iOS开发多线程篇—GCD的常见用法

原文  http://www.cnblogs.com/wendingding/p/3807716.html

 1 //
 2 //  YYViewController.m
 3 //  01-GCD的常见使用（延迟执行）
 4 //
 5 //  Created by apple on 14-6-25.
 6 //  Copyright (c) 2014年 itcase. All rights reserved.
 7 //
 8 
 9 #import "YYViewController.h"
10 
11 @interface YYViewController ()
12 
13 @end
14 
15 @implementation YYViewController
16 
17 - (void)viewDidLoad
18 {
19     [super viewDidLoad];
20     NSLog(@"打印线程----%@",[NSThread currentThread]);
21     //延迟执行
22     //第一种方法：延迟3秒钟调用run函数
23     [self performSelector:@selector(run) withObject:nil afterDelay:2.0];
24     
25 }
26 -(void)run
27 {
28     NSLog(@"延迟执行----%@",[NSThread currentThread]);
29 }
30 
31 -(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
32 {
33     //在异步函数中执行
34     dispatch_queue_t queue = dispatch_queue_create("wendingding", 0);
35     
36     dispatch_sync(queue, ^{
37         [self performSelector:@selector(test) withObject:nil afterDelay:1.0];
38     });
39     NSLog(@"异步函数");
40 }
41 -(void)test
42 {
43     NSLog(@"异步函数中延迟执行----%@",[NSThread currentThread]);
44 }
45 @end