Write String Value Into a File in Swift

In this short Swift code example, you will learn how to:

  • Find a Documents directory on iOS device in Swift,
  • Write a String value into a file in the Documents directory on an iOS device.
let fileName = "myFileName.txt"
var filePath = ""

// Fine documents directory on device
let dirs:[String] = NSSearchPathForDirectoriesInDomains(FileManager.SearchPathDirectory.documentDirectory, FileManager.SearchPathDomainMask.allDomainsMask, true)

if dirs.count > 0 {
    let dir = dirs[0] //documents directory
    filePath = dir.appending("/" + fileName)
    print("Local path = \(filePath)")
} else {
    print("Could not find local directory to store file")
    return
}

// Set the contents
let fileContentToWrite = "Text to be recorded into file"

do {
    // Write contents to file
    try fileContentToWrite.write(toFile: filePath, atomically: false, encoding: String.Encoding.utf8)
}
catch let error as NSError {
    print("An error took place: \(error)")
}

You can also store string values into NSUserDefaults. Have a look at this code example to learn how to write and read values of different data types from NSUserDefaults


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