AVMovieExporter/AssetViewController.m

/*
     File: AssetViewController.m
 Abstract: Table view controller that manages displaying a single asset. Shows movie, track and metadata information. Allows the metadata to be edited, and the movie to be exported. Also displays export preset options.
  Version: 1.0
 
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#import "AssetItem.h"
#import "AssetViewController.h"
#import "TrackViewController.h"
#import "MetadataViewController.h"
#import "NewMetadataViewController.h"
#import "ExportProgressViewController.h"
#import "PresetViewController.h"
 
enum AssetSections {
    movieSection,
    trackSection,
    metadataSection,
    settingsSection,
    metadataReplaceSection,
    exportSection
};
 
@implementation AssetViewController
 
@synthesize assetItem = _assetItem;
 
 
#pragma mark - UIViewController
 
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return YES;
}
 
- (void)viewDidLoad
{
    self.title = @"Movie";
    self.navigationItem.rightBarButtonItem = [self editButtonItem];
    
    __unsafe_unretained __block AssetViewController *weakSelf = (AssetViewController *)self;
    [self.assetItem loadMetadataWithCompletionHandler:^{
        [weakSelf.tableView reloadData];
    }];
    
    [self.assetItem loadTracksWithCompletionHandler:^{
        [weakSelf.tableView reloadData];
    }];
    
    [super viewDidLoad];
}
 
- (void)viewDidAppear:(BOOL)animated
{
    [self.tableView reloadRowsAtIndexPaths:[NSArray arrayWithObject:[NSIndexPath indexPathForRow:0 inSection:settingsSection]] 
                          withRowAnimation:UITableViewRowAnimationAutomatic];
}
 
#pragma mark - UITableViewDelegate
 
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSInteger row = indexPath.row;
    NSInteger section = indexPath.section;
    
    // If the track is selected, show information about the track
    if (section == trackSection && self.assetItem.tracks.count > 0)
    {
        AVAssetTrack *track = [self.assetItem.tracks objectAtIndex:row];
        TrackViewController *trackViewController = [[TrackViewController alloc] initWithStyle:UITableViewStyleGrouped];
        trackViewController.assetTrack = track;
        [self.navigationController pushViewController:trackViewController animated:YES];
    }
    // If the metadata is selected then show information about that metadata
    else if(section == metadataSection && self.assetItem.metadata.count > 0)
    {
        AVMetadataItem *metadataItem = [self.assetItem.metadata objectAtIndex:row];
        MetadataViewController *metadataViewController = [[MetadataViewController alloc] initWithStyle:UITableViewStyleGrouped];
        metadataViewController.metadataItem = metadataItem;
        [self.navigationController pushViewController:metadataViewController animated:YES];
    }
    else if (section == settingsSection && row == 0)
    {
        PresetViewController *presetViewController = [[PresetViewController alloc] initWithStyle:UITableViewStyleGrouped];
        presetViewController.assetItem = self.assetItem;
        [self.navigationController pushViewController:presetViewController animated:YES];
    }
    else if (section == metadataReplaceSection)
    {
        // Set the new metadata keys and values through a modal popup. Insert the items when the modal is dismissed.
        NewMetadataViewController *newMetadataViewController = [[NewMetadataViewController alloc] initWithNibName:nil bundle:nil];
        newMetadataViewController.delegate = self;
        
        UINavigationController *controller = [[UINavigationController alloc] initWithRootViewController:newMetadataViewController];
        controller.modalPresentationStyle = UIModalPresentationFormSheet;
        [self.navigationController presentModalViewController:controller animated:YES];
    }
    // Use the last section to start exporting
    else if(section == exportSection)
    {
        ExportProgressViewController *progressViewController = [[ExportProgressViewController alloc] initWithNibName:@"ExportView" bundle:nil];
        progressViewController.assetItem = self.assetItem;
        UINavigationController *controller = [[UINavigationController alloc] initWithRootViewController:progressViewController];
        controller.modalPresentationStyle = UIModalPresentationFormSheet;
        [self.navigationController presentModalViewController:controller animated:YES];
        
        [self.assetItem exportAssetWithCompletionHandler:^(NSError *error){
            dispatch_async(dispatch_get_main_queue(), ^{
                if (error != nil)
                {
                    UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:[error localizedDescription]
                                                                        message:[error localizedFailureReason] delegate:self
                                                              cancelButtonTitle:@"Cancel" otherButtonTitles:nil];
                    [alertView show];
                }
            });
        }];
        
        NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:exportSection];
        UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
        cell.selectionStyle = UITableViewCellSelectionStyleNone;
    }
}
 
- (UITableViewCellEditingStyle)tableView:(UITableView *)tableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return UITableViewCellEditingStyleDelete;
}
 
