ios - How to use dispatch queue for high Priority in background in Swift 3.1 -

    let dict_one=result[i]      let product:allproducts=allproducts()      product.applications=dict_one.objectforkey("applications") as? string      product.desc=dict_one.objectforkey("description") as? string      product.familyid=string(dict_one.objectforkey("familyid") as! int)      if dict_one.objectforkey("imagename") as? string  != nil     {         product.imagename=dict_one.objectforkey("imagename") as? string          let url:string =  appconstant.getallimages + (dict_one.objectforkey("imagename") as? string)!          dispatch_async(dispatch_get_global_queue(dispatch_queue_priority_background, 0))         {          let imagepath=self.fileindocumentsdirectory((dict_one.objectforkey("imagename") as? string)!)          self.saveimage(url, image_name1: (dict_one.objectforkey("imagename") as? string)!,path: imagepath)         }     }     else     {         product.imagename=""     } 

i need use dispatch queue high priority in background in swift 3.1 can find out solution?

here go:

dispatchqueue.global(qos: .userinitiated).async { //your code goes here //coming main queue update ui dispatchqueue.main.async { //update ui (reloading tableview, label update, etc. here) } } 

hope helps.