how to change my synchronous to asynchronous call in Objective-C? - objective-c

Question

hi friend i am beginner for objective-c.i have slow response from server side due to synchronous call. i analysed in google the call may be asynchronous means the response speed will be high, but i don't know much about NSURLConnection and GCD. so please help me how to change my call asynchronous . see my code below`
- (void)application:(UIApplication *)app didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken {
NSString* oldToken = [self deviceToken];
NSString *newToken = [[[[deviceToken description]stringByReplacingOccurrencesOfString:#"<"withString:#""]
stringByReplacingOccurrencesOfString:#">" withString:#""]
stringByReplacingOccurrencesOfString: #" " withString: #""];
NSLog(#"My token is: %#", newToken);
[self setDeviceToken:newToken];
if (![newToken isEqualToString:oldToken])
{
[self calur:newToken];
}
}
- (NSString*)deviceToken{
return [[NSUserDefaults standardUserDefaults] stringForKey:#"deviceid"];
}
- (void)setDeviceToken:(NSString*)token{
[[NSUserDefaults standardUserDefaults] setObject:token forKey:#"deviceid"];
}
//This function used to store a notification device id to our notification databae
-(void)calur:(NSString *)device
{
NSString *post =[NSString stringWithFormat:#"deviceId=%#",device];
NSString *hostStr = #"https://myserver.com/Ver_2_0/notification/check.php?";
NSError *error = nil;
NSString *nocon=[NSString stringWithContentsOfURL:[NSURL URLWithString:hostStr]encoding:NSUTF8StringEncoding error:&error];
if (nocon == nil)
{
NSLog(#"NO Connection");
}
else
{
hostStr = [hostStr stringByAppendingString:post];
NSData *dataURL = [NSData dataWithContentsOfURL: [ NSURL URLWithString: hostStr ]];
NSString *serverOutput = [[NSString alloc] initWithData:dataURL encoding: NSASCIIStringEncoding];
NSLog(#"hostStr=%#",hostStr);
NSLog(#"serverOutput = %#",serverOutput);
NSLog(#"dataURL=%#",dataURL);
// NSData *dataurl=dataURL;
if([serverOutput isEqualToString:#"Token Updated Successfully"])
{
NSLog(#"badge updated");
}
else
{
NSLog(#"serverOutput = %#",serverOutput);
NSLog(#"not registered");
}
[serverOutput release];
}
}`

Answer 1

if (nocon == nil)
{
NSLog(#"NO Connection");
}
else
{
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
hostStr = [hostStr stringByAppendingString:post];
NSData *dataURL = [NSData dataWithContentsOfURL: [ NSURL URLWithString: hostStr ]];
NSString *serverOutput = [[NSString alloc] initWithData:dataURL encoding: NSASCIIStringEncoding];
NSLog(#"hostStr=%#",hostStr);
NSLog(#"serverOutput = %#",serverOutput);
NSLog(#"dataURL=%#",dataURL);
// NSData *dataurl=dataURL;
if([serverOutput isEqualToString:#"Token Updated Successfully"])
{
NSLog(#"badge updated");
}
else
{
NSLog(#"serverOutput = %#",serverOutput);
NSLog(#"not registered");
}
[serverOutput release];
});
}

Answer 2

a little snippet:
#import "AFNetworking.h"
#define kBgQueue dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
NSDictionary *params = [NSDictionary dictionaryWithObjectsAndKeys:self.value, #"POSTvar", nil];
AFHTTPClient *client = [[AFHTTPClient alloc] initWithBaseURL: [NSURL URLWithString:#"http://your.address"]];
NSURLRequest *request = [client requestWithMethod:#"POST" path:nil parameters:params];
AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {
// do some with JSON
} failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) {
NSLog(#"Request Failed with Error: %#, %#", error, error.userInfo);
}];
[operation start];
});
AFNetworking github