# init(_:unlabeledChildren:displayStyle:ancestorRepresentation:) Creates a mirror representing the given subject with unlabeled children. ``` init(_ subject: Subject, unlabeledChildren: C, displayStyle: Mirror.DisplayStyle? = nil, ancestorRepresentation: Mirror.AncestorRepresentation = .generated) where C : Collection ``` ## Parameters `subject` The instance to represent in the new mirror. `unlabeledChildren` The children to use for the mirror. The collection traversal modeled by `unlabeledChildren` is captured so that the resulting mirror’s children may be upgraded to a bidirectional or random access collection later. See the `children` property for details. `displayStyle` The preferred display style for the mirror when presented in the debugger or in a playground. The default is `nil`. `ancestorRepresentation` The means of generating the subject’s ancestor representation. `ancestorRepresentation` is ignored if `subject` is not a class instance. The default is `.generated`. ## Discussion You use this initializer from within your type’s `customMirror` implementation to create a customized mirror, particularly for custom types that are collections. The labels of the resulting mirror’s `children` collection are all `nil`. If `subject` is a class instance, `ancestorRepresentation` determines whether ancestor classes will be represented and whether their `customMirror` implementations will be used. By default, the `customMirror` implementation of any ancestors is ignored. To prevent bypassing customized ancestors, pass `.customized({ super.customMirror })` as the `ancestorRepresentation` parameter when implementing your type’s `customMirror` property. --- Copyright © 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)