# ForEach A structure that computes views on demand from an underlying collection of identified data. ``` struct ForEach where Data : RandomAccessCollection, ID : Hashable ``` ## Overview Use `ForEach` to provide views based on a of some data type. Either the collection’s elements must conform to or you need to provide an `id` parameter to the `ForEach` initializer. The following example creates a `NamedFont` type that conforms to , and an array of this type called `namedFonts`. A `ForEach` instance iterates over the array, producing new [`Text`](/documentation/SwiftUI/Text) instances that display examples of each SwiftUI [`Font`](/documentation/SwiftUI/Font) style provided in the array. ``` private struct NamedFont: Identifiable { let name: String let font: Font var id: String { name } } private let namedFonts: [NamedFont] = [ NamedFont(name: "Large Title", font: .largeTitle), NamedFont(name: "Title", font: .title), NamedFont(name: "Headline", font: .headline), NamedFont(name: "Body", font: .body), NamedFont(name: "Caption", font: .caption) ] var body: some View { ForEach(namedFonts) { namedFont in Text(namedFont.name) .font(namedFont.font) } } ```  Some containers like [`List`](/documentation/SwiftUI/List) or [`LazyVStack`](/documentation/SwiftUI/LazyVStack) will query the elements within a for each lazily. To obtain maximal performance, ensure that the view created from each element in the collection represents a constant number of views. For example, the following view uses an if statement which means each element of the collection can represent either 1 or 0 views, a non-constant number. ``` ForEach(namedFonts) { namedFont in if namedFont.name.count != 2 { Text(namedFont.name) } } ``` You can make the above view represent a constant number of views by wrapping the condition in a [`VStack`](/documentation/SwiftUI/VStack), an [`HStack`](/documentation/SwiftUI/HStack), or a [`ZStack`](/documentation/SwiftUI/ZStack). ``` ForEach(namedFonts) { namedFont in VStack { if namedFont.name.count != 2 { Text(namedFont.name) } } } ``` When enabling the following launch argument, SwiftUI will log when it encounters a view that produces a non-constant number of views in these containers: ``` -LogForEachSlowPath YES ``` ## Topics ### Creating a collection [`init(_:)`](/documentation/SwiftUI/ForEach/init(_:)) Creates an instance that uniquely identifies and creates table rows across updates based on the identity of the underlying data. [`init(_:content:)`](/documentation/SwiftUI/ForEach/init(_:content:)) Creates an instance that uniquely identifies and creates map content across updates based on the identity of the underlying data. [`init(_:id:content:)`](/documentation/SwiftUI/ForEach/init(_:id:content:)) Creates an instance that uniquely identifies and creates map content across updates based on the provided key path to the underlying data’s identifier. [`init(sections:content:)`](/documentation/SwiftUI/ForEach/init(sections:content:)) Creates an instance that uniquely identifies and creates views across updates based on the sections of a given view. [`init(subviews:content:)`](/documentation/SwiftUI/ForEach/init(subviews:content:)) Creates an instance that uniquely identifies and creates views across updates based on the subviews of a given view. ### Creating an editable collection [`init(_:editActions:content:)`](/documentation/SwiftUI/ForEach/init(_:editActions:content:)) Creates an instance that uniquely identifies and creates views across updates based on the identity of the underlying data. [`init(_:id:editActions:content:)`](/documentation/SwiftUI/ForEach/init(_:id:editActions:content:)) Creates an instance that uniquely identifies and creates views across updates based on the identity of the underlying data. ### Accessing content [`content`](/documentation/SwiftUI/ForEach/content) A function to create content on demand using the underlying data. [`data`](/documentation/SwiftUI/ForEach/data) The collection of underlying identified data that SwiftUI uses to create views dynamically. --- 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)