Swift 3 warning for dispatch async

Question

I have this code:

DispatchQueue.global(priority: DispatchQueue.GlobalQueuePriority.default).async {
                let url = URL(string: itemImageURL )
                 


        

Answer 1

Instead of using priority parameter:

DispatchQueue.global(priority: DispatchQueue.GlobalQueuePriority.default).async {
 // ...
}

use qos parameter that uses a different enum DispatchQoS.QoSClass.default but you can also use its enum value as just .default:

DispatchQueue.global(qos: .default).async {
 // ...
}

Swift 3 has brought many changes on GCD(Grand Central Dispatch).