# Measurement.AttributedStyle.ByteCount A format style that converts byte counts into attributed strings. ``` struct ByteCount ``` ## Overview Use the [`attributed`](/documentation/Foundation/Measurement/FormatStyle/ByteCount/attributed) modifier on a [`Measurement.FormatStyle.ByteCount`](/documentation/Foundation/Measurement/FormatStyle/ByteCount) instance to create a format style of this type. The attributed strings that this fomat style creates contain attributes from the [`AttributeScopes.FoundationAttributes.NumberFormatAttributes`](/documentation/Foundation/AttributeScopes/FoundationAttributes/NumberFormatAttributes) attribute scope. Use these attributes to determine which runs of the attributed string represent different parts of the formatted value. ## Topics ### Creating an attributed byte count format style [`init(style: Measurement.AttributedStyle.ByteCount.Style, allowedUnits: Measurement.AttributedStyle.ByteCount.Units, spellsOutZero: Bool, includesActualByteCount: Bool, locale: Locale)`](/documentation/Foundation/Measurement/AttributedStyle/ByteCount/init(style:allowedUnits:spellsOutZero:includesActualByteCount:locale:)) Initializes an attributed byte count format style. ### Formatting a byte count [`func format(Measurement) -> AttributedString`](/documentation/Foundation/Measurement/AttributedStyle/ByteCount/format(_:)) Formats a byte count measurment, using this style. ### Accessing style properties [`var allowedUnits: Measurement.AttributedStyle.ByteCount.Units`](/documentation/Foundation/Measurement/AttributedStyle/ByteCount/allowedUnits) The units the format style can use to express the byte count. [`typealias Units`](/documentation/Foundation/Measurement/AttributedStyle/ByteCount/Units) The type the measurement format style uses to represent byte-counting units. [`var spellsOutZero: Bool`](/documentation/Foundation/Measurement/AttributedStyle/ByteCount/spellsOutZero) A Boolean value that indicates whether the format style should spell out zero-byte values as text. [`var includesActualByteCount: Bool`](/documentation/Foundation/Measurement/AttributedStyle/ByteCount/includesActualByteCount) A Boolean value that indicates whether the format style should include the exact byte count, in addition to expressing it in terms of units. [`var style: Measurement.AttributedStyle.ByteCount.Style`](/documentation/Foundation/Measurement/AttributedStyle/ByteCount/style-swift.property) The style of byte count to express, such as memory or file system storage. [`typealias Style`](/documentation/Foundation/Measurement/AttributedStyle/ByteCount/Style-swift.typealias) The type used to represent the style of the formatted byte count. [`var locale: Locale`](/documentation/Foundation/Measurement/AttributedStyle/ByteCount/locale) The locale to use to format the numeric part of the byte count. ### Modifying style locale [`func locale(Locale) -> Measurement.AttributedStyle.ByteCount`](/documentation/Foundation/Measurement/AttributedStyle/ByteCount/locale(_:)) Modifies the format style to use the specified locale. ### Applying currency styles ### Applying measurement styles ### Applying list styles ### Supporting types ## Relationships ### Conforms To [`Hashable`](/documentation/Swift/Hashable) [`FormatStyle`](/documentation/Foundation/FormatStyle) [`Equatable`](/documentation/Swift/Equatable) [`Encodable`](/documentation/Swift/Encodable) [`Sendable`](/documentation/Swift/Sendable) [`SendableMetatype`](/documentation/Swift/SendableMetatype) [`Decodable`](/documentation/Swift/Decodable) --- 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)