# init(lengthLimits:roundingRule:roundingIncrement:) Creates a fractional part display strategy that uses the provided behaviors. ``` init(lengthLimits: Range, roundingRule: FloatingPointRoundingRule = .toNearestOrEven, roundingIncrement: Double? = nil) where Range : RangeExpression, Range.Bound == Int ``` ## Parameters `lengthLimits` The maximum string length of the fractional part. `roundingRule` A rule for rounding fractional values up or down. Defaults to [`FloatingPointRoundingRule.toNearestOrEven`](/documentation/Swift/FloatingPointRoundingRule/toNearestOrEven). `roundingIncrement` A multiple by which the formatter rounds the fractional part. The formatter produces a value that is an even multiple of this increment. If this parameter is `nil` (the default), the formatter doesn’t apply an increment. This value is only meaningful when the combination of allowed units, rounding rule, and formatting strategy requires expressing a unit with a fractional part. For example, a formatter that only allows minutes and uses a strategy with a length of `2` and default rounding rule formats 40 seconds as `0.67 minutes`. With a `roundingIncrement` of `0.05`, the formatter formats this value as `0.65 minutes` instead. --- 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)