MBProgressHUD not showing from another class - ios

Question

I'm getting values from Parse Cloud by pressing a button. The code for getting the data data from Parse is in another class, but when I try to show the MBProgessHUD from that class it doesn't do anything.
No errors either. However, if I do all in the same class, it works. Not sure how to display the progressHUD from another class on a specific view which is open at that time.
- (IBAction)testWeather:(id)sender {
Reports * obje2 = [[Reports alloc]init];
[obje2 startGetting];
}
// in reports class
-(void) startGetting {
Names= [[NSMutableArray alloc] init];
Latitude= [[NSMutableArray alloc] init];
Longitude= [[NSMutableArray alloc] init];
[Names removeAllObjects];
[Latitude removeAllObjects];
[Longitude removeAllObjects];
NSUserDefaults * standardUserDefaults = [NSUserDefaults standardUserDefaults];
NSString *CountyName = [standardUserDefaults stringForKey:#"CurrentlySelectedCounty"];
PFQuery *query = [PFQuery queryWithClassName:#"Reports"];
[query whereKey:#"County" equalTo:#"Universal"];
//
NSInteger countTotal= [query countObjects];
NSString *totalVals = [NSString stringWithFormat: #"%d", (int)countTotal];
[[NSUserDefaults standardUserDefaults] setObject:totalVals forKey:#"NumberOfSwamps"];
//
NSString * storyboardName = #"Main_iPhone";
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:storyboardName bundle: nil];
UIViewController * vc = [storyboard instantiateViewControllerWithIdentifier:#"browsePage"];
MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:vc.view animated:YES];
hud.mode = MBProgressHUDModeIndeterminate;
hud.labelText = #"Loading Reports";
[hud show:YES];
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
[hud hide:YES];
if (!error) {
for (PFObject *obj in objects) {
NSString *LastName = [obj objectForKey:#"Name"] ;
NSString *Lat = [obj objectForKey:#"Latitude"] ;
NSString *Lon = [obj objectForKey:#"Longitude"] ;
// add values to array
[Names addObject:LastName];
[Latitude addObject:Lat];
[Longitude addObject:Lon];
[self getResults];
}
}
else{
NSLog(#"Error: %# %#", error, [error userInfo]);
}
}];
}
Trying another way...but this doesn't work either...even though HUD is running from the original class.
browse.m,
if (myInt == 8){
NSLog(#"\n \n Pressed the refresh icon for reports");
[self removeAllAnnotations];
[standardUserDefaults setInteger:1 forKey:#"HUD_Switch"]; // to make sure switching on
[standardUserDefaults synchronize];
[self HUDSwitcher];
Reports * obje2 = [[Reports alloc]init];
[obje2 startGetting];
}
-(void) HUDSwitcher{
NSUserDefaults * standardUserDefaults = [NSUserDefaults standardUserDefaults];
NSInteger myInt = [standardUserDefaults integerForKey:#"HUD_Switch"]; // 0 for switched off .... 1 for switched on
NSString * storyboardName = #"Main_iPhone";
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:storyboardName bundle: nil];
UIViewController * vc = [storyboard instantiateViewControllerWithIdentifier:#"browsePage"];
MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:vc.view animated:YES];
hud.mode = MBProgressHUDModeIndeterminate;
hud.labelText = #"Testing";
[hud show:YES];
if (myInt==0) {
[hud hide:YES];
}
}
reports.m
[standardUserDefaults setInteger:1 forKey:#"HUD_Switch"]; // to switch on the HUD value
browsePage * obje2 = [[browsePage alloc]init];
[obje2 HUDSwitcher];
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
[standardUserDefaults setInteger:0 forKey:#"HUD_Switch"];
[standardUserDefaults synchronize];
browsePage * obje2 = [[browsePage alloc]init];
[obje2 HUDSwitcher];
if (!error) {
for (PFObject *obj in objects) {
NSString *LastName = [obj objectForKey:#"Name"] ;
NSString *Lat = [obj objectForKey:#"Latitude"] ;
NSString *Lon = [obj objectForKey:#"Longitude"] ;
// add values to array
[Names addObject:LastName];
[Latitude addObject:Lat];
[Longitude addObject:Lon];
[self getResults];
}
}
else{
NSLog(#"Error: %# %#", error, [error userInfo]);
}
}];
}

Answer 1

When you instantiate the new UIViewController vc, it is not in the current view stack, so if you display a progressHUD on its view it won't appear on the screen.
You should display the progressHUD from the view of the initial viewController.
One way to solve this would be with delegation like this:
- (IBAction)testWeather:(id)sender {
self.hud = [MBProgressHUD showHUDAddedTo:self.view animated:YES];
hud.mode = MBProgressHUDModeIndeterminate;
hud.labelText = #"Loading Reports";
[hud show:YES];
Reports * obje2 = [[Reports alloc]init];
[obje2 startGettingWithDelegate:self];
}
- (void)reports:(Reports*)report didFinishGetting
{
[self.hud hide:YES];
}
In yourViewController interface in the .h file add this:
#property (nonatomic, strong) MBProgressHUD *hud;
In Reports Class
-(void) startGettingWithDelegate:id<yourProtocol> delegate {
Names= [[NSMutableArray alloc] init];
Latitude= [[NSMutableArray alloc] init];
Longitude= [[NSMutableArray alloc] init];
[Names removeAllObjects];
[Latitude removeAllObjects];
[Longitude removeAllObjects];
NSUserDefaults * standardUserDefaults = [NSUserDefaults standardUserDefaults];
NSString *CountyName = [standardUserDefaults stringForKey:#"CurrentlySelectedCounty"];
PFQuery *query = [PFQuery queryWithClassName:#"Reports"];
[query whereKey:#"County" equalTo:#"Universal"];
//
NSInteger countTotal= [query countObjects];
NSString *totalVals = [NSString stringWithFormat: #"%d", (int)countTotal];
[[NSUserDefaults standardUserDefaults] setObject:totalVals forKey:#"NumberOfSwamps"];
//
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
// Inform Delegate that finished loading
[delegate reports:self didFinishLoading];
if (!error) {
for (PFObject *obj in objects) {
NSString *LastName = [obj objectForKey:#"Name"] ;
NSString *Lat = [obj objectForKey:#"Latitude"] ;
NSString *Lon = [obj objectForKey:#"Longitude"] ;
// add values to array
[Names addObject:LastName];
[Latitude addObject:Lat];
[Longitude addObject:Lon];
[self getResults];
}
} else {
NSLog(#"Error: %# %#", error, [error userInfo]);
}
}];
}
To do this right you should create a #protocol in Reports.h and make you viewController conform to it.
In Reports.h
#protocol ReportsProtocol
- (void)reports:(Reports*) finishedLoading;
#end
#interface ...
.
.
.
In yourViewController.h
#interface YourViewController : UIViewController <ReportsProtocol>
.
.
.
Another solution can be using blocks. Its a little more complicated but cleaner.