Meet Buzzy, a sweet new game you’re developing! Buzzy is an intrepid worker bee looking for pollen-filled flowers, and she needs the player’s help to find them. Note: This intermediate-level tutorial assumes you’re comfortable using SwiftUI and that you have previously built an iOS app using Xcode and Swift. Encapsulate a dynamic overlay into a custom view modifier.Create a dynamic view overlay which updates with your main view automatically.Use that information to position views from separate parts of the hierarchy relative to each other.Report layout information from child views to ancestors.In this tutorial, you’ll learn how to use view preferences to achieve the following: But view preferences are the solution to sending data the “wrong” way in SwiftUI. At first glance, it’s an oddly named, sparsely documented and easily dismissed part of the framework. Instead, there are SwiftUI view preferences.

There’s no responder chain, delegates or superview referencing in SwiftUI like there is in UIKit. Now and then, however, it’s really useful for an ancestor view to get some information back in the opposite direction. Relevant information flows from the root view down to the descendant views a list knows about all of the entries it contains, but a single cell only knows about one entry, and the name label in that cell only knows about a single piece of text.

You write a view, which contains other views, which contains further views, and so on. Much has been said about the declarative, top-down nature of SwiftUI.

Creating a minimap model szs modifier