What methods can be used to organize a task queue in a system?

In iOS, task queues are often organized using:

• DispatchQueue (GCD) — allows creating serial and concurrent queues for executing tasks asynchronously or synchronously.
• OperationQueue and Operation — a higher-level API that manages dependencies between tasks, priorities, and cancellation of operations.

Example of using DispatchQueue:

let queue = DispatchQueue(label: "com.example.myqueue")
queue.async {
    // task code
}

Example with OperationQueue:

let operationQueue = OperationQueue()
let operation = BlockOperation {
    // task code
}
operationQueue.addOperation(operation)

You can also use third-party libraries or custom queue implementations, but GCD and OperationQueue are standard and the most common methods.