Question

I’m making a note taking app for the iPad, and it lets the user draw lines, and right now, it can save the pages of the notebook by saving each page as a PNG in the documents directory. Here’s the code I have to save the images:

- (IBAction)saveImage:(id)sender {

UIImage *saveImage = drawImage.image;

if (saveImage != nil)
  {
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
                                                         NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString* path = [documentsDirectory stringByAppendingPathComponent:
                      [NSString stringWithFormat: @"%@-%d.png", @"image", numberOfPages] ];
    NSData* data = UIImagePNGRepresentation(saveImage);
    [data writeToFile:path atomically:YES];
  }

}

Just as a side note, numberOfPages is an int that is set to add 1 each time a “new page” button is pressed, this way, each image is named “image1”, “image2”, etc.

So my question is: How would I set up a UITable so the user can see a list of all the pages they’ve made.

Thanks so much for your time,

Karl

Answer 1

Each time you make a new page, add a string with the image’s name to an array. Then, iterate through the array to populate a UITableView. When the user selects a cell, open the file with that name.

#import "RootViewController.h"

@implementation RootViewController
@synthesize keys, names;
AppDelegate *appD;

- (void)viewDidLoad
{
    [super viewDidLoad];
    appD = (AppDelegate *)[[UIApplication sharedApplication] delegate]; 
    names = appD.data;
    NSArray *array = [[names allKeys] sortedArrayUsingSelector:@selector(compare:)];
    keys = array;
}

- (NSInteger) numberOfSectionsInTableView:(UITableView *)tableView
{
    return [keys count];
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section 
{
    NSString *key = [keys objectAtIndex:section];
    NSArray *nameSection = [names objectForKey:key];
    return [nameSection count];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 
{
    NSUInteger section = indexPath.section;
    NSUInteger row = indexPath.row;

    NSString *key = [keys objectAtIndex:section];
    NSArray *nameSection = [appD.data objectForKey:key];

    static NSString *SectionsTableIdentifier = @"SectionsTableIdentifier";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:SectionsTableIdentifier];
    if (cell == nil) 
    {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:SectionsTableIdentifier];
    }
    cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
    cell.textLabel.text = [nameSection objectAtIndex:row];
    return cell;
}

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
    NSString *key = [keys objectAtIndex:section];
    key = [key substringFromIndex:2];
    return key;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSUInteger section = indexPath.section;
    NSUInteger row = indexPath.row;

    NSString *key = [keys objectAtIndex:section];
    NSArray *nameSection = [appD.data objectForKey:key];

    appD.theInfo.primary = [nameSection objectAtIndex:row];

    [self performSegueWithIdentifier:@"secondarySegue" sender:self];
}

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return YES;
}

@end

This is for a table in a navigation controller that populates itself from a .plist and moves to another table when a cell is clicked. The tableview is connected to the view controller with delegate and datasource outlets.