swift 3.1 how to get array or dictionary from CSV - csv

Question

How could I use data in this kind of CSV file? Or how could I print for example row 2 value for "inside" column and assign it to a property / entity?
I have this kind of file I got from excel file converted to Numbers, I'd like to grab data for each column and use them.
The original CSV file opened in numbers:
The console output I got:
Using this methods:
func readDataFromCSV(fileName:String, fileType: String)-> String!{
guard let filepath = Bundle.main.path(forResource: fileName, ofType: fileType)
else {
return nil
}
do {
var contents = try String(contentsOfFile: filepath, encoding: .utf8)
contents = cleanRows(file: contents)
return contents
} catch {
print("File Read Error for file \(filepath)")
return nil
}
}
func cleanRows(file:String)->String{
var cleanFile = file
cleanFile = cleanFile.replacingOccurrences(of: "\r", with: "\n")
cleanFile = cleanFile.replacingOccurrences(of: "\n\n", with: "\n")
// cleanFile = cleanFile.replacingOccurrences(of: ";;", with: "")
// cleanFile = cleanFile.replacingOccurrences(of: ";\n", with: "")
return cleanFile
}
SOLUTION thanks to Jens Meder
using
func csv(data: String) -> [[String]] {
var result: [[String]] = []
let rows = data.components(separatedBy: "\n")
for row in rows {
let columns = row.components(separatedBy: ";")
result.append(columns)
}
return result
}
in viewDidLoad
var data = readDataFromCSV(fileName: kCSVFileName, fileType: kCSVFileExtension)
data = cleanRows(file: data!)
let csvRows = csv(data: data!)
print(csvRows[1][1]) // UXM n. 166/167

Answer 1

What you want to do is splitting up the string in rows and then into columns (basically a two dimensional array of Strings). Swift already provides the components method for that on String structs.
func csv(data: String) -> [[String]] {
var result: [[String]] = []
let rows = data.components(separatedBy: "\n")
for row in rows {
let columns = row.components(separatedBy: ";")
result.append(columns)
}
return result
}
Then you can access any value via:
var data = readDataFromCSV(fileName: kCSVFileName, fileType: kCSVFileExtension)
data = cleanRows(file: data)
let csvRows = csv(data: data)
print(csvRows[1][1]) //UXM n. 166/167.

Answer 2

Swift 4
Sometime CSV file is more complicated such as special characters (e.g. comma), the values are surrounded by double quotes as examples below:
Hello, "Complicated String, with a comma inside", 123
In this case, I use:
let dataString: String! = String.init(data: data!, encoding: .utf8)
var items: [(String, String, String)] = []
let lines: [String] = dataString.components(separatedBy: NSCharacterSet.newlines) as [String]
for line in lines {
var values: [String] = []
if line != "" {
if line.range(of: "\"") != nil {
var textToScan:String = line
var value:NSString?
var textScanner:Scanner = Scanner(string: textToScan)
while textScanner.string != "" {
if (textScanner.string as NSString).substring(to: 1) == "\"" {
textScanner.scanLocation += 1
textScanner.scanUpTo("\"", into: &value)
textScanner.scanLocation += 1
} else {
textScanner.scanUpTo(",", into: &value)
}
values.append(value! as String)
if textScanner.scanLocation < textScanner.string.count {
textToScan = (textScanner.string as NSString).substring(from: textScanner.scanLocation + 1)
} else {
textToScan = ""
}
textScanner = Scanner(string: textToScan)
}
// For a line without double quotes, we can simply separate the string
// by using the delimiter (e.g. comma)
} else {
values = line.components(separatedBy: ",")
}
// Put the values into the tuple and add it to the items array
let item = (values[0], values[1], values[2])
items.append(item)
print(item.1)
print(item.2)
print(item.3)
}
}
It is just written in Swift 4, the original is from https://www.appcoda.com/core-data-preload-sqlite-database/

Answer 3

Starting from iOS15 there is a new Official framework called TabularData, try to use it.
import TabularData
let url = Bundle.main.url(forResource: "csvFileName", withExtension: "csv")!
let result = try? DataFrame(contentsOfCSVFile: url)
print(result)
Then you can convert them into the data model you need
More Detail About TabularData(WWDC)

Answer 4

Swift 5.0
.scanLocaion and .scanUpTo() were deprecated in iOS13. Here's a working version of Chhaileng's answer.
func openCSV(fileName:String, fileType: String)-> String!{
guard let filepath = Bundle.main.path(forResource: fileName, ofType: fileType)
else {
return nil
}
do {
let contents = try String(contentsOfFile: filepath, encoding: .utf8)
return contents
} catch {
print("File Read Error for file \(filepath)")
return nil
}
}
func parseCSV(){
let dataString: String! = openCSV(fileName: "MeislinDemo", fileType: "csv")
var items: [(String, String, String)] = []
let lines: [String] = dataString.components(separatedBy: NSCharacterSet.newlines) as [String]
for line in lines {
var values: [String] = []
if line != "" {
if line.range(of: "\"") != nil {
var textToScan:String = line
var value:String?
var textScanner:Scanner = Scanner(string: textToScan)
while !textScanner.isAtEnd {
if (textScanner.string as NSString).substring(to: 1) == "\"" {
textScanner.currentIndex = textScanner.string.index(after: textScanner.currentIndex)
value = textScanner.scanUpToString("\"")
textScanner.currentIndex = textScanner.string.index(after: textScanner.currentIndex)
} else {
value = textScanner.scanUpToString(",")
}
values.append(value! as String)
if !textScanner.isAtEnd{
let indexPlusOne = textScanner.string.index(after: textScanner.currentIndex)
textToScan = String(textScanner.string[indexPlusOne...])
} else {
textToScan = ""
}
textScanner = Scanner(string: textToScan)
}
// For a line without double quotes, we can simply separate the string
// by using the delimiter (e.g. comma)
} else {
values = line.components(separatedBy: ",")
}
// Put the values into the tuple and add it to the items array
let item = (values[0], values[1], values[2])
items.append(item)
print(item.0)
print(item.1)
print(item.2)
}
}
}

Answer 5


This is for CSV file for swift 4.2
var dataArray = [[String]]()
if let path = Bundle.main.path(forResource: "file", ofType: "csv") {
dataArray = []
let url = URL(fileURLWithPath: path)
do {
let data = try Data(contentsOf: url)
let dataEncoded = String(data: data, encoding: .utf8)
if let dataArr = dataEncoded?.components(separatedBy: "\r\n").map({ $0.components(separatedBy: ";") }) {
for line in dataArr {
dataArray.append(line)
}
}
} catch let jsonErr {
print("\n Error reading CSV file: \n ", jsonErr)
}
}