DISPATCH_QUEUE_PRIORITY_HIGH
Tasks run at the highest priority, which is equivalent to the user-initiated quality-of-service level.
Declaration
var DISPATCH_QUEUE_PRIORITY_HIGH: Int32 { get }Discussion
Use quality-of-service constants instead. This constant maps to the QOS_CLASS_USER_INITIATED class.
Items dispatched to the queue run at high priority; the queue is scheduled for execution before any default priority or low priority queue.