Update progress of MBProgressHUD - ios

Question

I have a scenario in which my app downloads a large chunk of data only for the first time and this happens in say ViewController1. I'm using a different class to download the data and another one to save the data. So my question is, how can I update the progress of MBProgressHUD object created in ViewController1 to display the progress to the user?
The approach that I've adopted is to use NSNotificationCenter to send notifications. I'm sending notifications at the end of methods (13) in the class that saves data.
Here's what I've been doing:
//ViewController1.h
#interface ViewController1 ()
{
MBProgressHUD *hud;
float progress;
}
#end
//ViewController1.m
- (void)viewDidLoad {
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(receiveNotification:)
name:#"downloadComplete"
object:nil];
}
- (IBAction)sumitButtonDidClick:(id)sender {
hud = [[MBProgressHUD alloc] init];
hud = [MBProgressHUD showHUDAddedTo:self.view animated:YES];
hud.mode = MBProgressHUDModeDeterminateHorizontalBar;
hud.label.text = NSLocalizedString(#"Please wait...", #"HUD preparing title");
hud.minSize = CGSizeMake(150.f, 100.f);
[hud showAnimated:YES];
double delayInSeconds = 1.0;
dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delayInSeconds * NSEC_PER_SEC));
progress = 0.0f;
dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
DownloadClass * obj1 = [[DownloadClass alloc] init];
[obj1 downloadData];
dispatch_async(dispatch_get_main_queue(), ^{
[hud hideAnimated:YES];
});
}
- (void) receiveNotification:(NSNotification *) notification {
if ([[notification name] isEqualToString:#"downloadComplete"])
{
NSLog (#"Successfully received the download complete notification!");
progress += 7.7f;
//[hud setProgress:progress]; // won't work
dispatch_async(dispatch_get_main_queue(), ^{
[MBProgressHUD HUDForView:self.view].progress = progress;
});
}
}
Update: I'm receiving the notifications posted by the class that saves
data

Answer 1

You have created a instance variable for MBProgressHUD as MBProgressHUD *hud; and you start progress on a sumitButtonDidClick method as below :
hud = [[MBProgressHUD alloc] initWithFrame:CGRectMake(0, -30, 320, 768) ];
hud.mode = MBProgressHUDModeDeterminateHorizontalBar;
hud.label.text = NSLocalizedString(#"Please wait...", #"HUD preparing title");
hud.minSize = CGSizeMake(150.f, 100.f);
UIWindow *window=[[[UIApplication sharedApplication]delegate]window];
hud.center=window.center;
[window addSubview:hud];
[hud showAnimated:YES];
But increasing progress as Class method of MBProgressHUD as [MBProgressHUD HUDForView:self.view].progress = progress;.
Fix for the issue is below :
dispatch_async(dispatch_get_main_queue(), ^{
hud.progress = progress;
});
if you want to hide the progress you can use
dispatch_async(dispatch_get_main_queue(), ^{
[hud hideAnimated:YES];
});

Answer 2

According to the documentation for MBProgressHUD you appear to be creating the HUD incorrectly. The example they give, is as follows...
MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:self.view animated:YES];
// Set the bar determinate mode to show task progress.
hud.mode = MBProgressHUDModeDeterminateHorizontalBar;
hud.label.text = NSLocalizedString(#"Loading...", #"HUD loading title");
dispatch_async(dispatch_get_global_queue( DISPATCH_QUEUE_PRIORITY_LOW, 0), ^{
// Do something...
dispatch_async(dispatch_get_main_queue(), ^{
[MBProgressHUD hideHUDForView:self.view animated:YES];
});
});
You are creating an instance and attaching it to UIWindow

Answer 3

The official documentation lists it like this:
MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:self.view animated:YES];
hud.mode = MBProgressHUDModeAnnularDeterminate;
hud.label.text = #"Loading";
NSProgress *progress = [self doSomethingInBackgroundCompletion:^{
[hud hideAnimated:YES];
}];
hud.progressObject = progress;
You can find it here: https://github.com/jdg/MBProgressHUD