<!--
{
  "availability" : [
    "iOS: 14.0.0 -",
    "iPadOS: 14.0.0 -",
    "macCatalyst: 14.0.0 -",
    "macOS: 11.0.0 -",
    "tvOS: 14.0.0 -",
    "visionOS: 1.0.0 -",
    "watchOS: 7.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "DeveloperToolsSupport",
  "identifier" : "/documentation/DeveloperToolsSupport/LibraryContentProvider/modifiers(base:)",
  "metadataVersion" : "0.1.0",
  "role" : "Instance Method",
  "symbol" : {
    "kind" : "Instance Method",
    "modules" : [
      "DeveloperToolsSupport"
    ],
    "preciseIdentifier" : "s:21DeveloperToolsSupport22LibraryContentProviderP9modifiers4baseSayAA0D4ItemVG12ModifierBaseQz_tF"
  },
  "title" : "modifiers(base:)"
}
-->

# modifiers(base:)

Indicates a collection of SwiftUI view modifiers to add to the Xcode
library.

```
@LibraryContentBuilder func modifiers(base: Self.ModifierBase) -> [LibraryItem]
```

## Parameters

`base`

An instance to apply modifiers to when declaring a library
item.

## Discussion

Xcode adds the [`LibraryItem`](/documentation/DeveloperToolsSupport/LibraryItem) instances returned
by your implementation of this method to its Modifiers library. The
following restrictions apply:

- You must instantiate the library items inline.
- If specified, the item’s `title`, `category`, and `matchingSignature`
  must be static strings and not `nil`.
- The item’s `visible` value, if specified, must be a literal Boolean
  value.
- The item’s expression must be a reference expression where the root
  reference is `base` and the expression contains at least one
  modifier, like `base.opacity(0.5)`.

---

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)