How to Preload 'Realm' DB into iOS swift3?

Question

I am trying to implement Realm database in my app , I have realm database with some Preloaded data into it . I have searched through many stack overflow resources but didn't get any success.

So far now , I have done following steps :

1. Copy the Realm File into my app's bundle

2. Added following code in the app delegate :

   path = Bundle.main.path(forResource: "data", ofType: "realm")
   var config = Realm.Configuration(fileURL: NSURL(fileURLWithPath:      path!))
   config.readOnly = true
   
   // Open the Realm with the configuration
   let realm = try! Realm(configuration: config)
   

But this doesn't work , Please provide some solution to it .

Note : I don't want to migrate my database.

Thanks in advance

Answer 1

The piece of code below works perfectly for me to load a preloaded Realm instance during the first launch of my app:

let defaultPath = Realm.Configuration.defaultConfiguration.fileURL?.path
let path = Bundle.main.path(forResource: "default", ofType: "realm")
if !FileManager.default.fileExists(atPath: defaultPath!), let bundledPath = path {
    do {
        try FileManager.default.copyItem(atPath: bundledPath, toPath: defaultPath!)
    } catch {
        print("Error copying pre-populated Realm \(error)")
    }
}