TableColumnForEach

struct · iOS 17.4+ · SDK 27.1

nonisolated struct TableColumnForEach<Data, ID, RowValue, Sort, Content> where Data : RandomAccessCollection, ID : Hashable, RowValue == Content.TableRowValue, Sort == Content.TableColumnSortComparator, Content : TableColumnContent

A structure that computes columns on demand from an underlying collection of identified data. Use `TableColumnForEach` to create columns based on a <doc://com.apple.documentation/documentation/Swift/RandomAccessCollection> of some data type. Either the collection's elements must conform to <doc://com.apple.documentation/documentation/Swift/Identifiable> or you need to provide an `id` parameter to the `TableColumnForEach` initializer. The following example shows the interface for an `AudioSampleTrack`, which h as a collection of `AudioSample` across a dynamic number of `AudioChannel`s. The `Table` is created for displaying rows for each sample. It has one static column for the sample's timestamp and uses a `TableColumnForEach` instance to produce a column for each of the audio channels in the track. struct AudioChannel: Identifiable { let name: String let id: UUID } struct AudioSample: Identifiable { let id: UUID let timestamp: TimeInterval func level(channel: AudioChannel.ID) -> Double } @Observable class AudioSampleTrack { let channels: [AudioChannel] var samples: some RandomAccessCollection<AudioSample> { get } } struct ContentView: View { var track: AudioSampleTrack var body: some View { Table(track.samples) { TableColumn("Timestamp (ms)") { sample in Text(sample.timestamp, format: .number.scale(1000)) .monospacedDigit() } TableColumnForEach(track.channels) { channel in TableColumn(channel.name) { sample in Text(sample.level(channel: channel.id), format: .number.precision(.fractionLength(2)) ) .monospacedDigit() } .width(ideal: 70) .alignment(.numeric) } } } }

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