Kas on võimalik muuta massiivi klassi meetodi sees, saades andmeid asünkroonselt taustal läbi sulgemise, kui see sulgemine toimub väljaspool peamist niiti?

Modifying an array within a class method from a closure that does not execute on the main thread is technically possible, but it can lead to thread safety issues. In iOS, collections like arrays are not thread-safe by default. If multiple threads modify the same array simultaneously, it can cause race conditions, crashes, or unpredictable behavior.

To safely modify an array from a background thread, synchronization mechanisms such as DispatchQueue with barriers, NSLock, or other locking mechanisms should be used. Often, updates to UI or UI-related data are performed on the main thread:

DispatchQueue.global().async {
    // Asynchronous data loading
    let newData = [1, 2, 3]
    DispatchQueue.main.async {
        self.array.append(contentsOf: newData) // safely on the main thread
    }
}

If the array is used only in the background and not shared with the main thread, it can be modified without locks, but this is rare.

In summary: it can be modified, but thread safety must be ensured, otherwise errors may occur.