如何显示 NSDocument 目录中的所有图像 [英] How to display all images from NSDocument directory

问题描述

首先我从照片库中选择图像到 ALAsset 库，然后我将图像从 ALAsset 库路径存储在文档目录中.

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

我正在使用此代码将图像存储在 ALAsset 库中的文档目录中......它的工作完美......现在我想在表格视图中显示存储在文档目录中的所有图像......我该怎么做???谁能帮帮我??

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??

将图像从 ALAsset 库导入到 NSdocument 目录的代码

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);

}

之后我使用此代码获取目录的内容:

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

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

它也可以工作...但是现在当我想显示文档目录中的图像时.它没有显示任何东西......

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]];

谁能帮忙，问题出在哪里??????- 我有一个疑问:*将图像从ALAsset库导入到文档目录是否正确???

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???

推荐答案

这个答案是关于如何从文档目录中检索图像并将它们显示到 UITableView.....

首先，您必须将文档目录中的所有图像保存到一个数组中......

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];
        }
      }

  }

}

之后 - 使用此数组，您可以在 uitableview 单元格中显示图像记住不要在你的视图上添加表格视图，直到你的数组被填满.....

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;

}

现在运行它会工作..

这篇关于如何显示 NSDocument 目录中的所有图像的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！