Deferred call -05-GCD

1 //2 //VIEWCONTROLLER.M3 //05-GCD Deferred Call4 //5 //Created by Mac on 16/4/21.6 //copyright©2016 Year Mac. All rights reserved.7 //8 9 #import "ViewController.h"Ten  One @interfaceViewcontroller () A  - @end -  the @implementationViewcontroller -  -- (void) Viewdidload { - [Super Viewdidload]; +      - } +  A- (void) Touchesbegan: (Nsset<uitouch *> *) touches withevent: (Uievent *)Event { at      - [self delay3]; - } -  - /** - * Non-deferred calls in  */ -- (void) DelayThread1 { to   +dispatch_queue_t queue = Dispatch_get_global_queue (Dispatch_queue_priority_default,0); -Dispatch_after (Dispatch_time_now, queue, ^{ the         *NSLog (@"delay = = =%@", [Nsthread CurrentThread]); $     });Panax Notoginseng } - /** the * Delay calls and turn on multithreading +  */ A- (void) delayThread2 { the      +dispatch_queue_t queue = Dispatch_get_global_queue (Dispatch_queue_priority_default,0); -Dispatch_after (Dispatch_time (Dispatch_time_now, (int64_t) (3* nsec_per_sec)), queue, ^{ $          $NSLog (@"delaythread2===%@", [Nsthread CurrentThread]); -     }); - } the  - /**Wuyi * Three methods implement deferred invocation, do not open multi-threading, execute in main thread the  */ -- (void) Delay1 { Wu      -[Nsthread Sleepfortimeinterval:3]; AboutNSLog (@"delay1=%@", [Nsthread CurrentThread]); $ } -- (void) Delay2 { -      -[Self performselector: @selector (Download:) Withobject:@"http://333.jpg"Afterdelay:3]; A } +- (void) Delay3 { the      -dispatch_queue_t queue =dispatch_get_main_queue (); $Dispatch_after (Dispatch_time (Dispatch_time_now, (int64_t) (3* nsec_per_sec)), queue, ^{ the          theNSLog (@"delay3=%@", [Nsthread CurrentThread]); the          the     }); -      in     /*GCD: Equivalent to the above the Dispatch_after (Dispatch_time (Dispatch_time_now, (int64_t) (3 * nsec_per_sec)), Dispatch_get_main_queue (), ^{  the          About NSLog (@ "delay3=%@", [Nsthread CurrentThread]); the          the     });*/ the      +      -      theNSLog (@"delay====%@", [Nsthread CurrentThread]);Bayi } the  the- (void) Download: (NSString *) URL { -      -NSLog (@"delay2=%@", [Nsthread CurrentThread]); the } the  the  the @end

Deferred call -05-GCD