MBProgressHUD after selecting image in UIImagePickerController - ios

Question

I'm selecting an image in UIImagePickerController.
After the image was selected I'm firing another UIActionSheet to select from
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
_selected_image = info[UIImagePickerControllerEditedImage];
UIActionSheet *popup = [[UIActionSheet alloc] initWithTitle:#"" delegate:self cancelButtonTitle:#"Cancel" destructiveButtonTitle:nil otherButtonTitles:
#"Share this photo",
nil];
popup.tag = 2;
[popup showInView:[UIApplication sharedApplication].keyWindow];
}
When the user selects "Share" a long process is starting.
I want the MBProgressHUD to show during the process. I can't get progress HUD to show before stuff are starting to happen.
Tried two things:
- (void)actionSheet:(UIActionSheet *)popup clickedButtonAtIndex:(NSInteger)buttonIndex {
if (popup.tag == 1)
{
...
}
else if (popup.tag == 2)
{
if (buttonIndex == 1) //cancel
{
_selected_image = nil;
}
else if (buttonIndex == 0)
{
[imagePicker dismissViewControllerAnimated:YES completion:NULL];
[self doSharePhoto];
return;
}
[imagePicker dismissViewControllerAnimated:YES completion:NULL];
}
}
doSharePhotos start running when the imagePicker is still showing.
Tried:
- (void)actionSheet:(UIActionSheet *)popup clickedButtonAtIndex:(NSInteger)buttonIndex {
if (popup.tag == 1)
{
}
else if (popup.tag == 2)
{
if (buttonIndex == 1) //cancel
{
_selected_image = nil;
}
else if (buttonIndex == 0)
{
[imagePicker dismissViewControllerAnimated:YES completion:^{
[self doSharePhoto];
}];
return;
}
[imagePicker dismissViewControllerAnimated:YES completion:NULL];
}
}
and in this case the MBProgressHUD inside doSharePhoto doesn't apprear at all
** EDIT **:
The code that starts the HUD is in [self doSharePhoto]:
- (void)doSharePhoto {
MBProgressHUD *HUD = [MBProgressHUD showHUDAddedTo:self.navigationController.view animated:YES];
HUD.labelText = #"Please wait...";
HUD.delegate = self;
...
}
Any thoughts?

Answer 1

Does your doSharePhoto method perform the long running operation inside a seperate thread? If not it's blocking the main thread so , MBProgressHUD doesn't get a chance to show. Your doSharePhoto must look like this,
- (void)doSharePhoto {
[MBProgressHUD showHUDAddedTo:self.view animated:YES];
dispatch_async(dispatch_get_global_queue( DISPATCH_QUEUE_PRIORITY_LOW, 0), ^{
// Do the long running operation here...
dispatch_async(dispatch_get_main_queue(), ^{
[MBProgressHUD hideHUDForView:self.navigationController.view animated:YES];
});
});
}
EDIT: Problem might be with the view you add your HUD to,
Change
self.navigationController.view to
self.navigationController.visibleViewController.view
So,
[MBProgressHUD hideHUDForView:self.navigationController.visibleViewController.view animated:YES];