iOS: HowTo send SIGNAL when Controller ends preview

[ekkescorner]

For my Sharing Example App I have to send a SIGNAL when UIDocumentInteractionController ends preview.

MyShare.mm:

void MyShare::sendFile(...) {
    static DocViewController* docViewController = nil;
    ...
    docViewController = [[DocViewController alloc] init];
    [qtUIViewController addChildViewController:docViewController];
    documentInteractionController.delegate = docViewController;
    [documentInteractionController presentPreviewAnimated:YES];
    ...
}
// TODO: HowTo call this method from docViewController ?
void MyShare::handleDocumentPreviewDone() {
	// send the SIGNAL
	emit shareFinished();
}

DocViewController.mm:

#import "DocViewController.h"
@interface DocViewController ()
@end
@implementation DocViewController
#pragma mark -
#pragma mark View Life Cycle
- (void)viewDidLoad {
    [super viewDidLoad];
}
#pragma mark -
#pragma mark Document Interaction Controller Delegate Methods
- (UIViewController *) documentInteractionControllerViewControllerForPreview: (UIDocumentInteractionController *) controller {
    #pragma unused (controller)
    return self;
}
- (void)documentInteractionControllerDidEndPreview:(UIDocumentInteractionController *)controller
{
    #pragma unused (controller)
    // TODO HowTo call handleDocumentPreviewDone() from MyShare ??
    [self removeFromParentViewController];
}
@end

I have no Obj-C knowledge, it's even hard to 'read' the syntax - that's why I'm not developing native for iOS and using Qt ;-)
any ideas what to do ?
it's the very last step before I'll make my Sharing Example App for Android and iOS public.
thx

[ekkescorner]

here's the Blog: http://blog.qt.io/blog/2017/12/01/sharing-files-android-ios-qt-app/
thx to all helping me with this

[ekkescorner]

is there anybody out there ...
... with some Obj-C knowledge ?

thx

[tekojo]

@ekkescorner did you ask on QtMob yet? (https://qtmob.slack.com/ for those who don't know the place)

[ekkescorner]

@tekojo yes, I already asked there some days ago.
will try Interests list and StackOverFlow

[SGaist]

Hi,

Add a custom init function to DocViewController which takes a MyShare object as parameter (e.g. initWithMyShare) then pass it the instance of your object and store it as a local variable. Then just call the method on the object in documentInteractionControllerDidEndPreview.

You can see an implementation example for the iOS clipboard support class.

Hope it helps

[ekkescorner]

@SGaist thx. will try to figure out the correct syntax ;-)

[ekkescorner]

@SGaist thx to your hints I found a way to make it work.
I'm writing a blog about the App and perhaps someone can take a look at the code if it's ok.

[SGaist]

I'd be happy to review it.

[ekkescorner]

@SGaist cool. will let you know when it's public. probably tomorrow.
this was the last open topic on iOS.
I must know when preview was done, because if sharing a File from App Data Location, the File must be copied to Documents Location to be available for UIDocumentInteractionController. Then when user comes back to the App I must delete the File from Documents location.

[SGaist]

Might be a job for QTemporaryFile ?

[ekkescorner]

@SGaist I need the origin filename, so I don't think so.
BTW: on iOS I must always delete the file from Documents location,
on Android if ACTION_VIEW intent I also delete the file,
but if ACTION_EDIT then depending from result code I must move File back into origin AppDataLocation or simply delete if Edit was canceled.

[ekkescorner]

here's the Blog: http://blog.qt.io/blog/2017/12/01/sharing-files-android-ios-qt-app/
thx to all helping me with this