如何显示NSDocument目录中的所有图像

Question

First i selected images from photo library to ALAsset Library and after that i stored images in document directory from ALAsset library path.

i am using this code to store images in document directory from ALAsset Library.... Its working perfect... Now i want to display all images which are stored in document directory in table view.. how can i do this??? can anybody help me??

Code for importing images from ALAsset Library to NSdocument directory

for (int j=0; j<[assetArray count]; j++) {

ALAssetRepresentation *representation = [[assetArray objectAtIndex:j] defaultRepresentation];
NSString* filename = [documentPath stringByAppendingPathComponent:[representation filename]];

[[NSFileManager defaultManager] createFileAtPath:filename contents:nil attributes:nil];
NSOutputStream *outPutStream = [NSOutputStream outputStreamToFileAtPath:filename append:YES];
[outPutStream open];

long long offset = 0;
long long bytesRead = 0;

NSError *error;
uint8_t * buffer = malloc(131072);
while (offset<[representation size] && [outPutStream hasSpaceAvailable]) {
    bytesRead = [representation getBytes:buffer fromOffset:offset length:131072 error:&error];
    [outPutStream write:buffer maxLength:bytesRead];
    offset = offset+bytesRead;
}
[outPutStream close];
free(buffer);

}

After that i got the contents of directory using this code:

 NSFileManager *manager = [NSFileManager defaultManager];
fileList = [manager directoryContentsAtPath:newDir];

Its also working... but now when i want to display images from document directory. It doesn't show anything....

 setImage.image=[UIImage imageNamed:[filePathsArray objectAtIndex:0]];

Can anybody help, where is the problem????? - I have one doubt: *Is it the right way to import images from ALAsset Library to document directory???

Answer 1

This answer is about how to retrieve images from documents directory and displaying them to UITableView... ..

first of all you have to get all images from your documents directory to an array....

-(void)viewWillAppear:(BOOL)animated
{

    arrayOfImages = [[NSMutableArray alloc]init];
NSError *error = nil;


    NSString *stringPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)objectAtIndex:0];

    NSArray *filePathsArray = [[NSFileManager defaultManager] subpathsOfDirectoryAtPath: stringPath  error:&error];

  for(int i=0;i<[filePathsArray count];i++)
  {
      NSString *strFilePath = [filePathsArray objectAtIndex:i];
      if ([[strFilePath pathExtension] isEqualToString:@"jpg"] || [[strFilePath pathExtension] isEqualToString:@"png"] || [[strFilePath pathExtension] isEqualToString:@"PNG"]) 
      {
         NSString *imagePath = [[stringPath stringByAppendingString:@"/"] stringByAppendingString:strFilePath];
         NSData *data = [NSData dataWithContentsOfFile:imagePath];
        if(data)
        {
          UIImage *image = [UIImage imageWithData:data];
          [arrayOfImages addObject:image];
        }
      }

  }

}

after that - using this array you can show the image in uitableview cell remember dont add the table view on your view untill your array is fill.....

#pragma mark - UItableViewDelegate methods
-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 1;
}

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return [arrayOfImages count];
}

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{

    static NSString *CellIdentifier = @"Cell";
    UITableViewCell *cell = [tablView dequeueReusableCellWithIdentifier:CellIdentifier];
    if(cell == nil)
    {
        cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    }
    //adjust your imageview frame according to you
    UIImageView *imageView = [[UIImageView alloc]initWithFrame:CGRectMake(0.0, 0.0, 470.0, 80.0)];

    [imageView setImage:[arrayOfImages objectAtIndex:indexPath.row]];
    [cell.contentView addSubview:imageView];
    return cell;

}

Now run it will work ..

Answer 2

You can directly get contents by this :

NSArray *directoryContent = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)lastObject] error:NULL];

To set Image :

[imgView setImage:[UIImage imageWithContentsOfFile:"Your complete path"]];

Answer 3

You can get all the image files from the Document Directory this way:

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];

    NSArray *filePathsArray = [[NSFileManager defaultManager] subpathsOfDirectoryAtPath:documentsDirectory  error:nil];
    NSMutableArray *imgFiles = [[NSMutableArray alloc] init];
    for (int i=0; i<filePathsArray.count; i++) {
        NSString *strFilePath = [filePathsArray objectAtIndex:0];
        if ([[strFilePath pathExtension] isEqualToString:@"jpg"]) {
            [imgFiles addObject:[filePathsArray objectAtIndex:i]];
        }
    }

    NSLog(@"array with paths of image files in the Document Directory %@", filePathsArray);

And then you can display the images into the UITableView like this:

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
    }
    UIImageView *img = [[UIImageView alloc] initWithFrame:CGRectMake(5, 5, 50, 50)];
    img.image = [UIImage imageWithContentsOfFile:[imgFiles objectAtIndex:indexPath.row]];
    [cell addSubview:img];

    return cell;
}

Cheers!!!