How to handle the UIActivityViewController "Cancel" button - objective-c

Question

There is a "cancel" button that comes by default with UIActivityViewController. How can I call a method when that button is pressed?
I have written this code to share the audio file.
NSURL* outURL;
UIActivityViewController *controller;
if (&UIActivityTypeAirDrop != NULL) {
controller.excludedActivityTypes = #[UIActivityTypeAirDrop];
for (int i=0;i<[arrayselecturls count];i++) {
str_SongsselectName=[[arrayselecturls objectAtIndex:i] objectForKey:#"Song"];
NSString* ext = [TSLibraryImport extensionForAssetURL:[[arrayselecturls objectAtIndex:i] objectForKey:#"SongURl"]];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
outURL = [[NSURL fileURLWithPath:[documentsDirectory stringByAppendingPathComponent:[[arrayselecturls objectAtIndex:i] objectForKey:#"Song"]]] URLByAppendingPathExtension:ext];
NSString *str_selectfilename=[NSString stringWithFormat:#"%#.mp3",str_SongsselectName];
// NSURL *url = outURL;
// NSLog(#"url is %#",url);
NSArray *objectsToShare = [NSArray arrayWithObjects:outURL,str_selectfilename, nil];
// objectsToShare = #[outURL];
controller = [[UIActivityViewController alloc] initWithActivityItems:objectsToShare applicationActivities:nil];
// Exclude all activities except AirDrop.
NSArray *excludedActivities = #[UIActivityTypePostToTwitter, UIActivityTypePostToFacebook,
UIActivityTypePostToWeibo,
UIActivityTypeMessage, UIActivityTypeMail,
UIActivityTypePrint, UIActivityTypeCopyToPasteboard,
UIActivityTypeAssignToContact, UIActivityTypeSaveToCameraRoll,
UIActivityTypeAddToReadingList, UIActivityTypePostToFlickr,
UIActivityTypePostToVimeo, UIActivityTypePostToTencentWeibo];
controller.excludedActivityTypes = excludedActivities;
}
[self presentViewController:controller animated:YES completion:nil];
}
else{
UIAlertView *Alert = [[UIAlertView alloc] initWithTitle:#"Sorry" message:#"Your device has no Airdrop!" delegate:self cancelButtonTitle:#"OK" otherButtonTitles:nil];
[Alert show];
}

Answer 1

oooooop!
I got the solution.This solution is working fine for me.
-(IBAction)ActionArtsist_airdropClick:(id)sender{
view_shareView.hidden=YES;
borderImageView . hidden =YES;
darkBg . hidden =YES;
view_artistdarlView.hidden=YES;
tblv_albumSongTableView.userInteractionEnabled=YES;
Data = [NSData dataWithContentsOfURL: exportURL];
UIActivityViewController *controller;
if (&UIActivityTypeAirDrop != NULL) {
controller.excludedActivityTypes = #[UIActivityTypeAirDrop];
NSString *str_selectfilename;
for (int i=0;i<[arr_atistsongsSelct count];i++) {
str_songsSlelectName=[[arr_atistsongsSelct objectAtIndex:i] objectForKey:#"songsName"];
NSString* ext = [TSLibraryImport extensionForAssetURL:[[arr_atistsongsSelct objectAtIndex:i] objectForKey:#"songsURl"]];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSURL* outURL = [[NSURL fileURLWithPath:[documentsDirectory stringByAppendingPathComponent:[[arr_atistsongsSelct objectAtIndex:i] objectForKey:#"songsName"]]] URLByAppendingPathExtension:ext];
str_selectfilename=[NSString stringWithFormat:#"%#.mp3",str_songsSlelectName];
NSArray *objectsToShare = [NSArray arrayWithObjects:outURL,str_selectfilename, nil];
controller = [[UIActivityViewController alloc] initWithActivityItems:objectsToShare applicationActivities:nil];
// Exclude all activities except AirDrop.
NSArray *excludedActivities = #[UIActivityTypePostToTwitter, UIActivityTypePostToFacebook,
UIActivityTypePostToWeibo,
UIActivityTypeMessage, UIActivityTypeMail,
UIActivityTypePrint, UIActivityTypeCopyToPasteboard,
UIActivityTypeAssignToContact, UIActivityTypeSaveToCameraRoll,
UIActivityTypeAddToReadingList, UIActivityTypePostToFlickr,
UIActivityTypePostToVimeo, UIActivityTypePostToTencentWeibo];
controller.excludedActivityTypes = excludedActivities;
}
This is the handling function.
**[controller setCompletionHandler:^(NSString *activityType, BOOL completed) {
if (!completed)
{
[MBProgressHUD showHUDAddedTo:self.view animated:YES];
[[UIApplication sharedApplication] beginIgnoringInteractionEvents];
[self performSelector:#selector(ActiviHideArtistSong) withObject:self afterDelay:4.0 ];
}
return;
}];**
upto here
[self presentViewController:controller animated:YES completion:nil];
}
else{
UIAlertView *warningAlert = [[UIAlertView alloc] initWithTitle:#"Sorry" message:#"Your device has no Airdrop!" delegate:self cancelButtonTitle:#"OK" otherButtonTitles:nil];
[warningAlert show];
}
}
-(void)ActiviHideArtistSong{
[self btnimageArtistSongscheck_lick:nil];
}