I want to thread data read from realm in iOS

Question

Reading data from ios to realm and using threads at the same time But "Realm accessed from incorrect thread." An error occurs Is there a problem with your code?

let realm = try! Realm()
        let readData = realm.objects(DataRealm.self)
        for i in 0...readData.count-1 {

            DispatchQueue.global().async {
                self.parsing()
            }
        }

Answer 1

You cannot use Realm objects across threads. That's why you get this error.
But you can use references which you can pass across them. I am not sure how to apply it to your code since there is no part where you use the individual objects from readData . But what you are searching for might be something like this:

let realm = try! Realm()
let readData = realm.objects(DataRealm.self)
for data in readData {
    let readDataRef = ThreadSafeReference(to: data)
    DispatchQueue.global().async {
        self.parsing(readDataReference: readDataRef)
    }
}

In your parsing() method you would need to get the object from the reference then:

let data = realm.resolve(readDataReference)