#pragma mark - UITableViewDataSource
 
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 6;
}
 
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    NSInteger numRows = 0;
    if (section == movieSection || section == exportSection || section == metadataReplaceSection)
        numRows = 1;
    else if (section == settingsSection)
        numRows = 2;
    else if (section == trackSection)
        numRows = self.assetItem.tracks.count;
    else if (section == metadataSection)
        numRows = self.assetItem.metadata.count;
    
    return numRows;
}
 
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{   
    NSString *title = nil;
    
    if (section == movieSection)
        title = @"Movie";
    else if (section == trackSection)
        title = @"Tracks";
    else if (section == metadataSection)
        title = @"Metadata";
    else if (section == settingsSection)
        title = @"Settings";
    else if (section == exportSection || section == metadataReplaceSection)
        title = @"";
    
    return title;
}
 
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *BoolCellIdentifier = @"BoolCell";
    static NSString *OtherCellIdentifier = @"OtherCell";
    NSInteger section = indexPath.section;
    NSInteger row = indexPath.row;
    BOOL indexPathIsForBoolSetting = section == settingsSection && row == 1;
    NSString *cellID = indexPathIsForBoolSetting ? BoolCellIdentifier : OtherCellIdentifier;
    
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellID];
    if (cell == nil) 
    {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellID];
        
        // Add a UISwitch for the shouldOptimizeForNetworkUsage option
        if (indexPathIsForBoolSetting) 
        {
            cell.selectionStyle = UITableViewCellSelectionStyleNone;
            UISwitch *toggleSwitch = [[UISwitch alloc] initWithFrame:CGRectZero];
            toggleSwitch.backgroundColor = [UIColor whiteColor];
            toggleSwitch.opaque = YES;
            toggleSwitch.on = self.assetItem.exportSession.shouldOptimizeForNetworkUse;
            [toggleSwitch addTarget:self action:@selector(updateFromSwitch:) forControlEvents:UIControlEventValueChanged];
            cell.accessoryView = toggleSwitch;
        }
        else
        {
            cell.accessoryType = UITableViewCellAccessoryNone;
            cell.textLabel.textAlignment = UITextAlignmentLeft;
            cell.selectionStyle = UITableViewCellSelectionStyleBlue;
        }
    }
    
    cell.textLabel.lineBreakMode = UILineBreakModeHeadTruncation;
    cell.imageView.image = nil;
    
    if (section == movieSection)
    {
        __unsafe_unretained __block AssetViewController *weakSelf = (AssetViewController *)self;
        cell.textLabel.text = [self.assetItem loadTitleWithCompletionHandler:^{
            UITableViewCell *thumbnailCell = [tableView cellForRowAtIndexPath:indexPath];
            thumbnailCell.textLabel.text = weakSelf.assetItem.title;
            [thumbnailCell setNeedsLayout];
        }];
        
        cell.selectionStyle = UITableViewCellSelectionStyleNone;
        cell.accessoryType = UITableViewCellAccessoryNone;
    }
    else if (section == trackSection)
    {
        cell.textLabel.text = [self.assetItem trackLabelAtIndex:row];
        cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
    }
    else if (section == metadataSection)
    {
        cell.textLabel.text = [self.assetItem metadataLabelAtIndex:row];
        cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
        cell.textLabel.textAlignment = UITextAlignmentLeft;
    }
    else if (section == settingsSection)
    {
        if (row == 0)
        {
            cell.textLabel.text = NSLocalizedString([self.assetItem preset], nil);
            cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
        }
        else if (row == 1)
        {
            cell.textLabel.text = @"Optimize For Network Use";
            cell.textLabel.adjustsFontSizeToFitWidth = YES;
        }
    }
    else if (section == metadataReplaceSection)
    {
        cell.textLabel.text = @"Replace Metadata";
        cell.textLabel.textAlignment = UITextAlignmentCenter;
        cell.accessoryType = UITableViewCellAccessoryNone;
        cell.selectionStyle = UITableViewCellSelectionStyleNone;
    }
    else if (section == exportSection)
    {
        cell.textLabel.text = @"Export";
        cell.textLabel.textAlignment = UITextAlignmentCenter;
        cell.accessoryType = UITableViewCellAccessoryNone;
    }
    
    return cell;
}
 
// Only allow deleting/insertion of metadata when editing
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
{
    return indexPath.section == metadataSection;
}
 
// When editing is finished, either delete or insert new metadata items
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSArray *indexPaths = [NSArray arrayWithObject:indexPath];
    
    // Delete metadata from the assetItem and the table view
    if (editingStyle == UITableViewCellEditingStyleDelete)
    {
        [self.assetItem.metadata removeObjectAtIndex:indexPath.row];
        [[self tableView] deleteRowsAtIndexPaths:indexPaths withRowAnimation:UITableViewRowAnimationAutomatic];
    }
}
 
#pragma mark - Callbacks
 
// Respond to UISwitch changes
- (void)updateFromSwitch:(id)sender
{
    UISwitch *toggleSwitch = (UISwitch *)sender;
    self.assetItem.exportSession.shouldOptimizeForNetworkUse = toggleSwitch.on;
}
 
#pragma mark - NewMetadataProtocol
 
- (void)finishedCreatingMetadataItem:(NSArray *)newMetadataItems
{
    [self.tableView beginUpdates];
    
    [self.tableView deleteSections:[NSIndexSet indexSetWithIndex:metadataSection] withRowAnimation:UITableViewRowAnimationAutomatic];
    self.assetItem.metadata = [newMetadataItems mutableCopy];
    [self.tableView insertSections:[NSIndexSet indexSetWithIndex:metadataSection] withRowAnimation:UITableViewRowAnimationAutomatic];
                            
    [self.tableView endUpdates];
    
    [self dismissModalViewControllerAnimated:YES];
}
 
@end


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