Classes/DITableViewController.m

/* 
     File: DITableViewController.m
 Abstract: The table view that display docs of different types.
  Version: 1.6
 
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 */
 
#import "DITableViewController.h"
 
static NSString* documents[] =
{   @"Text Document.txt",
    @"Image Document.jpg",
    @"PDF Document.pdf",
    @"HTML Document.html"
};
 
#define NUM_DOCS 4
#define kRowHeight 58.0f
 
#pragma mark -
 
@interface DITableViewController () <QLPreviewControllerDataSource,
QLPreviewControllerDelegate,
DirectoryWatcherDelegate,
UIDocumentInteractionControllerDelegate>
 
@property (nonatomic, strong) DirectoryWatcher *docWatcher;
@property (nonatomic, strong) NSMutableArray *documentURLs;
@property (nonatomic, strong) UIDocumentInteractionController *docInteractionController;
 
@end
 
#pragma mark -
 
@implementation DITableViewController
 
- (void)setupDocumentControllerWithURL:(NSURL *)url
{
    //checks if docInteractionController has been initialized with the URL
    if (self.docInteractionController == nil)
    {
        self.docInteractionController = [UIDocumentInteractionController interactionControllerWithURL:url];
        self.docInteractionController.delegate = self;
    }
    else
    {
        self.docInteractionController.URL = url;
    }
}
 
- (void)viewDidLoad
{
    [super viewDidLoad];
    
    // start monitoring the document directory…
    self.docWatcher = [DirectoryWatcher watchFolderWithPath:[self applicationDocumentsDirectory] delegate:self];
    
    self.documentURLs = [NSMutableArray array];
    
    // scan for existing documents
    [self directoryDidChange:self.docWatcher];
}
 
- (void)viewDidUnload
{
    self.documentURLs = nil;
    self.docWatcher = nil;
}
 
// if we installed a custom UIGestureRecognizer (i.e. long-hold), then this would be called
//
- (void)handleLongPress:(UILongPressGestureRecognizer *)longPressGesture
{
    if (longPressGesture.state == UIGestureRecognizerStateBegan)
    {
        NSIndexPath *cellIndexPath = [self.tableView indexPathForRowAtPoint:[longPressGesture locationInView:self.tableView]];
        
        NSURL *fileURL;
        if (cellIndexPath.section == 0)
        {
            // for section 0, we preview the docs built into our app
            fileURL = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:documents[cellIndexPath.row] ofType:nil]];
        }
        else
        {
            // for secton 1, we preview the docs found in the Documents folder
            fileURL = [self.documentURLs objectAtIndex:cellIndexPath.row];
        }
        self.docInteractionController.URL = fileURL;
        
        [self.docInteractionController presentOptionsMenuFromRect:longPressGesture.view.frame
                                                           inView:longPressGesture.view
                                                         animated:YES];
    }
}
 
 
#pragma mark - UITableViewDataSource
 
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 2;
}
 
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    // Initializing each section with a set of rows
    if (section == 0)
    {
        return NUM_DOCS;
    }
    else
    {
        return self.documentURLs.count;
    }
}
 
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
    NSString *title = nil;
    // setting headers for each section
    if (section == 0)
    {
        title = @"Example Documents";
    }
    else
    {
        if (self.documentURLs.count > 0)
            title = @"Documents folder";
    }
    
    return title;
}
 
- (UITableViewCell *)tableView:(UITableView*)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *cellIdentifier = @"cellID";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
    
    if (!cell)
    {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:cellIdentifier];
        cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
    }
    
    NSURL *fileURL;
    if (indexPath.section == 0)
    {
        // first section is our build-in documents
        fileURL = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:documents[indexPath.row] ofType:nil]];
    }
    else
    {
        // second section is the contents of the Documents folder
        fileURL = [self.documentURLs objectAtIndex:indexPath.row];
    }
    [self setupDocumentControllerWithURL:fileURL];
    
    // layout the cell
    cell.textLabel.text = [[fileURL path] lastPathComponent];
    NSInteger iconCount = [self.docInteractionController.icons count];
    if (iconCount > 0)
    {
        cell.imageView.image = [self.docInteractionController.icons objectAtIndex:iconCount - 1];
    }
    
    NSString *fileURLString = [self.docInteractionController.URL path];
    NSDictionary *fileAttributes = [[NSFileManager defaultManager] attributesOfItemAtPath:fileURLString error:nil];
    NSInteger fileSize = [[fileAttributes objectForKey:NSFileSize] intValue];
    NSString *fileSizeStr = [NSByteCountFormatter stringFromByteCount:fileSize
                                                           countStyle:NSByteCountFormatterCountStyleFile];
    cell.detailTextLabel.text = [NSString stringWithFormat:@"%@ - %@", fileSizeStr, self.docInteractionController.UTI];
    
