How to stop execution of a running background thread from main thread on swift while using DispatchQueue

Question

 DispatchQueue.global(qos: .background).async {
    //This will run on the background queue
    self.writeValue(tag: GlobalData.WRITE_DATA, data: getDataForWrite(1) )
           


        

Answer 1

I think the best solution is to execute DispatchWorkItem in async:

DispatchWorkItem encapsulates work that can be performed. A work item can be dispatched onto a DispatchQueue and within a DispatchGroup

so at the end your code might be:

let workItem = DispatchWorkItem {
   //.... writing stuff in background ....

   DispatchQueue.main.async {
      //.... done writing stuff, updating ui ....
   }
}
DispatchQueue.global().async(execute: workItem)

when you need to stop the execution just call .cancel():

//.... but, if stuff goes wrong ....
DispatchQueue.main.async {
   workItem.cancel()
}