Write String Value Into a File

In this short code example we will learn how to:

  • Find a Documents directory on device in Swift
  • Write a String value into a file in Documents directory
  
        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:

NSUserDefaults example in Swift


Learn iOS Development with these Video Courses


How to Make a Freaking iPhone App - iOS 10 and Swift 3
icon icon


iOS 10 & Swift 3: From Beginner to Paid Professional
icon


The Complete iOS 10 Developer Course - Build 21 Apps
icon


Swift 3 - Learn to Code with Apple's New Language
icon icon


Learn How to Build Mobile Apps for iOS with Swift, PHP and MySQL
icon icon

Follow me on one of your favourite social networks to learn about new video tutorials and code examples:

Twitter: @SwiftVideoBlog
Google Plus: https://plus.google.com/+SergeyKargopolov/posts
Facebook: Swift Developer Blog on Facebook