Using the MPProgressHUD and NSSession to load data sync - objective-c

Question

I have a method that loads data asynchronously.
-(void)loadingDataAsynchronously{
NSURL *url = [NSURL URLWithString:#"http://vbahrain.azurewebsites.net/api/yearapi"];
NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];
NSURLSession *session = [NSURLSession sharedSession];
NSURLSessionDownloadTask *task = [session downloadTaskWithRequest:request completionHandler:^(NSURL *location, NSURLResponse *response, NSError *error) {
NSData *data = [[NSData alloc] initWithContentsOfURL:location];
NSArray *array = [NSJSONSerialization JSONObjectWithData:data options:0 error:&error];
self.yearBucket = [NSMutableArray array];
for (NSDictionary * dict in array) {
Year *year = [[Year alloc ]init];
year.yearName =[dict objectForKey:#"Year"];
year.speeches = [dict objectForKey:#"Speeches"];
[self.yearBucket addObject:year];
}
dispatch_async(dispatch_get_main_queue(), ^{
[self.tableView reloadData];
});
}];
[task resume];
}
This is the code that I'm using to load the MPProgressHUD.
- (void)viewDidLoad
{
[super viewDidLoad];
HUD = [[MBProgressHUD alloc] initWithView:self.view];
[self.view addSubview:HUD];
HUD.mode = MBProgressHUDModeDeterminate;
HUD.labelText = #"Loading";
HUD.delegate = self;
[HUD showWhileExecuting:#selector(loadingDataAsynchronously) onTarget:self withObject:Nil animated:YES];
}
The MPProgressHUD appears and vanishes in a second. How do I get to show the MPProgressHUD to display the actual progress on loading data in the background thread.

Answer 1

You can try to remove the HUD inside the loadingDataAsynchronously method.
- (void)viewDidLoad
{
[super viewDidLoad];
[MBProgressHUD showHUDAddedTo:self.view animated:YES];
dispatch_async(dispatch_get_global_queue( DISPATCH_QUEUE_PRIORITY_LOW, 0), ^{
[self loadingDataAsynchronously];
});
}
-(void)loadingDataAsynchronously{
NSURL *url = [NSURL URLWithString:#"http://vbahrain.azurewebsites.net/api/yearapi"];
...
dispatch_async(dispatch_get_main_queue(), ^{
[self.tableView reloadData];
[MBProgressHUD hideHUDForView:self.view animated:YES];
});
...
}