Difference between DispatchQueue.main.async and DispatchQueue.main.sync

Question

I have been using DispatchQueue.main.async for a long time to perform UI related operations.



Swift provides both DispatchQueue.main.async

Answer 1

GCD allows you to execute a task synchronously or asynchronously[About]

synchronous(block and wait) function returns a control when the task will be completed

asynchronous(dispatch and proceed) function returns a control immediately, dispatching the task to start to an appropriate queue but not waiting for it to complete.

[DispatchQueue]