Some handy snippets for the iCloud chapter

pg76.m

#pragma mark - iCloud

- (BOOL)hasiCloud
{
    BOOL hasiCloud = ([self ubiquitousDocumentsURL] != nil);
    return hasiCloud;
}

- (void)setUseiCloud:(BOOL)value
{
    if (_useiCloud != value)
    {
        _useiCloud = value;
        [[NSUserDefaults standardUserDefaults] setBool:_useiCloud forKey:kUseiCloud];
        
        dispatch_queue_t defaultQ;
        defaultQ = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
        NSURL *baseURL = (_useiCloud ? [self ubiquitousDocumentsURL] : [self localDocumentsURL]);
        for (NSURL *url in [self.documentURLs copy])
        {
            dispatch_async(defaultQ, ^{
                NSURL *destinationURL = [baseURL URLByAppendingPathComponent:[url lastPathComponent]];
                NSFileManager *fileManager = [[NSFileManager alloc] init];
                NSError *error = nil;
                BOOL success = [fileManager setUbiquitous:_useiCloud
                                                itemAtURL:url
                                           destinationURL:destinationURL
                                                    error:&error];
                if (!success)
                {
                    NSLog (@"%@ unable to save from %@ to %@", self, url, destinationURL);
                }
                else
                {
                    NSLog (@"%@ successful save from %@ to %@", self, url, destinationURL);
                    [self addDocumentURL:destinationURL];
                }
            });
        }
        [self clearOutAndRefreshDocumentURLs];
    }
}

pg79.m

-(UIView *)cloudToolbarView
{
    UIView *cloudView = [[UIView alloc] initWithFrame:CGRectMake(0.0, 0.0, 160.0, 33.0)];
    UILabel *cloudLabel = [[UILabel alloc] initWithFrame:CGRectMake(0.0, 3.0, 80.0, 27.0)];
    
    cloudLabel.text = NSLocalizedString(@"Use iCloud", @"Use iCloud");
    cloudLabel.font = [UIFont boldSystemFontOfSize:[UIFont systemFontSize]];
    cloudLabel.textColor = [UIColor whiteColor];
    cloudLabel.backgroundColor = [UIColor clearColor];
    cloudLabel.shadowColor = [UIColor colorWithWhite:0.0 alpha:0.5];
    [cloudView addSubview:cloudLabel];
    UISwitch *cloudSwitch = [[UISwitch alloc] initWithFrame:CGRectMake(81.0, 3.0, 79.0, 27.0)];
    cloudSwitch.enabled = [[BNRDocumentStorage sharedDocumentStorage] hasICloud];
    cloudSwitch.on = [[BNRDocumentStorage sharedDocumentStorage] useiCloud];
    [cloudSwitch addTarget:self 
                    action:@selector(changeiCloud:) 
          forControlEvents:UIControlEventValueChanged];
    [self setCloudSwitch:cloudSwitch];
    [cloudView addSubview:cloudSwitch];
    return cloudView;
}

-(void)awakeFromNib
{
    self.navigationItem.leftBarButtonItem = self.editButtonItem;
    UIBarButtonItem *item1 = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:NULL];
    UIBarButtonItem *item2 = [[UIBarButtonItem alloc] initWithCustomView:[self cloudToolbarView]];
    UIBarButtonItem *item3 = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:NULL];
    
    self.toolbarItems = [NSArray arrayWithObjects:item1, item2, item3, nil];
}