Operation (Swift)

Introduction:

Nsoperation is an abstract class and does not have the ability to encapsulate operations, it must use its subclasses;

blockoperation:

Operations are performed asynchronously as long as the blockoperation encapsulated operand > 1, but no unlimited creation of threads

Let Blockope = blockoperation ()        = . Veryhigh        Blockope.addexecutionblock {            print ("  blockoperation executed ", Thread.current)        }        blockope.addexecutionblock {            Print ("BlockOperation2 executed ", Thread.current)        }        Blockope.start ()  / /Start execution         / // Cancel 

Results:

Nsoperationqueue Creating a queue

1.1 Gets the home column and adds operations to the queue, the home column is a serial queue, regardless of whether the maximum number of concurrent sets is executed on the current thread, and no new threads are created

1    Let queue = operationqueue.main2        queue.addoperation {3              for inch 0... 50000 {4                 print ("OperationQueue1 executed ", Thread.current)  5            }6         }

Results:

2.1 Simultaneous serial and concurrent functions, which are concurrent by default, can be manually set to serial queue, by setting the maximum concurrency Number property to change

1 c func racstest () {2Let queue =Operationqueue ()3Queue.maxconcurrentoperationcount =Ten4 queue.addoperation {5              for_inch 0...50000{6Print"OperationQueue1 executed the", Thread.current)7             }8         }9         //Addoperation has already executed the Start method internally .

Results:

Operation (Swift)