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# init(_:)

Creates a custom horizontal alignment of the specified type.

```
init(_ id: any AlignmentID.Type)
```

## Parameters

`id`

The type of an identifier that uniquely identifies a
horizontal alignment.

## Discussion

Use this initializer to create a custom horizontal alignment. Define
an [`AlignmentID`](/documentation/SwiftUI/AlignmentID) type, and then use that type to create a new
static property on [`HorizontalAlignment`](/documentation/SwiftUI/HorizontalAlignment):

```
private struct OneQuarterAlignment: AlignmentID {
    static func defaultValue(in context: ViewDimensions) -> CGFloat {
        context.width / 4
    }
}

extension HorizontalAlignment {
    static let oneQuarter = HorizontalAlignment(OneQuarterAlignment.self)
}
```

Every horizontal alignment instance that you create needs a unique
identifier. For more information, see [`AlignmentID`](/documentation/SwiftUI/AlignmentID).

---

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