Swift-WriteFile

var paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .allDomainsMask, true)
var root = paths.first
if let path = root?.appending("/image.jpg") {
    do {
        let url = URL(fileURLWithPath: path)
        try UIImagePNGRepresentation(image)?.write(to: url, options: Data.WritingOptions.atomicWrite)
    } catch {
        return
    }
}