Showing spinner using spinKit in iOS while fetching JSON - ios

Question

What I am trying to do is, on a click of a button I am fetching data using AFNetworking pod. What i want is after fetching data I want to display NSLog(#"/n /nAfter fetching"); but it is coming before the json data.
Here is the code I have written in IBAction of Button.
dispatch_queue_t queue = dispatch_get_global_queue(
DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
dispatch_sync(queue, ^{
//Load the json on another thread
NSURL *url = [NSURL URLWithString:finalURL];
NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
AFURLSessionManager *manager = [[AFURLSessionManager alloc]initWithSessionConfiguration:configuration];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
NSURLSessionDataTask *dataTask = [manager dataTaskWithRequest:request completionHandler:^(NSURLResponse *response,id responseObject, NSError *error) {
if (error) {
NSLog(#"\n Error --> %#",error);
}
else{
jsonDictionary = (NSDictionary*) responseObject;
NSLog(#"/n Data :: %#",jsonDictionary);
}
}];
[dataTask resume];
});
NSLog(#"/n /nAfter fetching");
Please provide a nice way of doing it and do correct me If I have gone wrong with it. Thank you.

Answer 1

As AFURLSessionManager makes the Asynchronous operation. YOu will get the data in completion
dispatch_queue_t queue = dispatch_get_global_queue(
DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
dispatch_sync(queue, ^{
//Load the json on another thread
[self startSpinner];
NSURL *url = [NSURL URLWithString:finalURL];
NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
AFURLSessionManager *manager = [[AFURLSessionManager alloc]initWithSessionConfiguration:configuration];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
NSURLSessionDataTask *dataTask = [manager dataTaskWithRequest:request completionHandler:^(NSURLResponse *response,id responseObject, NSError *error) {
[self stopSpinner];
if (error) {
NSLog(#"\n Error --> %#",error);
}
else{
NSLog(#"/n /nAfter fetching"); //this is where you receive data
jsonDictionary = (NSDictionary*) responseObject;
NSLog(#"/n Data :: %#",jsonDictionary);
}
}];
[dataTask resume];
});
if you want to make synchronous operation using URLSession below method will help you
+ (NSData *)sendSynchronousRequest:(NSURLRequest *)request
returningResponse:(__autoreleasing NSURLResponse **)responsePtr
error:(__autoreleasing NSError **)errorPtr {
dispatch_semaphore_t sem;
__block NSData * result;
result = nil;
sem = dispatch_semaphore_create(0);
[[[NSURLSession sharedSession] dataTaskWithRequest:request
completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
if (errorPtr != NULL) {
*errorPtr = error;
}
if (responsePtr != NULL) {
*responsePtr = response;
}
if (error == nil) {
result = data;
}
dispatch_semaphore_signal(sem);
}] resume];
dispatch_semaphore_wait(sem, DISPATCH_TIME_FOREVER);
return result;
}