Data download-block form of asynchronous request

Here's a way to write a method that we use block for data asynchronous download//block form of asynchronous request-(void) asyncdownloadwithblock{//Chrysanthemum [uiapplication sharedapplication]    . networkactivityindicatorvisible = YES;        Converts a string into a URL address nsurl *url = [Nsurl URLWithString:self.myURLStr];        Create an object Nsurlrequest *request = [Nsurlrequest Requestwithurl:url];        Get home row Nsoperationqueue *mainqueue = [Nsoperationqueue mainqueue];    NSLog (@ "current:%@", [Nsthread CurrentThread]);    NSLog (@ "ismulti:%d", [Nsthread ismultithreaded]);    NSLog (@ "Start download"); [Nsurlconnection sendasynchronousrequest:request queue:mainqueue completionhandler:^ (NSURLResponse *response,        NSData *data, Nserror *connectionerror) {NSLog (@ "block callback, Download complete");        NSLog (@ "current:%@", [Nsthread CurrentThread]);                NSLog (@ "%d", [Nsthread ismultithreaded]);                Cancel Chrysanthemum [uiapplication sharedapplication].networkactivityindicatorvisible = NO;        NSLog (@ "%@", response); Nshttpurlresponse *httprespone = (nshttpurlresponsE *) response;                    Status code if (Httprespone.statuscode! =) {NSLog (@ "Download error"); } if (data &&!connectionerror) {//note here to determine that the data exists and the connection is not error self.imageView.image = [UIImage imagewith                    Data:data];        } else{NSLog (@ "Download error");    }            }];    NSLog (@ "current:%@", [Nsthread CurrentThread]);    NSLog (@ "ismulti:%d", [Nsthread ismultithreaded]);    NSLog (@ "************"); }

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Data download-block form of asynchronous request