Show UIDocumentInteractionController from share button in nav bar - iOS - ios

Question

In my project I'm using WSAssetPickerController.
Despite the toolbar not working (not a huge issue), everything is working fine.
I have added a share button in the view controller, but I can't seem to get the UIDocumentInteractionController to get called, I tried copying the same method I'm using for files saved in the apps folder (which works fine). But here it's not.
How the irrelevant Downloads page works:
NSString *fileName = [directoryContents objectAtIndex:indexPath.row];
NSString *path;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
path = [[paths objectAtIndex:0] stringByAppendingPathComponent:#"Downloads"];
path = [path stringByAppendingPathComponent:fileName];
documentController = [[UIDocumentInteractionController alloc] init];
documentController = [UIDocumentInteractionController interactionControllerWithURL:[NSURL fileURLWithPath:path]];
[documentController setDelegate:self];
[documentController presentOpenInMenuFromRect:CGRectZero inView:self.view animated:YES];
How the images get loaded:
#pragma mark - Fetching Code
- (void)fetchAssets
{
// TODO: Listen to ALAssetsLibrary changes in order to update the library if it changes.
// (e.g. if user closes, opens Photos and deletes/takes a photo, we'll get out of range/other error when they come back.
// IDEA: Perhaps the best solution, since this is a modal controller, is to close the modal controller.
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
[self.assetsGroup enumerateAssetsWithOptions:NSEnumerationReverse usingBlock:^(ALAsset *result, NSUInteger index, BOOL *stop) {
if (!result || index == NSNotFound) {
dispatch_async(dispatch_get_main_queue(), ^{
[self.tableView reloadData];
self.navigationItem.title = [NSString stringWithFormat:#"%#", [self.assetsGroup valueForProperty:ALAssetsGroupPropertyName]];
});
return;
}
WSAssetWrapper *assetWrapper = [[WSAssetWrapper alloc] initWithAsset:result];
dispatch_async(dispatch_get_main_queue(), ^{
[self.fetchedAssets addObject:assetWrapper];
});
}];
});
[self.tableView performSelector:#selector(reloadData) withObject:nil afterDelay:0.5];
}
How I load and call the button:
- (void)viewDidLoad
{
self.navigationItem.title = #"Loading";
UIBarButtonItem *shareButton = [[UIBarButtonItem alloc]
initWithBarButtonSystemItem:UIBarButtonSystemItemAction
target:self
action:#selector(shareAction:)];
self.navigationItem.rightBarButtonItem = shareButton;
self.navigationItem.rightBarButtonItem.enabled = NO;
// TableView configuration.
self.tableView.contentInset = TABLEVIEW_INSETS;
self.tableView.separatorColor = [UIColor clearColor];
self.tableView.allowsSelection = NO;
// Fetch the assets.
[self fetchAssets];
}
Should and did select fetched assets
#pragma mark - WSAssetsTableViewCellDelegate Methods
- (BOOL)assetsTableViewCell:(WSAssetsTableViewCell *)cell shouldSelectAssetAtColumn:(NSUInteger)column
{
BOOL shouldSelectAsset = (self.assetPickerState.selectionLimit == 0 ||
(self.assetPickerState.selectedCount < self.assetPickerState.selectionLimit));
NSIndexPath *indexPath = [self.tableView indexPathForCell:cell];
NSUInteger assetIndex = indexPath.row * self.assetsPerRow + column;
WSAssetWrapper *assetWrapper = [self.fetchedAssets objectAtIndex:assetIndex];
if ((shouldSelectAsset == NO) && (assetWrapper.isSelected == NO))
self.assetPickerState.state = WSAssetPickerStateSelectionLimitReached;
else
self.assetPickerState.state = WSAssetPickerStatePickingAssets;
return shouldSelectAsset;
}
- (void)assetsTableViewCell:(WSAssetsTableViewCell *)cell didSelectAsset:(BOOL)selected atColumn:(NSUInteger)column
{
NSIndexPath *indexPath = [self.tableView indexPathForCell:cell];
// Calculate the index of the corresponding asset.
NSUInteger assetIndex = indexPath.row * self.assetsPerRow + column;
WSAssetWrapper *assetWrapper = [self.fetchedAssets objectAtIndex:assetIndex];
assetWrapper.selected = selected;
// Update the state object's selectedAssets.
[self.assetPickerState changeSelectionState:selected forAsset:assetWrapper.asset];
// Update navigation bar with selected count and limit variables
dispatch_async(dispatch_get_main_queue(), ^{
if (self.assetPickerState.selectionLimit) {
self.navigationItem.title = [NSString stringWithFormat:#"%# (%lu/%ld)", [self.assetsGroup valueForProperty:ALAssetsGroupPropertyName], (unsigned long)self.assetPickerState.selectedCount, (long)self.assetPickerState.selectionLimit];
}
});
if (self.assetPickerState.selectedCount == 0) {
self.navigationItem.rightBarButtonItem.enabled = NO;
}
else {
self.navigationItem.rightBarButtonItem.enabled = YES;
}
}
Work needed to below with example from the download code I have used before.
-(void)shareAction:(id)sender {
//Launch UIDocumentInteractionController for selected images
documentController =[[UIDocumentInteractionController alloc]init];
documentController = [UIDocumentInteractionController interactionControllerWithURL:[NSURL fileURLWithPath://Code needed here??//]];
documentController.delegate=self;
[documentController presentOpenInMenuFromRect:CGRectZero inView:self.view animated:YES];
}
What would be the best practice to do this?
Thanks.
UPDATE 8/4:
-(void)shareAction:(id)sender {
//Launch UIDocumentInteractionController for selected images
if (self.assetPickerState.selectedCount >= 1) {
documentController = [[UIDocumentInteractionController alloc] init];
documentController = [UIDocumentInteractionController interactionControllerWithURL:[NSURL fileURLWithPath:#"public.image"]];
[documentController setDelegate:self];
[documentController presentOptionsMenuFromRect:CGRectZero inView:self.view animated:YES];
}
}
Returns: Unable to get data for URL: The operation couldn’t be completed. (Cocoa error 260.)

Answer 1

Your interactionControllerWithURL: doesn't seem to be a problem but I have observed that -presentOpenInMenuFromRect: does not show if there are no apps that can open the file.
If your purpose is to share the file, and generally that doesn't mean open the file in the conventional sense, then instead of:
-presentOpenInMenuFromRect:inView:animated:
use
-presentOptionsMenuFromRect:inView:animated:
The former is an OpenInMenu and latter is an OptionsMenu.
For the tiny difference, check my related answer or check Apple doc directly
Example:
//this seems fine
documentController = [UIDocumentInteractionController interactionControllerWithURL:[NSURL fileURLWithPath:path]];
//do this
[documentController presentOptionsMenuFromRect:CGRectZero
inView:self.view
animated:YES];
Also..., just before you present the documentInteractionController, it's good practice to specify the file's UTI so the documentInteractionController can populate itself with the appropriate options that can be performed & the list of all apps that can handle this file:
Example:
//assuming the file is a PDF
[documentController setUTI:#"com.adobe.pdf"];
//or... same thing but a more standardized way would be
[documentController setUTI:(NSString *)kUTTypePDF];
//but for this second style you'll need to add the `MobileCoreServices` framework
//to your project bundle and specify the following in your .h or .m
//#import <MobileCoreServices/MobileCoreServices.h>
Extra: Apple's Uniform Type Identifiers Reference