GCD编程－串行队列与并发队列

接着上面的GCD封装，以下进行列子验证

1.导入GCD.h
2.创一个串行队列:

- (void)serailQueue{

//创建出队列

GCDQueue *queue = [[GCDQueue alloc]initSerial];

//运行队列中的线程

[queue execute:^{

NSLog(@"1");

}];

[queue execute:^{

NSLog(@"2");

}];

[queue execute:^{

NSLog(@"3");

}];

[queue execute:^{

NSLog(@"4");

}];

[queue execute:^{

NSLog(@"5");

}];

}

得出串行结果：

2015-07-11 10:34:28.641 GCDDelay[2262:174638] 1

2015-07-11 10:34:28.642 GCDDelay[2262:174638] 2

2015-07-11 10:34:28.642 GCDDelay[2262:174638] 3

2015-07-11 10:34:28.642 GCDDelay[2262:174638] 4

2015-07-11 10:34:28.643 GCDDelay[2262:174638] 5

3.并发队列

- (void)initConcurrent{

GCDQueue *queue = [[GCDQueue alloc]initConcurrent];

//运行队列中的线程

[queueexecute:^{

NSLog(@"1");

}];

[queue execute:^{

NSLog(@"2");

}];

[queue execute:^{

NSLog(@"3");

}];

[queue execute:^{

NSLog(@"4");

}];

[queue execute:^{

NSLog(@"5");

}];

}

得出并发结果：

2015-07-11 10:38:28.849 GCDDelay[2303:178328] 3

2015-07-11 10:38:28.849 GCDDelay[2303:178334] 4

2015-07-11 10:38:28.849 GCDDelay[2303:178325] 2

2015-07-11 10:38:28.849 GCDDelay[2303:178327] 1

2015-07-11 10:38:28.850 GCDDelay[2303:178335] 5

4.globalQueue 是默认级别的子线程 。一般在子线程中处理业务逻辑，主线程中更新UI

[GCDQueue
executeInGlobalQueue:^{

//处理业务逻辑

NSURLRequest *request = [NSURLRequestrequestWithURL:[NSURLURLWithString:@"***"]];

NSData *picData =[NSURLConnectionsendSynchronousRequest:request

returningResponse:nilerror:nil];

self.image = [UIImage imageWithData:picData];

[GCDQueue executeInMainQueue:^{

//主线程中更新UI

self.imageView.image =self.image;

}];

}];

总结：

串行队列一次仅仅运行一个线程，依照加入到队列的顺序依次运行
并发队列一次能够运行多个线程，线程的运行没有先后顺序
UI界面所在的线程队列是串行队列