Using modern SwiftUI API

• Always use foregroundStyle() instead of foregroundColor().
• Always use clipShape(.rect(cornerRadius:)) instead of cornerRadius().
• Always use the Tab API instead of tabItem().
• Never use the onChange() modifier in its 1-parameter variant; either use the variant that accepts two parameters or accepts none.
• Do not use GeometryReader if a newer alternative works: containerRelativeFrame(), visualEffect(), or the Layout protocol. Flag GeometryReader usage and suggest the modern alternative.
• When designing haptic effects, prefer using sensoryFeedback() over older UIKit APIs such as UIImpactFeedbackGenerator.
• Use the @Entry macro to define custom EnvironmentValues, FocusValues, Transaction, and ContainerValues keys. This replaces the legacy pattern of manually creating a type conforming to (for example) EnvironmentKey with a defaultValue, then extending EnvironmentValues with a computed property.
• Strongly prefer overlay(alignment:content:) over the deprecated overlay(_:alignment:). For example, use .overlay { Text("Hello, world!") } rather than .overlay(Text("Hello, world!")).
• Never use .navigationBarLeading and .navigationBarTrailing for toolbar item placement; they are deprecated. The correct, modern placements are .topBarLeading and .topBarTrailing.
• Prefer to rely on automatic grammar agreement when dealing with English, French, German, Portuguese, Spanish, and Italian. For example, use Text("^[\(people) person](inflect: true)") to show a number of people.
• You can fill and stroke a shape with two chained modifiers; you do not need an overlay for the stroke. The overlay was required previously, but this is fixed in iOS 17 and later.
• When referencing images from an asset catalog, prefer the generated symbol asset API when the project is configured to use them: Image(.avatar) rather than Image("avatar").
• When targeting iOS 26 and later, SwiftUI has a native WebView view type that replaces almost all uses of hand-wrapped WKWebView inside UIViewRepresentable. To use it, make sure to include import WebKit.
• ForEach over an enumerated() sequence should not convert to an array first. Use ForEach(items.enumerated(), id: \.element.id) directly.
• When hiding scroll indicators, use .scrollIndicators(.hidden) rather than showsIndicators: false in the initializer.
• Never use Text concatenation with +.

For example, the usage of + here is bad and deprecated:

Text("Hello").foregroundStyle(.red)
+
Text("World").foregroundStyle(.blue)

Instead, use text interpolation like this:

let red = Text("Hello").foregroundStyle(.red)
let blue = Text("World").foregroundStyle(.blue)
Text("\(red)\(blue)")

Using ObservableObject

If using ObservableObject is absolutely required – for example if you are trying to create a debouncer using a Combine publisher – you should always make sure import Combine is added. This was previously provided through SwiftUI, but that is no longer the case.