【读书笔记】iOS-GCD-使用方法

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代码：

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{                //在后台进行网址的解析操作        NSURL * url = [NSURL URLWithString:@"http://www.baidu.com"];        NSError * error;        NSString * data = [NSString stringWithContentsOfURL:url encoding:NSUTF8StringEncoding error:&error];        if (data != nil) {            dispatch_async(dispatch_get_main_queue(), ^{                //成功，跳转回主界面                NSLog(@"call back, the data is: %@", data);            });        } else {            //失败，返回失败提示。            NSLog(@"error when download:%@", error);        }    });    }

输出：

2015-07-15 21:51:37.902 CGD-使用[1719:81744] call back, the data is: <html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /></head><body style='margin:0px;overflow-x:hidden;overflow-y:hidden;'><iframe id='i' src="http://www.baidu.com/?tn=96181616_hao_pg" scrolling=auto width='100%' height='100%' frameborder='no' onload=''style='position:fixed;'></iframe></body></html>

参考资料

http://www.cnblogs.com/pure/archive/2013/03/31/2977420.html

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