One thing that bothers many developers about using if statements for type checking in Objective-C is that it suggests a specific order of importance. For example, here's how you might use type checking in an Objective-C `prepareForSegue` method. This Swift version is much more concise, but we still have . . .
In Part 1 of this tutorial, I explained how to use the Alamofire and AlamofireImage libraries to asynchronously download and cache images to be displayed in a UICollectionView. At the end of that project, we still had a performance problem. UIImage by default waits until right before display to decode . . .
Downloading and caching images are common tasks in iOS development, especially when using collection and table views. In this tutorial, we're going to use the popular Swift networking library Alamofire and its companion image library AlamofireImage to build an app that displays images of Glacier National Park.
In Part 3 we started working with a `Park` model and defined two endpoints that returned information about parks. We used an in-memory array to hold `Park` instances. In this tutorial we'll set up a PostgreSQL database . . .
In Part 2 we explored the basic structure of a Vapor app. Next we'll look at how to declare simple routes with dynamic path components and query parameters. Our API will model information about U.S. national parks, so we'll start by declaring a simple `Park` model. For now, we'll keep an array of parks in memory and define two routes.