession.shared.dataTask from a URLRequest and calls a completion handler with a flag based on if the call was a success and the response data.

The WeatherResponse file contains all the Codable structs used to decode the API response. One of these structs, Coordinate, has some helper functions to compare two Coordinates and also to convert it to a CLLocationCoordinate2D. This file also extends CLLocationCoordinate2D to add similar functions, one a comparator and the other to convert to a Coordinate.

Landing and Forecast Views

The App is contained in the Landing.swift file. This displays the SearchBar, MapView, ControlsView, and InfoView immediately. These files are part of the Forecast Views Group. The InfoRow View in this group is a building block of the InfoView. Each of these views contains relevant styling and most contain a reference to the app's data model WeatherState either through a @Binding or @EnvironmentObject reference

Modal Views

The Landing View presents a Modal which displays the user's favorites. The ForecastList and FavoriteRow that makes up each cell in the list are contained in the Modal Views Group. The Modal takes the WeatherState Environment Object to make changes to the map when the user selects one of their favorites. It also takes a boolean @Binding to let the Landing page know to dismiss the Modal once it's called to update the map location and forecast information.

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Apple Maps combined with the OpenWeather API written in SwiftUI

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