Reusable wrapper for UIDocumentInteractionController's "Open In" menu

ADVFileSharer.h

//
//  Copyright © 2013 Yuri Kotov
//

#import <Foundation/Foundation.h>

@interface ADVFileSharer : NSObject

- (instancetype) initWithFileURL:(NSURL *)url;
- (BOOL) presentShareMenuFromBarButtonItem:(UIBarButtonItem *)item completion:(void(^)())completion;
- (void) dismissMenu;

@end

ADVFileSharer.m

//
//  Copyright © 2013 Yuri Kotov
//

#import "ADVFileSharer.h"

@interface ADVFileSharer () <UIDocumentInteractionControllerDelegate>
@property (strong, nonatomic) UIDocumentInteractionController *documentController;
@property (strong, nonatomic) void(^completion)();
@end

@implementation ADVFileSharer
{
    NSURL *_fileURL;
    BOOL _isSaving;
}

- (instancetype) initWithFileURL:(NSURL *)url
{
    if ((self = [super init]))
    {
        _fileURL = url;
    }
    return self;
}

- (BOOL) presentShareMenuFromBarButtonItem:(UIBarButtonItem *)item completion:(void(^)())completion
{
    self.documentController = [UIDocumentInteractionController interactionControllerWithURL:_fileURL];
    self.documentController.delegate = self;
    BOOL didShow = [self.documentController presentOpenInMenuFromBarButtonItem:item animated:YES];
    if (didShow)
    {
        __weak typeof(self) weakSelf = self;
        self.completion = ^{
            weakSelf.documentController.delegate = nil;
            weakSelf.documentController = nil;
            if (completion) completion();
        };
    }
    else
    {
        self.documentController = nil;
    }
    return didShow;
}

- (void) dismissMenu
{
    [self.documentController dismissMenuAnimated:YES];
}

#pragma mark - UIDocumentInteractionControllerDelegate
- (void) documentInteractionController:(UIDocumentInteractionController *)controller
         willBeginSendingToApplication:(NSString *)application
{
    // TODO: Replace with sharing progress indication
    [[UIApplication sharedApplication] beginIgnoringInteractionEvents];

    _isSaving = YES;
}

- (void) documentInteractionControllerDidDismissOpenInMenu:(UIDocumentInteractionController *)controller
{
    if (!_isSaving) self.completion();
}

- (void) documentInteractionController:(UIDocumentInteractionController *)controller
            didEndSendingToApplication:(NSString *)application
{
    _isSaving = NO;
    self.completion();

    // TODO: Replace with sharing progress indication
    [[UIApplication sharedApplication] endIgnoringInteractionEvents];
}

@end