GCD-usage and sumif Functions

GCD-usage and sumif Functions

Code:

 

-(Void) touchesBegan :( NSSet *) touches withEvent :( UIEvent *) event {dispatch_async (dispatch_get_global_queue (DISPATCH_QUEUE_PRIORITY_DEFAULT, 0 ), ^ {// parsing the url in the background 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 (), ^ {// success, jump back to the main interface NSLog (@ "call back, the data is: % @", data) ;}) ;}else {// failed. A failure prompt is returned. NSLog (@ "error when download: % @", error );}});}

 

 

Output:

21:51:37. 902 CGD-use [1719: 81744] call back, the data is: 
 
 
References
Http://www.cnblogs.com/pure/archive/2013/03/31/2977420.html