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# init(_:)

Creates a custom vertical alignment of the specified type.

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

## Parameters

`id`

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

## Discussion

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

```
private struct FirstThirdAlignment: AlignmentID {
    static func defaultValue(in context: ViewDimensions) -> CGFloat {
        context.height / 3
    }
}

extension VerticalAlignment {
    static let firstThird = VerticalAlignment(FirstThirdAlignment.self)
}
```

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

---

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