Swift Package Index


CSV reading and writing library written in Swift.


  • The latest stable release is 2.4.3. Released 10 months ago.
  • The last commit to master was 10 months ago.

Swift Version Compatibility

  • 2.4.3 and master
    5.3
    5.2
    5.1
    5.0
    4.2
Full build results

Platform Compatibility

  • 2.4.3 and master
    iOS
    macOS(Intel)
    macOS(ARM)
    Linux
    tvOS
    watchOS
Full build results

CSV.swift

Build Status codecov Open Source Helpers

CSV reading and writing library written in Swift.

Usage for reading CSV

From string

import CSV

let csvString = "1,foo\n2,bar"
let csv = try! CSVReader(string: csvString)
while let row = csv.next() {
    print("\(row)")
}
// => ["1", "foo"]
// => ["2", "bar"]

From file

NOTE: The default character encoding is UTF8.

import Foundation
import CSV

let stream = InputStream(fileAtPath: "/path/to/file.csv")!
let csv = try! CSVReader(stream: stream)
while let row = csv.next() {
    print("\(row)")
}

Getting the header row

import CSV

let csvString = "id,name\n1,foo\n2,bar"
let csv = try! CSVReader(string: csvString,
                         hasHeaderRow: true) // It must be true.

let headerRow = csv.headerRow!
print("\(headerRow)") // => ["id", "name"]

while let row = csv.next() {
    print("\(row)")
}
// => ["1", "foo"]
// => ["2", "bar"]

Get the field value using subscript

import CSV

let csvString = "id,name\n1,foo"
let csv = try! CSVReader(string: csvString,
                         hasHeaderRow: true) // It must be true.

while csv.next() != nil {
    print("\(csv["id"]!)")   // => "1"
    print("\(csv["name"]!)") // => "foo"
}

Provide the character encoding

If you use a file path, you can provide the character encoding to initializer.

import Foundation
import CSV

let stream = InputStream(fileAtPath: "/path/to/file.csv")!
let csv = try! CSVReader(stream: stream,
                         codecType: UTF16.self,
                         endian: .big)

Reading a row into a Decodable object

If you have a destination object that conforms to the Decodable protocol, you can serialize a row with a new instances of the object.

struct DecodableExample: Decodable {
    let intKey: Int
    let stringKey: String
    let optionalStringKey: String?
}

let csv = """
    intKey,stringKey,optionalStringKey
    1234,abcd,
    """

var records = [DecodableExample]()
do {
    let reader = try CSVReader(string: csv, hasHeaderRow: true)
    let decoder = CSVRowDecoder()
    while reader.next() != nil {
        let row = try decoder.decode(DecodableExample.self, from: reader)
        records.append(row)
    }
} catch {
    // Invalid row format
}

Usage for writing CSV

Write to memory and get a CSV String

NOTE: The default character encoding is UTF8.

import Foundation
import CSV

let csv = try! CSVWriter(stream: .toMemory())

// Write a row
try! csv.write(row: ["id", "name"])

// Write fields separately
csv.beginNewRow()
try! csv.write(field: "1")
try! csv.write(field: "foo")
csv.beginNewRow()
try! csv.write(field: "2")
try! csv.write(field: "bar")

csv.stream.close()

// Get a String
let csvData = csv.stream.property(forKey: .dataWrittenToMemoryStreamKey) as! Data
let csvString = String(data: csvData, encoding: .utf8)!
print(csvString)
// => "id,name\n1,foo\n2,bar"

Write to file

NOTE: The default character encoding is UTF8.

import Foundation
import CSV

let stream = OutputStream(toFileAtPath: "/path/to/file.csv", append: false)!
let csv = try! CSVWriter(stream: stream)

try! csv.write(row: ["id", "name"])
try! csv.write(row: ["1", "foo"])
try! csv.write(row: ["1", "bar"])

csv.stream.close()

Installation

CocoaPods

pod 'CSV.swift', '~> 2.4.3'

Carthage

github "yaslab/CSV.swift" ~> 2.4.3

Swift Package Manager

.package(url: "https://github.com/yaslab/CSV.swift.git", .upToNextMinor(from: "2.4.3"))

Reference specification

License

CSV.swift is released under the MIT license. See the LICENSE file for more info.