<!--
{
  "availability" : [
    "iOS: 13.0.0 -",
    "iPadOS: 13.0.0 -",
    "macCatalyst: 13.0.0 -",
    "macOS: 10.15.0 -",
    "tvOS: 13.0.0 -",
    "visionOS: 1.0.0 -",
    "watchOS: 6.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "SwiftUI",
  "identifier" : "/documentation/SwiftUI/EnvironmentalModifier",
  "metadataVersion" : "0.1.0",
  "role" : "Protocol",
  "symbol" : {
    "kind" : "Protocol",
    "modules" : [
      "SwiftUI"
    ],
    "preciseIdentifier" : "s:7SwiftUI21EnvironmentalModifierP"
  },
  "title" : "EnvironmentalModifier"
}
-->

# EnvironmentalModifier

A modifier that must resolve to a concrete modifier in an environment before
use.

```
protocol EnvironmentalModifier : ViewModifier where Self.Body == Never
```

## Topics

### Resolving a modifier

[`resolve(in:)`](/documentation/SwiftUI/EnvironmentalModifier/resolve(in:))

Resolve to a concrete modifier in the given `environment`.

[`ResolvedModifier`](/documentation/SwiftUI/EnvironmentalModifier/ResolvedModifier)

The type of modifier to use after being resolved.


---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)