How to use persist & retrieve an NSCoding compliant object to app Document directory in Swift 3?

Question

Here\'s a NSCoding compliant object. I would like to save and recover it from the app\'s documents directory in Swift 3. I imagine it\'s a save method and recover method. Ho

Answer 1

Saving:

// Get documents directory
if let docs = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).first {

    // Append your file name to the directory path
    let path = (docs as NSString).appendingPathComponent("filename")

    // Archive your object to a file at that path
    NSKeyedArchiver.archiveRootObject(yourObject, toFile: path)
}

Loading:

// Get documents directory
if let docs = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).first {

    // Append your file name to the directory path
    let path = (docs as NSString).appendingPathComponent("filename")

    // Unarchive your object from the file
    let yourObject = NSKeyedUnarchiver.unarchiveObject(withFile: path) as? Book

    // do whatever with yourObject
}