    // attach to our view any gesture recognizers that the UIDocumentInteractionController provides
    //cell.imageView.userInteractionEnabled = YES;
    //cell.contentView.gestureRecognizers = self.docInteractionController.gestureRecognizers;
    //
    // or
    // add a custom gesture recognizer in lieu of using the canned ones
    //
    UILongPressGestureRecognizer *longPressGesture =
    [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleLongPress:)];
    [cell.imageView addGestureRecognizer:longPressGesture];
    cell.imageView.userInteractionEnabled = YES;    // this is by default NO, so we need to turn it on
    
    return cell;
}
 
- (CGFloat)tableView:(UITableView*)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return kRowHeight;
}
 
 
#pragma mark - UITableViewDelegate
 
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    // three ways to present a preview:
    // 1. Don't implement this method and simply attach the canned gestureRecognizers to the cell
    //
    // 2. Don't use canned gesture recognizers and simply use UIDocumentInteractionController's
    //      presentPreviewAnimated: to get a preview for the document associated with this cell
    //
    // 3. Use the QLPreviewController to give the user preview access to the document associated
    //      with this cell and all the other documents as well.
    
    // for case 2 use this, allowing UIDocumentInteractionController to handle the preview:
    /*
     NSURL *fileURL;
     if (indexPath.section == 0)
     {
     fileURL = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:documents[indexPath.row] ofType:nil]];
     }
     else
     {
     fileURL = [self.documentURLs objectAtIndex:indexPath.row];
     }
     [self setupDocumentControllerWithURL:fileURL];
     [self.docInteractionController presentPreviewAnimated:YES];
     */
    
    // for case 3 we use the QuickLook APIs directly to preview the document -
    QLPreviewController *previewController = [[QLPreviewController alloc] init];
    previewController.dataSource = self;
    previewController.delegate = self;
    
    // start previewing the document at the current section index
    previewController.currentPreviewItemIndex = indexPath.row;
    [[self navigationController] pushViewController:previewController animated:YES];
}
 
 
#pragma mark - UIDocumentInteractionControllerDelegate
 
- (UIViewController *)documentInteractionControllerViewControllerForPreview:(UIDocumentInteractionController *)interactionController
{
    return self;
}
 
 
#pragma mark - QLPreviewControllerDataSource
 
// Returns the number of items that the preview controller should preview
- (NSInteger)numberOfPreviewItemsInPreviewController:(QLPreviewController *)previewController
{
    NSInteger numToPreview = 0;
    
    NSIndexPath *selectedIndexPath = [self.tableView indexPathForSelectedRow];
    if (selectedIndexPath.section == 0)
        numToPreview = NUM_DOCS;
    else
        numToPreview = self.documentURLs.count;
    
    return numToPreview;
}
 
- (void)previewControllerDidDismiss:(QLPreviewController *)controller
{
    // if the preview dismissed (done button touched), use this method to post-process previews
}
 
// returns the item that the preview controller should preview
- (id)previewController:(QLPreviewController *)previewController previewItemAtIndex:(NSInteger)idx
{
    NSURL *fileURL = nil;
    
    NSIndexPath *selectedIndexPath = [self.tableView indexPathForSelectedRow];
    if (selectedIndexPath.section == 0)
    {
        fileURL = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:documents[idx] ofType:nil]];
    }
    else
    {
        fileURL = [self.documentURLs objectAtIndex:idx];
    }
    
    return fileURL;
}
 
 
#pragma mark - File system support
 
- (NSString *)applicationDocumentsDirectory
{
    return [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
}
 
- (void)directoryDidChange:(DirectoryWatcher *)folderWatcher
{
    [self.documentURLs removeAllObjects];    // clear out the old docs and start over
    
    NSString *documentsDirectoryPath = [self applicationDocumentsDirectory];
    
    NSArray *documentsDirectoryContents = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:documentsDirectoryPath
                                                                                              error:NULL];
    
    for (NSString* curFileName in [documentsDirectoryContents objectEnumerator])
    {
        NSString *filePath = [documentsDirectoryPath stringByAppendingPathComponent:curFileName];
        NSURL *fileURL = [NSURL fileURLWithPath:filePath];
        
        BOOL isDirectory;
        [[NSFileManager defaultManager] fileExistsAtPath:filePath isDirectory:&isDirectory];
        
        // proceed to add the document URL to our list (ignore the "Inbox" folder)
        if (!(isDirectory && [curFileName isEqualToString:@"Inbox"]))
        {
            [self.documentURLs addObject:fileURL];
        }
    }
    
    [self.tableView reloadData];
}
 
@end


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